Chessistics/Scripts/Pieces/PieceView.cs

using Godot;
using Chessistics.Engine.Model;
using Chessistics.Scripts.Board;

namespace Chessistics.Scripts.Pieces;

public partial class PieceView : Node2D
{
    private Sprite2D _sprite = null!;
    private ColorRect _cargoIndicator = null!;
    private Label _label = null!;

    public int PieceId { get; private set; }
    public PieceKind Kind { get; private set; }
    public Coords StartCell { get; private set; }
    public Coords EndCell { get; private set; }

    private static readonly Color PawnColor = new("#7AB54A");
    private static readonly Color RookColor = new("#4A7AB5");
    private static readonly Color BishopColor = new("#B54A8E");
    private static readonly Color KnightColor = new("#B5824A");
    private static readonly Color WoodCargoColor = new("#8B6914");
    private static readonly Color StoneCargoColor = new("#808080");

    public void Setup(int pieceId, PieceKind kind, Coords startCell, Coords endCell, BoardView boardView)
    {
        PieceId = pieceId;
        Kind = kind;
        StartCell = startCell;
        EndCell = endCell;

        Position = boardView.CoordsToPixel(startCell);

        var color = kind switch
        {
            PieceKind.Pawn => PawnColor,
            PieceKind.Rook => RookColor,
            PieceKind.Bishop => BishopColor,
            PieceKind.Knight => KnightColor,
            _ => Colors.White
        };

        // Piece body (circle)
        _sprite = new Sprite2D();
        var texture = new GradientTexture2D
        {
            Width = 48,
            Height = 48,
            Fill = GradientTexture2D.FillEnum.Radial,
            Gradient = new Gradient()
        };
        texture.Gradient.SetColor(0, color);
        texture.Gradient.SetColor(1, color.Darkened(0.3f));
        _sprite.Texture = texture;
        AddChild(_sprite);

        // Label
        _label = new Label
        {
            Text = kind switch
            {
                PieceKind.Pawn => "P",
                PieceKind.Rook => "T",
                PieceKind.Bishop => "F",
                PieceKind.Knight => "C",
                _ => "?"
            },
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center,
            Position = new Vector2(-8, -10),
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        _label.AddThemeFontSizeOverride("font_size", 16);
        _label.AddThemeColorOverride("font_color", Colors.White);
        AddChild(_label);

        // Cargo indicator (hidden by default)
        _cargoIndicator = new ColorRect
        {
            Size = new Vector2(14, 14),
            Position = new Vector2(-7, -30),
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_cargoIndicator);
    }

    public void SetCargo(CargoType? cargo)
    {
        if (cargo == null)
        {
            _cargoIndicator.Visible = false;
            return;
        }

        _cargoIndicator.Visible = true;
        _cargoIndicator.Color = cargo.Value switch
        {
            CargoType.Wood => WoodCargoColor,
            CargoType.Stone => StoneCargoColor,
            _ => Colors.White
        };
    }

    public void AnimateMoveTo(Vector2 target, float duration = 0.3f)
    {
        var tween = CreateTween();
        if (Kind == PieceKind.Knight)
        {
            // Arc animation for knight
            var mid = (Position + target) / 2 + new Vector2(0, -30);
            tween.TweenMethod(Callable.From<float>(t =>
            {
                var a = Position.Lerp(mid, t);
                var b = mid.Lerp(target, t);
                Position = a.Lerp(b, t);
            }), 0f, 1f, duration);
            tween.Finished += () => Position = target;
        }
        else
        {
            tween.TweenProperty(this, "position", target, duration);
        }
    }
}