using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http;
using XdCxRhDW.Dto;
using XdCxRhDW.WebApi;

namespace XdCxRhDW.App.Controllers
{
    /// <summary>
    ///文件上传接口
    /// </summary>
    public class FileController : BaseController
    {
        private readonly string uploadFolder;

        /// <summary>
        /// 
        /// </summary>
        public FileController()
        {
            this.uploadFolder = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot");
        }

        /// <summary>
        /// 上传文件(返回上传后的文件名)
        /// </summary>
        /// <returns></returns>
        [HttpPost, SwaggerForm]
        public async Task<AjaxResult<string>> UploadFileAsync()
        {
            if (!Request.Content.IsMimeMultipartContent("form-data"))
            {
                bool s = Request.Content.IsFormData();
                return Error<string>("请求数据不是form-data类型");
            }
            var provider = new MultipartMemoryStreamProvider();
            await Request.Content.ReadAsMultipartAsync(provider);
            Directory.CreateDirectory(uploadFolder);
            var content = provider.Contents.First();
            var fileName = Guid.NewGuid().ToString() + ".dat";
            var fileData = await content.ReadAsByteArrayAsync();
            // 将文件保存到本地文件夹中
            var filePath = Path.Combine(uploadFolder, fileName);
            using (var fileStream = new FileStream(filePath, FileMode.Create))
            {
                await fileStream.WriteAsync(fileData, 0, fileData.Length);
            }

            //清除1个小时之前的文件
            _ = Task.Run(() =>
            {

                var files = Directory.EnumerateFiles(uploadFolder);
                foreach (var file in files)
                {
                    FileInfo info = new FileInfo(file);
                    if (info.CreationTime < DateTime.Now.AddHours(-1))
                    {
                        try
                        {
                            info.Delete();
                        }
                        catch
                        {
                        }
                    }
                }
            });
            return Success(fileName);
        }

        /// <summary>
        /// 批量删除文件
        /// </summary>
        /// <param name="files">上传后返回的一个或多个文件集合</param>
        /// <returns>返回删除成功的文件个数</returns>
        [HttpPost]
        public AjaxResult<int> DeleteFiles(List<string> files)
        {
            int count = 0;
            foreach (var fileName in files)
            {
                try
                {
                    var file = Path.Combine(uploadFolder, fileName);
                    File.Delete(file);
                    count++;
                }
                catch (Exception ex)
                {
                    Serilog.Log.Error(ex, $"删除文件[{fileName}]失败!");
                }
            }
            return Success(count);

        }

    }
}