using System;
using System.Threading.Tasks;
using Godot;

namespace Milimoe.GodotGame;

public partial class SplashScreen : Node
{
    [Export]
    public TextureRect GodotLogo;

    [Export]
    public TextureRect Logo;

    [Export]
    public Label Label;

    [Export]
    public float FadeDuration = 0.5f; // 淡入/淡出持续时间 (秒)

    [Export]
    public float VisibleDuration = 2.0f; // 显示时间 (秒)

    [Export]
    public string TitleScenePath = "res://scenes/TitleScreen.tscn"; // 标题场景的路径

    private Color _initialGodotColor;
    private Color _initialLogoColor;
    private Color _initialLabelColor;

    public override void _Ready()
    {
        // 检查节点是否为空
        if (GodotLogo == null || Logo == null || Label == null)
        {
            GD.PrintErr("请在编辑器中指定 GodotLogo, Logo, Label 节点！");
            return;
        }

        // 保存初始颜色
        _initialGodotColor = GodotLogo.SelfModulate;
        _initialLogoColor = Logo.SelfModulate;
        _initialLabelColor = Label.SelfModulate;

        // 初始时，隐藏 Raincandy 和 Milimoe
        Logo.SelfModulate = new Color(_initialLogoColor.R, _initialLogoColor.G, _initialLogoColor.B, 0.0f);
        Label.SelfModulate = new Color(_initialLabelColor.R, _initialLabelColor.G, _initialLabelColor.B, 0.0f);

        // 显示 Godot Logo
        GodotLogo.SelfModulate = new Color(_initialGodotColor.R, _initialGodotColor.G, _initialGodotColor.B, 1.0f);

        // 开始流程
        StartSequence();
    }

    private async void StartSequence()
    {
        // 等待一段时间
        await Task.Delay(TimeSpan.FromSeconds(VisibleDuration));

        // 淡出 Godot Logo
        await FadeOutGodot();

        // 淡入 Raincandy Logo 和 Milimoe Label
        await FadeInRaincandy();

        // 等待一段时间
        await Task.Delay(TimeSpan.FromSeconds(VisibleDuration));

        // 淡出 Raincandy Logo 和 Milimoe Label
        await FadeOutRaincandy();
    }

    private async Task FadeOutGodot()
    {
        Tween tween = CreateTween();
        Color targetColor = new(_initialGodotColor.R, _initialGodotColor.G, _initialGodotColor.B, 0.0f);
        tween.TweenProperty(GodotLogo, "self_modulate", targetColor, FadeDuration);
        await ToSignal(tween, "finished");
    }

    private async Task FadeInRaincandy()
    {
        Tween tween = CreateTween();

        // 淡入 Raincandy Logo
        Color targetRaincandyColor = new(_initialLogoColor.R, _initialLogoColor.G, _initialLogoColor.B, 1.0f);
        tween.TweenProperty(Logo, "self_modulate", targetRaincandyColor, FadeDuration);

        // 同时淡入 Milimoe Label
        Color targetMilimoeColor = new(_initialLabelColor.R, _initialLabelColor.G, _initialLabelColor.B, 1.0f);
        tween.Parallel().TweenProperty(Label, "self_modulate", targetMilimoeColor, FadeDuration);

        await ToSignal(tween, "finished");
    }

    private async Task FadeOutRaincandy()
    {
        Tween tween = CreateTween();

        // 淡出 Raincandy Logo
        Color targetRaincandyColor = new(_initialLogoColor.R, _initialLogoColor.G, _initialLogoColor.B, 0.0f);
        tween.TweenProperty(Logo, "self_modulate", targetRaincandyColor, FadeDuration);

        // 同时淡出 Milimoe Label
        Color targetMilimoeColor = new(_initialLabelColor.R, _initialLabelColor.G, _initialLabelColor.B, 0.0f);
        tween.Parallel().TweenProperty(Label, "self_modulate", targetMilimoeColor, FadeDuration);

        tween.TweenProperty(GetNode<ColorRect>("ColorRect"), "self_modulate", new Color(0, 0, 0, 1), 0.5f);

        await ToSignal(tween, "finished");

        // 加载游戏常量
        GameConstant.InitGame();

        // 加载标题场景
        GD.Print("LoadTitleScene!");
        GetTree().ChangeSceneToFile(TitleScenePath);
    }
}