using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
using Nop.Web.Framework.Extensions;
using Nop.Web.Framework.Models;

namespace Nop.Web.Framework.TagHelpers.Admin
{
    /// <summary>
    /// "nop-action-confirmation" tag helper
    /// </summary>
    [HtmlTargetElement("nop-action-confirmation", Attributes = BUTTON_ID_ATTRIBUTE_NAME, TagStructure = TagStructure.WithoutEndTag)]
    public class NopActionConfirmationTagHelper : TagHelper
    {
        #region Constants

        private const string BUTTON_ID_ATTRIBUTE_NAME = "asp-button-id";
        private const string ACTION_ATTRIBUTE_NAME = "asp-action";
        private const string ADDITIONA_CONFIRM_TEXT = "asp-additional-confirm";

        #endregion

        #region Properties

        protected IHtmlGenerator Generator { get; set; }

        /// <summary>
        /// Button identifier
        /// </summary>
        [HtmlAttributeName(BUTTON_ID_ATTRIBUTE_NAME)]
        public string ButtonId { get; set; }

        /// <summary>
        /// Delete action name
        /// </summary>
        [HtmlAttributeName(ACTION_ATTRIBUTE_NAME)]
        public string Action { get; set; }

        /// <summary>
        /// Additional confirm text
        /// </summary>
        [HtmlAttributeName(ADDITIONA_CONFIRM_TEXT)]
        public string ConfirmText { get; set; }

        /// <summary>
        /// ViewContext
        /// </summary>
        [HtmlAttributeNotBound]
        [ViewContext]
        public ViewContext ViewContext { get; set; }

        #endregion

        #region Fields

        private readonly IHtmlHelper _htmlHelper;

        #endregion

        #region Ctor

        public NopActionConfirmationTagHelper(IHtmlGenerator generator, IHtmlHelper htmlHelper)
        {
            Generator = generator;
            _htmlHelper = htmlHelper;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Asynchronously executes the tag helper with the given context and output
        /// </summary>
        /// <param name="context">Contains information associated with the current HTML tag</param>
        /// <param name="output">A stateful HTML element used to generate an HTML tag</param>
        /// <returns>A task that represents the asynchronous operation</returns>
        public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
        {
            if (context == null)
                throw new ArgumentNullException(nameof(context));

            if (output == null)
                throw new ArgumentNullException(nameof(output));

            //contextualize IHtmlHelper
            var viewContextAware = _htmlHelper as IViewContextAware;
            viewContextAware?.Contextualize(ViewContext);

            if (string.IsNullOrEmpty(Action))
                Action = _htmlHelper.ViewContext.RouteData.Values["action"].ToString();

            var modalId = await new HtmlString(ButtonId + "-action-confirmation").RenderHtmlContentAsync();

            var actionConfirmationModel = new ActionConfirmationModel()
            {
                ControllerName = _htmlHelper.ViewContext.RouteData.Values["controller"].ToString(),
                ActionName = Action,
                WindowId = modalId,
                AdditonalConfirmText = ConfirmText
            };

            //tag details
            output.TagName = "div";
            output.TagMode = TagMode.StartTagAndEndTag;

            output.Attributes.Add("id", modalId);
            output.Attributes.Add("class", "modal fade");
            output.Attributes.Add("tabindex", "-1");
            output.Attributes.Add("role", "dialog");
            output.Attributes.Add("aria-labelledby", $"{modalId}-title");

            var partialView = await _htmlHelper.PartialAsync("Confirm", actionConfirmationModel);
            output.Content.SetHtmlContent(partialView);

            //modal script
            var script = new TagBuilder("script");
            script.InnerHtml.AppendHtml(
                "$(document).ready(function () {" +
                    $"$('#{ButtonId}').attr(\"data-toggle\", \"modal\").attr(\"data-target\", \"#{modalId}\");" +
                    $"$('#{modalId}-submit-button').attr(\"name\", $(\"#{ButtonId}\").attr(\"name\"));" +
                    $"$(\"#{ButtonId}\").attr(\"name\", \"\");" +
                    $"if($(\"#{ButtonId}\").attr(\"type\") == \"submit\")$(\"#{ButtonId}\").attr(\"type\", \"button\");" +
                "});");
            var scriptTag = await script.RenderHtmlContentAsync();
            output.PostContent.SetHtmlContent(scriptTag);
        }

        #endregion
    }
}