using System;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using LANCommander.Launcher.Plugins;
using LANCommander.Launcher.ViewModels;
using Microsoft.Extensions.DependencyInjection;

namespace LANCommander.Launcher.Views;

public partial class MainWindow : Window
{
    private WindowState _stateBeforeBigScreen = WindowState.Normal;
    private bool _allowClose;

    /// <summary>Raised after the window hides to the tray (close intercepted).</summary>
    public event EventHandler? HiddenToTray;

    public MainWindow()
    {
        InitializeComponent();

        // Content templates come from the shared view registry (seeded with the built-in mappings and
        // extendable by plugins) rather than inline XAML DataTemplates.
        var registry = App.Services?.GetService<IViewRegistry>();
        if (registry != null)
            MainContent.DataTemplates.Add(registry.AsDataTemplate());

        Closing += (_, e) =>
        {
            // Hide to the system tray instead of closing; the app keeps running.
            if (_allowClose)
                return;
            
            e.Cancel = true;
            
            Hide();
            
            HiddenToTray?.Invoke(this, EventArgs.Empty);
        };

        DataContextChanged += (_, _) =>
        {
            if (DataContext is MainWindowViewModel vm)
            {
                vm.BigScreenModeChanged += OnBigScreenModeChanged;
                vm.ExitLauncherRequested += (_, _) => ExitApplication();

                // Apply big screen mode if it was persisted or set via command line
                if (vm.IsBigScreenMode)
                    WindowState = WindowState.FullScreen;
            }
        };
    }

    private void OnBigScreenModeChanged(object? sender, System.EventArgs e)
    {
        if (sender is not MainWindowViewModel vm) return;

        if (vm.IsBigScreenMode)
        {
            _stateBeforeBigScreen = WindowState;
            WindowState = WindowState.FullScreen;
        }
        else
            WindowState = _stateBeforeBigScreen;
    }

    private void ResizeGrip_PointerPressed(object? sender, PointerPressedEventArgs e)
    {
        if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
            return;
        
        if (WindowState != WindowState.Normal)
            return;
        
        if (sender is not Border { Name: var name })
            return;
        
        var edge = name switch
        {
            "ResizeNW" => WindowEdge.NorthWest,
            "ResizeN"  => WindowEdge.North,
            "ResizeNE" => WindowEdge.NorthEast,
            "ResizeW"  => WindowEdge.West,
            "ResizeE"  => WindowEdge.East,
            "ResizeSW" => WindowEdge.SouthWest,
            "ResizeS"  => WindowEdge.South,
            "ResizeSE" => WindowEdge.SouthEast,
            _          => (WindowEdge?)null
        };
        
        if (edge.HasValue)
            BeginResizeDrag(edge.Value, e);
    }

    private void TitleBarDragRegion_PointerPressed(object? sender, PointerPressedEventArgs e)
    {
        if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
            BeginMoveDrag(e);
    }

    private void TitleBarDragRegion_DoubleTapped(object? sender, TappedEventArgs e)
    {
        WindowState = WindowState == WindowState.Maximized
            ? WindowState.Normal
            : WindowState.Maximized;
    }

    private void MinimizeButton_Click(object? sender, RoutedEventArgs e)
    {
        WindowState = WindowState.Minimized;
    }

    private void MaximizeButton_Click(object? sender, RoutedEventArgs e)
    {
        WindowState = WindowState == WindowState.Maximized
            ? WindowState.Normal
            : WindowState.Maximized;
    }

    private void CloseButton_Click(object? sender, RoutedEventArgs e)
    {
        Close();
    }

    /// <summary>
    /// Bring the window back to the foreground after it has been hidden to the
    /// tray or minimized. Used by the tray and when a second launcher instance
    /// asks the running one to surface.
    /// </summary>
    public void RestoreFromTray()
    {
        Show();

        if (WindowState == WindowState.Minimized)
            WindowState = WindowState.Normal;

        Activate();
    }

    /// <summary>
    /// Fully exit the application, bypassing the close-to-tray behavior.
    /// </summary>
    public void ExitApplication()
    {
        _allowClose = true;
        
        Close();
    }
}