using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Text;

namespace Mtxfw.Utility
{
    /// <summary>
    /// 文件上传 By Telesa 2011.02.29
    /// </summary>
    public class UploadFile
    {
        #region 私有成员
        private HttpPostedFile _HttpPostedFile;
        private string _InPath;
        private string _UpType;
        private bool _IsBool;
        private string _UploadPath;
        private string _Message;
        private int _UpSize;
        private string _FileName;
        private long _FileSize;
        private string _FileType;

        #endregion

        #region 构造函数
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="isControl">上传控件</param>
        /// <param name="isPath">上传路径</param>
        /// <param name="upType">上传类型逗号分隔:jpg,gif,bmp</param>
        public UploadFile(HttpPostedFile PostFile, string isPath, string upType, int upSize)
        {
            this._HttpPostedFile = PostFile;
            this._InPath = isPath;
            this._UpType = upType;
            this._UpSize = upSize;
        }
        #endregion

        #region 私有方法

        /// <summary>
        /// 生成GUID字符串
        /// </summary>
        private string getGuidString()
        {
            return Guid.NewGuid().ToString().Replace("-", "").ToUpper();
        }

        /// <summary>
        /// 获取上传文件的扩展名 不带 "."
        /// </summary>
        private string getExtension(string file)
        {
            string name = Path.GetExtension(_HttpPostedFile.FileName);
            return name.Substring(name.LastIndexOf(".") + 1).ToLower();
        }

        /// <summary>
        /// 获取上传文件的原始名称
        /// </summary>
        private string getName(string file)
        {
            return file.Substring(file.LastIndexOf("/") + 1).ToLower();
        }

        /// <summary>
        /// 判断上传的文件类型是否是允许的
        /// </summary>
        private bool hasType(string[] array, string type)
        {
            bool isType = false;
            foreach (string str in array)
            {
                if (type.IndexOf(str) != -1)
                {
                    isType = true;
                    //如果上传的文件类型是允许的则跳出循环
                    break;
                }
            }
            return isType;
        }


        //按年月日生产文件夹 格式 \YYYY\MM\DD
        private string getDateString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append(DateTime.Now.Year);
            sb.Append("-");
            sb.Append(DateTime.Now.Month);
            sb.Append("-");
            sb.Append(DateTime.Now.Day);
            sb.Append("/");
            return sb.ToString();
        }

        #endregion

        #region 公有方法
        /// <summary>
        /// 上传文件 并判断是否上传成功
        /// </summary>
        /// <returns></returns>
        public bool StatrUpFile()
        {
            string isFileName = getExtension(_HttpPostedFile.FileName); //获取文件扩展名
            _FileType = getExtension(_HttpPostedFile.FileName);
            _FileSize = _HttpPostedFile.ContentLength;
            string strContentType = _HttpPostedFile.ContentType.ToLower();
            //获取文件的原始文件名
            _FileName = getName(_HttpPostedFile.FileName);

            string[] typeList = _UpType.Split(',');          //限制上传的类型集合
            _IsBool = hasType(typeList, isFileName);

            if (!String.IsNullOrEmpty(_HttpPostedFile.FileName))
            {
                if (_HttpPostedFile.ContentLength < (_UpSize * 1024))
                {
                    if (_IsBool)
                    {
                        if (strContentType.IndexOf("jpg") != -1 || strContentType.IndexOf("jpeg") != -1 || strContentType.IndexOf("gif") != -1 || strContentType.IndexOf("png") != -1 || strContentType.IndexOf("bmp") != -1)
                        {
                            string FileType = _HttpPostedFile.FileName.Substring(_HttpPostedFile.FileName.LastIndexOf(".")).ToLower();

                            try
                            {
                                string DateString = getDateString();
                                string GuidName = getGuidString();
                                string InPathName = _InPath + DateString;

                                //如果文件夹不存在则创建
                                if (!Directory.Exists(System.Web.HttpContext.Current.Server.MapPath(InPathName)))
                                {
                                    Directory.CreateDirectory(System.Web.HttpContext.Current.Server.MapPath(InPathName));
                                }

                                //创建GUID图片名
                                string Final_Name = string.Format("{0}.{1}", GuidName, isFileName);
                                //上传
                                _HttpPostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath(InPathName + Final_Name));
                                if (!Mtxfw.Utility.Common.IsAllowedExtension(System.Web.HttpContext.Current.Server.MapPath(InPathName + Final_Name)))
                                {
                                    File.Delete(System.Web.HttpContext.Current.Server.MapPath(InPathName + Final_Name));
                                    _Message = "";
                                    return false;
                                }
                                else
                                {
                                    _UploadPath = DateString + Final_Name;
                                    return true;
                                }
                            }
                            catch (Exception e)
                            {
                                _Message = e.Message;
                                return false;
                            }

                        }
                        else
                        {
                            _Message = "文件上传格式错误哦,请上传: " + _UpType + " 格式文件";
                            return false;
                        }
                    }
                    else
                    {
                        _Message = "文件上传格式错误哦,请上传: " + _UpType + " 格式文件";
                        return false;
                    }
                }
                else
                {
                    _Message = "上传的文件不能大于 " + _UpSize + " KB";
                    return false;
                }
            }
            else
            {
                _Message = "请选择要上传的文件!";
                return false;
            }
        }
        #endregion

        #region 公共属性

        /// <summary>
        /// 获取文件上传后的路径
        /// </summary>
        public string UploadPath
        {
            get { return _UploadPath; }
        }

        /// <summary>
        /// 异常信息
        /// </summary>
        public string Message
        {
            get { return _Message; }
        }

        /// <summary>
        /// 获取上传文件的原始文件名
        /// </summary>
        public string FileName
        {
            get { return _FileName; }
        }

        /// <summary>
        /// 获取上传文件的类型
        /// </summary>
        public string FileType
        {
            get { return _FileType; }
        }

        /// <summary>
        /// 获取上传文件字节流的长度
        /// </summary>
        public long FileSize
        {
            get { return _FileSize; }
        }
        #endregion
    }
}