using Godot;
using Chessistics.Engine.Model;

namespace Chessistics.Scripts.UI;

public partial class MetricsOverlay : PanelContainer
{
    [Signal]
    public delegate void NextLevelPressedEventHandler();
    [Signal]
    public delegate void RetryPressedEventHandler();

    private Label _titleLabel = null!;
    private Label _piecesLabel = null!;
    private Label _turnsLabel = null!;
    private Label _cellsLabel = null!;
    private HBoxContainer _buttons = null!;

    public override void _Ready()
    {
        var style = new StyleBoxFlat
        {
            BgColor = new Color(0.1f, 0.1f, 0.12f, 0.95f),
            BorderColor = new Color("#B8942A"),
            BorderWidthBottom = 2, BorderWidthTop = 2,
            BorderWidthLeft = 2, BorderWidthRight = 2,
            CornerRadiusTopLeft = 12, CornerRadiusTopRight = 12,
            CornerRadiusBottomLeft = 12, CornerRadiusBottomRight = 12,
            ContentMarginLeft = 32, ContentMarginRight = 32,
            ContentMarginTop = 28, ContentMarginBottom = 28
        };
        AddThemeStyleboxOverride("panel", style);

        var vbox = new VBoxContainer();
        vbox.AddThemeConstantOverride("separation", 8);

        _titleLabel = new Label
        {
            Text = "VICTOIRE !",
            HorizontalAlignment = HorizontalAlignment.Center
        };
        _titleLabel.AddThemeFontSizeOverride("font_size", 26);
        _titleLabel.AddThemeColorOverride("font_color", new Color("#FFD700"));
        vbox.AddChild(_titleLabel);

        vbox.AddChild(new HSeparator());

        _piecesLabel = CreateMetricLabel();
        vbox.AddChild(_piecesLabel);
        _turnsLabel = CreateMetricLabel();
        vbox.AddChild(_turnsLabel);
        _cellsLabel = CreateMetricLabel();
        vbox.AddChild(_cellsLabel);

        vbox.AddChild(new HSeparator());

        _buttons = new HBoxContainer { Alignment = BoxContainer.AlignmentMode.Center };
        _buttons.AddThemeConstantOverride("separation", 16);

        var retryBtn = CreateStyledButton("Rejouer");
        retryBtn.Pressed += () => EmitSignal(SignalName.RetryPressed);
        _buttons.AddChild(retryBtn);

        var nextBtn = CreateStyledButton("Niveau suivant");
        nextBtn.Pressed += () => EmitSignal(SignalName.NextLevelPressed);
        _buttons.AddChild(nextBtn);

        vbox.AddChild(_buttons);
        AddChild(vbox);

        Visible = false;
    }

    public void ShowMetrics(Metrics metrics)
    {
        _piecesLabel.Text = $"Pieces utilisees: {metrics.PiecesUsed}";
        _turnsLabel.Text = $"Coups: {metrics.TurnsTaken}";
        _cellsLabel.Text = $"Cases occupees: {metrics.CellsOccupied}";

        // Start invisible, fade + scale in
        Modulate = new Color(1, 1, 1, 0);
        Scale = new Vector2(0.85f, 0.85f);
        PivotOffset = Size / 2f;
        Visible = true;

        // Hide metrics initially, reveal sequentially
        _piecesLabel.Modulate = new Color(1, 1, 1, 0);
        _turnsLabel.Modulate = new Color(1, 1, 1, 0);
        _cellsLabel.Modulate = new Color(1, 1, 1, 0);
        _buttons.Modulate = new Color(1, 1, 1, 0);

        var tween = CreateTween();
        // Panel fade in
        tween.SetParallel(true);
        tween.TweenProperty(this, "modulate:a", 1f, 0.3f)
            .SetEase(Tween.EaseType.Out);
        tween.TweenProperty(this, "scale", Vector2.One, 0.35f)
            .SetEase(Tween.EaseType.Out).SetTrans(Tween.TransitionType.Back);
        tween.SetParallel(false);

        // Sequential metric reveals
        tween.TweenInterval(0.15f);
        tween.TweenProperty(_piecesLabel, "modulate:a", 1f, 0.2f);
        tween.TweenInterval(0.1f);
        tween.TweenProperty(_turnsLabel, "modulate:a", 1f, 0.2f);
        tween.TweenInterval(0.1f);
        tween.TweenProperty(_cellsLabel, "modulate:a", 1f, 0.2f);
        tween.TweenInterval(0.15f);
        tween.TweenProperty(_buttons, "modulate:a", 1f, 0.2f);
    }

    public new void Hide()
    {
        Visible = false;
    }

    private static Label CreateMetricLabel()
    {
        var label = new Label
        {
            Text = "",
            HorizontalAlignment = HorizontalAlignment.Center
        };
        label.AddThemeFontSizeOverride("font_size", 14);
        label.AddThemeColorOverride("font_color", new Color("#CCCCCC"));
        return label;
    }

    private static Button CreateStyledButton(string text)
    {
        var btn = new Button
        {
            Text = text,
            CustomMinimumSize = new Vector2(130, 36)
        };

        var normal = new StyleBoxFlat
        {
            BgColor = new Color("#3D6B8E"),
            CornerRadiusTopLeft = 6, CornerRadiusTopRight = 6,
            CornerRadiusBottomLeft = 6, CornerRadiusBottomRight = 6,
            ContentMarginLeft = 16, ContentMarginRight = 16,
            ContentMarginTop = 6, ContentMarginBottom = 6
        };
        var hover = new StyleBoxFlat
        {
            BgColor = new Color("#4A8EBF"),
            CornerRadiusTopLeft = 6, CornerRadiusTopRight = 6,
            CornerRadiusBottomLeft = 6, CornerRadiusBottomRight = 6,
            ContentMarginLeft = 16, ContentMarginRight = 16,
            ContentMarginTop = 6, ContentMarginBottom = 6
        };
        btn.AddThemeStyleboxOverride("normal", normal);
        btn.AddThemeStyleboxOverride("hover", hover);
        btn.AddThemeFontSizeOverride("font_size", 13);

        return btn;
    }
}