using Godot;
using System;

public partial class EditorTest : Control
{
	[Export] private TextureRect _textureRect;
	[Export] private Panel _dropArea;

	
	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
		// 允许接收拖拽
		MouseFilter = MouseFilterEnum.Pass;
		
		// 连接信号
		_dropArea.GuiInput += OnDropAreaGuiInput;
		
		// 设置拖拽区域属性
		_dropArea.MouseFilter = MouseFilterEnum.Pass;
		_dropArea.SizeFlagsHorizontal = SizeFlags.ExpandFill;
		_dropArea.SizeFlagsVertical = SizeFlags.ExpandFill;
		
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
	}
	
	
	public override bool _CanDropData(Vector2 at, Variant data)
	{
		// 检查拖拽的数据是否为文件路径
		if (data.VariantType == Variant.Type.String)
		{
			string filePath = data.AsString();
			return filePath.ToLower().EndsWith(".png");
		}
		return false;
	}
    
	public override void _DropData(Vector2 at, Variant data)
	{
		string filePath = data.AsString();
		LoadAndDisplayImage(filePath);
	}
	
	private void OnDropAreaGuiInput(InputEvent @event)
	{
		if (@event is InputEventMouseButton mouseEvent && 
		    mouseEvent.Pressed && 
		    mouseEvent.ButtonIndex == MouseButton.Left)
		{
			// 可以处理点击事件（可选）
		}
	}
    
	private void LoadAndDisplayImage(string filePath)
	{
		try
		{
			// 加载图片
			Image image = new Image();
			Error error = image.Load(filePath);
            
			if (error == Error.Ok)
			{
				// 创建纹理
				ImageTexture texture = ImageTexture.CreateFromImage(image);
                
				// 显示在TextureRect中
				if (_textureRect != null)
				{
					_textureRect.Texture = texture;
					GD.Print($"成功加载图片: {filePath}");
				}
			}
			else
			{
				GD.PrintErr($"加载图片失败: {error}");
			}
		}
		catch (Exception ex)
		{
			GD.PrintErr($"加载图片时出错: {ex.Message}");
		}
	}
    
	// 可选：添加一些视觉效果
	public override void _Notification(int what)
	{
		base._Notification(what);
        
		if (what == NotificationDragBegin)
		{
			// 拖拽开始时的效果
			Modulate = new Color(1, 1, 1, 0.5f);
		}
		else if (what == NotificationDragEnd)
		{
			// 拖拽结束时的效果
			Modulate = new Color(1, 1, 1, 1);
		}
	}
}