using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using KPlan.Util;

namespace KPlan.Forms {
   class KBackgroundWorker {
      public BackgroundWorker backgroundWorker { get; set; }
      private Window parent;
      private KBgWorker2 pbDialog;

      public KBackgroundWorker(Window parent) {
         this.parent = parent;
         //可以返回工作进度
         backgroundWorker = new BackgroundWorker();
         backgroundWorker.WorkerReportsProgress = true;
         //允许取消
         backgroundWorker.WorkerSupportsCancellation = true;
         backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;
         //更新进度条
         backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;
         //backgroundWorker.DoWork += Query_Async;
         //backgroundWorker.DoWork += backgroundWorker_DoWork;
         //开始执行DoWork
         //backgroundWorker.RunWorkerAsync();
      }

      public void Start(object param,bool disableCancel) {
         if (backgroundWorker.IsBusy) {
            return;
         }
         if (parent != null) {
            parent.IsEnabled = false;
         }
         pbDialog = new KBgWorker2(parent, backgroundWorker);
         if (disableCancel) {
            pbDialog.tb_cancel.Width = 0;
            pbDialog.tb_cancel.Visibility = Visibility.Hidden;
         }
         backgroundWorker.RunWorkerAsync(param);
      }

      public void Start(object param) {
         if (backgroundWorker.IsBusy) {
            return;
         }
         if (parent != null) {
            parent.IsEnabled = false;
         }
         pbDialog = new KBgWorker2(parent, backgroundWorker);
         backgroundWorker.RunWorkerAsync(param);
      }

      public bool IsCancel() {
         return backgroundWorker.CancellationPending;
      }


      private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
         pbDialog.Dispatcher.Invoke(new Action(delegate {
            pbDialog.Close();
         }));
         if (parent != null) {
            parent.IsEnabled = true;
         }
         if (e.Error != null) {
            KUtil.LogErr(e.Error);
            MessageBox.Show(parent, "发生异常：" + e.Error.Message);
         }
         else {
            if (e.Cancelled) {
               MessageBox.Show(parent, "已取消");
            }
            //else {
            //   MessageBox.Show(parent, "操作完成");
            //}
         }
      }

      private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) {
         pbDialog.progressBar.Value = e.ProgressPercentage;
      }

      public void Progress(string text, int progress) {
         pbDialog.Dispatcher.Invoke(new Action(delegate {
            pbDialog.lable.Content = text;
         }));
         backgroundWorker.ReportProgress(progress);
      }

   }
}