using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.UI.HtmlControls;

namespace RMYY_CallCenter_Api.Utility
{
    public class ImageHelper
    {
        #region 私有成员
        private int _Error = 0;//返回上传状态。 
        private int _MaxSize = 20 * 1024 * 1024;//最大单个上传文件 (默认)
        private string _FileType = "jpg;gif;bmp;png";//所支持的上传类型用"/"隔开 
        private string _SavePath = System.Web.HttpContext.Current.Server.MapPath(".") + "\\";//保存文件的实际路径 
        private int _SaveType = 0;//上传文件的类型，0代表自动生成文件名 
        private HtmlInputFile _FormFile;//上传控件。 
        private string _DataUrl;//base64编码的文本
        private string _InFileName = "";//非自动生成文件名设置。 
        private string _OutFileName = "";//输出文件名。 
        private bool _IsCreateImg = true;//是否生成缩略图。 
        private bool _Iss = false;//是否有缩略图生成.
        private int _Height = 0;//获取上传图片的高度 
        private int _Width = 0;//获取上传图片的宽度 
        private int _sHeight = 120;//设置生成缩略图的高度 
        private int _sWidth = 120;//设置生成缩略图的宽度

        private int _DrawString_x = 10;//绘制文本的Ｘ坐标（左上角）
        private int _DrawString_y = 10;//绘制文本的Ｙ坐标（左上角）
        private int _FileSize = 0;//获取已经上传文件的大小
        #endregion

        #region 公有属性
        /// <summary>
        /// Error返回值
        /// 1、没有上传的文件
        /// 2、类型不允许
        /// 3、大小超限
        /// 4、未知错误
        /// 0、上传成功。 
        /// </summary>
        public int Error
        {
            get { return _Error; }
        }

        /// <summary>
        /// 最大单个上传文件
        /// </summary>
        public int MaxSize
        {
            set { _MaxSize = value; }
        }

        /// <summary>
        /// 所支持的上传类型用";"隔开 
        /// </summary>
        public string FileType
        {
            set { _FileType = value; }
        }

        /// <summary>
        /// 保存文件的实际路径 
        /// </summary>
        public string SavePath
        {
            set { _SavePath = System.Web.HttpContext.Current.Server.MapPath(value); }
            get { return _SavePath; }
        }

        /// <summary>
        /// 上传文件的类型，0代表自动生成文件名
        /// </summary>
        public int SaveType
        {
            set { _SaveType = value; }
        }

        /// <summary>
        /// base64编码的文本
        /// </summary>
        public string DataUrl
        {
            set { _DataUrl = value; }
        }

        /// <summary>
        /// 非自动生成文件名设置。
        /// </summary>
        public string InFileName
        {
            set { _InFileName = value; }
        }

        /// <summary>
        /// 输出文件名
        /// </summary>
        public string OutFileName
        {
            get { return _OutFileName; }
            set { _OutFileName = value; }
        }

        /// <summary>
        /// 输出的缩略图文件名
        /// </summary>
        public string OutThumbFileName
        {
            get;
            set;
        }

        /// <summary>
        /// 是否有缩略图生成.
        /// </summary>
        public bool Iss
        {
            get { return _Iss; }
        }

        /// <summary>
        /// 获取上传图片的宽度
        /// </summary>
        public int Width
        {
            get { return _Width; }
        }

        /// <summary>
        /// 获取上传图片的高度
        /// </summary>
        public int Height
        {
            get { return _Height; }
        }

        /// <summary>
        /// 设置缩略图的宽度
        /// </summary>
        public int sWidth
        {
            get { return _sWidth; }
            set { _sWidth = value; }
        }

        /// <summary>
        /// 设置缩略图的高度
        /// </summary>
        public int sHeight
        {
            get { return _sHeight; }
            set { _sHeight = value; }
        }

        /// <summary>
        /// 是否生成缩略图
        /// </summary>
        public bool IsCreateImg
        {
            get { return _IsCreateImg; }
            set { _IsCreateImg = value; }
        }

        /// <summary>
        /// 绘制文本的Ｘ坐标（左上角）
        /// </summary>
        public int DrawString_x
        {
            get { return _DrawString_x; }
            set { _DrawString_x = value; }
        }

        /// <summary>
        /// 绘制文本的Ｙ坐标（左上角）
        /// </summary>
        public int DrawString_y
        {
            get { return _DrawString_y; }
            set { _DrawString_y = value; }
        }

        /// <summary>
        /// 文件大小
        /// </summary>
        public int FileSize
        {
            get { return _FileSize; }
            set { _FileSize = value; }
        }

        public HttpPostedFileBase PostFile { get; set; }
        #endregion

        #region 私有方法
        /// <summary>
        /// 获取文件的后缀名 
        /// </summary>
        private string GetExt(string path)
        {
            return Path.GetExtension(path);
        }

        /// <summary>
        /// 获取输出文件的文件名
        /// </summary>
        private string FileName(string Ext)
        {
            if (_SaveType == 0 || _InFileName.Trim() == "")
                return "(" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ")" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + Ext;
            else
                return "(" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ")" + _InFileName;
        }

        /// <summary>
        /// 检查上传的文件的类型，是否允许上传。
        /// </summary>
        private bool IsUpload(string Ext)
        {
            Ext = Ext.Replace(".", "");
            bool b = false;
            string[] arrFileType = _FileType.Split(';');
            foreach (string str in arrFileType)
            {
                if (str.ToLower() == Ext.ToLower())
                {
                    b = true;
                    break;
                }
            }
            return b;
        }
        #endregion

        #region 上传图片
        public void Upload()
        {
            HttpPostedFileBase hpFile = PostFile;
            if (hpFile == null || hpFile.FileName.Trim() == "")
            {
                _Error = 1;
                return;
            }
            string Ext = GetExt(hpFile.FileName);
            if (!IsUpload(Ext))
            {
                _Error = 2;
                return;
            }
            int iLen = hpFile.ContentLength;
            if (iLen > _MaxSize)
            {
                _Error = 3;
                return;
            }
            try
            {
                if (!Directory.Exists(_SavePath)) Directory.CreateDirectory(_SavePath);
                byte[] bData = new byte[iLen];
                hpFile.InputStream.Read(bData, 0, iLen);
                string FName;
                FName = FileName(Ext);
                string TempFile = FName;
                FileStream newFile = new FileStream(_SavePath + TempFile, FileMode.Create);
                newFile.Write(bData, 0, bData.Length);
                newFile.Flush();
                int _FileSizeTemp = hpFile.ContentLength;

                string ImageFilePath = _SavePath + FName;

                //获取图片的高度和宽度
                System.Drawing.Image Img = System.Drawing.Image.FromStream(newFile);
                _Width = Img.Width;
                _Height = Img.Height;

                //生成缩略图部分 
                if (_IsCreateImg)
                {
                    #region 缩略图大小只设置了最大范围，并不是实际大小
                    float realbili = (float)_Width / (float)_Height;
                    float wishbili = (float)_sWidth / (float)_sHeight;

                    //实际图比缩略图最大尺寸更宽矮，以宽为准
                    if (realbili > wishbili)
                    {
                        _sHeight = (int)((float)_sWidth / realbili);
                    }
                    //实际图比缩略图最大尺寸更高长，以高为准
                    else
                    {
                        _sWidth = (int)((float)_sHeight * realbili);
                    }
                    #endregion

                    this.OutThumbFileName = FName.Split('.').GetValue(0).ToString() + "_s." + FName.Split('.').GetValue(1).ToString();
                    string ImgFilePath = _SavePath + this.OutThumbFileName;

                    System.Drawing.Image newImg = Img.GetThumbnailImage(_sWidth, _sHeight, null, System.IntPtr.Zero);
                    newImg.Save(ImgFilePath);
                    newImg.Dispose();
                    _Iss = true;
                }

                newFile.Close();
                newFile.Dispose();
                _OutFileName = FName;
                _FileSize = _FileSizeTemp;
                _Error = 0;
                return;
            }
            catch
            {
                _Error = 4;
                return;
            }
        }

        public void Upload64()
        {
            int delLength = _DataUrl.IndexOf(',') + 1;
            string str = _DataUrl.Substring(delLength, _DataUrl.Length - delLength);
            str=str.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
            if (str.Length % 4 > 0)
            {
                str = str.PadRight(str.Length + 4 - str.Length % 4, '=');
            }
            byte[] bData = Convert.FromBase64String(str);

            int iLen = bData.Length;
            if (iLen > _MaxSize)
            {
                _Error = 3;
                return;
            }
            try
            {
                if (!Directory.Exists(_SavePath)) Directory.CreateDirectory(_SavePath);

                string FName;
                FName = FileName(".jpg");
                string TempFile = FName;

                FileStream newFile = new FileStream(_SavePath + TempFile, FileMode.Create);
                newFile.Write(bData, 0, bData.Length);
                newFile.Flush();
                int _FileSizeTemp = iLen;

                string ImageFilePath = _SavePath + FName;

                //获取图片的高度和宽度
                System.Drawing.Image Img = System.Drawing.Image.FromStream(newFile);
                _Width = Img.Width;
                _Height = Img.Height;

                //生成缩略图部分 
                if (_IsCreateImg)
                {
                    #region 缩略图大小只设置了最大范围，并不是实际大小
                    float realbili = (float)_Width / (float)_Height;
                    float wishbili = (float)_sWidth / (float)_sHeight;

                    //实际图比缩略图最大尺寸更宽矮，以宽为准
                    if (realbili > wishbili)
                    {
                        _sHeight = (int)((float)_sWidth / realbili);
                    }
                    //实际图比缩略图最大尺寸更高长，以高为准
                    else
                    {
                        _sWidth = (int)((float)_sHeight * realbili);
                    }
                    #endregion

                    this.OutThumbFileName = FName.Split('.').GetValue(0).ToString() + "_s." + FName.Split('.').GetValue(1).ToString();
                    string ImgFilePath = _SavePath + this.OutThumbFileName;

                    System.Drawing.Image newImg = Img.GetThumbnailImage(_sWidth, _sHeight, null, System.IntPtr.Zero);
                    newImg.Save(ImgFilePath);
                    newImg.Dispose();
                    _Iss = true;
                }

                newFile.Close();
                newFile.Dispose();
                _OutFileName = FName;
                _FileSize = _FileSizeTemp;
                _Error = 0;
                return;
            }
            catch
            {
                _Error = 4;
                return;
            }
        }

        #endregion
    }
}