using System.Text;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Nop.Core;
using Nop.Core.Domain.Catalog;
using Nop.Core.Domain.Customers;
using Nop.Core.Domain.Discounts;
using Nop.Core.Domain.Media;
using Nop.Core.Domain.Orders;
using Nop.Core.Domain.Vendors;
using Nop.Core.Http;
using Nop.Core.Infrastructure;
using Nop.Services.Catalog;
using Nop.Services.Common;
using Nop.Services.Configuration;
using Nop.Services.Customers;
using Nop.Services.Discounts;
using Nop.Services.ExportImport;
using Nop.Services.Localization;
using Nop.Services.Logging;
using Nop.Services.Media;
using Nop.Services.Messages;
using Nop.Services.Orders;
using Nop.Services.Security;
using Nop.Services.Seo;
using Nop.Services.Shipping;
using Nop.Web.Areas.Admin.Factories;
using Nop.Web.Areas.Admin.Infrastructure.Mapper.Extensions;
using Nop.Web.Areas.Admin.Models.Catalog;
using Nop.Web.Framework.Controllers;
using Nop.Web.Framework.Mvc;
using Nop.Web.Framework.Mvc.Filters;
using Nop.Web.Framework.Mvc.ModelBinding;
using Nop.Web.Framework.Validators;

namespace Nop.Web.Areas.Admin.Controllers;

public partial class ProductController : BaseAdminController
{
    #region Fields

    protected readonly IAclService _aclService;
    protected readonly IBackInStockSubscriptionService _backInStockSubscriptionService;
    protected readonly ICategoryService _categoryService;
    protected readonly ICopyProductService _copyProductService;
    protected readonly ICustomerActivityService _customerActivityService;
    protected readonly ICustomerService _customerService;
    protected readonly IDiscountService _discountService;
    protected readonly IDownloadService _downloadService;
    protected readonly IExportManager _exportManager;
    protected readonly IGenericAttributeService _genericAttributeService;
    protected readonly IHttpClientFactory _httpClientFactory;
    protected readonly IImportManager _importManager;
    protected readonly ILanguageService _languageService;
    protected readonly ILocalizationService _localizationService;
    protected readonly ILocalizedEntityService _localizedEntityService;
    protected readonly IManufacturerService _manufacturerService;
    protected readonly INopFileProvider _fileProvider;
    protected readonly INotificationService _notificationService;
    protected readonly IPdfService _pdfService;
    protected readonly IPermissionService _permissionService;
    protected readonly IPictureService _pictureService;
    protected readonly IProductAttributeFormatter _productAttributeFormatter;
    protected readonly IProductAttributeParser _productAttributeParser;
    protected readonly IProductAttributeService _productAttributeService;
    protected readonly IProductModelFactory _productModelFactory;
    protected readonly IProductService _productService;
    protected readonly IProductTagService _productTagService;
    protected readonly ISettingService _settingService;
    protected readonly IShippingService _shippingService;
    protected readonly IShoppingCartService _shoppingCartService;
    protected readonly ISpecificationAttributeService _specificationAttributeService;
    protected readonly IStoreContext _storeContext;
    protected readonly IUrlRecordService _urlRecordService;
    protected readonly IVideoService _videoService;
    protected readonly IWebHelper _webHelper;
    protected readonly IWorkContext _workContext;
    protected readonly VendorSettings _vendorSettings;
    private static readonly char[] _separator = [','];

    #endregion

    #region Ctor

    public ProductController(IAclService aclService,
        IBackInStockSubscriptionService backInStockSubscriptionService,
        ICategoryService categoryService,
        ICopyProductService copyProductService,
        ICustomerActivityService customerActivityService,
        ICustomerService customerService,
        IDiscountService discountService,
        IDownloadService downloadService,
        IExportManager exportManager,
        IGenericAttributeService genericAttributeService,
        IHttpClientFactory httpClientFactory,
        IImportManager importManager,
        ILanguageService languageService,
        ILocalizationService localizationService,
        ILocalizedEntityService localizedEntityService,
        IManufacturerService manufacturerService,
        INopFileProvider fileProvider,
        INotificationService notificationService,
        IPdfService pdfService,
        IPermissionService permissionService,
        IPictureService pictureService,
        IProductAttributeFormatter productAttributeFormatter,
        IProductAttributeParser productAttributeParser,
        IProductAttributeService productAttributeService,
        IProductModelFactory productModelFactory,
        IProductService productService,
        IProductTagService productTagService,
        ISettingService settingService,
        IShippingService shippingService,
        IShoppingCartService shoppingCartService,
        ISpecificationAttributeService specificationAttributeService,
        IStoreContext storeContext,
        IUrlRecordService urlRecordService,
        IVideoService videoService,
        IWebHelper webHelper,
        IWorkContext workContext,
        VendorSettings vendorSettings)
    {
        _aclService = aclService;
        _backInStockSubscriptionService = backInStockSubscriptionService;
        _categoryService = categoryService;
        _copyProductService = copyProductService;
        _customerActivityService = customerActivityService;
        _customerService = customerService;
        _discountService = discountService;
        _downloadService = downloadService;
        _exportManager = exportManager;
        _genericAttributeService = genericAttributeService;
        _httpClientFactory = httpClientFactory;
        _importManager = importManager;
        _languageService = languageService;
        _localizationService = localizationService;
        _localizedEntityService = localizedEntityService;
        _manufacturerService = manufacturerService;
        _fileProvider = fileProvider;
        _notificationService = notificationService;
        _pdfService = pdfService;
        _permissionService = permissionService;
        _pictureService = pictureService;
        _productAttributeFormatter = productAttributeFormatter;
        _productAttributeParser = productAttributeParser;
        _productAttributeService = productAttributeService;
        _productModelFactory = productModelFactory;
        _productService = productService;
        _productTagService = productTagService;
        _settingService = settingService;
        _shippingService = shippingService;
        _shoppingCartService = shoppingCartService;
        _specificationAttributeService = specificationAttributeService;
        _storeContext = storeContext;
        _urlRecordService = urlRecordService;
        _videoService = videoService;
        _webHelper = webHelper;
        _workContext = workContext;
        _vendorSettings = vendorSettings;
    }

    #endregion

    #region Utilities

    protected virtual async Task UpdateLocalesAsync(Product product, ProductModel model)
    {
        foreach (var localized in model.Locales)
        {
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.Name,
                localized.Name,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.ShortDescription,
                localized.ShortDescription,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.FullDescription,
                localized.FullDescription,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.MetaKeywords,
                localized.MetaKeywords,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.MetaDescription,
                localized.MetaDescription,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(product,
                x => x.MetaTitle,
                localized.MetaTitle,
                localized.LanguageId);

            //search engine name
            var seName = await _urlRecordService.ValidateSeNameAsync(product, localized.SeName, localized.Name, false);
            await _urlRecordService.SaveSlugAsync(product, seName, localized.LanguageId);
        }
    }

    protected virtual async Task UpdateLocalesAsync(ProductTag productTag, ProductTagModel model)
    {
        foreach (var localized in model.Locales)
        {
            await _localizedEntityService.SaveLocalizedValueAsync(productTag,
                x => x.Name,
                localized.Name,
                localized.LanguageId);

            var seName = await _urlRecordService.ValidateSeNameAsync(productTag, string.Empty, localized.Name, false);
            await _urlRecordService.SaveSlugAsync(productTag, seName, localized.LanguageId);
        }
    }

    protected virtual async Task UpdateLocalesAsync(ProductAttributeMapping pam, ProductAttributeMappingModel model)
    {
        foreach (var localized in model.Locales)
        {
            await _localizedEntityService.SaveLocalizedValueAsync(pam,
                x => x.TextPrompt,
                localized.TextPrompt,
                localized.LanguageId);
            await _localizedEntityService.SaveLocalizedValueAsync(pam,
                x => x.DefaultValue,
                localized.DefaultValue,
                localized.LanguageId);
        }
    }

    protected virtual async Task UpdateLocalesAsync(ProductAttributeValue pav, ProductAttributeValueModel model)
    {
        foreach (var localized in model.Locales)
        {
            await _localizedEntityService.SaveLocalizedValueAsync(pav,
                x => x.Name,
                localized.Name,
                localized.LanguageId);
        }
    }

    protected virtual async Task UpdatePictureSeoNamesAsync(Product product)
    {
        foreach (var pp in await _productService.GetProductPicturesByProductIdAsync(product.Id))
            await _pictureService.SetSeoFilenameAsync(pp.PictureId, await _pictureService.GetPictureSeNameAsync(product.Name));
    }
    
    protected virtual async Task SaveCategoryMappingsAsync(Product product, ProductModel model)
    {
        var existingProductCategories = await _categoryService.GetProductCategoriesByProductIdAsync(product.Id, true);

        //delete categories
        foreach (var existingProductCategory in existingProductCategories)
            if (!model.SelectedCategoryIds.Contains(existingProductCategory.CategoryId))
                await _categoryService.DeleteProductCategoryAsync(existingProductCategory);

        //add categories
        foreach (var categoryId in model.SelectedCategoryIds)
        {
            if (_categoryService.FindProductCategory(existingProductCategories, product.Id, categoryId) == null)
            {
                //find next display order
                var displayOrder = 1;
                var existingCategoryMapping = await _categoryService.GetProductCategoriesByCategoryIdAsync(categoryId, showHidden: true);
                if (existingCategoryMapping.Any())
                    displayOrder = existingCategoryMapping.Max(x => x.DisplayOrder) + 1;
                await _categoryService.InsertProductCategoryAsync(new ProductCategory
                {
                    ProductId = product.Id,
                    CategoryId = categoryId,
                    DisplayOrder = displayOrder
                });
            }
        }
    }

    protected virtual async Task SaveManufacturerMappingsAsync(Product product, ProductModel model)
    {
        var existingProductManufacturers = await _manufacturerService.GetProductManufacturersByProductIdAsync(product.Id, true);

        //delete manufacturers
        foreach (var existingProductManufacturer in existingProductManufacturers)
            if (!model.SelectedManufacturerIds.Contains(existingProductManufacturer.ManufacturerId))
                await _manufacturerService.DeleteProductManufacturerAsync(existingProductManufacturer);

        //add manufacturers
        foreach (var manufacturerId in model.SelectedManufacturerIds)
        {
            if (_manufacturerService.FindProductManufacturer(existingProductManufacturers, product.Id, manufacturerId) == null)
            {
                //find next display order
                var displayOrder = 1;
                var existingManufacturerMapping = await _manufacturerService.GetProductManufacturersByManufacturerIdAsync(manufacturerId, showHidden: true);
                if (existingManufacturerMapping.Any())
                    displayOrder = existingManufacturerMapping.Max(x => x.DisplayOrder) + 1;
                await _manufacturerService.InsertProductManufacturerAsync(new ProductManufacturer
                {
                    ProductId = product.Id,
                    ManufacturerId = manufacturerId,
                    DisplayOrder = displayOrder
                });
            }
        }
    }

    protected virtual async Task SaveDiscountMappingsAsync(Product product, ProductModel model)
    {
        var allDiscounts = await _discountService.GetAllDiscountsAsync(DiscountType.AssignedToSkus, showHidden: true, isActive: null);

        foreach (var discount in allDiscounts)
        {
            if (model.SelectedDiscountIds != null && model.SelectedDiscountIds.Contains(discount.Id))
            {
                //new discount
                if (await _productService.GetDiscountAppliedToProductAsync(product.Id, discount.Id) is null)
                    await _productService.InsertDiscountProductMappingAsync(new DiscountProductMapping { EntityId = product.Id, DiscountId = discount.Id });
            }
            else
            {
                //remove discount
                if (await _productService.GetDiscountAppliedToProductAsync(product.Id, discount.Id) is DiscountProductMapping discountProductMapping)
                    await _productService.DeleteDiscountProductMappingAsync(discountProductMapping);
            }
        }

        await _productService.UpdateProductAsync(product);
    }

    protected virtual async Task<string> GetAttributesXmlForProductAttributeCombinationAsync(IFormCollection form, List<string> warnings, int productId)
    {
        var attributesXml = string.Empty;

        //get product attribute mappings (exclude non-combinable attributes)
        var attributes = (await _productAttributeService.GetProductAttributeMappingsByProductIdAsync(productId))
            .Where(productAttributeMapping => !productAttributeMapping.IsNonCombinable()).ToList();

        foreach (var attribute in attributes)
        {
            var controlId = $"{NopCatalogDefaults.ProductAttributePrefix}{attribute.Id}";
            StringValues ctrlAttributes;

            switch (attribute.AttributeControlType)
            {
                case AttributeControlType.DropdownList:
                case AttributeControlType.RadioList:
                case AttributeControlType.ColorSquares:
                case AttributeControlType.ImageSquares:
                    ctrlAttributes = form[controlId];
                    if (!string.IsNullOrEmpty(ctrlAttributes))
                    {
                        var selectedAttributeId = int.Parse(ctrlAttributes);
                        if (selectedAttributeId > 0)
                            attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                                attribute, selectedAttributeId.ToString());
                    }

                    break;
                case AttributeControlType.Checkboxes:
                    var cblAttributes = form[controlId].ToString();
                    if (!string.IsNullOrEmpty(cblAttributes))
                    {
                        foreach (var item in cblAttributes.Split(_separator,
                                     StringSplitOptions.RemoveEmptyEntries))
                        {
                            var selectedAttributeId = int.Parse(item);
                            if (selectedAttributeId > 0)
                                attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                                    attribute, selectedAttributeId.ToString());
                        }
                    }

                    break;
                case AttributeControlType.ReadonlyCheckboxes:
                    //load read-only (already server-side selected) values
                    var attributeValues = await _productAttributeService.GetProductAttributeValuesAsync(attribute.Id);
                    foreach (var selectedAttributeId in attributeValues
                                 .Where(v => v.IsPreSelected)
                                 .Select(v => v.Id)
                                 .ToList())
                    {
                        attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                            attribute, selectedAttributeId.ToString());
                    }

                    break;
                case AttributeControlType.TextBox:
                case AttributeControlType.MultilineTextbox:
                    ctrlAttributes = form[controlId];
                    if (!string.IsNullOrEmpty(ctrlAttributes))
                    {
                        var enteredText = ctrlAttributes.ToString().Trim();
                        attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                            attribute, enteredText);
                    }

                    break;
                case AttributeControlType.Datepicker:
                    var date = form[controlId + "_day"];
                    var month = form[controlId + "_month"];
                    var year = form[controlId + "_year"];
                    DateTime? selectedDate = null;
                    try
                    {
                        selectedDate = new DateTime(int.Parse(year), int.Parse(month), int.Parse(date));
                    }
                    catch
                    {
                        //ignore any exception
                    }

                    if (selectedDate.HasValue)
                    {
                        attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                            attribute, selectedDate.Value.ToString("D"));
                    }

                    break;
                case AttributeControlType.FileUpload:
                    var requestForm = await Request.ReadFormAsync();
                    var httpPostedFile = requestForm.Files[controlId];
                    if (!string.IsNullOrEmpty(httpPostedFile?.FileName))
                    {
                        var fileSizeOk = true;
                        if (attribute.ValidationFileMaximumSize.HasValue)
                        {
                            //compare in bytes
                            var maxFileSizeBytes = attribute.ValidationFileMaximumSize.Value * 1024;
                            if (httpPostedFile.Length > maxFileSizeBytes)
                            {
                                warnings.Add(string.Format(
                                    await _localizationService.GetResourceAsync("ShoppingCart.MaximumUploadedFileSize"),
                                    attribute.ValidationFileMaximumSize.Value));
                                fileSizeOk = false;
                            }
                        }

                        if (fileSizeOk)
                        {
                            //save an uploaded file
                            var download = new Download
                            {
                                DownloadGuid = Guid.NewGuid(),
                                UseDownloadUrl = false,
                                DownloadUrl = string.Empty,
                                DownloadBinary = await _downloadService.GetDownloadBitsAsync(httpPostedFile),
                                ContentType = httpPostedFile.ContentType,
                                Filename = _fileProvider.GetFileNameWithoutExtension(httpPostedFile.FileName),
                                Extension = _fileProvider.GetFileExtension(httpPostedFile.FileName),
                                IsNew = true
                            };
                            await _downloadService.InsertDownloadAsync(download);

                            //save attribute
                            attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                                attribute, download.DownloadGuid.ToString());
                        }
                    }

                    break;
                default:
                    break;
            }
        }

        //validate conditional attributes (if specified)
        foreach (var attribute in attributes)
        {
            var conditionMet = await _productAttributeParser.IsConditionMetAsync(attribute, attributesXml);
            if (conditionMet.HasValue && !conditionMet.Value)
            {
                attributesXml = _productAttributeParser.RemoveProductAttribute(attributesXml, attribute);
            }
        }

        return attributesXml;
    }

    protected virtual async Task SaveProductWarehouseInventoryAsync(Product product, ProductModel model)
    {
        ArgumentNullException.ThrowIfNull(product);

        if (model.ManageInventoryMethodId != (int)ManageInventoryMethod.ManageStock)
            return;

        if (!model.UseMultipleWarehouses)
            return;

        var warehouses = await _shippingService.GetAllWarehousesAsync();

        var form = await Request.ReadFormAsync();
        var formData = form.ToDictionary(x => x.Key, x => x.Value.ToString());

        foreach (var warehouse in warehouses)
        {
            //parse stock quantity
            var stockQuantity = 0;
            foreach (var formKey in formData.Keys)
            {
                if (!formKey.Equals($"warehouse_qty_{warehouse.Id}", StringComparison.InvariantCultureIgnoreCase))
                    continue;

                _ = int.TryParse(formData[formKey], out stockQuantity);
                break;
            }

            //parse reserved quantity
            var reservedQuantity = 0;
            foreach (var formKey in formData.Keys)
                if (formKey.Equals($"warehouse_reserved_{warehouse.Id}", StringComparison.InvariantCultureIgnoreCase))
                {
                    _ = int.TryParse(formData[formKey], out reservedQuantity);
                    break;
                }

            //parse "used" field
            var used = false;
            foreach (var formKey in formData.Keys)
                if (formKey.Equals($"warehouse_used_{warehouse.Id}", StringComparison.InvariantCultureIgnoreCase))
                {
                    _ = int.TryParse(formData[formKey], out var tmp);
                    used = tmp == warehouse.Id;
                    break;
                }

            //quantity change history message
            var message = $"{await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.MultipleWarehouses")} {await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.Edit")}";

            var existingPwI = (await _productService.GetAllProductWarehouseInventoryRecordsAsync(product.Id)).FirstOrDefault(x => x.WarehouseId == warehouse.Id);
            if (existingPwI != null)
            {
                if (used)
                {
                    var previousStockQuantity = existingPwI.StockQuantity;

                    //update existing record
                    existingPwI.StockQuantity = stockQuantity;
                    existingPwI.ReservedQuantity = reservedQuantity;
                    await _productService.UpdateProductWarehouseInventoryAsync(existingPwI);

                    //quantity change history
                    await _productService.AddStockQuantityHistoryEntryAsync(product, existingPwI.StockQuantity - previousStockQuantity, existingPwI.StockQuantity,
                        existingPwI.WarehouseId, message);
                }
                else
                {
                    //delete. no need to store record for qty 0
                    await _productService.DeleteProductWarehouseInventoryAsync(existingPwI);

                    //quantity change history
                    await _productService.AddStockQuantityHistoryEntryAsync(product, -existingPwI.StockQuantity, 0, existingPwI.WarehouseId, message);
                }
            }
            else
            {
                if (!used)
                    continue;

                //no need to insert a record for qty 0
                existingPwI = new ProductWarehouseInventory
                {
                    WarehouseId = warehouse.Id,
                    ProductId = product.Id,
                    StockQuantity = stockQuantity,
                    ReservedQuantity = reservedQuantity
                };

                await _productService.InsertProductWarehouseInventoryAsync(existingPwI);

                //quantity change history
                await _productService.AddStockQuantityHistoryEntryAsync(product, existingPwI.StockQuantity, existingPwI.StockQuantity,
                    existingPwI.WarehouseId, message);
            }
        }
    }

    protected virtual async Task SaveConditionAttributesAsync(ProductAttributeMapping productAttributeMapping,
        ProductAttributeConditionModel model, IFormCollection form)
    {
        string attributesXml = null;
        if (model.EnableCondition)
        {
            var attribute = await _productAttributeService.GetProductAttributeMappingByIdAsync(model.SelectedProductAttributeId);
            if (attribute != null)
            {
                var controlId = $"{NopCatalogDefaults.ProductAttributePrefix}{attribute.Id}";
                switch (attribute.AttributeControlType)
                {
                    case AttributeControlType.DropdownList:
                    case AttributeControlType.RadioList:
                    case AttributeControlType.ColorSquares:
                    case AttributeControlType.ImageSquares:
                        var ctrlAttributes = form[controlId];
                        if (!StringValues.IsNullOrEmpty(ctrlAttributes))
                        {
                            var selectedAttributeId = int.Parse(ctrlAttributes);
                            //for conditions we should empty values save even when nothing is selected
                            //otherwise "attributesXml" will be empty
                            //hence we won't be able to find a selected attribute
                            attributesXml = _productAttributeParser.AddProductAttribute(null, attribute,
                                selectedAttributeId > 0 ? selectedAttributeId.ToString() : string.Empty);
                        }
                        else
                        {
                            //for conditions we should empty values save even when nothing is selected
                            //otherwise "attributesXml" will be empty
                            //hence we won't be able to find a selected attribute
                            attributesXml = _productAttributeParser.AddProductAttribute(null,
                                attribute, string.Empty);
                        }

                        break;
                    case AttributeControlType.Checkboxes:
                        var cblAttributes = form[controlId];
                        if (!StringValues.IsNullOrEmpty(cblAttributes))
                        {
                            var anyValueSelected = false;
                            foreach (var item in cblAttributes.ToString()
                                         .Split(_separator, StringSplitOptions.RemoveEmptyEntries))
                            {
                                var selectedAttributeId = int.Parse(item);
                                if (selectedAttributeId <= 0)
                                    continue;

                                attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
                                    attribute, selectedAttributeId.ToString());
                                anyValueSelected = true;
                            }

                            if (!anyValueSelected)
                            {
                                //for conditions we should save empty values even when nothing is selected
                                //otherwise "attributesXml" will be empty
                                //hence we won't be able to find a selected attribute
                                attributesXml = _productAttributeParser.AddProductAttribute(null,
                                    attribute, string.Empty);
                            }
                        }
                        else
                        {
                            //for conditions we should save empty values even when nothing is selected
                            //otherwise "attributesXml" will be empty
                            //hence we won't be able to find a selected attribute
                            attributesXml = _productAttributeParser.AddProductAttribute(null,
                                attribute, string.Empty);
                        }

                        break;
                    case AttributeControlType.ReadonlyCheckboxes:
                    case AttributeControlType.TextBox:
                    case AttributeControlType.MultilineTextbox:
                    case AttributeControlType.Datepicker:
                    case AttributeControlType.FileUpload:
                    default:
                        //these attribute types are supported as conditions
                        break;
                }
            }
        }

        productAttributeMapping.ConditionAttributeXml = attributesXml;
        await _productAttributeService.UpdateProductAttributeMappingAsync(productAttributeMapping);
    }

    protected virtual async Task GenerateAttributeCombinationsAsync(Product product, IList<int> allowedAttributeIds = null)
    {
        var allAttributesXml = await _productAttributeParser.GenerateAllCombinationsAsync(product, true, allowedAttributeIds);
        foreach (var attributesXml in allAttributesXml)
        {
            var existingCombination = await _productAttributeParser.FindProductAttributeCombinationAsync(product, attributesXml);

            //already exists?
            if (existingCombination != null)
                continue;

            //new one
            var warnings = new List<string>();
            warnings.AddRange(await _shoppingCartService.GetShoppingCartItemAttributeWarningsAsync(await _workContext.GetCurrentCustomerAsync(),
                ShoppingCartType.ShoppingCart, product, 1, attributesXml, true, true, true));
            if (warnings.Any())
                continue;

            //save combination
            var combination = new ProductAttributeCombination
            {
                ProductId = product.Id,
                AttributesXml = attributesXml,
                StockQuantity = 0,
                AllowOutOfStockOrders = false,
                Sku = null,
                ManufacturerPartNumber = null,
                Gtin = null,
                OverriddenPrice = null,
                NotifyAdminForQuantityBelow = 1
            };
            await _productAttributeService.InsertProductAttributeCombinationAsync(combination);
        }
    }

    protected virtual async Task PingVideoUrlAsync(string videoUrl)
    {
        var path = videoUrl.StartsWith("/")
            ? $"{_webHelper.GetStoreLocation()}{videoUrl.TrimStart('/')}"
            : videoUrl;

        var client = _httpClientFactory.CreateClient(NopHttpDefaults.DefaultHttpClient);
        await client.GetStringAsync(path);
    }

    protected virtual async Task SaveAttributeCombinationPicturesAsync(Product product, ProductAttributeCombination combination, ProductAttributeCombinationModel model)
    {
        var existingCombinationPictures = await _productAttributeService.GetProductAttributeCombinationPicturesAsync(combination.Id);
        var productPictureIds = (await _pictureService.GetPicturesByProductIdAsync(product.Id)).Select(p => p.Id).ToList();

        //delete manufacturers
        foreach (var existingCombinationPicture in existingCombinationPictures)
            if (!model.PictureIds.Contains(existingCombinationPicture.PictureId) || !productPictureIds.Contains(existingCombinationPicture.PictureId))
                await _productAttributeService.DeleteProductAttributeCombinationPictureAsync(existingCombinationPicture);

        //add manufacturers
        foreach (var pictureId in model.PictureIds)
        {
            if (!productPictureIds.Contains(pictureId))
                continue;

            if (_productAttributeService.FindProductAttributeCombinationPicture(existingCombinationPictures, combination.Id, pictureId) == null)
            {
                await _productAttributeService.InsertProductAttributeCombinationPictureAsync(new ProductAttributeCombinationPicture
                {
                    ProductAttributeCombinationId = combination.Id,
                    PictureId = pictureId
                });
            }
        }
    }

    protected virtual async Task SaveAttributeValuePicturesAsync(Product product, ProductAttributeValue value, ProductAttributeValueModel model)
    {
        var existingValuePictures = await _productAttributeService.GetProductAttributeValuePicturesAsync(value.Id);
        var productPictureIds = (await _pictureService.GetPicturesByProductIdAsync(product.Id)).Select(p => p.Id).ToList();

        //delete manufacturers
        foreach (var existingValuePicture in existingValuePictures)
            if (!model.PictureIds.Contains(existingValuePicture.PictureId) || !productPictureIds.Contains(existingValuePicture.PictureId))
                await _productAttributeService.DeleteProductAttributeValuePictureAsync(existingValuePicture);

        //add manufacturers
        foreach (var pictureId in model.PictureIds)
        {
            if (!productPictureIds.Contains(pictureId))
                continue;

            if (_productAttributeService.FindProductAttributeValuePicture(existingValuePictures, value.Id, pictureId) == null)
            {
                await _productAttributeService.InsertProductAttributeValuePictureAsync(new ProductAttributeValuePicture
                {
                    ProductAttributeValueId = value.Id,
                    PictureId = pictureId
                });
            }
        }
    }

    #endregion

    #region Methods

    #region Product list / create / edit / delete

    public virtual IActionResult Index()
    {
        return RedirectToAction("List");
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> List()
    {
        //prepare model
        var model = await _productModelFactory.PrepareProductSearchModelAsync(new ProductSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> ProductList(ProductSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareProductListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost, ActionName("List")]
    [FormValueRequired("go-to-product-by-sku")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> GoToSku(ProductSearchModel searchModel)
    {
        //try to load a product entity, if not found, then try to load a product attribute combination
        var productId = (await _productService.GetProductBySkuAsync(searchModel.GoDirectlyToSku))?.Id
            ?? (await _productAttributeService.GetProductAttributeCombinationBySkuAsync(searchModel.GoDirectlyToSku))?.ProductId;

        if (productId != null)
            return RedirectToAction("Edit", "Product", new { id = productId });

        //not found
        return await List();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> Create(bool showtour = false)
    {
        //validate maximum number of products per vendor
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (_vendorSettings.MaximumProductNumber > 0 &&
            currentVendor != null &&
            await _productService.GetNumberOfProductsByVendorIdAsync(currentVendor.Id) >= _vendorSettings.MaximumProductNumber)
        {
            _notificationService.ErrorNotification(string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ExceededMaximumNumber"),
                _vendorSettings.MaximumProductNumber));
            return RedirectToAction("List");
        }

        //prepare model
        var model = await _productModelFactory.PrepareProductModelAsync(new ProductModel(), null);

        //show configuration tour
        if (showtour)
        {
            var customer = await _workContext.GetCurrentCustomerAsync();
            var hideCard = await _genericAttributeService.GetAttributeAsync<bool>(customer, NopCustomerDefaults.HideConfigurationStepsAttribute);
            var closeCard = await _genericAttributeService.GetAttributeAsync<bool>(customer, NopCustomerDefaults.CloseConfigurationStepsAttribute);

            if (!hideCard && !closeCard)
                ViewBag.ShowTour = true;
        }

        return View(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> Create(ProductModel model, bool continueEditing)
    {
        //validate maximum number of products per vendor
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (_vendorSettings.MaximumProductNumber > 0 &&
            currentVendor != null &&
            await _productService.GetNumberOfProductsByVendorIdAsync(currentVendor.Id) >= _vendorSettings.MaximumProductNumber)
        {
            _notificationService.ErrorNotification(string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ExceededMaximumNumber"),
                _vendorSettings.MaximumProductNumber));
            return RedirectToAction("List");
        }

        if (ModelState.IsValid)
        {
            //a vendor should have access only to his products
            if (currentVendor != null)
                model.VendorId = currentVendor.Id;

            //vendors cannot edit "Show on home page" property
            if (currentVendor != null && model.ShowOnHomepage)
                model.ShowOnHomepage = false;

            //product
            var product = model.ToEntity<Product>();
            product.CreatedOnUtc = DateTime.UtcNow;
            product.UpdatedOnUtc = DateTime.UtcNow;
            await _productService.InsertProductAsync(product);

            //search engine name
            model.SeName = await _urlRecordService.ValidateSeNameAsync(product, model.SeName, product.Name, true);
            await _urlRecordService.SaveSlugAsync(product, model.SeName, 0);

            //locales
            await UpdateLocalesAsync(product, model);

            //categories
            await SaveCategoryMappingsAsync(product, model);

            //manufacturers
            await SaveManufacturerMappingsAsync(product, model);
            
            //stores
            await _productService.UpdateProductStoreMappingsAsync(product, model.SelectedStoreIds);

            //discounts
            await SaveDiscountMappingsAsync(product, model);

            //tags
            await _productTagService.UpdateProductTagsAsync(product, model.SelectedProductTags.ToArray());

            //warehouses
            await SaveProductWarehouseInventoryAsync(product, model);

            //quantity change history
            await _productService.AddStockQuantityHistoryEntryAsync(product, product.StockQuantity, product.StockQuantity, product.WarehouseId,
                await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.Edit"));

            //activity log
            await _customerActivityService.InsertActivityAsync("AddNewProduct",
                string.Format(await _localizationService.GetResourceAsync("ActivityLog.AddNewProduct"), product.Name), product);

            _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Added"));

            if (!continueEditing)
                return RedirectToAction("List");

            return RedirectToAction("Edit", new { id = product.Id });
        }

        //prepare model
        model = await _productModelFactory.PrepareProductModelAsync(model, null, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> Edit(int id)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(id);
        if (product == null || product.Deleted)
            return RedirectToAction("List");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List");

        //prepare model
        var model = await _productModelFactory.PrepareProductModelAsync(null, product);

        return View(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> Edit(ProductModel model, bool continueEditing)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(model.Id);
        if (product == null || product.Deleted)
            return RedirectToAction("List");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List");

        //check if the product quantity has been changed while we were editing the product
        //and if it has been changed then we show error notification
        //and redirect on the editing page without data saving
        if (product.StockQuantity != model.LastStockQuantity)
        {
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Fields.StockQuantity.ChangedWarning"));
            return RedirectToAction("Edit", new { id = product.Id });
        }

        if (ModelState.IsValid)
        {
            //a vendor should have access only to his products
            if (currentVendor != null)
                model.VendorId = currentVendor.Id;

            //we do not validate maximum number of products per vendor when editing existing products (only during creation of new products)
            //vendors cannot edit "Show on home page" property
            if (currentVendor != null && model.ShowOnHomepage != product.ShowOnHomepage)
                model.ShowOnHomepage = product.ShowOnHomepage;

            //some previously used values
            var prevTotalStockQuantity = await _productService.GetTotalStockQuantityAsync(product);
            var prevDownloadId = product.DownloadId;
            var prevSampleDownloadId = product.SampleDownloadId;
            var previousStockQuantity = product.StockQuantity;
            var previousWarehouseId = product.WarehouseId;
            var previousProductType = product.ProductType;

            //product
            product = model.ToEntity(product);

            product.UpdatedOnUtc = DateTime.UtcNow;
            await _productService.UpdateProductAsync(product);

            //remove associated products
            if (previousProductType == ProductType.GroupedProduct && product.ProductType == ProductType.SimpleProduct)
            {
                var store = await _storeContext.GetCurrentStoreAsync();
                var storeId = store?.Id ?? 0;
                var vendorId = currentVendor?.Id ?? 0;

                var associatedProducts = await _productService.GetAssociatedProductsAsync(product.Id, storeId, vendorId);
                foreach (var associatedProduct in associatedProducts)
                {
                    associatedProduct.ParentGroupedProductId = 0;
                    await _productService.UpdateProductAsync(associatedProduct);
                }
            }

            //search engine name
            model.SeName = await _urlRecordService.ValidateSeNameAsync(product, model.SeName, product.Name, true);
            await _urlRecordService.SaveSlugAsync(product, model.SeName, 0);

            //locales
            await UpdateLocalesAsync(product, model);

            //tags
            await _productTagService.UpdateProductTagsAsync(product, model.SelectedProductTags.ToArray());

            //warehouses
            await SaveProductWarehouseInventoryAsync(product, model);

            //categories
            await SaveCategoryMappingsAsync(product, model);

            //manufacturers
            await SaveManufacturerMappingsAsync(product, model);
            
            //stores
            await _productService.UpdateProductStoreMappingsAsync(product, model.SelectedStoreIds);

            //discounts
            await SaveDiscountMappingsAsync(product, model);

            //picture seo names
            await UpdatePictureSeoNamesAsync(product);

            //back in stock notifications
            if (product.ManageInventoryMethod == ManageInventoryMethod.ManageStock &&
                product.BackorderMode == BackorderMode.NoBackorders &&
                product.AllowBackInStockSubscriptions &&
                await _productService.GetTotalStockQuantityAsync(product) > 0 &&
                prevTotalStockQuantity <= 0 &&
                product.Published &&
                !product.Deleted)
            {
                await _backInStockSubscriptionService.SendNotificationsToSubscribersAsync(product);
            }

            //delete an old "download" file (if deleted or updated)
            if (prevDownloadId > 0 && prevDownloadId != product.DownloadId)
            {
                var prevDownload = await _downloadService.GetDownloadByIdAsync(prevDownloadId);
                if (prevDownload != null)
                    await _downloadService.DeleteDownloadAsync(prevDownload);
            }

            //delete an old "sample download" file (if deleted or updated)
            if (prevSampleDownloadId > 0 && prevSampleDownloadId != product.SampleDownloadId)
            {
                var prevSampleDownload = await _downloadService.GetDownloadByIdAsync(prevSampleDownloadId);
                if (prevSampleDownload != null)
                    await _downloadService.DeleteDownloadAsync(prevSampleDownload);
            }

            //quantity change history
            if (previousWarehouseId != product.WarehouseId)
            {
                //warehouse is changed 
                //compose a message
                var oldWarehouseMessage = string.Empty;
                if (previousWarehouseId > 0)
                {
                    var oldWarehouse = await _shippingService.GetWarehouseByIdAsync(previousWarehouseId);
                    if (oldWarehouse != null)
                        oldWarehouseMessage = string.Format(await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.EditWarehouse.Old"), oldWarehouse.Name);
                }

                var newWarehouseMessage = string.Empty;
                if (product.WarehouseId > 0)
                {
                    var newWarehouse = await _shippingService.GetWarehouseByIdAsync(product.WarehouseId);
                    if (newWarehouse != null)
                        newWarehouseMessage = string.Format(await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.EditWarehouse.New"), newWarehouse.Name);
                }

                var message = string.Format(await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.EditWarehouse"), oldWarehouseMessage, newWarehouseMessage);

                //record history
                await _productService.AddStockQuantityHistoryEntryAsync(product, -previousStockQuantity, 0, previousWarehouseId, message);
                await _productService.AddStockQuantityHistoryEntryAsync(product, product.StockQuantity, product.StockQuantity, product.WarehouseId, message);
            }
            else
            {
                await _productService.AddStockQuantityHistoryEntryAsync(product, product.StockQuantity - previousStockQuantity, product.StockQuantity,
                    product.WarehouseId, await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.Edit"));
            }

            //activity log
            await _customerActivityService.InsertActivityAsync("EditProduct",
                string.Format(await _localizationService.GetResourceAsync("ActivityLog.EditProduct"), product.Name), product);

            _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Updated"));

            if (!continueEditing)
                return RedirectToAction("List");

            return RedirectToAction("Edit", new { id = product.Id });
        }

        //prepare model
        model = await _productModelFactory.PrepareProductModelAsync(model, product, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> Delete(int id)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(id);
        if (product == null)
            return RedirectToAction("List");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List");

        await _productService.DeleteProductAsync(product);

        //activity log
        await _customerActivityService.InsertActivityAsync("DeleteProduct",
            string.Format(await _localizationService.GetResourceAsync("ActivityLog.DeleteProduct"), product.Name), product);

        _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Deleted"));

        return RedirectToAction("List");
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> DeleteSelected(ICollection<int> selectedIds)
    {
        if (selectedIds == null || !selectedIds.Any())
            return NoContent();

        var currentVendor = await _workContext.GetCurrentVendorAsync();
        await _productService.DeleteProductsAsync((await _productService.GetProductsByIdsAsync(selectedIds.ToArray()))
            .Where(p => currentVendor == null || p.VendorId == currentVendor.Id).ToList());

        return Json(new { Result = true });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> CopyProduct(ProductModel model)
    {
        var copyModel = model.CopyProductModel;
        try
        {
            var originalProduct = await _productService.GetProductByIdAsync(copyModel.Id);

            //a vendor should have access only to his products
            var currentVendor = await _workContext.GetCurrentVendorAsync();
            if (currentVendor != null && originalProduct.VendorId != currentVendor.Id)
                return RedirectToAction("List");

            var newProduct = await _copyProductService.CopyProductAsync(originalProduct, copyModel.Name, copyModel.Published, copyModel.CopyMultimedia);

            _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Copied"));

            return RedirectToAction("Edit", new { id = newProduct.Id });
        }
        catch (Exception exc)
        {
            _notificationService.ErrorNotification(exc.Message);
            return RedirectToAction("Edit", new { id = copyModel.Id });
        }
    }

    //action displaying notification (warning) to a store owner that entered SKU already exists
    public virtual async Task<IActionResult> SkuReservedWarning(int productId, string sku)
    {
        string message;

        //check whether product with passed SKU already exists
        var productBySku = await _productService.GetProductBySkuAsync(sku);
        if (productBySku != null)
        {
            if (productBySku.Id == productId)
                return Json(new { Result = string.Empty });

            message = string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Fields.Sku.Reserved"), productBySku.Name);
            return Json(new { Result = message });
        }

        //check whether combination with passed SKU already exists
        var combinationBySku = await _productAttributeService.GetProductAttributeCombinationBySkuAsync(sku);
        if (combinationBySku == null)
            return Json(new { Result = string.Empty });

        message = string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.Fields.Sku.Reserved"),
            (await _productService.GetProductByIdAsync(combinationBySku.ProductId))?.Name);

        return Json(new { Result = message });
    }

    #endregion

    #region Required products

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> LoadProductFriendlyNames(string productIds)
    {
        var result = string.Empty;
        
        if (string.IsNullOrWhiteSpace(productIds))
            return Json(new { Text = result });

        var ids = new List<int>();
        var rangeArray = productIds
            .Split(_separator, StringSplitOptions.RemoveEmptyEntries)
            .Select(x => x.Trim())
            .ToList();

        foreach (var str1 in rangeArray)
        {
            if (int.TryParse(str1, out var tmp1))
                ids.Add(tmp1);
        }

        var products = await _productService.GetProductsByIdsAsync(ids.ToArray());
        for (var i = 0; i <= products.Count - 1; i++)
        {
            result += products[i].Name;
            if (i != products.Count - 1)
                result += ", ";
        }

        return Json(new { Text = result });
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RequiredProductAddPopup()
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddRequiredProductSearchModelAsync(new AddRequiredProductSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RequiredProductAddPopupList(AddRequiredProductSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddRequiredProductListModelAsync(searchModel);

        return Json(model);
    }

    #endregion

    #region Related products

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> RelatedProductList(RelatedProductSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareRelatedProductListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RelatedProductUpdate(RelatedProductModel model)
    {
        //try to get a related product with the specified id
        var relatedProduct = await _productService.GetRelatedProductByIdAsync(model.Id)
            ?? throw new ArgumentException("No related product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(relatedProduct.ProductId1);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        relatedProduct.DisplayOrder = model.DisplayOrder;
        await _productService.UpdateRelatedProductAsync(relatedProduct);

        return new NullJsonResult();
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RelatedProductDelete(int id)
    {
        //try to get a related product with the specified id
        var relatedProduct = await _productService.GetRelatedProductByIdAsync(id)
            ?? throw new ArgumentException("No related product found with the specified id");

        var productId = relatedProduct.ProductId1;

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(productId);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        await _productService.DeleteRelatedProductAsync(relatedProduct);

        return new NullJsonResult();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RelatedProductAddPopup(int productId)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddRelatedProductSearchModelAsync(new AddRelatedProductSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RelatedProductAddPopupList(AddRelatedProductSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddRelatedProductListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost]
    [FormValueRequired("save")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> RelatedProductAddPopup(AddRelatedProductModel model)
    {
        var selectedProducts = await _productService.GetProductsByIdsAsync(model.SelectedProductIds.ToArray());
        if (selectedProducts.Any())
        {
            var existingRelatedProducts = await _productService.GetRelatedProductsByProductId1Async(model.ProductId, showHidden: true);
            var currentVendor = await _workContext.GetCurrentVendorAsync();
            foreach (var product in selectedProducts)
            {
                //a vendor should have access only to his products
                if (currentVendor != null && product.VendorId != currentVendor.Id)
                    continue;

                if (_productService.FindRelatedProduct(existingRelatedProducts, model.ProductId, product.Id) != null)
                    continue;

                await _productService.InsertRelatedProductAsync(new RelatedProduct
                {
                    ProductId1 = model.ProductId,
                    ProductId2 = product.Id,
                    DisplayOrder = 1
                });
            }
        }

        ViewBag.RefreshPage = true;

        return View(new AddRelatedProductSearchModel());
    }

    #endregion

    #region Cross-sell products

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> CrossSellProductList(CrossSellProductSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareCrossSellProductListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> CrossSellProductDelete(int id)
    {
        //try to get a cross-sell product with the specified id
        var crossSellProduct = await _productService.GetCrossSellProductByIdAsync(id)
            ?? throw new ArgumentException("No cross-sell product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(crossSellProduct.ProductId1);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        await _productService.DeleteCrossSellProductAsync(crossSellProduct);

        return new NullJsonResult();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> CrossSellProductAddPopup(int productId)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddCrossSellProductSearchModelAsync(new AddCrossSellProductSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> CrossSellProductAddPopupList(AddCrossSellProductSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddCrossSellProductListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost]
    [FormValueRequired("save")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> CrossSellProductAddPopup(AddCrossSellProductModel model)
    {
        var selectedProducts = await _productService.GetProductsByIdsAsync(model.SelectedProductIds.ToArray());
        if (selectedProducts.Any())
        {
            var existingCrossSellProducts = await _productService.GetCrossSellProductsByProductId1Async(model.ProductId, showHidden: true);
            var currentVendor = await _workContext.GetCurrentVendorAsync();
            foreach (var product in selectedProducts)
            {
                //a vendor should have access only to his products
                if (currentVendor != null && product.VendorId != currentVendor.Id)
                    continue;

                if (_productService.FindCrossSellProduct(existingCrossSellProducts, model.ProductId, product.Id) != null)
                    continue;

                await _productService.InsertCrossSellProductAsync(new CrossSellProduct
                {
                    ProductId1 = model.ProductId,
                    ProductId2 = product.Id
                });
            }
        }

        ViewBag.RefreshPage = true;

        return View(new AddCrossSellProductSearchModel());
    }

    #endregion

    #region Associated products

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> AssociatedProductList(AssociatedProductSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareAssociatedProductListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociatedProductUpdate(AssociatedProductModel model)
    {
        //try to get an associated product with the specified id
        var associatedProduct = await _productService.GetProductByIdAsync(model.Id)
            ?? throw new ArgumentException("No associated product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && associatedProduct.VendorId != currentVendor.Id)
            return Content("This is not your product");

        associatedProduct.DisplayOrder = model.DisplayOrder;
        await _productService.UpdateProductAsync(associatedProduct);

        return new NullJsonResult();
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociatedProductDelete(int id)
    {
        //try to get an associated product with the specified id
        var product = await _productService.GetProductByIdAsync(id)
            ?? throw new ArgumentException("No associated product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        product.ParentGroupedProductId = 0;
        await _productService.UpdateProductAsync(product);

        return new NullJsonResult();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociatedProductAddPopup(int productId)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddAssociatedProductSearchModelAsync(new AddAssociatedProductSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociatedProductAddPopupList(AddAssociatedProductSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAddAssociatedProductListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost]
    [FormValueRequired("save")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociatedProductAddPopup(AddAssociatedProductModel model)
    {
        var selectedProducts = await _productService.GetProductsByIdsAsync(model.SelectedProductIds.ToArray());

        var tryToAddSelfGroupedProduct = selectedProducts
            .Select(p => p.Id)
            .Contains(model.ProductId);

        if (selectedProducts.Any())
        {
            foreach (var product in selectedProducts)
            {
                if (product.Id == model.ProductId)
                    continue;

                //a vendor should have access only to his products
                var currentVendor = await _workContext.GetCurrentVendorAsync();
                if (currentVendor != null && product.VendorId != currentVendor.Id)
                    continue;

                product.ParentGroupedProductId = model.ProductId;
                await _productService.UpdateProductAsync(product);
            }
        }

        if (tryToAddSelfGroupedProduct)
        {
            _notificationService.WarningNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.AssociatedProducts.TryToAddSelfGroupedProduct"));

            var addAssociatedProductSearchModel = await _productModelFactory.PrepareAddAssociatedProductSearchModelAsync(new AddAssociatedProductSearchModel());
            //set current product id
            addAssociatedProductSearchModel.ProductId = model.ProductId;

            ViewBag.RefreshPage = true;

            return View(addAssociatedProductSearchModel);
        }

        ViewBag.RefreshPage = true;

        ViewBag.ClosePage = true;

        return View(new AddAssociatedProductSearchModel());
    }

    #endregion

    #region Product pictures

    [HttpPost]
    [IgnoreAntiforgeryToken]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductPictureAdd(int productId, IFormCollection form)
    {
        if (productId == 0)
            throw new ArgumentException();

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId)
            ?? throw new ArgumentException("No product found with the specified id");

        var files = form.Files.ToList();
        if (!files.Any())
            return Json(new { success = false });

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List");
        try
        {
            foreach (var file in files)
            {
                //insert picture
                var picture = await _pictureService.InsertPictureAsync(file);

                await _pictureService.SetSeoFilenameAsync(picture.Id, await _pictureService.GetPictureSeNameAsync(product.Name));

                await _productService.InsertProductPictureAsync(new ProductPicture
                {
                    PictureId = picture.Id,
                    ProductId = product.Id,
                    DisplayOrder = 0
                });
            }
        }
        catch (Exception exc)
        {
            return Json(new
            {
                success = false,
                message = $"{await _localizationService.GetResourceAsync("Admin.Catalog.Products.Multimedia.Pictures.Alert.PictureAdd")} {exc.Message}",
            });
        }

        return Json(new { success = true });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> ProductPictureList(ProductPictureSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductPictureListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductPictureUpdate(ProductPictureModel model)
    {
        //try to get a product picture with the specified id
        var productPicture = await _productService.GetProductPictureByIdAsync(model.Id)
            ?? throw new ArgumentException("No product picture found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(productPicture.ProductId);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        //try to get a picture with the specified id
        var picture = await _pictureService.GetPictureByIdAsync(productPicture.PictureId)
            ?? throw new ArgumentException("No picture found with the specified id");

        await _pictureService.UpdatePictureAsync(picture.Id,
            await _pictureService.LoadPictureBinaryAsync(picture),
            picture.MimeType,
            picture.SeoFilename,
            model.OverrideAltAttribute,
            model.OverrideTitleAttribute);

        productPicture.DisplayOrder = model.DisplayOrder;
        await _productService.UpdateProductPictureAsync(productPicture);

        return new NullJsonResult();
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductPictureDelete(int id)
    {
        //try to get a product picture with the specified id
        var productPicture = await _productService.GetProductPictureByIdAsync(id)
            ?? throw new ArgumentException("No product picture found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(productPicture.ProductId);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        var pictureId = productPicture.PictureId;
        await _productService.DeleteProductPictureAsync(productPicture);

        //try to get a picture with the specified id
        var picture = await _pictureService.GetPictureByIdAsync(pictureId)
            ?? throw new ArgumentException("No picture found with the specified id");

        await _pictureService.DeletePictureAsync(picture);

        return new NullJsonResult();
    }

    #endregion

    #region Product videos

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductVideoAdd(int productId, [Validate] ProductVideoModel model)
    {
        if (productId == 0)
            throw new ArgumentException();

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId)
            ?? throw new ArgumentException("No product found with the specified id");

        if (string.IsNullOrEmpty(model.VideoUrl))
            ModelState.AddModelError(string.Empty,
                await _localizationService.GetResourceAsync("Admin.Catalog.Products.Multimedia.Videos.Alert.VideoAdd.EmptyUrl"));

        if (!ModelState.IsValid)
            return ErrorJson(ModelState.SerializeErrors());

        var videoUrl = model.VideoUrl.TrimStart('~');

        try
        {
            await PingVideoUrlAsync(videoUrl);
        }
        catch (Exception exc)
        {
            return Json(new
            {
                success = false,
                error = $"{await _localizationService.GetResourceAsync("Admin.Catalog.Products.Multimedia.Videos.Alert.VideoAdd")} {exc.Message}",
            });
        }

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List");
        try
        {
            var video = new Video
            {
                VideoUrl = videoUrl
            };

            //insert video
            await _videoService.InsertVideoAsync(video);

            await _productService.InsertProductVideoAsync(new ProductVideo
            {
                VideoId = video.Id,
                ProductId = product.Id,
                DisplayOrder = model.DisplayOrder
            });
        }
        catch (Exception exc)
        {
            return Json(new
            {
                success = false,
                error = $"{await _localizationService.GetResourceAsync("Admin.Catalog.Products.Multimedia.Videos.Alert.VideoAdd")} {exc.Message}",
            });
        }

        return Json(new { success = true });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> ProductVideoList(ProductVideoSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductVideoListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductVideoUpdate([Validate] ProductVideoModel model)
    {
        //try to get a product picture with the specified id
        var productVideo = await _productService.GetProductVideoByIdAsync(model.Id)
            ?? throw new ArgumentException("No product video found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(productVideo.ProductId);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        //try to get a video with the specified id
        var video = await _videoService.GetVideoByIdAsync(productVideo.VideoId)
            ?? throw new ArgumentException("No video found with the specified id");

        var videoUrl = model.VideoUrl.TrimStart('~');

        try
        {
            await PingVideoUrlAsync(videoUrl);
        }
        catch (Exception exc)
        {
            return Json(new
            {
                success = false,
                error = $"{await _localizationService.GetResourceAsync("Admin.Catalog.Products.Multimedia.Videos.Alert.VideoUpdate")} {exc.Message}",
            });
        }

        video.VideoUrl = videoUrl;

        await _videoService.UpdateVideoAsync(video);

        productVideo.DisplayOrder = model.DisplayOrder;
        await _productService.UpdateProductVideoAsync(productVideo);

        return new NullJsonResult();
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductVideoDelete(int id)
    {
        //try to get a product video with the specified id
        var productVideo = await _productService.GetProductVideoByIdAsync(id)
            ?? throw new ArgumentException("No product video found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            var product = await _productService.GetProductByIdAsync(productVideo.ProductId);
            if (product != null && product.VendorId != currentVendor.Id)
                return Content("This is not your product");
        }

        var videoId = productVideo.VideoId;
        await _productService.DeleteProductVideoAsync(productVideo);

        //try to get a video with the specified id
        var video = await _videoService.GetVideoByIdAsync(videoId)
            ?? throw new ArgumentException("No video found with the specified id");

        await _videoService.DeleteVideoAsync(video);

        return new NullJsonResult();
    }

    #endregion

    #region Product specification attributes

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductSpecificationAttributeAdd(AddSpecificationAttributeModel model, bool continueEditing)
    {
        var product = await _productService.GetProductByIdAsync(model.ProductId);
        if (product == null)
        {
            _notificationService.ErrorNotification("No product found with the specified id");
            return RedirectToAction("List");
        }

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
        {
            return RedirectToAction("List");
        }

        //we allow filtering only for "Option" attribute type
        if (model.AttributeTypeId != (int)SpecificationAttributeType.Option)
            model.AllowFiltering = false;

        //we don't allow CustomValue for "Option" attribute type
        if (model.AttributeTypeId == (int)SpecificationAttributeType.Option)
            model.ValueRaw = null;

        //store raw html if field allow this
        if (model.AttributeTypeId == (int)SpecificationAttributeType.CustomText || model.AttributeTypeId == (int)SpecificationAttributeType.Hyperlink)
            model.ValueRaw = model.Value;

        var psa = model.ToEntity<ProductSpecificationAttribute>();
        psa.CustomValue = model.ValueRaw;
        await _specificationAttributeService.InsertProductSpecificationAttributeAsync(psa);

        switch (psa.AttributeType)
        {
            case SpecificationAttributeType.CustomText:
                foreach (var localized in model.Locales)
                {
                    await _localizedEntityService.SaveLocalizedValueAsync(psa,
                        x => x.CustomValue,
                        localized.Value,
                        localized.LanguageId);
                }

                break;
            case SpecificationAttributeType.CustomHtmlText:
                foreach (var localized in model.Locales)
                {
                    await _localizedEntityService.SaveLocalizedValueAsync(psa,
                        x => x.CustomValue,
                        localized.ValueRaw,
                        localized.LanguageId);
                }

                break;
            case SpecificationAttributeType.Option:
                break;
            case SpecificationAttributeType.Hyperlink:
                break;
            default:
                throw new ArgumentOutOfRangeException();
        }

        if (continueEditing)
            return RedirectToAction("ProductSpecAttributeAddOrEdit",
                new { productId = psa.ProductId, specificationId = psa.Id });

        //select an appropriate card
        SaveSelectedCardName("product-specification-attributes");
        return RedirectToAction("Edit", new { id = model.ProductId });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> ProductSpecAttrList(ProductSpecificationAttributeSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductSpecificationAttributeListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductSpecAttrUpdate(AddSpecificationAttributeModel model, bool continueEditing)
    {
        //try to get a product specification attribute with the specified id
        var psa = await _specificationAttributeService.GetProductSpecificationAttributeByIdAsync(model.SpecificationId);
        if (psa == null)
        {
            //select an appropriate card
            SaveSelectedCardName("product-specification-attributes");
            _notificationService.ErrorNotification("No product specification attribute found with the specified id");

            return RedirectToAction("Edit", new { id = model.ProductId });
        }

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null
            && (await _productService.GetProductByIdAsync(psa.ProductId)).VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification("This is not your product");

            return RedirectToAction("List");
        }

        //we allow filtering and change option only for "Option" attribute type
        //save localized values for CustomHtmlText and CustomText
        switch (model.AttributeTypeId)
        {
            case (int)SpecificationAttributeType.Option:
                psa.AllowFiltering = model.AllowFiltering;
                psa.SpecificationAttributeOptionId = model.SpecificationAttributeOptionId;

                break;
            case (int)SpecificationAttributeType.CustomHtmlText:
                psa.CustomValue = model.ValueRaw;
                foreach (var localized in model.Locales)
                {
                    await _localizedEntityService.SaveLocalizedValueAsync(psa,
                        x => x.CustomValue,
                        localized.ValueRaw,
                        localized.LanguageId);
                }

                break;
            case (int)SpecificationAttributeType.CustomText:
                psa.CustomValue = model.Value;
                foreach (var localized in model.Locales)
                {
                    await _localizedEntityService.SaveLocalizedValueAsync(psa,
                        x => x.CustomValue,
                        localized.Value,
                        localized.LanguageId);
                }

                break;
            default:
                psa.CustomValue = model.Value;

                break;
        }

        psa.ShowOnProductPage = model.ShowOnProductPage;
        psa.DisplayOrder = model.DisplayOrder;
        await _specificationAttributeService.UpdateProductSpecificationAttributeAsync(psa);

        if (continueEditing)
        {
            return RedirectToAction("ProductSpecAttributeAddOrEdit",
                new { productId = psa.ProductId, specificationId = model.SpecificationId });
        }

        //select an appropriate card
        SaveSelectedCardName("product-specification-attributes");

        return RedirectToAction("Edit", new { id = psa.ProductId });
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> ProductSpecAttributeAddOrEdit(int productId, int? specificationId)
    {
        if (!specificationId.HasValue && !await _permissionService.AuthorizeAsync(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE))
            return AccessDeniedView();

        if (await _productService.GetProductByIdAsync(productId) == null)
        {
            _notificationService.ErrorNotification("No product found with the specified id");
            return RedirectToAction("List");
        }

        //try to get a product specification attribute with the specified id
        try
        {
            var model = await _productModelFactory.PrepareAddSpecificationAttributeModelAsync(productId, specificationId);
            return View(model);
        }
        catch (Exception ex)
        {
            await _notificationService.ErrorNotificationAsync(ex);

            //select an appropriate card
            SaveSelectedCardName("product-specification-attributes");
            return RedirectToAction("Edit", new { id = productId });
        }
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductSpecAttrDelete(AddSpecificationAttributeModel model)
    {
        //try to get a product specification attribute with the specified id
        var psa = await _specificationAttributeService.GetProductSpecificationAttributeByIdAsync(model.SpecificationId);
        if (psa == null)
        {
            //select an appropriate card
            SaveSelectedCardName("product-specification-attributes");
            _notificationService.ErrorNotification("No product specification attribute found with the specified id");
            return RedirectToAction("Edit", new { id = model.ProductId });
        }

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && (await _productService.GetProductByIdAsync(psa.ProductId)).VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification("This is not your product");
            return RedirectToAction("List", new { id = model.ProductId });
        }

        await _specificationAttributeService.DeleteProductSpecificationAttributeAsync(psa);

        //select an appropriate card
        SaveSelectedCardName("product-specification-attributes");

        return RedirectToAction("Edit", new { id = psa.ProductId });
    }

    #endregion

    #region Product tags

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_VIEW)]
    public virtual async Task<IActionResult> ProductTags()
    {
        //prepare model
        var model = await _productModelFactory.PrepareProductTagSearchModelAsync(new ProductTagSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_VIEW)]
    public virtual async Task<IActionResult> ProductTags(ProductTagSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareProductTagListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductTagDelete(int id)
    {
        //try to get a product tag with the specified id
        var tag = await _productTagService.GetProductTagByIdAsync(id)
            ?? throw new ArgumentException("No product tag found with the specified id");

        await _productTagService.DeleteProductTagAsync(tag);

        _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.ProductTags.Deleted"));

        return RedirectToAction("ProductTags");
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductTagsDelete(ICollection<int> selectedIds)
    {
        if (selectedIds == null || !selectedIds.Any())
            return NoContent();

        var tags = await _productTagService.GetProductTagsByIdsAsync(selectedIds.ToArray());
        await _productTagService.DeleteProductTagsAsync(tags);

        return Json(new { Result = true });
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_VIEW)]
    public virtual async Task<IActionResult> EditProductTag(int id)
    {
        //try to get a product tag with the specified id
        var productTag = await _productTagService.GetProductTagByIdAsync(id);
        if (productTag == null)
            return RedirectToAction("List");

        //prepare tag model
        var model = await _productModelFactory.PrepareProductTagModelAsync(null, productTag);

        return View(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_TAGS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> EditProductTag(ProductTagModel model, bool continueEditing)
    {
        //try to get a product tag with the specified id
        var productTag = await _productTagService.GetProductTagByIdAsync(model.Id);
        if (productTag == null)
            return RedirectToAction("List");

        if (ModelState.IsValid)
        {
            productTag.Name = model.Name;
            await _productTagService.UpdateProductTagAsync(productTag);

            //locales
            await UpdateLocalesAsync(productTag, model);

            _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.ProductTags.Updated"));

            return continueEditing ? RedirectToAction("EditProductTag", new { id = productTag.Id }) : RedirectToAction("ProductTags");
        }

        //prepare model
        model = await _productModelFactory.PrepareProductTagModelAsync(model, productTag, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    #endregion

    #region Purchased with order

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Orders.ORDERS_VIEW)]
    public virtual async Task<IActionResult> PurchasedWithOrders(ProductOrderSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductOrderListModelAsync(searchModel, product);

        return Json(model);
    }

    #endregion

    #region Export / Import

    [HttpPost, ActionName("DownloadCatalogPDF")]
    [FormValueRequired("download-catalog-pdf")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> DownloadCatalogAsPdf(ProductSearchModel model)
    {
        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            model.SearchVendorId = currentVendor.Id;
        }

        var categoryIds = new List<int> { model.SearchCategoryId };
        //include subcategories
        if (model.SearchIncludeSubCategories && model.SearchCategoryId > 0)
            categoryIds.AddRange(await _categoryService.GetChildCategoryIdsAsync(parentCategoryId: model.SearchCategoryId, showHidden: true));

        //0 - all (according to "ShowHidden" parameter)
        //1 - published only
        //2 - unpublished only
        bool? overridePublished = null;
        if (model.SearchPublishedId == 1)
            overridePublished = true;
        else if (model.SearchPublishedId == 2)
            overridePublished = false;

        var products = await _productService.SearchProductsAsync(0,
            categoryIds: categoryIds,
            manufacturerIds: new List<int> { model.SearchManufacturerId },
            storeId: model.SearchStoreId,
            vendorId: model.SearchVendorId,
            warehouseId: model.SearchWarehouseId,
            productType: model.SearchProductTypeId > 0 ? (ProductType?)model.SearchProductTypeId : null,
            keywords: model.SearchProductName,
            showHidden: true,
            overridePublished: overridePublished);

        try
        {
            byte[] bytes;
            await using (var stream = new MemoryStream())
            {
                await _pdfService.PrintProductsToPdfAsync(stream, products);
                bytes = stream.ToArray();
            }

            return File(bytes, MimeTypes.ApplicationPdf, "pdfcatalog.pdf");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);
            return RedirectToAction("List");
        }
    }

    [HttpPost, ActionName("ExportToXml")]
    [FormValueRequired("exportxml-all")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> ExportXmlAll(ProductSearchModel model)
    {
        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            model.SearchVendorId = currentVendor.Id;
        }

        var categoryIds = new List<int> { model.SearchCategoryId };
        //include subcategories
        if (model.SearchIncludeSubCategories && model.SearchCategoryId > 0)
            categoryIds.AddRange(await _categoryService.GetChildCategoryIdsAsync(parentCategoryId: model.SearchCategoryId, showHidden: true));

        //0 - all (according to "ShowHidden" parameter)
        //1 - published only
        //2 - unpublished only
        bool? overridePublished = null;
        if (model.SearchPublishedId == 1)
            overridePublished = true;
        else if (model.SearchPublishedId == 2)
            overridePublished = false;

        var products = await _productService.SearchProductsAsync(0,
            categoryIds: categoryIds,
            manufacturerIds: new List<int> { model.SearchManufacturerId },
            storeId: model.SearchStoreId,
            vendorId: model.SearchVendorId,
            warehouseId: model.SearchWarehouseId,
            productType: model.SearchProductTypeId > 0 ? (ProductType?)model.SearchProductTypeId : null,
            keywords: model.SearchProductName,
            showHidden: true,
            overridePublished: overridePublished);

        try
        {
            var xml = await _exportManager.ExportProductsToXmlAsync(products);

            return File(Encoding.UTF8.GetBytes(xml), MimeTypes.ApplicationXml, "products.xml");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);
            return RedirectToAction("List");
        }
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> ExportXmlSelected(string selectedIds)
    {
        var products = new List<Product>();
        if (selectedIds != null)
        {
            var ids = selectedIds
                .Split(_separator, StringSplitOptions.RemoveEmptyEntries)
                .Select(x => Convert.ToInt32(x))
                .ToArray();
            products.AddRange(await _productService.GetProductsByIdsAsync(ids));
        }
        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            products = products.Where(p => p.VendorId == currentVendor.Id).ToList();
        }

        try
        {
            var xml = await _exportManager.ExportProductsToXmlAsync(products);
            return File(Encoding.UTF8.GetBytes(xml), MimeTypes.ApplicationXml, "products.xml");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);
            return RedirectToAction("List");
        }
    }

    [HttpPost, ActionName("ExportToExcel")]
    [FormValueRequired("exportexcel-all")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> ExportExcelAll(ProductSearchModel model)
    {
        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            model.SearchVendorId = currentVendor.Id;
        }

        var categoryIds = new List<int> { model.SearchCategoryId };
        //include subcategories
        if (model.SearchIncludeSubCategories && model.SearchCategoryId > 0)
            categoryIds.AddRange(await _categoryService.GetChildCategoryIdsAsync(parentCategoryId: model.SearchCategoryId, showHidden: true));

        //0 - all (according to "ShowHidden" parameter)
        //1 - published only
        //2 - unpublished only
        bool? overridePublished = null;
        if (model.SearchPublishedId == 1)
            overridePublished = true;
        else if (model.SearchPublishedId == 2)
            overridePublished = false;

        var products = await _productService.SearchProductsAsync(0,
            categoryIds: categoryIds,
            manufacturerIds: new List<int> { model.SearchManufacturerId },
            storeId: model.SearchStoreId,
            vendorId: model.SearchVendorId,
            warehouseId: model.SearchWarehouseId,
            productType: model.SearchProductTypeId > 0 ? (ProductType?)model.SearchProductTypeId : null,
            keywords: model.SearchProductName,
            showHidden: true,
            overridePublished: overridePublished);

        try
        {
            var bytes = await _exportManager.ExportProductsToXlsxAsync(products);

            return File(bytes, MimeTypes.TextXlsx, "products.xlsx");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);

            return RedirectToAction("List");
        }
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> ExportExcelSelected(string selectedIds)
    {
        var products = new List<Product>();
        if (selectedIds != null)
        {
            var ids = selectedIds
                .Split(_separator, StringSplitOptions.RemoveEmptyEntries)
                .Select(x => Convert.ToInt32(x))
                .ToArray();
            products.AddRange(await _productService.GetProductsByIdsAsync(ids));
        }
        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null)
        {
            products = products.Where(p => p.VendorId == currentVendor.Id).ToList();
        }

        try
        {
            var bytes = await _exportManager.ExportProductsToXlsxAsync(products);

            return File(bytes, MimeTypes.TextXlsx, "products.xlsx");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);
            return RedirectToAction("List");
        }
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_IMPORT_EXPORT)]
    public virtual async Task<IActionResult> ImportExcel(IFormFile importexcelfile)
    {
        if (await _workContext.GetCurrentVendorAsync() != null && !_vendorSettings.AllowVendorsToImportProducts)
            //a vendor can not import products
            return AccessDeniedView();

        try
        {
            if (importexcelfile != null && importexcelfile.Length > 0)
            {
                await _importManager.ImportProductsFromXlsxAsync(importexcelfile.OpenReadStream());
            }
            else
            {
                _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("Admin.Common.UploadFile"));

                return RedirectToAction("List");
            }

            _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.Imported"));

            return RedirectToAction("List");
        }
        catch (Exception exc)
        {
            await _notificationService.ErrorNotificationAsync(exc);

            return RedirectToAction("List");
        }
    }

    #endregion

    #region Tier prices

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> TierPriceList(TierPriceSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareTierPriceListModelAsync(searchModel, product);

        return Json(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> TierPriceCreatePopup(int productId)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId)
            ?? throw new ArgumentException("No product found with the specified id");

        //prepare model
        var model = await _productModelFactory.PrepareTierPriceModelAsync(new TierPriceModel(), product, null);

        return View(model);
    }

    [HttpPost]
    [FormValueRequired("save")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> TierPriceCreatePopup(TierPriceModel model)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(model.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        if (ModelState.IsValid)
        {
            //fill entity from model
            var tierPrice = model.ToEntity<TierPrice>();
            tierPrice.ProductId = product.Id;
            tierPrice.CustomerRoleId = model.CustomerRoleId > 0 ? model.CustomerRoleId : (int?)null;

            await _productService.InsertTierPriceAsync(tierPrice);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareTierPriceModelAsync(model, product, null, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> TierPriceEditPopup(int id)
    {
        //try to get a tier price with the specified id
        var tierPrice = await _productService.GetTierPriceByIdAsync(id);
        if (tierPrice == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(tierPrice.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareTierPriceModelAsync(null, product, tierPrice);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> TierPriceEditPopup(TierPriceModel model)
    {
        //try to get a tier price with the specified id
        var tierPrice = await _productService.GetTierPriceByIdAsync(model.Id);
        if (tierPrice == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(tierPrice.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        if (ModelState.IsValid)
        {
            //fill entity from model
            tierPrice = model.ToEntity(tierPrice);
            tierPrice.CustomerRoleId = model.CustomerRoleId > 0 ? model.CustomerRoleId : (int?)null;
            await _productService.UpdateTierPriceAsync(tierPrice);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareTierPriceModelAsync(model, product, tierPrice, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> TierPriceDelete(int id)
    {
        //try to get a tier price with the specified id
        var tierPrice = await _productService.GetTierPriceByIdAsync(id)
            ?? throw new ArgumentException("No tier price found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(tierPrice.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        await _productService.DeleteTierPriceAsync(tierPrice);

        return new NullJsonResult();
    }

    #endregion

    #region Product attributes

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeMappingList(ProductAttributeMappingSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeMappingListModelAsync(searchModel, product);

        return Json(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeMappingCreate(int productId)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("This is not your product"));
            return RedirectToAction("List");
        }

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeMappingModelAsync(new ProductAttributeMappingModel(), product, null);

        return View(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeMappingCreate(ProductAttributeMappingModel model, bool continueEditing)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(model.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("This is not your product"));
            return RedirectToAction("List");
        }

        //ensure this attribute is not mapped yet
        if ((await _productAttributeService.GetProductAttributeMappingsByProductIdAsync(product.Id))
            .Any(x => x.ProductAttributeId == model.ProductAttributeId))
        {
            //redisplay form
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.AlreadyExists"));

            model = await _productModelFactory.PrepareProductAttributeMappingModelAsync(model, product, null, true);

            return View(model);
        }

        //insert mapping
        var productAttributeMapping = model.ToEntity<ProductAttributeMapping>();

        await _productAttributeService.InsertProductAttributeMappingAsync(productAttributeMapping);
        await UpdateLocalesAsync(productAttributeMapping, model);

        //predefined values
        var predefinedValues = await _productAttributeService.GetPredefinedProductAttributeValuesAsync(model.ProductAttributeId);
        foreach (var predefinedValue in predefinedValues)
        {
            var pav = new ProductAttributeValue
            {
                ProductAttributeMappingId = productAttributeMapping.Id,
                AttributeValueType = AttributeValueType.Simple,
                Name = predefinedValue.Name,
                PriceAdjustment = predefinedValue.PriceAdjustment,
                PriceAdjustmentUsePercentage = predefinedValue.PriceAdjustmentUsePercentage,
                WeightAdjustment = predefinedValue.WeightAdjustment,
                Cost = predefinedValue.Cost,
                IsPreSelected = predefinedValue.IsPreSelected,
                DisplayOrder = predefinedValue.DisplayOrder
            };
            await _productAttributeService.InsertProductAttributeValueAsync(pav);

            //locales
            var languages = await _languageService.GetAllLanguagesAsync(true);

            //localization
            foreach (var lang in languages)
            {
                var name = await _localizationService.GetLocalizedAsync(predefinedValue, x => x.Name, lang.Id, false, false);
                if (!string.IsNullOrEmpty(name))
                    await _localizedEntityService.SaveLocalizedValueAsync(pav, x => x.Name, name, lang.Id);
            }
        }

        _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Added"));

        if (!continueEditing)
        {
            //select an appropriate card
            SaveSelectedCardName("product-product-attributes");
            return RedirectToAction("Edit", new { id = product.Id });
        }

        return RedirectToAction("ProductAttributeMappingEdit", new { id = productAttributeMapping.Id });
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeMappingEdit(int id)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(id)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("This is not your product"));
            return RedirectToAction("List");
        }

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeMappingModelAsync(null, product, productAttributeMapping);

        return View(model);
    }

    [HttpPost, ParameterBasedOnFormName("save-continue", "continueEditing")]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeMappingEdit(ProductAttributeMappingModel model, bool continueEditing, IFormCollection form)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(model.Id)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
        {
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("This is not your product"));
            return RedirectToAction("List");
        }

        //ensure this attribute is not mapped yet
        if ((await _productAttributeService.GetProductAttributeMappingsByProductIdAsync(product.Id))
            .Any(x => x.ProductAttributeId == model.ProductAttributeId && x.Id != productAttributeMapping.Id))
        {
            //redisplay form
            _notificationService.ErrorNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.AlreadyExists"));

            model = await _productModelFactory.PrepareProductAttributeMappingModelAsync(model, product, productAttributeMapping, true);

            return View(model);
        }

        //fill entity from model
        productAttributeMapping = model.ToEntity(productAttributeMapping);
        await _productAttributeService.UpdateProductAttributeMappingAsync(productAttributeMapping);

        await UpdateLocalesAsync(productAttributeMapping, model);

        await SaveConditionAttributesAsync(productAttributeMapping, model.ConditionModel, form);

        _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Updated"));

        if (!continueEditing)
        {
            //select an appropriate card
            SaveSelectedCardName("product-product-attributes");
            return RedirectToAction("Edit", new { id = product.Id });
        }

        return RedirectToAction("ProductAttributeMappingEdit", new { id = productAttributeMapping.Id });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeMappingDelete(int id)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(id)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //check if existed combinations contains the specified attribute
        var existedCombinations = await _productAttributeService.GetAllProductAttributeCombinationsAsync(product.Id);
        if (existedCombinations?.Any() == true)
        {
            foreach (var combination in existedCombinations)
            {
                var mappings = await _productAttributeParser
                    .ParseProductAttributeMappingsAsync(combination.AttributesXml);

                if (mappings?.Any(m => m.Id == productAttributeMapping.Id) == true)
                {
                    _notificationService.ErrorNotification(
                        string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.AlreadyExistsInCombination"),
                            await _productAttributeFormatter.FormatAttributesAsync(product, combination.AttributesXml, await _workContext.GetCurrentCustomerAsync(), await _storeContext.GetCurrentStoreAsync(), ", ")));

                    return RedirectToAction("ProductAttributeMappingEdit", new { id = productAttributeMapping.Id });
                }
            }
        }

        await _productAttributeService.DeleteProductAttributeMappingAsync(productAttributeMapping);

        _notificationService.SuccessNotification(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Deleted"));

        //select an appropriate card
        SaveSelectedCardName("product-product-attributes");
        return RedirectToAction("Edit", new { id = productAttributeMapping.ProductId });
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeValueList(ProductAttributeValueSearchModel searchModel)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(searchModel.ProductAttributeMappingId)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeValueListModelAsync(searchModel, productAttributeMapping);

        return Json(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeValueCreatePopup(int productAttributeMappingId)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(productAttributeMappingId)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeValueModelAsync(new ProductAttributeValueModel(), productAttributeMapping, null);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeValueCreatePopup(ProductAttributeValueModel model)
    {
        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(model.ProductAttributeMappingId);
        if (productAttributeMapping == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        if (productAttributeMapping.AttributeControlType == AttributeControlType.ColorSquares)
        {
            //ensure valid color is chosen/entered
            if (string.IsNullOrEmpty(model.ColorSquaresRgb))
                ModelState.AddModelError(string.Empty, "Color is required");
            try
            {
                //ensure color is valid (can be instantiated)
                System.Drawing.ColorTranslator.FromHtml(model.ColorSquaresRgb);
            }
            catch (Exception exc)
            {
                ModelState.AddModelError(string.Empty, exc.Message);
            }
        }

        //ensure a picture is uploaded
        if (productAttributeMapping.AttributeControlType == AttributeControlType.ImageSquares && model.ImageSquaresPictureId == 0)
        {
            ModelState.AddModelError(string.Empty, "Image is required");
        }

        if (ModelState.IsValid)
        {
            //fill entity from model
            var pav = model.ToEntity<ProductAttributeValue>();

            pav.Quantity = model.CustomerEntersQty ? 1 : model.Quantity;

            await _productAttributeService.InsertProductAttributeValueAsync(pav);
            await UpdateLocalesAsync(pav, model);
            await SaveAttributeValuePicturesAsync(product, pav, model);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareProductAttributeValueModelAsync(model, productAttributeMapping, null, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeValueEditPopup(int id)
    {
        //try to get a product attribute value with the specified id
        var productAttributeValue = await _productAttributeService.GetProductAttributeValueByIdAsync(id);
        if (productAttributeValue == null)
            return RedirectToAction("List", "Product");

        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(productAttributeValue.ProductAttributeMappingId);
        if (productAttributeMapping == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeValueModelAsync(null, productAttributeMapping, productAttributeValue);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeValueEditPopup(ProductAttributeValueModel model)
    {
        //try to get a product attribute value with the specified id
        var productAttributeValue = await _productAttributeService.GetProductAttributeValueByIdAsync(model.Id);
        if (productAttributeValue == null)
            return RedirectToAction("List", "Product");

        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(productAttributeValue.ProductAttributeMappingId);
        if (productAttributeMapping == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        if (productAttributeMapping.AttributeControlType == AttributeControlType.ColorSquares)
        {
            //ensure valid color is chosen/entered
            if (string.IsNullOrEmpty(model.ColorSquaresRgb))
                ModelState.AddModelError(string.Empty, "Color is required");
            try
            {
                //ensure color is valid (can be instantiated)
                System.Drawing.ColorTranslator.FromHtml(model.ColorSquaresRgb);
            }
            catch (Exception exc)
            {
                ModelState.AddModelError(string.Empty, exc.Message);
            }
        }

        //ensure a picture is uploaded
        if (productAttributeMapping.AttributeControlType == AttributeControlType.ImageSquares && model.ImageSquaresPictureId == 0)
        {
            ModelState.AddModelError(string.Empty, "Image is required");
        }

        if (ModelState.IsValid)
        {
            //fill entity from model
            productAttributeValue = model.ToEntity(productAttributeValue);
            productAttributeValue.Quantity = model.CustomerEntersQty ? 1 : model.Quantity;
            await _productAttributeService.UpdateProductAttributeValueAsync(productAttributeValue);

            await UpdateLocalesAsync(productAttributeValue, model);
            await SaveAttributeValuePicturesAsync(product, productAttributeValue, model);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareProductAttributeValueModelAsync(model, productAttributeMapping, productAttributeValue, true);

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeValueDelete(int id)
    {
        //try to get a product attribute value with the specified id
        var productAttributeValue = await _productAttributeService.GetProductAttributeValueByIdAsync(id)
            ?? throw new ArgumentException("No product attribute value found with the specified id");

        //try to get a product attribute mapping with the specified id
        var productAttributeMapping = await _productAttributeService.GetProductAttributeMappingByIdAsync(productAttributeValue.ProductAttributeMappingId)
            ?? throw new ArgumentException("No product attribute mapping found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productAttributeMapping.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //check if existed combinations contains the specified attribute value
        var existedCombinations = await _productAttributeService.GetAllProductAttributeCombinationsAsync(product.Id);
        if (existedCombinations?.Any() == true)
        {
            foreach (var combination in existedCombinations)
            {
                var attributeValues = await _productAttributeParser.ParseProductAttributeValuesAsync(combination.AttributesXml);

                if (attributeValues.Where(attribute => attribute.Id == id).Any())
                {
                    return Conflict(string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Values.AlreadyExistsInCombination"),
                        await _productAttributeFormatter.FormatAttributesAsync(product, combination.AttributesXml, await _workContext.GetCurrentCustomerAsync(), await _storeContext.GetCurrentStoreAsync(), ", ")));
                }
            }
        }

        await _productAttributeService.DeleteProductAttributeValueAsync(productAttributeValue);

        return new NullJsonResult();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociateProductToAttributeValuePopup()
    {
        //prepare model
        var model = await _productModelFactory.PrepareAssociateProductToAttributeValueSearchModelAsync(new AssociateProductToAttributeValueSearchModel());

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociateProductToAttributeValuePopupList(AssociateProductToAttributeValueSearchModel searchModel)
    {
        //prepare model
        var model = await _productModelFactory.PrepareAssociateProductToAttributeValueListModelAsync(searchModel);

        return Json(model);
    }

    [HttpPost]
    [FormValueRequired("save")]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> AssociateProductToAttributeValuePopup([Bind(Prefix = nameof(AssociateProductToAttributeValueModel))] AssociateProductToAttributeValueModel model)
    {
        //try to get a product with the specified id
        var associatedProduct = await _productService.GetProductByIdAsync(model.AssociatedToProductId);
        if (associatedProduct == null)
            return Content("Cannot load a product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && associatedProduct.VendorId != currentVendor.Id)
            return Content("This is not your product");

        ViewBag.RefreshPage = true;
        ViewBag.productId = associatedProduct.Id;
        ViewBag.productName = associatedProduct.Name;

        return View(new AssociateProductToAttributeValueSearchModel());
    }

    //action displaying notification (warning) to a store owner when associating some product
    public virtual async Task<IActionResult> AssociatedProductGetWarnings(int productId)
    {
        var associatedProduct = await _productService.GetProductByIdAsync(productId);
        if (associatedProduct == null)
            return Json(new { Result = string.Empty });

        //attributes
        if (await _productAttributeService.GetProductAttributeMappingsByProductIdAsync(associatedProduct.Id) is IList<ProductAttributeMapping> mapping && mapping.Any())
        {
            if (mapping.Any(attribute => attribute.IsRequired))
                return Json(new { Result = await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Values.Fields.AssociatedProduct.HasRequiredAttributes") });

            return Json(new { Result = await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Values.Fields.AssociatedProduct.HasAttributes") });
        }

        //gift card
        if (associatedProduct.IsGiftCard)
        {
            return Json(new { Result = await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Values.Fields.AssociatedProduct.GiftCard") });
        }

        //downloadable product
        if (associatedProduct.IsDownload)
        {
            return Json(new { Result = await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.Attributes.Values.Fields.AssociatedProduct.Downloadable") });
        }

        return Json(new { Result = string.Empty });
    }

    #endregion

    #region Product attribute combinations

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeCombinationList(ProductAttributeCombinationSearchModel searchModel)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeCombinationListModelAsync(searchModel, product);

        return Json(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeCombinationDelete(int id)
    {
        //try to get a combination with the specified id
        var combination = await _productAttributeService.GetProductAttributeCombinationByIdAsync(id)
            ?? throw new ArgumentException("No product attribute combination found with the specified id");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(combination.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        await _productAttributeService.DeleteProductAttributeCombinationAsync(combination);

        return new NullJsonResult();
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeCombinationCreatePopup(int productId)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId);
        if (product == null)
            return RedirectToAction("List", "Product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(new ProductAttributeCombinationModel(), product, null);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_CREATE_EDIT_DELETE)]
    public virtual async Task<IActionResult> ProductAttributeCombinationCreatePopup(int productId, ProductAttributeCombinationModel model, IFormCollection form)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId);
        if (product == null)
            return RedirectToAction("List", "Product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //attributes
        var warnings = new List<string>();
        var attributesXml = await GetAttributesXmlForProductAttributeCombinationAsync(form, warnings, product.Id);

        //check whether the attribute value is specified
        if (string.IsNullOrEmpty(attributesXml))
            warnings.Add(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.Alert.FailedValue"));

        warnings.AddRange(await _shoppingCartService.GetShoppingCartItemAttributeWarningsAsync(await _workContext.GetCurrentCustomerAsync(),
            ShoppingCartType.ShoppingCart, product, 1, attributesXml, true));

        //check whether the same attribute combination already exists
        var existingCombination = await _productAttributeParser.FindProductAttributeCombinationAsync(product, attributesXml);
        if (existingCombination != null)
            warnings.Add(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.AlreadyExists"));

        if (!warnings.Any())
        {
            //save combination
            var combination = model.ToEntity<ProductAttributeCombination>();

            //fill attributes
            combination.AttributesXml = attributesXml;

            await _productAttributeService.InsertProductAttributeCombinationAsync(combination);

            await SaveAttributeCombinationPicturesAsync(product, combination, model);

            //quantity change history
            await _productService.AddStockQuantityHistoryEntryAsync(product, combination.StockQuantity, combination.StockQuantity,
                message: await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.Combination.Edit"), combinationId: combination.Id);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(model, product, null, true);
        model.Warnings = warnings;

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeCombinationGeneratePopup(int productId)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId);
        if (product == null)
            return RedirectToAction("List", "Product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(new ProductAttributeCombinationModel(), product, null);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeCombinationGeneratePopup(IFormCollection form, ProductAttributeCombinationModel model)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(model.ProductId);
        if (product == null)
            return RedirectToAction("List", "Product");

        var allowedAttributeIds = form.Keys.Where(key => key.Contains("attribute_value_"))
            .Select(key => int.TryParse(form[key], out var id) ? id : 0).Where(id => id > 0).ToList();

        var requiredAttributeNames = await (await _productAttributeService.GetProductAttributeMappingsByProductIdAsync(product.Id))
            .Where(pam => pam.IsRequired)
            .Where(pam => !pam.IsNonCombinable())
            .WhereAwait(async pam => !(await _productAttributeService.GetProductAttributeValuesAsync(pam.Id)).Any(v => allowedAttributeIds.Any(id => id == v.Id)))
            .SelectAwait(async pam => (await _productAttributeService.GetProductAttributeByIdAsync(pam.ProductAttributeId)).Name).ToListAsync();

        if (requiredAttributeNames.Any())
        {
            model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(model, product, null, true);
            var pavModels = model.ProductAttributes.SelectMany(pa => pa.Values)
                .Where(v => allowedAttributeIds.Any(id => id == v.Id))
                .ToList();
            foreach (var pavModel in pavModels)
            {
                pavModel.Checked = "checked";
            }

            model.Warnings.Add(string.Format(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.SelectRequiredAttributes"), string.Join(", ", requiredAttributeNames)));

            return View(model);
        }

        await GenerateAttributeCombinationsAsync(product, allowedAttributeIds);

        ViewBag.RefreshPage = true;

        return View(new ProductAttributeCombinationModel());
    }

    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeCombinationEditPopup(int id)
    {
        //try to get a combination with the specified id
        var combination = await _productAttributeService.GetProductAttributeCombinationByIdAsync(id);
        if (combination == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(combination.ProductId);
        if (product == null)
            return RedirectToAction("List", "Product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //prepare model
        var model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(null, product, combination);

        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> ProductAttributeCombinationEditPopup(ProductAttributeCombinationModel model, IFormCollection form)
    {
        //try to get a combination with the specified id
        var combination = await _productAttributeService.GetProductAttributeCombinationByIdAsync(model.Id);
        if (combination == null)
            return RedirectToAction("List", "Product");

        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(combination.ProductId);
        if (product == null)
            return RedirectToAction("List", "Product");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return RedirectToAction("List", "Product");

        //attributes
        var warnings = new List<string>();
        var attributesXml = await GetAttributesXmlForProductAttributeCombinationAsync(form, warnings, product.Id);

        //check whether the attribute value is specified
        if (string.IsNullOrEmpty(attributesXml))
            warnings.Add(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.Alert.FailedValue"));

        warnings.AddRange(await _shoppingCartService.GetShoppingCartItemAttributeWarningsAsync(await _workContext.GetCurrentCustomerAsync(),
            ShoppingCartType.ShoppingCart, product, 1, attributesXml, true));

        //check whether the same attribute combination already exists
        var existingCombination = await _productAttributeParser.FindProductAttributeCombinationAsync(product, attributesXml);
        if (existingCombination != null && existingCombination.Id != model.Id && existingCombination.AttributesXml.Equals(attributesXml))
            warnings.Add(await _localizationService.GetResourceAsync("Admin.Catalog.Products.ProductAttributes.AttributeCombinations.AlreadyExists"));

        if (!warnings.Any() && ModelState.IsValid)
        {
            var previousStockQuantity = combination.StockQuantity;

            //save combination
            //fill entity from model
            combination = model.ToEntity(combination);
            combination.AttributesXml = attributesXml;

            await _productAttributeService.UpdateProductAttributeCombinationAsync(combination);

            await SaveAttributeCombinationPicturesAsync(product, combination, model);

            //quantity change history
            await _productService.AddStockQuantityHistoryEntryAsync(product, combination.StockQuantity - previousStockQuantity, combination.StockQuantity,
                message: await _localizationService.GetResourceAsync("Admin.StockQuantityHistory.Messages.Combination.Edit"), combinationId: combination.Id);

            ViewBag.RefreshPage = true;

            return View(model);
        }

        //prepare model
        model = await _productModelFactory.PrepareProductAttributeCombinationModelAsync(model, product, combination, true);
        model.Warnings = warnings;

        //if we got this far, something failed, redisplay form
        return View(model);
    }

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_CREATE_EDIT_DELETE)]
    [CheckPermission(StandardPermission.Catalog.PRODUCT_ATTRIBUTES_VIEW)]
    public virtual async Task<IActionResult> GenerateAllAttributeCombinations(int productId)
    {
        //try to get a product with the specified id
        var product = await _productService.GetProductByIdAsync(productId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        await GenerateAttributeCombinationsAsync(product);

        return Json(new { Success = true });
    }

    #endregion

    #region Product editor settings

    [HttpPost]
    [CheckPermission(StandardPermission.Configuration.MANAGE_SETTINGS)]
    public virtual async Task<IActionResult> SaveProductEditorSettings(ProductModel model, string returnUrl = "")
    {
        //vendors cannot manage these settings
        if (await _workContext.GetCurrentVendorAsync() != null)
            return RedirectToAction("List");

        var productEditorSettings = await _settingService.LoadSettingAsync<ProductEditorSettings>();
        productEditorSettings = model.ProductEditorSettingsModel.ToSettings(productEditorSettings);
        await _settingService.SaveSettingAsync(productEditorSettings);

        //product list
        if (string.IsNullOrEmpty(returnUrl))
            return RedirectToAction("List");

        //prevent open redirection attack
        if (!Url.IsLocalUrl(returnUrl))
            return RedirectToAction("List");

        return Redirect(returnUrl);
    }

    #endregion

    #region Stock quantity history

    [HttpPost]
    [CheckPermission(StandardPermission.Catalog.PRODUCTS_VIEW)]
    public virtual async Task<IActionResult> StockQuantityHistory(StockQuantityHistorySearchModel searchModel)
    {
        var product = await _productService.GetProductByIdAsync(searchModel.ProductId)
            ?? throw new ArgumentException("No product found with the specified id");

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        if (currentVendor != null && product.VendorId != currentVendor.Id)
            return Content("This is not your product");

        //prepare model
        var model = await _productModelFactory.PrepareStockQuantityHistoryListModelAsync(searchModel, product);

        return Json(model);
    }

    #endregion

    #endregion
}