Chessistics/Scripts/Board/CellView.cs

using Godot;
using Chessistics.Engine.Model;

namespace Chessistics.Scripts.Board;

public partial class CellView : Node2D
{
    private ColorRect _background = null!;
    private ColorRect _highlight = null!;
    private Label _label = null!;

    // Hover outline (4 thin rects forming a border)
    private ColorRect _hoverTop = null!;
    private ColorRect _hoverBottom = null!;
    private ColorRect _hoverLeft = null!;
    private ColorRect _hoverRight = null!;

    public Coords Coords { get; private set; }

    private static readonly Color LightColor = new("#F0D9B5");
    private static readonly Color DarkColor = new("#B58863");
    private static readonly Color WallColor = new("#555555");
    private static readonly Color ProductionColor = new("#6B8E5A");
    private static readonly Color DemandColor = new("#C9A833");
    private static readonly Color HighlightColor = new("#44FF4444");
    private static readonly Color HoverOutlineColor = new("#FFFFFFAA");

    private const int OutlineWidth = 2;

    public void Setup(Coords coords, CellType cellType, int cellSize)
    {
        Coords = coords;
        Position = new Vector2(coords.Col * cellSize, -coords.Row * cellSize);

        _background = new ColorRect
        {
            Size = new Vector2(cellSize, cellSize),
            Position = Vector2.Zero,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };

        var baseColor = coords.IsLight ? LightColor : DarkColor;
        _background.Color = cellType switch
        {
            CellType.Wall => WallColor,
            CellType.Production => ProductionColor,
            CellType.Demand => DemandColor,
            _ => baseColor
        };
        AddChild(_background);

        _highlight = new ColorRect
        {
            Size = new Vector2(cellSize, cellSize),
            Position = Vector2.Zero,
            Color = HighlightColor,
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_highlight);

        // Hover outline (4 border rects)
        _hoverTop = new ColorRect
        {
            Size = new Vector2(cellSize, OutlineWidth),
            Position = Vector2.Zero,
            Color = HoverOutlineColor,
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_hoverTop);

        _hoverBottom = new ColorRect
        {
            Size = new Vector2(cellSize, OutlineWidth),
            Position = new Vector2(0, cellSize - OutlineWidth),
            Color = HoverOutlineColor,
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_hoverBottom);

        _hoverLeft = new ColorRect
        {
            Size = new Vector2(OutlineWidth, cellSize),
            Position = Vector2.Zero,
            Color = HoverOutlineColor,
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_hoverLeft);

        _hoverRight = new ColorRect
        {
            Size = new Vector2(OutlineWidth, cellSize),
            Position = new Vector2(cellSize - OutlineWidth, 0),
            Color = HoverOutlineColor,
            Visible = false,
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        AddChild(_hoverRight);

        _label = new Label
        {
            Position = new Vector2(2, 2),
            Text = "",
            MouseFilter = Control.MouseFilterEnum.Ignore
        };
        _label.AddThemeFontSizeOverride("font_size", 10);
        AddChild(_label);
    }

    public void SetLabel(string text) => _label.Text = text;
    public void SetHighlight(bool on) => _highlight.Visible = on;

    public void SetHover(bool on)
    {
        _hoverTop.Visible = on;
        _hoverBottom.Visible = on;
        _hoverLeft.Visible = on;
        _hoverRight.Visible = on;
    }

    public void SetHighlightColor(Color color)
    {
        _highlight.Color = color;
        _highlight.Visible = true;
    }

    /// <summary>
    /// Brief white flash on the cell to signal production.
    /// </summary>
    public void FlashProduce(float duration = 0.3f)
    {
        _highlight.Color = new Color(1, 1, 1, 0.5f);
        _highlight.Visible = true;
        var tween = CreateTween();
        tween.TweenProperty(_highlight, "color", new Color(1, 1, 1, 0f), duration);
        tween.TweenCallback(Callable.From(() => _highlight.Visible = false));
    }
}