using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace SysBaseLibs
{
    public class UploadFileHelper
    {
        public static UploadFileHelper Instance { get; } = new UploadFileHelper();

        public UploadResult UploadFiles(string filePath, string fileType, HttpRequestBase request, HttpServerUtilityBase server)
        {
            UploadResult result = new UploadResult
            {
                FileUrls = new ArrayList(),
                Success = false,
                Msg = "Failure!",
                VirtualPathUrls = new ArrayList(),
            };

            //遍历所有文件域
            foreach (string fieldName in request.Files.AllKeys)
            {
                HttpPostedFileBase file = request.Files.Get(fieldName);
                string ymd = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
                filePath += ymd + "/";
                string fileName = DateTime.Now.ToString("yyyyMMddhhmmss_ffff");
                string urlPath = $"{filePath}{fileName}.{fileType}";
                string virtualPath = server.MapPath(urlPath);
                try
                {
                    if (!Directory.Exists(server.MapPath(filePath)))
                        Directory.CreateDirectory(server.MapPath(filePath));
                    file?.SaveAs(virtualPath);
                    result.FileUrls.Add(urlPath);
                    result.VirtualPathUrls.Add(virtualPath);
                    result.Success = true;
                    result.Msg = "Success!";
                }
                catch (Exception e)
                {
                    result.Msg = e.Message;
                    return result;
                }
            }
            return result;
        }

        public UploadResult UploadFiles2(string filePath, HttpPostedFileBase requestFile, HttpServerUtilityBase server)
        {
            UploadResult result = new UploadResult
            {
                FileUrls = new ArrayList(),
                Success = false,
                Msg = "Failure!"
            };

            //遍历所有文件域
            string urlPath = $"{filePath}";
            string virtualPath = server.MapPath(urlPath);
            try
            {
                if (File.Exists(virtualPath))
                    File.Delete(virtualPath);
                requestFile?.SaveAs(virtualPath);
                result.FileUrls.Add(urlPath);
                result.VirtualPathUrls.Add(virtualPath);
                result.Success = true;
                result.Msg = "Success!";
            }
            catch (Exception e)
            {
                result.Msg = e.Message;
                return result;
            }
            return result;
        }
    }
    public class UploadResult
    {
        /// <summary>
        /// 表示文件是否已上传成功。
        /// </summary>
        // ReSharper disable once InconsistentNaming
        public bool Success;
        /// <summary>
        /// 自定义的附加消息。
        /// </summary>
        // ReSharper disable once InconsistentNaming
        public string Msg;

        /// <summary>
        /// 表示所有文件的保存地址，该变量为一个数组。
        /// </summary>
        // ReSharper disable once InconsistentNaming
        public ArrayList FileUrls;

        public ArrayList VirtualPathUrls;
    }
}