using Google.Cloud.BigQuery.V2;

namespace OSAFeedXML
{
    public interface IBigQuery
    {
        dynamic GetDataBigQuery(List<Destinations> destinations, bool withoutbg = false);
    }

    public enum Destinations
    {
        google = 0,
        facebook = 1
    }

    internal enum PublicationStatus
    {
        HIDDEN = 1,
        OFFLINE_OFFER = 2,
        UNAVAILABLE = 3,
        TEMPORARILY_UNAVAILABLE = 4,
        SALE_IN_EC = 5,
        PRESALE_IN_EC = 6
    }

    internal enum PriceConversion
    {
        NOT_CONVERTION = 0,
        CONVERTION = 1
    }

    internal class GoogleBigQuery : IBigQuery
    {
        private readonly BigQueryClient bigqueryClient;
        private readonly string DomainRedirect;
        private readonly string GoogleProjectId, GoogleDatabase;

        public GoogleBigQuery(BigQueryClient bigQueryClient)
        {
            GoogleProjectId = Environment.GetEnvironmentVariable("GOOGLE_PROJECT_ID") ?? throw new Exception("Brak identyfikatora projektu Google.");
            GoogleDatabase = Environment.GetEnvironmentVariable("GOOGLE_DATABASE") ?? throw new Exception("Brak nazwy bazy danych Google.");
            DomainRedirect = Environment.GetEnvironmentVariable("DOMAIN_REDIRECT") ?? throw new Exception("Brak domeny przekierowania.");
            
            this.bigqueryClient = bigQueryClient;
        }

        public dynamic GetDataBigQuery(List<Destinations> Destinations, bool WithoutBg = false)
        {
            var status = new List<PublicationStatus>() { PublicationStatus.SALE_IN_EC, PublicationStatus.PRESALE_IN_EC };
            string sql = @$"
                SELECT 
                    bon_gid AS id, 
                    bon_ec_name AS title, 
                    bon_seo_description AS description, 
                    CONCAT('{DomainRedirect}/produkt/', bon_slug_url, '--s-', bon_gid) AS link, 
                    CASE WHEN {WithoutBg} THEN ic.bon_url ELSE bn.bon_url END AS image_link, 
                    CASE 
                        WHEN bon_warehouse_state_central IS NULL OR bon_warehouse_state_central = 0 THEN 'out_of_stock' 
                        WHEN NOT EXISTS (
                            SELECT 1
                            FROM UNNEST(bon_marketplace) AS marketplace_value
                            WHERE marketplace_value IN UNNEST([{string.Join(", ", Destinations.Select(dest => (int)dest))}])
                        ) OR bon_ecommerce_status NOT IN ({string.Join(", ", status.Select(stat => (int)stat))}) THEN 'out_of_stock'
                        ELSE 'in_stock' 
                    END AS availability, 
                    ROUND((bon_cash_price * (CASE WHEN bon_price_for = {(int)PriceConversion.CONVERTION} THEN bon_converter ELSE 1 END) * ((100 + bon_vat_rate) / 100)), 2) AS price, 
                    bon_category_path AS product_type, 
                    bon_name AS brand, 
                    bon_ean AS gtin, 
                    bon_index AS mpn,
                    osa_gmc_id AS google_product_category
                FROM `{GoogleProjectId}.{GoogleDatabase}.bon_main_product` bn
                { (WithoutBg ? $"JOIN `{GoogleProjectId}.{GoogleDatabase}.images_clearbg` ic ON bn.bon_commodity_indexid = ic.bon_commodity_indexid" : "JOIN (SELECT '1' AS bon_url) AS ic ON ic.bon_url = '1'") }
            ";

            BigQueryResults results = bigqueryClient.ExecuteQuery(sql, null);

            return results;
        }
    }
}