using _29WxOrderWpf.Ctrls.PDDInvoice.ViewModels;
using CefSharp.DevTools.Overlay;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace _29WxOrderWpf.Ctrls.PDDInvoice;

/// <summary>
/// PDDInvoiceView.xaml 的交互逻辑
/// </summary>
public partial class PDDInvoiceView : UserControl
{
	private PDDInvoiceViewModel vm = new PDDInvoiceViewModel();
	public PDDInvoiceView()
	{
		InitializeComponent();
		DataContext = vm;
		vm.BatchInvoiceChanged += Vm_BatchInvoiceChanged;
	}

	private void Vm_BatchInvoiceChanged(object sender, int e)
	{
		ScrollToCurrent(e);
	}

	private void txtSearch_KeyDown(object sender, KeyEventArgs e)
	{
		if (e.Key == Key.Enter && DataContext is PDDInvoiceViewModel viewModel)
		{
			viewModel.SearchCommand.Execute(null);
		}
	}
	private DispatcherTimer _scrollStopTimer;


	private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
	{
		// 每次滚动都重置计时器
		if (_scrollStopTimer == null)
		{
			_scrollStopTimer = new DispatcherTimer
			{
				Interval = TimeSpan.FromMilliseconds(100) // 200ms 内无滚动视为停止
			};
			_scrollStopTimer.Tick += ScrollStopTimer_Tick;
		}

		_scrollStopTimer.Stop();
		_scrollStopTimer.Start();
		(DataContext as PDDInvoiceViewModel).IsLoadImage = false;
	}
	private void ScrollStopTimer_Tick(object sender, EventArgs e)
	{
		_scrollStopTimer.Stop();

		// 用 Background 优先级设置，避免和当前这一帧的滚动惯性/渲染争抢，
		// 让 UI 线程先把滚动动画收尾，再去处理这一波图片加载触发
		Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
		{
			vm.IsLoadImage = true;
		}));
	}


	private void ScrollToCurrent(int index)
	{

		if (itemsControl == null) return;

		// 方案A：逻辑滚动（你的 CanContentScroll=True，推荐）
		var sv = itemsControl.Template.FindName("PART_ScrollViewer", itemsControl) as ScrollViewer;
		if (sv != null)
		{

			if (index >= 0)
			{
				sv.ScrollToVerticalOffset(index - 1);
				return;
			}
		}

		// 方案B：兜底，用容器 BringIntoView
		itemsControl.UpdateLayout();
		var container = itemsControl.ItemContainerGenerator
								   .ContainerFromItem(vm.SelectedOrder) as FrameworkElement;
		container?.BringIntoView();
	}
	
}