using System;
using System.Collections.Generic;
using System.Configuration;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ZWL.Common
{
    public class ImgUtil
    {
        #region  base64转换为图片并返回图片路径
        public static string ConvertImg(string strBase)
        {
            var base64 = strBase.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "").Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");//将base64头部信息替换
            byte[] bytes = Convert.FromBase64String(base64);
            MemoryStream memStream = new MemoryStream(bytes);
            Image mImage = Image.FromStream(memStream);
            //Bitmap bp = new Bitmap(mImage);
            Bitmap bp = PercentImage(mImage);
            MemoryStream ms = new MemoryStream();
            string strPhotoPath = ConfigurationManager.AppSettings["Photo"].ToString();
            if (!Directory.Exists(strPhotoPath))
            {
                DirectoryInfo directoryInfo = new DirectoryInfo(strPhotoPath);
                directoryInfo.Create();
            }
            strPhotoPath += "\\" + Guid.NewGuid().ToString() + ".jpg";
            bp.Save(strPhotoPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            return strPhotoPath;
        }

        /// <summary>
        /// 压缩图片，宽度最大为1200
        /// 2023-11-29 xulu
        /// </summary>
        /// <param name="srcImage"></param>
        /// <returns></returns>
        public static Bitmap PercentImage(System.Drawing.Image srcImage)
        {
            int newW = srcImage.Width < 1200 ? srcImage.Width : 1200;
            int newH = int.Parse(Math.Round(srcImage.Height * (double)newW / srcImage.Width).ToString());
            try
            {
                Bitmap b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
                g.DrawImage(srcImage, new System.Drawing.Rectangle(0, 0, newW, newH), new System.Drawing.Rectangle(0, 0, srcImage.Width, srcImage.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch (Exception)
            {
                return null;
            }
        }
        #endregion
        #region 图片文件转base64
        public static string DocumentToBase64Str(string fileName)
        {
            try
            {
                FileStream filestream = new FileStream(fileName, FileMode.Open);
                byte[] bt = new byte[filestream.Length];
                //调用read读取方法
                filestream.Read(bt, 0, bt.Length);
                string base64Str = Convert.ToBase64String(bt);
                filestream.Close();
                return base64Str;
            }
            catch (Exception ex)
            {
                return "";
            }

        }
        #endregion
    }
}