using System;
using System.IO;
using System.Web;
using Newtonsoft.Json.Linq;
using HZQR.Common;

namespace FileTransmission
{
    /// <summary>
    /// FileUpload 的摘要说明
    /// </summary>
    public class FileUpload : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.HeaderEncoding = System.Text.Encoding.UTF8;
            context.Response.ContentType = "text/plain";
            context.Response.Charset = "utf-8";

            JObject keyValuePairs = new JObject();

            try
            {
                //文件名称
                string fileName = context.Server.UrlDecode(context.Request.Headers["FileName"].ToString());
                //存储路径
                string fileDir = context.Server.UrlDecode(context.Request.Headers["FileDir"].ToString());
                //目标文件名称
                string DestFileName = context.Request.Headers["DestFileName"] == null ? "" :
                    context.Server.UrlDecode(context.Request.Headers["DestFileName"].ToString());
                //目标路径
                string DestDir = context.Request.Headers["DestDir"] == null ? "" : 
                    context.Server.UrlDecode(context.Request.Headers["DestDir"].ToString());
                //判断路径地址是不是绝对路径，不是则根据相对路径进行转化
                if (!Path.IsPathRooted(fileDir))
                {
                    fileDir = HttpContext.Current.Server.MapPath(fileDir);
                }
                //判断是否是删除文件
                if (context.Request.Headers["FileDelete"].TryParseToInt() == 1)
                {
                    //判断路径地址是不是绝对路径，不是则根据相对路径进行转化
                    if (!Path.IsPathRooted(fileDir))
                    {
                        fileDir = HttpContext.Current.Server.MapPath(fileDir);
                    }
                    //创建文件夹
                    if (Directory.Exists(fileDir))
                    {
                        if (File.Exists(fileDir + "\\" + fileName))
                        {
                            //删除文件
                            File.Delete(fileDir + "\\" + fileName);
                            LogUtil.WriteLog(null, "已删除文件：" + fileDir + "\\" + fileName,
                                DateTime.Now.ToString("yyyyMMdd") + "_DeleteFile");
                        }
                        if (Directory.GetFiles(fileDir).Length == 0)
                        {
                            //删除文件夹
                            Directory.Delete(fileDir);
                            LogUtil.WriteLog(null, "已删除文件夹：" + fileDir,
                                DateTime.Now.ToString("yyyyMMdd") + "_DeleteFile");
                        }
                    }

                    keyValuePairs["Result_Code"] = 100;
                    keyValuePairs["Result_Desc"] = "删除完成";
                }
                else if (context.Request.Headers["DirMove"].TryParseToInt() == 1)
                {
                    string destFileAbsUrl = DestDir + "\\" + (string.IsNullOrWhiteSpace(DestFileName) ? fileName : DestFileName);

                    //文件是否存在
                    if (Directory.Exists(DestDir + "\\" + DestFileName) || File.Exists(DestDir + "\\" + DestFileName))
                    {
                        //覆盖文件
                        if (context.Request.Headers["coverDir"].TryParseToInt() == 1)
                        {
                            //目标路径文件夹不存在，则先新建文件夹
                            if (!Directory.Exists(DestDir))
                            {
                                Directory.CreateDirectory(DestDir);
                            }

                            if (!string.IsNullOrWhiteSpace(fileName))//移动文件
                            {
                                //目标路径已存在文件，则先删除文件，然后再迁移
                                if (File.Exists(destFileAbsUrl))
                                {
                                    File.Delete(destFileAbsUrl);
                                }

                                File.Move(fileDir + "\\" + fileName, destFileAbsUrl);

                                LogUtil.WriteLog(null, "移动文件：" + fileDir + "\\" + fileName + "至" + destFileAbsUrl,
                                    DateTime.Now.ToString("yyyyMMdd") + "_MoveDirectory");

                                keyValuePairs["Result_Code"] = 100;
                                keyValuePairs["Result_Desc"] = "移动成功！";
                            }

                            foreach (FileInfo fileInfo in new DirectoryInfo(fileDir).GetFiles())
                            {
                                //目标路径已存在文件，则先删除文件，然后再迁移
                                if (File.Exists(DestDir + "\\" + fileInfo.Name))
                                {
                                    File.Delete(DestDir + "\\" + fileInfo.Name);
                                }

                                File.Move(fileInfo.FullName, DestDir + "\\" + fileInfo.Name);

                                LogUtil.WriteLog(null, "移动文件：" + fileDir + "\\" + fileName + "至" + destFileAbsUrl,
                                    DateTime.Now.ToString("yyyyMMdd") + "_MoveDirectory");
                            }

                            keyValuePairs["Result_Code"] = 100;
                            keyValuePairs["Result_Desc"] = "移动成功！";
                        }
                        else
                        {
                            if (!string.IsNullOrWhiteSpace(fileName))
                            {
                                if (File.Exists(destFileAbsUrl))
                                {
                                    keyValuePairs["Result_Code"] = 200;
                                    keyValuePairs["Result_Desc"] = DestDir + "文件已存在是否覆盖";
                                }
                                else
                                {
                                    File.Move(fileDir + "\\" + fileName, destFileAbsUrl);

                                    keyValuePairs["Result_Code"] = 100;
                                    keyValuePairs["Result_Desc"] = "移动成功！";
                                }
                            }
                            //文件已经存在返回提示
                            keyValuePairs["Result_Code"] = 200;
                            keyValuePairs["Result_Desc"] = DestDir + "文件已存在是否覆盖";
                        }
                    }
                    else
                    {
                        //如果移动的是文件，则直接迁移过去
                        if (!string.IsNullOrEmpty(fileName))
                        {
                            //目标路径文件夹不存在，则先新建文件夹
                            if (!Directory.Exists(DestDir))
                            {
                                Directory.CreateDirectory(DestDir);
                            }
                            File.Move(fileDir + "\\" + fileName, destFileAbsUrl);
                        }
                        else
                        {
                            //把新文件移动到目标目录下
                            Directory.Move(fileDir, DestDir);
                        }

                        keyValuePairs["Result_Code"] = 100;
                        keyValuePairs["Result_Desc"] = "移动成功！";
                    }

                }
                else
                {
                    //文件大小
                    int fileSize = int.Parse(context.Request.Headers["FileSize"].ToString());
                    //申明二进制文件流
                    byte[] bytes = context.Request.BinaryRead(fileSize);
                    //创建文件夹
                    if (!Directory.Exists(fileDir))
                    {
                        Directory.CreateDirectory(fileDir);
                    }
                    //生成文件
                    File.WriteAllBytes($"{fileDir}\\{fileName}", bytes);

                    keyValuePairs["Result_Code"] = 100;
                    keyValuePairs["Result_Desc"] = "上传成功";
                }
            }
            catch (Exception ex)
            {
                keyValuePairs["Result_Code"] = 999;
                keyValuePairs["Result_Desc"] = "传输失败！" + ex.Message;

                LogUtil.WriteLog(ex, "", DateTime.Now.ToString("yyyyMMdd") + "_ErrorLog");
            }
            finally
            {
                context.Response.Write(keyValuePairs.ToString());
                context.Response.End();
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}