using Microsoft.Extensions.Hosting;
using Serilog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DW5S.WebApi
{
    /// <summary>
    /// 基础清理服务(负责upload目录的清理,不会清理NotClear目录及其文件)
    /// </summary>
    public class BaseClearService : BackgroundService
    {
        private readonly string dir = "upload";
        private readonly ILogger logger;
        /// <summary>
        /// 
        /// </summary>
        /// <param name="logger"></param>
        public BaseClearService(ILogger logger)
        {
            this.logger = logger;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="stoppingToken"></param>
        /// <returns></returns>
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            await Task.Delay(5000, stoppingToken);//延迟一会儿让webbapi先启动
            logger.Information($"启动通用目录{dir}数据清理功能...");
            await Task.Run(async () =>
            {
                while (!stoppingToken.IsCancellationRequested)
                {
                    Clear();
                    //5分钟扫描一次
                    await Task.Delay(600 * 1000, stoppingToken);
                }
                //程序退出时强制删除所有

                try
                {
                    Directory.Delete(dir, true);
                }
                catch
                { }
            }, stoppingToken);

        }

        private void Clear()
        {
            #region 清理空目录
            string clearDir = Path.Combine(AppContext.BaseDirectory, dir);
            try
            {
                var dirs = Directory.EnumerateDirectories(clearDir, "*", SearchOption.AllDirectories);
                foreach (var item in dirs)
                {
                    if (item.ToLower().Contains("notclear")) continue;
                    DirectoryInfo dir = new DirectoryInfo(item);
                    if (dir.EnumerateFiles().Any()) continue;
                    //删除5分钟以前创建的空目录
                    if ((DateTime.Now - dir.CreationTime).TotalMinutes > 5)
                    {
                        dir.Delete();
                    }
                }
            }
            catch (Exception ex)
            {
                logger.Error(ex, $"删除{dir}目录中的空目录出错");
            }
            #endregion

            #region 清理30分钟以前上传的文件
            var files = Directory.EnumerateFiles(clearDir, "*", SearchOption.AllDirectories);
            foreach (var item in files)
            {
                if (item.ToLower().Contains("notclear")) continue;
                FileInfo f = new FileInfo(item);
                if ((DateTime.Now - f.LastWriteTime).TotalMinutes > 30)
                {
                    try
                    {
                        f.Delete();
                    }
                    catch (Exception ex)
                    {
                        logger.Error(ex, $"$删除{dir}目录中文件[{f.Name}]失败");
                    }
                }
            }
            #endregion
        }
    }
}