/// Description Pending
using Godot;

// Description pending.
[Tool]
/// Descriptpepepl
public partial class CurvedPolygon2D: Path2D {
    [Export(PropertyHint.Range, "1,10")]
    public int MaxStages {
       get { return _maxStages; }
       set { _maxStages = value; QueueRedraw(); }
    }
    private int _maxStages = 5;
    
    [Export(PropertyHint.Range, "1.0,30.0,0.1,degrees")] 
    public float ToleranceDegrees {
        get { return _toleranceDegrees; }
        set { _toleranceDegrees = value; QueueRedraw(); }
    }
    private float _toleranceDegrees = 4.0f;

    [Export]
    private NodePath _collisionPolygon = null;
    
    [ExportGroup("Texture")]
    
    [Export]
    private Texture2D Texture {
        get { return _texture; }
        set {
            _texture = value;
            if(Engine.IsEditorHint() && Polygon != null) {
                Polygon.Texture = value;
            }
        }
    }
    private Texture2D _texture = null;

    [Export(PropertyHint.Link)]
    private Vector2 TextureScale {
        get { return _scale; }
        set {
            _scale = value;
            if(Engine.IsEditorHint() && Polygon != null) {
                Polygon.TextureScale = _scale.Inverse();
            }
        }
    }
    private Vector2 _scale = new Vector2(1.0f, 1.0f);
    
    [Export(PropertyHint.Range, "-360.0,360.0,0.1,or_less,or_greater,radians")]
    private float TextureRotation {
        get { return _rotation; }
        set {
            _rotation = value;
            if(Engine.IsEditorHint() && Polygon != null) {
                Polygon.TextureRotation = value;
            }
        }
    }
    private float _rotation = 0.0f;

    private Polygon2D _polygon = null;
    public Polygon2D Polygon {
        get {
            if(_polygon == null) {
                _polygon = (Polygon2D)FindChild("Polygon", false, false);
            }
            return _polygon;
        }
    }

    public Vector2[] RawVertices {
        get {
            return Curve.Tessellate(1, ToleranceDegrees);
        }
    }

    public override void _Ready() {
        if(Curve == null) {
            Curve = new Curve2D();
        }

        _polygon = (Polygon2D)FindChild("Polygon", false, true);
        if(_polygon == null) {
            _polygon = new Polygon2D();
            _polygon.Texture = Texture;
            _polygon.TextureScale = TextureScale.Inverse();
            _polygon.TextureFilter = TextureFilter;
            _polygon.UseParentMaterial = true;
            _polygon.Name = "Polygon";
            AddChild(_polygon);
        }
    }
    
    public override void _Draw() {
        if(Curve != null) {
            Vector2[] points = Curve.Tessellate(MaxStages, ToleranceDegrees);
            if(Polygon == null) {
                QueueRedraw();
            } else {
                Polygon.Polygon = points;
                if(_collisionPolygon != null) {
                    try {
                        GetNode<CollisionPolygon2D>(_collisionPolygon).Polygon = points;
                    } catch(System.InvalidCastException) {
                        GD.PushError("Collision Polygon attribute has to be a CollisionPolygon2D.");
                    } catch(System.NullReferenceException) {
                        GD.PushError("Invalid reference to the Collision Polygon.");
                    }
                }
            }
        }
    }
}