using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using ThoughtWorks.QRCode.Codec;

namespace WX.CRM.Common
{
    public class QRCodeHelper
    {
        public static QRCodeEncoder.ENCODE_MODE qrCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

        /// <summary>
        /// 大小(值越大生成的二维码图片像素越高)
        /// </summary>
        //public static int qrCodeScale = 4;
        public static int qrCodeScale = 8;

        /// <summary>
        /// 版本(注意：设置为0主要是防止编码的字符串太长时发生错误)
        /// </summary>
        public static int qrCodeVersion = 0;

        /// <summary>
        /// 错误效验、错误更正(有4个等级)
        /// </summary>
        public static QRCodeEncoder.ERROR_CORRECTION qrCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

        /// <summary>
        /// 二维码内容编码方式
        /// </summary>
        //public static System.Text.Encoding encode = System.Text.Encoding.GetEncoding("GB2312");
        public static System.Text.Encoding encode = System.Text.Encoding.UTF8;

        public static byte[] Create(string qrCodeBody)
        {

            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = qrCodeEncodeMode;
            qrCodeEncoder.QRCodeScale = qrCodeScale;
            qrCodeEncoder.QRCodeVersion = qrCodeVersion;
            qrCodeEncoder.QRCodeErrorCorrect = qrCodeErrorCorrect;
            Image image = qrCodeEncoder.Encode(qrCodeBody, encode);
            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Jpeg);
                byte[] buffer = new byte[ms.Length];
                ms.Seek(0, SeekOrigin.Begin);
                ms.Read(buffer, 0, buffer.Length);
                return buffer;
            }
        }

        public static Image CreateImg(string qrCodeBody)
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = qrCodeEncodeMode;
            qrCodeEncoder.QRCodeScale = qrCodeScale;
            qrCodeEncoder.QRCodeVersion = qrCodeVersion;
            qrCodeEncoder.QRCodeErrorCorrect = qrCodeErrorCorrect;
            Image image = qrCodeEncoder.Encode(qrCodeBody, encode);
            return image;
        }

        public static byte[] GetQrCode(string name, string price, string productName, string savePath, string url, string payType)
        {
            var dicPath = Path.Combine(Path.Combine(System.Web.HttpContext.Current.Request.PhysicalApplicationPath, "UploadFile"), "PayQRCode");
            var dituPath = Path.Combine(dicPath, "ditu.png");
            var wxPath = Path.Combine(dicPath, "wx.png");
            var aliPath = Path.Combine(dicPath, "ali.png");
            using (Image imgbig = new Bitmap(dituPath))
            {
                using (Graphics g = Graphics.FromImage(imgbig))
                {
                    var name_font = new Font("微软雅黑", 30, FontStyle.Bold);
                    g.DrawString(name, name_font, Brushes.Black, 40, 80);

                    var productName_font = new Font("微软雅黑", 40, FontStyle.Bold);
                    //var productName_format = new StringFormat{ Alignment = StringAlignment.Center };
                    SizeF productName_size = g.MeasureString(productName, productName_font);
                    var productName_x = (imgbig.Width - productName_size.Width) / 2;
                    //var productName_y = (imgbig.Width - productName_size.Height) / 2;
                    var productName_y = 165;
                    g.DrawString(productName, productName_font, Brushes.Orange, productName_x, productName_y);

                    var price_font = new Font("微软雅黑", 40, FontStyle.Bold);
                    SizeF price_size = g.MeasureString(price, price_font);
                    var price_x = (imgbig.Width - price_size.Width) / 2;
                    //var productName_y = (imgbig.Width - productName_size.Height) / 2;
                    var price_y = 235;
                    g.DrawString(price, price_font, Brushes.Black, price_x, price_y);

                    //二维码
                    var ssImg = string.Empty;
                    if (payType == "ali")
                    {
                        ssImg = aliPath;
                    }
                    else
                    {
                        ssImg = wxPath;
                    }
                    var img = CombinImage(CreateImg(url), ssImg);

                    //计算图片大小
                    float w = imgbig.Width / 4;

                    float pw = w / (img.Width * (float)0.45);
                    float ph = w / (img.Height * (float)0.45);
                    if (pw > ph)
                    {
                        pw = ph;
                    }

                    int mw = (int)(pw * img.Width);
                    int mh = (int)(pw * img.Height);

                    //计算图片在二维上的x,y坐标
                    int x = (imgbig.Width - mw) / 2;
                    int y = (imgbig.Height - mh) / 2 + 60;

                    g.DrawImage(img, x, y, mw, mh);
                }

                imgbig.Save(savePath);

                using (MemoryStream ms = new MemoryStream())
                {
                    imgbig.Save(ms, ImageFormat.Jpeg);
                    byte[] buffer = new byte[ms.Length];
                    ms.Seek(0, SeekOrigin.Begin);
                    ms.Read(buffer, 0, buffer.Length);
                    return buffer;
                }
            }
        }


        /// <summary>    
        /// 调用此函数后使此两种图片合并，类似相册，有个    
        /// 背景图，中间贴自己的目标图片    
        /// </summary>    
        /// <param name="imgBack">粘贴的源图片</param>    
        /// <param name="destImg">粘贴的目标图片</param>    
        public static Image CombinImage(Image imgBack, string destImg)
        {
            Image img = Image.FromFile(destImg);        //照片图片      
            if (img.Height != 65 || img.Width != 65)
            {
                img = KiResizeImage(img, 65, 65, 0);
            }
            Graphics g = Graphics.FromImage(imgBack);

            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);     

            //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框    

            //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);    

            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
            GC.Collect();
            return imgBack;
        }


        /// <summary>    
                /// Resize图片    
                /// </summary>    
                /// <param name="bmp">原始Bitmap</param>    
                /// <param name="newW">新的宽度</param>    
                /// <param name="newH">新的高度</param>    
                /// <param name="Mode">保留着，暂时未用</param>    
                /// <returns>处理以后的图片</returns>    
        public static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
        {
            try
            {
                Image b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);
                // 插值算法的质量    
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch
            {
                return null;
            }
        }
    }
}