using CnasSynchrousModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace CNAS_SyncService
{
    public class FileWatcherOperation
    {
        /// <summary>
        /// 所有的同步项
        /// </summary>
        private List<SyncInstrumentItemInfo> LstSyncInstrument { get; set; }

        /// <summary>
        /// 需要监控的同步项集合
        /// </summary>
        public List<FileWatcherItem> LstWatcherItems { get; set; }

        /// <summary>
        /// 需要监控的数据源类型
        /// </summary>
        private List<DataSourceType> lstWatchedataSourceType = new List<DataSourceType> {
            DataSourceType.Access,
            DataSourceType.Excel,
            DataSourceType.FoxPro,
            DataSourceType.SQLLite,
            DataSourceType.TXT
        };

        /// <summary>
        /// 构造函数
        /// </summary>
        public FileWatcherOperation(List<SyncInstrumentItemInfo> LstSyncInstrument)
        {
            this.LstSyncInstrument = LstSyncInstrument;
        }

        /// <summary>
        /// 获取需要监控的同步项
        /// </summary>
        public void GetFileWatcherItems()
        {
            LstWatcherItems=new List<FileWatcherItem>();
         
            foreach (var item in LstSyncInstrument)
            {
                if (lstWatchedataSourceType.Contains(item.SyncInstrumentDSInfo.InstrumentDataSourceType)&&item.SyncInstrumentDSInfo.DsPathType == PathType.Local)
                {
                    FileWatcherItem watcherItem = new FileWatcherItem() {
                        SyncItemId = item.GUID,
                        SyncPath = item.SyncInstrumentDSInfo.Path,
                        SyncIfLocal = item.SyncInstrumentDSInfo.DsPathType == PathType.Local ? true : false,
                        SyncIfChanged=false
                    };

                    if (!LstWatcherItems.Contains(watcherItem))
                        LstWatcherItems.Add(watcherItem);
                }
            }
        }

        /// <summary>
        /// 启动文件/文件夹监控
        /// </summary>
        public void StartFileWatcher()
        {
            foreach (var item in LstWatcherItems)
            {
                FileSystemWatcher watcher = new FileSystemWatcher();

                var file = new FileInfo(item.SyncPath);
                watcher.Path = file.DirectoryName;   //监视文件的文件夹所在目录
                watcher.Filter = file.Name;  //表示监视的是文件夹里面的哪个文件

                //设置监视文件的哪些修改行为
                watcher.NotifyFilter = NotifyFilters.LastAccess
                    | NotifyFilters.LastWrite|NotifyFilters.FileName;

                watcher.Changed += new FileSystemEventHandler(OnChanged);
                watcher.Created += new FileSystemEventHandler(OnChanged);

                watcher.EnableRaisingEvents = true;
            }
        }

        /// <summary>
        /// 任何一个同步项的文件/文件夹发生变化/新增时触发该方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnChanged(object sender, FileSystemEventArgs e)
        {
            foreach (var item in LstWatcherItems)
            {
                if (e.FullPath == item.SyncPath)
                {
                    item.SyncIfChanged = true;
                }
            }
        }
    }
}