using Store.Product.Models.Product.Image;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Store.Product.Models.Product
{
    /// <summary>
    /// 商品详情
    /// </summary>
    public class ProductContent
    {
        /// <summary>
        /// 备份数据
        /// </summary>
        private string _backcontent = "";
        public ProductContent(string content)
        {
            _backcontent = content;
            _content = content;
            ConvertContent();
        }


        private string _content = "";
        public override string ToString()
        {
            return GetContent();
        }
        
        /// <summary>
        /// 详情图片集合
        /// </summary>
        public List<ContentImage> Images { get; } = new List<ContentImage>();

        /// <summary>
        /// 删除详情图片
        /// </summary>
        /// <param name="image"></param>
        public void DelImage(ContentImage image)
        {
            var item = Images.FirstOrDefault(a => a.Gid == image.Gid);
            if (item != null)
            {
                string value = GetImgTag(item);
                _content.Replace(value, "");
                Images.Remove(item);
            }
        }

        private void ConvertContent()
        {
            Regex regImg = new Regex(@"<img\b[^>]*?\bsrc[\s]*=[\s]*[""']?[\s]*(?<imgUrl>[^""'>]*)[^>]*?/?[\s]*>");
            if (regImg.IsMatch(_backcontent))
            {
                MatchCollection matchs = regImg.Matches(_backcontent);
                int MatchMax = matchs.Count;
                for (int i = MatchMax - 1; i >=0; i--)
                {
                    Match item = matchs[i];
                    if (item.Success)
                    {
                        Group urlgroup = item.Groups["imgUrl"];
                        if (urlgroup.Success)
                        {
                            var cimg = new ContentImage(urlgroup.Value);
                            Images.Add(cimg);

                            _content = _content.Remove(item.Index, item.Length);
                            _content = _content.Insert(item.Index, GetImgTag(cimg));
                        }
                    }
                }
            }
        }

        private string GetContent()
        {
            var tempContent = _content;
            foreach (var item in Images)
            {
                string value = GetImgTag(item);
                string imgString = $"<img src=\"{item.UploadImgUrl}\" width=\"100%\"  />";
                tempContent = tempContent.Replace(value, imgString);
            }
            return tempContent;
        }
        /// <summary>
        /// 图片标记
        /// </summary>
        /// <param name="img"></param>
        /// <returns></returns>
        private string GetImgTag(ContentImage img)
        {
            return "${" + img.Gid + "}";
        }
    }
}