using System.Threading.Tasks;
using Godot;

namespace Milimoe.GodotGame;

public partial class TitleScreen : Node, ISaveSelectionEvent
{
    [Export]
    public Button StartGameButton;

    [Export]
    public Button LoadGameButton;

    [Export]
    public Button GameSettingsButton;

    [Export]
    public Button ExitGameButton;

    [Export]
    public ConfirmationDialog StartConfirmationDialog;
    
    [Export]
    public ConfirmationDialog ExitConfirmationDialog;

    [Export]
    public SavedSelection SavedSelection;

    public override async void _Ready()
    {
        ColorRect colorRect = GetNode<ColorRect>("ColorRect");
        colorRect.SelfModulate = new Color(0, 0, 0, 1);
        colorRect.Show();

        // 检查按钮是否已连接
        if (StartGameButton != null)
        {
            StartGameButton.Pressed += OnStartGameButtonPressed;
        }

        if (LoadGameButton != null)
        {
            LoadGameButton.Pressed += OnLoadGameButtonPressed;
        }

        if (GameSettingsButton != null)
        {
            GameSettingsButton.Pressed += OnGameSettingsButtonPressed;
        }
        
        if (ExitGameButton != null)
        {
            ExitGameButton.Pressed += OnExitGameButtonPressed;
        }

        if (StartConfirmationDialog != null)
        {
            StartConfirmationDialog.GetOkButton().Pressed += OnStartGameConfirmation;
        }

        if (ExitConfirmationDialog != null)
        {
            ExitConfirmationDialog.GetOkButton().Pressed += () => GetTree().Quit();
        }
        
        await FadeOutBlack(1f, true);
    }

    private async Task FadeInBlack(float fadeTime, bool hide = false)
    {
        // 淡入黑色遮罩
        ColorRect colorRect = GetNode<ColorRect>("ColorRect");
        colorRect.SelfModulate = new Color(0, 0, 0, 0);
        colorRect.Show();
        Tween tween = CreateTween();
        tween.TweenProperty(colorRect, "self_modulate", new Color(0, 0, 0, 1), fadeTime);
        await ToSignal(tween, "finished");
        if (hide) colorRect.Hide();
    }
    
    private async Task FadeOutBlack(float fadeTime, bool hide = false)
    {
        // 淡出黑色遮罩
        ColorRect colorRect = GetNode<ColorRect>("ColorRect");
        colorRect.SelfModulate = new Color(0, 0, 0, 1);
        colorRect.Show();
        Tween tween = CreateTween();
        tween.TweenProperty(colorRect, "self_modulate", new Color(0, 0, 0, 0), fadeTime);
        await ToSignal(tween, "finished");
        if (hide) colorRect.Hide();
    }

    private void OnStartGameButtonPressed()
    {
        // 开始新游戏
        GD.Print("Start New Game!");
        StartConfirmationDialog?.PopupCentered();
    }

    private void OnLoadGameButtonPressed()
    {
        // 载入游戏
        GD.Print("Load Game!");

        // 使用动画效果显示存档列表
        if (SavedSelection != null)
        {
            SavedSelection.SetIsSave(false);
            SavedSelection.Show();
            SavedSelection.GetNode<ColorRect>("ColorRect").GetNode<AnimationPlayer>("AnimationPlayer").Play("flyin");
        }
    }
    
    private async void OnStartGameConfirmation()
    {
        await FadeInBlack(1f);
        await Task.Delay(1000);
        //GetTree().Quit();

        // 加载第一章
        GD.Print("LoadTitleScene!");
        GetTree().ChangeSceneToFile("res://scenes/第一章.tscn");
    }

    private void OnGameSettingsButtonPressed()
    {
        // 打开游戏设置
        GD.Print("Open Game Settings!");
    }

    private void OnExitGameButtonPressed()
    {
        // 退出游戏
        if (ExitConfirmationDialog != null)
        {
            ExitConfirmationDialog.PopupCentered(); // 弹出对话框
        }
        else
        {
            GD.PrintErr("ExitConfirmationDialog is not connected!");
            GetTree().Quit(); // 如果对话框未连接，则直接退出
        }
    }

    public async void OnSaveSelectionClosed(bool selected, int index, bool isSave)
    {
        if (SavedSelection != null && !SavedSelection.IsClosing)
        {
            // 关闭存档选择界面
            SavedSelection.IsClosing = true;
            SavedSelection.GetNode<ColorRect>("ColorRect").GetNode<AnimationPlayer>("AnimationPlayer").Play("flyout");
            await Task.Delay(300);
            SavedSelection.IsClosing = false;
            SavedSelection.Hide();
            if (selected && index >= 0)
            {
                if (!isSave)
                {
                    // 载入游戏
                    GD.Print($"Selected Saved: {index}!");
                    await FadeInBlack(1f);
                    await Task.Delay(1000);
                    GetTree().Quit();
                }
            }
            else
            {
                GD.Print("Close SavedSelection!");
            }
        }
    }
}