using OrderSupportTicket.Models;
using OrderSupportTicket.Services;
using OrderSupportTicket.ViewModels;
using System;
using System.Windows;
using System.Windows.Controls;

namespace OrderSupportTicket.Views;

/// <summary>
/// 工单页面外壳，只负责组合子视图以及管理页面生命周期。
/// </summary>
public partial class OrderSupportTicketView : UserControl
{
	private bool _active;
	private Window _hostWindow;

	public OrderSupportTicketView() : this(new TicketService(), CreateDefaultOptions()) { }

	public OrderSupportTicketView(TicketService ticketService, TicketClientOptions options = null)
	{
		InitializeComponent();
		ViewModel = new OrderSupportTicketViewModel(ticketService, options ?? CreateDefaultOptions());
		DataContext = ViewModel;
		Loaded += OnLoaded;
		Unloaded += OnUnloaded;
	}

	public static TicketClientOptions CreateDefaultOptions(string fallbackUserName = null)
	{
		var configured = TicketClientOptions.FromApplicationSettings();
		var userName = !string.IsNullOrWhiteSpace(configured.UserName)
			? configured.UserName
			: (!string.IsNullOrWhiteSpace(fallbackUserName) ? fallbackUserName.Trim() : "18990991234");
		var appIds = configured.AppIds != null && configured.AppIds.Count > 0
			? configured.AppIds
			: new List<string> { "wx316b1291351558aa", "wx7999743c3d64c05c" };

		return new TicketClientOptions
		{
			UserName = userName,
			ConversationMode = configured.ConversationMode,
			AppIds = appIds,
			Orders =
			[
				new TicketOrderOption { Amount = 109m, AppId = "wx316b1291351558aa", GoodsName = "梵客隆收腹内裤女新款高腰无痕磨毛暖融收小肚子提臀塑身平角裤", OrderId = "9000000000000000001", OrderedAt = new DateTime(2020, 1, 1) },
				new TicketOrderOption { Amount = 109m, AppId = "wx7999743c3d64c05c", GoodsName = "洁柔抽纸粉Face家用实惠装批发纸巾大包面纸餐巾纸抽整箱可湿水纸", OrderId = "9000000000000000002", OrderedAt = new DateTime(2020, 1, 1) }
			]
		};
	}

	public OrderSupportTicketViewModel ViewModel { get; }
	public void Configure(TicketClientOptions options) => ViewModel.Configure(options);
	public void OpenNewTicket(TicketOrderOption order) => ViewModel.OpenNewTicket(order);
	public void OpenTicket(string appId, string wechatOrderId) => ViewModel.OpenTicket(appId, wechatOrderId);

	private async void OnLoaded(object sender, RoutedEventArgs e)
	{
		if (_active) return;
		_active = true;
		AttachHostWindow(Window.GetWindow(this));
		UpdateWindowActiveState();
		await ViewModel.InitializeAsync();
	}

	private async void OnUnloaded(object sender, RoutedEventArgs e)
	{
		if (!_active) return;
		_active = false;
		ViewModel.IsWindowActive = false;
		DetachHostWindow();
		await ViewModel.DeactivateAsync();
	}

	private void AttachHostWindow(Window window)
	{
		DetachHostWindow();
		_hostWindow = window;
		if (_hostWindow == null) return;
		_hostWindow.Activated += OnHostWindowStateChanged;
		_hostWindow.Deactivated += OnHostWindowStateChanged;
		_hostWindow.IsVisibleChanged += OnHostWindowIsVisibleChanged;
		_hostWindow.StateChanged += OnHostWindowStateChanged;
		_hostWindow.Closed += OnHostWindowClosed;
	}

	private void DetachHostWindow()
	{
		if (_hostWindow == null) return;
		_hostWindow.Activated -= OnHostWindowStateChanged;
		_hostWindow.Deactivated -= OnHostWindowStateChanged;
		_hostWindow.IsVisibleChanged -= OnHostWindowIsVisibleChanged;
		_hostWindow.StateChanged -= OnHostWindowStateChanged;
		_hostWindow.Closed -= OnHostWindowClosed;
		_hostWindow = null;
	}

	private void UpdateWindowActiveState()
	{
		ViewModel.IsWindowActive = _hostWindow != null && _hostWindow.IsVisible && _hostWindow.IsActive && _hostWindow.WindowState != WindowState.Minimized;
	}

	private void OnHostWindowStateChanged(object sender, EventArgs e) => UpdateWindowActiveState();
	private void OnHostWindowIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) => UpdateWindowActiveState();
	private void OnHostWindowClosed(object sender, EventArgs e) { ViewModel.IsWindowActive = false; DetachHostWindow(); }
}