using Godot;
using System;

namespace Chessistics.Scripts.UI;

public partial class LevelSelectScreen : Control
{
    [Signal]
    public delegate void LevelSelectedEventHandler(int levelIndex);

    private readonly (string name, string desc)[] _levels =
    [
        ("Premier Convoi", "Acheminez du bois de la scierie au depot."),
        ("Deux Clients", "Fournissez deux destinations depuis une seule scierie."),
        ("Le Col", "Franchissez le mur et gerez deux types de cargaison.")
    ];

    public override void _Ready()
    {
        // Full-screen dark background
        var bg = new PanelContainer();
        bg.SetAnchorsPreset(LayoutPreset.FullRect);
        var bgStyle = new StyleBoxFlat { BgColor = new Color(0.12f, 0.12f, 0.14f) };
        bg.AddThemeStyleboxOverride("panel", bgStyle);
        bg.MouseFilter = MouseFilterEnum.Ignore;
        AddChild(bg);

        // Outer margin
        var margin = new MarginContainer();
        margin.SetAnchorsPreset(LayoutPreset.FullRect);
        margin.AddThemeConstantOverride("margin_left", 80);
        margin.AddThemeConstantOverride("margin_right", 80);
        margin.AddThemeConstantOverride("margin_top", 60);
        margin.AddThemeConstantOverride("margin_bottom", 60);
        margin.MouseFilter = MouseFilterEnum.Ignore;

        var outerVBox = new VBoxContainer();
        outerVBox.AddThemeConstantOverride("separation", 0);
        outerVBox.MouseFilter = MouseFilterEnum.Ignore;

        // --- Header section ---
        var headerBox = new VBoxContainer();
        headerBox.AddThemeConstantOverride("separation", 4);
        headerBox.MouseFilter = MouseFilterEnum.Ignore;

        var title = new Label
        {
            Text = "CHESSISTICS",
            HorizontalAlignment = HorizontalAlignment.Center
        };
        title.AddThemeFontSizeOverride("font_size", 48);
        title.AddThemeColorOverride("font_color", new Color("#FFD700"));
        headerBox.AddChild(title);

        var subtitle = new Label
        {
            Text = "Selectionnez un niveau",
            HorizontalAlignment = HorizontalAlignment.Center
        };
        subtitle.AddThemeFontSizeOverride("font_size", 15);
        subtitle.AddThemeColorOverride("font_color", new Color("#777777"));
        headerBox.AddChild(subtitle);

        outerVBox.AddChild(headerBox);

        // Spacer
        outerVBox.AddChild(new Control { CustomMinimumSize = new Vector2(0, 48) });

        // --- Level cards ---
        var cardRow = new HBoxContainer();
        cardRow.Alignment = BoxContainer.AlignmentMode.Center;
        cardRow.AddThemeConstantOverride("separation", 28);
        cardRow.SizeFlagsVertical = SizeFlags.ExpandFill;
        cardRow.MouseFilter = MouseFilterEnum.Ignore;

        for (int i = 0; i < _levels.Length; i++)
        {
            var (name, desc) = _levels[i];
            cardRow.AddChild(CreateLevelCard(i, name, desc));
        }

        outerVBox.AddChild(cardRow);

        // Bottom spacer
        outerVBox.AddChild(new Control
        {
            SizeFlagsVertical = SizeFlags.ExpandFill,
            CustomMinimumSize = new Vector2(0, 40)
        });

        margin.AddChild(outerVBox);
        AddChild(margin);
    }

    private Control CreateLevelCard(int index, string name, string description)
    {
        var card = new PanelContainer
        {
            CustomMinimumSize = new Vector2(300, 240),
            SizeFlagsVertical = SizeFlags.ShrinkCenter
        };

        var cardStyle = new StyleBoxFlat
        {
            BgColor = new Color(0.17f, 0.17f, 0.19f),
            BorderColor = new Color(0.28f, 0.28f, 0.32f),
            BorderWidthBottom = 1,
            BorderWidthTop = 1,
            BorderWidthLeft = 1,
            BorderWidthRight = 1,
            CornerRadiusTopLeft = 8,
            CornerRadiusTopRight = 8,
            CornerRadiusBottomLeft = 8,
            CornerRadiusBottomRight = 8,
            ContentMarginLeft = 24,
            ContentMarginRight = 24,
            ContentMarginTop = 24,
            ContentMarginBottom = 24
        };
        card.AddThemeStyleboxOverride("panel", cardStyle);

        var vbox = new VBoxContainer();
        vbox.AddThemeConstantOverride("separation", 10);

        // Level number
        var numLabel = new Label
        {
            Text = $"Niveau {index + 1}",
            HorizontalAlignment = HorizontalAlignment.Center
        };
        numLabel.AddThemeFontSizeOverride("font_size", 12);
        numLabel.AddThemeColorOverride("font_color", new Color("#666666"));
        vbox.AddChild(numLabel);

        // Level name
        var nameLabel = new Label
        {
            Text = name,
            HorizontalAlignment = HorizontalAlignment.Center
        };
        nameLabel.AddThemeFontSizeOverride("font_size", 22);
        nameLabel.AddThemeColorOverride("font_color", new Color("#EEEEEE"));
        vbox.AddChild(nameLabel);

        // Thin separator
        var sep = new HSeparator { CustomMinimumSize = new Vector2(0, 4) };
        vbox.AddChild(sep);

        // Description
        var descLabel = new Label
        {
            Text = description,
            HorizontalAlignment = HorizontalAlignment.Center,
            AutowrapMode = TextServer.AutowrapMode.Word,
            CustomMinimumSize = new Vector2(240, 0)
        };
        descLabel.AddThemeFontSizeOverride("font_size", 13);
        descLabel.AddThemeColorOverride("font_color", new Color("#999999"));
        vbox.AddChild(descLabel);

        // Flexible spacer
        vbox.AddChild(new Control { SizeFlagsVertical = SizeFlags.ExpandFill });

        // Play button
        var playBtn = new Button
        {
            Text = "Jouer",
            CustomMinimumSize = new Vector2(120, 38),
            SizeFlagsHorizontal = SizeFlags.ShrinkCenter
        };

        var btnNormal = new StyleBoxFlat
        {
            BgColor = new Color("#8B6914"),
            CornerRadiusTopLeft = 6,
            CornerRadiusTopRight = 6,
            CornerRadiusBottomLeft = 6,
            CornerRadiusBottomRight = 6,
            ContentMarginLeft = 24,
            ContentMarginRight = 24,
            ContentMarginTop = 8,
            ContentMarginBottom = 8
        };
        var btnHover = new StyleBoxFlat
        {
            BgColor = new Color("#B8860B"),
            CornerRadiusTopLeft = 6,
            CornerRadiusTopRight = 6,
            CornerRadiusBottomLeft = 6,
            CornerRadiusBottomRight = 6,
            ContentMarginLeft = 24,
            ContentMarginRight = 24,
            ContentMarginTop = 8,
            ContentMarginBottom = 8
        };
        var btnPressed = new StyleBoxFlat
        {
            BgColor = new Color("#6B5010"),
            CornerRadiusTopLeft = 6,
            CornerRadiusTopRight = 6,
            CornerRadiusBottomLeft = 6,
            CornerRadiusBottomRight = 6,
            ContentMarginLeft = 24,
            ContentMarginRight = 24,
            ContentMarginTop = 8,
            ContentMarginBottom = 8
        };
        playBtn.AddThemeStyleboxOverride("normal", btnNormal);
        playBtn.AddThemeStyleboxOverride("hover", btnHover);
        playBtn.AddThemeStyleboxOverride("pressed", btnPressed);
        playBtn.AddThemeFontSizeOverride("font_size", 15);

        var idx = index;
        playBtn.Pressed += () => EmitSignal(SignalName.LevelSelected, idx);
        vbox.AddChild(playBtn);

        card.AddChild(vbox);
        return card;
    }
}