using Editor;
using Sandbox;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace SpriteTools;

[DropObject( "spr", "spr" )]
partial class SpriteDropObject : BaseDropObject
{
	SpriteResource sprite;
	Texture texture;
	Vector2 origin;

	protected override async Task Initialize ( string dragData, CancellationToken token )
	{
		Asset asset = await InstallAsset( dragData, token );

		if ( asset is null )
			return;

		if ( token.IsCancellationRequested )
			return;

		sprite = asset.LoadResource<SpriteResource>();
		if ( sprite is null ) return;
		var anim = sprite.Animations.FirstOrDefault();
		if ( anim is null ) return;

		origin = anim.Origin - 0.5f;
		texture = sprite.GetPreviewTexture();
		PackageStatus = null;
	}

	public override void OnUpdate ()
	{
		using var scope = Gizmo.Scope( "DropObject", traceTransform.WithRotation( Rotation.Identity ) );

		Gizmo.Draw.Color = Color.White;
		if ( texture is not null )
		{
			// origin vector in respect to the camera
			var camRot = SceneViewWidget.Current.LastSelectedViewportWidget.State.CameraRotation * Rotation.From( 90, 0, 0 );
			var originVec = camRot.Backward * origin.y + camRot.Right * origin.x;
			Gizmo.Draw.Sprite( originVec * 100f, new Vector2( 100f, 100f ), texture, true );
		}
		else
		{
			Gizmo.Draw.Color = Color.White.WithAlpha( 0.3f );
			Gizmo.Draw.Sprite( Bounds.Center, 16, "materials/gizmo/downloads.png" );
		}
	}

	public override async Task OnDrop ()
	{
		await WaitForLoad();

		if ( sprite is null )
			return;
		var undoScope = SceneEditorSession.Active.UndoScope( "Drag Sprite" ).WithGameObjectCreations();
		using ( undoScope.Push() )
		{
			var DragObject = new GameObject();
			DragObject.Name = sprite.ResourceName;
			DragObject.Transform.World = traceTransform.WithRotation( SceneViewWidget.Current.LastSelectedViewportWidget.State.CameraRotation * new Angles( 0, -90, 90 ) );

			GameObject = DragObject;

			var spriteComponent = GameObject.Components.GetOrCreate<SpriteComponent>();
			spriteComponent.Sprite = sprite;

			EditorScene.Selection.Clear();
			EditorScene.Selection.Add( DragObject );
		}
	}
}