using Editor;
using Sandbox;

namespace SpriteTools.TilesetEditor.Preview;

public class Preview : Widget
{
	public MainWindow MainWindow { get; }
	private readonly RenderingWidget Rendering;

	internal Vector2 TextureSize => Rendering.TextureSize;

	Widget Overlay;
	WidgetWindow overlayWindowZoom;

	public Preview ( MainWindow mainWindow ) : base( null )
	{
		MainWindow = mainWindow;

		Name = "Preview";
		WindowTitle = "Preview";
		SetWindowIcon( "emoji_emotions" );

		MinimumSize = new Vector2( 256, 256 );

		Layout = Layout.Column();

		Rendering = new RenderingWidget( MainWindow, this );
		Layout.Add( Rendering );

		Overlay = new Widget( this )
		{
			Layout = Layout.Row(),
			TranslucentBackground = true,
			NoSystemBackground = true,
			WindowFlags = WindowFlags.FramelessWindowHint | WindowFlags.Tool
		};
		overlayWindowZoom = new WidgetWindow( this );
		overlayWindowZoom.Parent = Overlay;
		overlayWindowZoom.Layout = Layout.Row();
		overlayWindowZoom.Layout.Spacing = 4;
		overlayWindowZoom.Layout.Margin = 4;
		var btnZoomOut = overlayWindowZoom.Layout.Add( new IconButton( "zoom_out" ) );
		btnZoomOut.OnClick = () =>
		{
			Rendering.Zoom( -250 );
		};
		btnZoomOut.ToolTip = "Zoom Out";
		btnZoomOut.StatusTip = "Zoom Out View";
		var btnZoomIn = overlayWindowZoom.Layout.Add( new IconButton( "zoom_in" ) );
		btnZoomIn.OnClick = () =>
		{
			Rendering.Zoom( 250 );
		};
		btnZoomIn.ToolTip = "Zoom In";
		btnZoomIn.StatusTip = "Zoom In View";
		overlayWindowZoom.Layout.AddSeparator();
		var btnFit = overlayWindowZoom.Layout.Add( new IconButton( "zoom_out_map" ) );
		btnFit.OnClick = () =>
		{
			Rendering.Fit();
		};
		btnFit.ToolTip = "Fit to Screen";
		btnFit.StatusTip = "Fit View to Screen";
		overlayWindowZoom.WindowTitle = "Zoom Controls";

		Overlay.Layout.Add( overlayWindowZoom );

		Overlay.Show();
		SetSizeMode( SizeMode.Default, SizeMode.CanShrink );

		MainWindow.Moved += DoLayout;
	}

	public override void OnDestroyed ()
	{
		base.OnDestroyed();

		MainWindow.Moved -= DoLayout;
	}

	internal void UpdateTexture ( string filePath )
	{
		var texture = Texture.LoadFromFileSystem( filePath, Sandbox.FileSystem.Mounted );
		if ( texture is null ) return;
		Rendering.SetTexture( texture );
	}

	protected override void DoLayout ()
	{
		base.DoLayout();

		if ( Overlay.IsValid() && Rendering.IsValid() )
		{
			Overlay.Position = Rendering.ScreenPosition;
			Overlay.Size = Rendering.Size + 1;

			overlayWindowZoom.AdjustSize();
			overlayWindowZoom.AlignToParent( TextFlag.RightTop, 4 );
		}
	}

	protected override void OnVisibilityChanged ( bool visible )
	{
		base.OnVisibilityChanged( visible );

		if ( Overlay is not null )
		{
			Overlay.Visible = visible;
		}
	}
}