using Godot;
using System;
using Chessistics.Engine.Model;

namespace Chessistics.Scripts.UI;

public partial class ControlBar : HBoxContainer
{
    [Signal]
    public delegate void PlayPressedEventHandler();
    [Signal]
    public delegate void PausePressedEventHandler();
    [Signal]
    public delegate void StepPressedEventHandler();
    [Signal]
    public delegate void StopPressedEventHandler();
    [Signal]
    public delegate void SpeedChangedEventHandler(float speed);

    private Button _playButton = null!;
    private Button _pauseButton = null!;
    private Button _stepButton = null!;
    private Button _stopButton = null!;
    private OptionButton _speedSelect = null!;
    private Label _turnLabel = null!;

    private static readonly Color BtnBg = new("#2A2A2E");
    private static readonly Color BtnHover = new("#3A3A40");
    private static readonly Color BtnPressed = new("#1A1A1E");
    private static readonly Color BtnDisabled = new("#1E1E20");
    private static readonly Color BtnBorder = new("#444448");

    public override void _Ready()
    {
        AddThemeConstantOverride("separation", 8);

        _playButton = CreateStyledButton("PLAY");
        _playButton.Pressed += () => EmitSignal(SignalName.PlayPressed);
        AddChild(_playButton);

        _pauseButton = CreateStyledButton("PAUSE");
        _pauseButton.Pressed += () => EmitSignal(SignalName.PausePressed);
        AddChild(_pauseButton);

        _stepButton = CreateStyledButton("STEP");
        _stepButton.Pressed += () => EmitSignal(SignalName.StepPressed);
        AddChild(_stepButton);

        _stopButton = CreateStyledButton("STOP");
        _stopButton.Pressed += () => EmitSignal(SignalName.StopPressed);
        AddChild(_stopButton);

        // Spacer
        AddChild(new Control { CustomMinimumSize = new Vector2(12, 0) });

        _speedSelect = new OptionButton { CustomMinimumSize = new Vector2(60, 30) };
        _speedSelect.AddItem("x1", 0);
        _speedSelect.AddItem("x2", 1);
        _speedSelect.AddItem("x4", 2);
        _speedSelect.ItemSelected += OnSpeedSelected;
        AddChild(_speedSelect);

        // Spacer
        AddChild(new Control { SizeFlagsHorizontal = SizeFlags.ExpandFill });

        _turnLabel = new Label { Text = "Coup: --" };
        _turnLabel.AddThemeFontSizeOverride("font_size", 13);
        _turnLabel.AddThemeColorOverride("font_color", new Color("#999999"));
        AddChild(_turnLabel);

        UpdateForPhase(SimPhase.Edit);
    }

    private static Button CreateStyledButton(string text)
    {
        var btn = new Button
        {
            Text = text,
            CustomMinimumSize = new Vector2(70, 30)
        };
        btn.AddThemeFontSizeOverride("font_size", 11);

        var normal = MakeStyle(BtnBg);
        var hover = MakeStyle(BtnHover);
        var pressed = MakeStyle(BtnPressed);
        var disabled = MakeStyle(BtnDisabled);
        disabled.BorderColor = new Color("#2A2A2E");

        btn.AddThemeStyleboxOverride("normal", normal);
        btn.AddThemeStyleboxOverride("hover", hover);
        btn.AddThemeStyleboxOverride("pressed", pressed);
        btn.AddThemeStyleboxOverride("disabled", disabled);
        btn.AddThemeColorOverride("font_disabled_color", new Color("#555555"));

        return btn;
    }

    private static StyleBoxFlat MakeStyle(Color bg)
    {
        return new StyleBoxFlat
        {
            BgColor = bg,
            BorderColor = BtnBorder,
            BorderWidthBottom = 1, BorderWidthTop = 1,
            BorderWidthLeft = 1, BorderWidthRight = 1,
            CornerRadiusTopLeft = 4, CornerRadiusTopRight = 4,
            CornerRadiusBottomLeft = 4, CornerRadiusBottomRight = 4,
            ContentMarginLeft = 10, ContentMarginRight = 10,
            ContentMarginTop = 4, ContentMarginBottom = 4
        };
    }

    private void OnSpeedSelected(long index)
    {
        float speed = index switch
        {
            0 => 1.0f,
            1 => 0.5f,
            2 => 0.25f,
            _ => 1.0f
        };
        EmitSignal(SignalName.SpeedChanged, speed);
    }

    public void UpdateForPhase(SimPhase phase)
    {
        _playButton.Disabled = phase != SimPhase.Edit && phase != SimPhase.Paused;
        _pauseButton.Disabled = phase != SimPhase.Running;
        _stepButton.Disabled = phase == SimPhase.Running || phase == SimPhase.Victory || phase == SimPhase.Defeat;
        _stopButton.Disabled = phase == SimPhase.Edit;
    }

    public void UpdateTurn(int turn)
    {
        _turnLabel.Text = $"Coup: {turn}";
    }

    public void ResetTurn()
    {
        _turnLabel.Text = "Coup: --";
    }
}