using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using ShrlAlgoToolkit.Core.Assists;
using ShrlAlgoToolkit.RevitAddins.Assists;
using ShrlAlgoToolkit;
using ShrlAlgoToolkit.RevitAddins;
using ShrlAlgoToolkit.RevitAddins.Assists;
using ShrlAlgoToolkit;
using ShrlAlgoToolkit.RevitAddins;

namespace ShrlAlgoToolkit.RevitAddins.Windows
{
    class ProcessEventHandler<T> : IExternalEventHandler
    {
        public ProgressMonitorView ProgressBarView { get; set; }
        public ProgressMonitorViewModel ViewModel { get; set; }
        public IEnumerable<T> Collection { get; set; }
        /// <summary>
        /// 附加的参数，用于传额外的变量
        /// </summary>
        public object AddinParameter { get; set; }

        bool Cancel = false;
        private readonly ExternalEvent externalEvent;
        private readonly Action<UIApplication, T, object> action;
        private readonly string transactionName;
        private readonly bool useTransaction;

        private delegate void ProgressBarDelegate();
        public ProcessEventHandler(Action<UIApplication, T, object> action, string transactionName = "处理任务", bool useTransaction = true)
        {
            externalEvent = ExternalEvent.Create(this);
            this.action = action;
            this.transactionName = transactionName;
            this.useTransaction = useTransaction;
        }
        public void Execute(UIApplication app)
        {
            if (app == null)
            {
                CloseWindow();
                return;
            }

            if (app.ActiveUIDocument == null)
                return;

            if (app.ActiveUIDocument.Document == null)
                return;

            if (ProgressBarView == null)
                return;

            if (ViewModel == null)
                return;
            Transaction ts = null;
            // 根据条件决定是否创建并启动事务
            if (useTransaction)
            {
                ts = new(app.ActiveUIDocument.Document, transactionName);
                ts.Start();
            }
            ProgressBarView.btnCancel.Click += CurrentUI_Closed;
            for (ViewModel.CurrentValue = 0; ViewModel.CurrentValue < ViewModel.MaxValue; ViewModel.CurrentValue++)
            {
                System.Threading.Thread.Sleep(20);
                if (Cancel)
                    break;
                var elem = Collection.ElementAt(ViewModel.CurrentValue);
                try
                {
                    action(app, elem, AddinParameter);
                }
                catch(Exception ex)
                {
                    CloseWindow();
                    // 如果发生异常且事务已启动，则回滚事务
                    if (useTransaction && ts != null)
                    {
                        ts.RollBack();
                    }
                    Assists.LogAssist.ToLog(ex.Message);
                    return;
                }
                //await Task.Delay(50);
                //ViewModel.CurrentContext = $"处理 {ViewModel.CurrentValue} / {ViewModel.MaxValue} 完成";
                ProgressBarView.Dispatcher.Invoke<string>(() => ViewModel.CurrentContext = $"处理 {ViewModel.CurrentValue} / {ViewModel.MaxValue} 完成", System.Windows.Threading.DispatcherPriority.Background);
                //ProgressBarView.Dispatcher.Invoke(ViewModel.NotifyUI, System.Windows.Threading.DispatcherPriority.Background);
            }

            // 根据条件决定是否提交事务
            if (useTransaction && ts != null)
            {
                //取消的时候，回滚，而不是提交部分处理的事务
                if (Cancel)
                {
                    ts.RollBack();
                }
                else
                {
                    ts.Commit();
                }
            }
            CloseWindow();
            // 确保事务对象被正确处理
            ts?.Dispose();
        }

        //private async Task Wait()
        //{
        //    await Task.Delay(50);
        //}

        private void CloseWindow()
        {
            ProgressBarView.Closed -= CurrentUI_Closed;
            ProgressBarView.Close();
            //关闭窗口后，需要重设，否则同一个外部事件的Cancel会被上次取消过的情况影响
            Cancel = false;
        }

        private void CurrentUI_Closed(object sender, EventArgs e)
        {
            Cancel = true;
        }

        public string GetName()
        {
            return "进度监视";
        }
        public void Raise()
        {
            externalEvent.Raise();
        }
    }
}