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 _shadow = null!;
    private Sprite2D _sprite = null!;
    private ColorRect _cargoIndicator = null!;
    private Label _label = null!;
    private Tween? _cargoPulseTween;

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

    // Muted, earthy palette — teal, sienna, gold tones
    private static readonly Color PawnColor = new("#5A8C6B");     // sage green
    private static readonly Color RookColor = new("#3D6B8E");     // deep teal
    private static readonly Color BishopColor = new("#8E5A6B");   // dusty rose
    private static readonly Color KnightColor = new("#8E7A3D");   // burnt sienna
    private static readonly Color WoodCargoColor = new("#A67C32");
    private static readonly Color StoneCargoColor = new("#7A7A7A");
    private static readonly Color ShadowColor = new Color(0, 0, 0, 0.18f);

    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 = GetPieceColor(kind);

        // Shadow (slightly offset, rendered first)
        _shadow = new Sprite2D();
        var shadowTex = new GradientTexture2D
        {
            Width = 44, Height = 44,
            Fill = GradientTexture2D.FillEnum.Radial,
            Gradient = new Gradient()
        };
        shadowTex.Gradient.SetColor(0, ShadowColor);
        shadowTex.Gradient.SetColor(1, new Color(0, 0, 0, 0));
        _shadow.Texture = shadowTex;
        _shadow.Position = new Vector2(3, 5); // subtle offset down-right
        AddChild(_shadow);

        // Piece body (circle with inner glow)
        _sprite = new Sprite2D();
        var texture = new GradientTexture2D
        {
            Width = 48, Height = 48,
            Fill = GradientTexture2D.FillEnum.Radial,
            Gradient = new Gradient()
        };
        texture.Gradient.Colors = [
            color.Lightened(0.15f),  // bright center
            color,                    // main color
            color.Darkened(0.25f)     // dark rim
        ];
        texture.Gradient.Offsets = [0f, 0.5f, 1f];
        _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", new Color(1, 1, 1, 0.9f));
        AddChild(_label);

        // Cargo indicator (hidden by default)
        _cargoIndicator = new ColorRect
        {
            Size = new Vector2(12, 12),
            Position = new Vector2(-6, -28),
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_cargoIndicator);

        // Entrance animation: scale bounce
        Scale = Vector2.Zero;
        var entranceTween = CreateTween();
        entranceTween.TweenProperty(this, "scale", new Vector2(1.15f, 1.15f), 0.12f)
            .SetEase(Tween.EaseType.Out).SetTrans(Tween.TransitionType.Back);
        entranceTween.TweenProperty(this, "scale", Vector2.One, 0.08f)
            .SetEase(Tween.EaseType.InOut);
    }

    public static Color GetPieceColor(PieceKind kind) => kind switch
    {
        PieceKind.Pawn => PawnColor,
        PieceKind.Rook => RookColor,
        PieceKind.Bishop => BishopColor,
        PieceKind.Knight => KnightColor,
        _ => Colors.White
    };

    public void SetCargo(CargoType? cargo)
    {
        _cargoPulseTween?.Kill();
        _cargoPulseTween = null;

        if (cargo == null)
        {
            _cargoIndicator.Visible = false;
            _cargoIndicator.Scale = Vector2.One;
            return;
        }

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

        // Cargo pulse: gentle breathing
        _cargoPulseTween = CreateTween();
        _cargoPulseTween.SetLoops();
        _cargoPulseTween.TweenProperty(_cargoIndicator, "scale",
            new Vector2(1.25f, 1.25f), 0.5f)
            .SetEase(Tween.EaseType.InOut).SetTrans(Tween.TransitionType.Sine);
        _cargoPulseTween.TweenProperty(_cargoIndicator, "scale",
            Vector2.One, 0.5f)
            .SetEase(Tween.EaseType.InOut).SetTrans(Tween.TransitionType.Sine);
    }

    public void AnimateMoveTo(Vector2 target, float duration = 0.3f)
    {
        var tween = CreateTween();
        if (Kind == PieceKind.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)
                .SetEase(Tween.EaseType.InOut).SetTrans(Tween.TransitionType.Sine);
        }
    }
}