using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
using ZXing;

namespace AllBase
{
    public class ImageCut
    {
        /// <summary>
        /// 正方型裁剪
        /// 以图片中心为轴心，截取正方型，然后等比缩放
        /// 用于头像处理
        /// </summary>
        /// <remarks>吴剑 2010-11-23</remarks>
        /// <param name="path">原图HttpPostedFile对象</param>
        /// <param name="fileSaveUrl">缩略图存放地址</param>
        /// <param name="side">指定的边长（正方型）</param>
        /// <param name="quality">质量（范围0-100）</param>
        public static void CutForSquare(string path, string fileSaveUrl, int side, int quality, out int width,
            out int height)
        {

            string exe = path.Split('.')[path.Split('.').Length - 1].ToLower();
            Image initImage = null;
            width = 0;
            height = 0;
            try
            {
                FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
                initImage = Image.FromStream(fileStream);
                fileStream.Close();
                fileStream.Dispose();
            }
            catch (Exception e)
            {
                LogSave.Add(e.Message);
                return;
            }
            width = initImage.Width;
            height = initImage.Height;
            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= side || initImage.Height <= side)
            {
                return;
                //initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
            }

            //关键质量控制
            //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
            ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo ici = null, defCodecInfo = null;
            foreach (ImageCodecInfo i in icis)
            {
                if (i.MimeType == "image/jpeg")
                    defCodecInfo = i;
                if ((exe == "jpg" || exe == "jpeg") && i.MimeType == "image/jpeg")
                {
                    ici = i;
                }
                if (exe == "bmp" && i.MimeType == "image/bmp")
                {
                    ici = i;
                }
                if (exe == "png" && i.MimeType == "image/png")
                {
                    ici = i;
                }
                if (exe == "gif" && i.MimeType == "image/gif")
                {
                    ici = i;
                }
            }
            if (ici == null)
                ici = defCodecInfo;
            EncoderParameters ep = new EncoderParameters(1);
            ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);


            //原始图片的宽、高
            int initWidth = initImage.Width;
            int initHeight = initImage.Height;
            int sizeW = 50, sizeH = 50;
            if (initWidth > initHeight)
                sizeW = 70;
            else
                sizeH = 70;
            width = initWidth - sizeW * 2;
            height = initHeight - sizeH * 2;

            //FileBase.Delete(path);
            Image pickedImage = new Bitmap(width, height);
            Graphics pickedG = Graphics.FromImage(pickedImage);
            pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;
            pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
            //定位
            Rectangle fromR = new Rectangle(sizeW - 20, sizeH, width, height);
            Rectangle toR = new Rectangle(0, 0, width, height);
            //画图
            pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
            //将截图对象赋给原图
            Image initImagex = (System.Drawing.Image)pickedImage.Clone();
            //释放截图资源
            pickedG.Dispose();
            pickedImage.Dispose();
            initImage.Clone();
            initImage.Dispose();
            try
            {
                initImagex.Save(fileSaveUrl, ici, ep);
            }
            catch (Exception e)
            {
                LogSave.Add(e.Message);
            }
            //释放关键质量控制所用资源
            ep.Dispose();

        }

        /// <summary>
        /// 是否二维码
        /// </summary>
        /// <param name="strSavePath"></param>
        /// <returns></returns>
        public static bool GetErWeiMa(string strSavePath)
        {
            BarcodeReader reader = new BarcodeReader();
            FileStream fileStream = new FileStream(strSavePath, FileMode.Open, FileAccess.Read);
            try
            {
                Image initImage = Image.FromStream(fileStream);
                fileStream.Close();
                fileStream.Dispose();
                if (initImage.Width < 10 || initImage.Height < 10)
                    return false;

                Result result = reader.Decode((Bitmap)initImage);
                if (result == null || string.IsNullOrEmpty(result.Text))
                    return false;
            }
            catch
            {
                return false;
            }
            FileBase.Delete(strSavePath);
            return true;
            //return result.Text;
        }

        /// <summary>
        /// 是否二维码
        /// </summary>
        /// <param name="strSavePath"></param>
        /// <returns></returns>
        public static bool GetErWeiMa(byte[] file, out int width, out int height)
        {

            width = 0;
            height = 0;
            try
            {
                MemoryStream ms = new MemoryStream(file);
                Image initImage = Image.FromStream(ms);
                ms.Close();
                width = initImage.Width;
                height = initImage.Height;
                if (initImage.Width < 10 || initImage.Height < 10)
                {
                    initImage = null;
                    return false;
                }

                BarcodeReader reader = new BarcodeReader();
                Result result = reader.Decode((Bitmap)initImage);
                if (result == null || string.IsNullOrEmpty(result.Text))
                {
                    reader = null;
                    result = null;
                    initImage = null;
                    return false;
                }
                reader = null;
                result = null;
                initImage = null;
            }
            catch
            {
                return false;
            }
            return true;
            //return result.Text;
        }


        /// <summary>
        /// 正方型裁剪
        /// 以图片中心为轴心，截取正方型，然后等比缩放
        /// 用于头像处理
        /// </summary>
        /// <remarks>吴剑 2010-11-23</remarks>
        /// <param name="postedFile">原图HttpPostedFile对象</param>
        /// <param name="fileSaveUrl">缩略图存放地址</param>
        /// <param name="side">指定的边长（正方型）</param>
        /// <param name="quality">质量（范围0-100）</param>
        public static void CutForSquare(System.IO.Stream fromFile, string fileSaveUrl, int side, int quality)
        {
            //创建目录
            string dir = Path.GetDirectoryName(fileSaveUrl);
            if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);

            //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
            System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);

            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= side && initImage.Height <= side)
            {
                initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            else
            {
                //原始图片的宽、高
                int initWidth = initImage.Width;
                int initHeight = initImage.Height;

                //非正方型先裁剪为正方型
                if (initWidth != initHeight)
                {
                    //截图对象
                    System.Drawing.Image pickedImage = null;
                    System.Drawing.Graphics pickedG = null;

                    //宽大于高的横图
                    if (initWidth > initHeight)
                    {
                        //对象实例化
                        pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);
                        //设置质量
                        pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                        //定位
                        Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
                        Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
                        //画图
                        pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
                        //重置宽
                        initWidth = initHeight;
                    }
                    //高大于宽的竖图
                    else
                    {
                        //对象实例化
                        pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);
                        //设置质量
                        pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                        //定位
                        Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
                        Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
                        //画图
                        pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
                        //重置高
                        initHeight = initWidth;
                    }

                    //将截图对象赋给原图
                    initImage = (System.Drawing.Image)pickedImage.Clone();
                    //释放截图资源
                    pickedG.Dispose();
                    pickedImage.Dispose();
                }

                //缩略图对象
                System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side);
                System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);
                //设置质量
                resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                //用指定背景色清空画布
                resultG.Clear(Color.White);
                //绘制缩略图
                resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);

                //关键质量控制
                //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
                ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo i in icis)
                {
                    if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
                    {
                        ici = i;
                    }
                }
                EncoderParameters ep = new EncoderParameters(1);
                ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);

                //保存缩略图
                resultImage.Save(fileSaveUrl, ici, ep);

                //释放关键质量控制所用资源
                ep.Dispose();

                //释放缩略图资源
                resultG.Dispose();
                resultImage.Dispose();

                //释放原始图片资源
                initImage.Dispose();
            }
        }




        /// <summary>
        /// 判断文件类型是否为WEB格式图片
        /// (注：JPG,GIF,BMP,PNG)
        /// </summary>
        /// <param name="contentType">HttpPostedFile.ContentType</param>
        /// <returns></returns>
        public static bool IsWebImage(string contentType)
        {
            if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 压缩图片获得图片MD5 32位指纹
        /// </summary>
        /// <param name="imgToResize"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public static long ResizeImage(Image imgToResize, int width, int height)
        {
            try
            {
                int sourceWidth = imgToResize.Width;
                int sourceHeight = imgToResize.Height;
                float nPercent = 0;
                float nPercentW = 0;
                float nPercentH = 0;
                nPercentW = ((float)width / (float)sourceWidth);
                nPercentH = ((float)height / (float)sourceHeight);
                if (nPercentH < nPercentW)
                    nPercent = nPercentH;
                else
                    nPercent = nPercentW;
                int destWidth = (int)(sourceWidth * nPercent);
                int destHeight = (int)(sourceHeight * nPercent);
                Bitmap b = new Bitmap(destWidth, destHeight);
                Graphics g = Graphics.FromImage(b);
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
                g.Dispose();
                imgToResize.Dispose();
                long md5 = ToGray(ref b,  width,  height);
                return md5;
            }
            catch (Exception e)
            {
                LogSave.Add("计算图片指纹失败："+e.Message);
                return 0;
            }
        }

        /// <summary>
        /// 图像灰度化，并计算指纹
        /// </summary>
        /// <param name="bmp"></param>
        /// <returns></returns>
        public static long ToGray(ref Bitmap bmp, int width, int height)
        {
            byte[] b = new byte[width * height];
            for (int i = 0; i < bmp.Width; i++)
            {
                for (int j = 0; j < bmp.Height; j++)
                {
                    Color color = bmp.GetPixel(i, j);
                    int gray = (int)(color.R * 0.3 + color.G * 0.59 + color.B * 0.11);
                    gray = gray / 16;
                    b[i * bmp.Width + j] = (byte)gray;
                }
            }
            return BaseClass.GetLong(b);
        }

        /// <summary>
        /// 处理图片(四边裁剪+水印)
        /// </summary>
        /// <param name="bytesOld"></param>
        /// <param name="sWaterMark"></param>
        /// <returns></returns>
        public static void HandleImage(ref byte[] bytesOld,bool flag)
        {
            try
            {
            Image img = BytesToImage(ref bytesOld);
            int iniWidth = img.Width;
            int iniHeight = img.Height;

            Random random = new Random();
         
            int cutPixl = random.Next(1, 50); //左边切除的像素
            int cutPixr = random.Next(1, 50); //右边切除的像素
            int cutPixt = random.Next(1, 50); //顶部切除的像素
            int cutPixb = random.Next(1, 50); //底部切除的像素

            if (!flag)
            {
               cutPixl = 0; //左边切除的像素
               cutPixr = 0; //右边切除的像素
               cutPixt = 0; //顶部切除的像素
               cutPixb = 0; //底部切除的像素
             }
           
            Bitmap bitmap = CutImage(ref bytesOld, cutPixl, cutPixr, iniWidth - cutPixl - cutPixt, iniHeight - cutPixr - cutPixb);
            if(bitmap==null)
                return;
            MemoryStream ms = new MemoryStream();
            ImageCodecInfo icc = GetEncoderInfo("image/jpeg");
            EncoderParameters ep = new EncoderParameters(1)
            {
                Param = { [0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 75l) }
            };
            bitmap.Save(ms, icc, ep);
            bytesOld = ms.ToArray();
            }
            catch
            {
            }
        }

        /// <summary>
        /// 字节数组转换为图片
        /// </summary>
        /// <param name="buffer">字节数组</param>
        /// <returns>图片</returns>
        public static Image BytesToImage(ref byte[] buffer)
        {
            var ms = new MemoryStream(buffer, 0, buffer.Length);
            return Image.FromStream(ms);
        }

        /// <summary>
        /// 裁剪图片四边
        /// </summary>
        /// <param name="bytes">原始图片字节流</param>
        /// <param name="iStartX">裁剪开始x坐标</param>
        /// <param name="iStartY">裁剪开始y坐标</param>
        /// <param name="iWidth">裁剪宽度</param>
        /// <param name="iHeight">裁剪高度</param>
        /// <returns></returns>
        public static Bitmap CutImage(ref byte[] bytes, int iStartX, int iStartY, int iWidth, int iHeight)
        {
            try
            {
                Image image = BytesToImage(ref bytes);
                Bitmap b = new Bitmap(image);
                if (bytes == null) return null;
                Bitmap bmpOut = new Bitmap(iWidth, iHeight, PixelFormat.Format24bppRgb);
                Graphics g = Graphics.FromImage(bmpOut);
                g.DrawImage(b, new Rectangle(0, 0, iWidth, iHeight), new Rectangle(iStartX, iStartY, iWidth, iHeight), GraphicsUnit.Pixel);
                g.Dispose();
                return bmpOut;
            }
            catch
            {
                return null;
            }
        }

        public static ImageCodecInfo GetEncoderInfo(string mimeType)
        {
            int j;
            ImageCodecInfo[] encoders;
            encoders = ImageCodecInfo.GetImageEncoders();
            for (j = 0; j < encoders.Length; ++j)
            {
                if (encoders[j].MimeType == mimeType)
                    return encoders[j];
            }
            return null;
        }
    }
}