using Godot;

/// <summary>
///     场景过渡控制器
/// </summary>
public partial class SceneTransit : CanvasLayer {
    // Called when the node enters the scene tree for the first time.
    /// <summary>
    ///     场景加载完成时调用
    /// </summary>
    public override void _Ready() {
        Layer = -1;
        Hide();
    }

    // Called every frame. 'delta' is the elapsed time since the previous frame.
    /// <summary>
    ///     每帧更新
    /// </summary>
    /// <param name="delta">帧间隔</param>
    public override void _Process(double delta) { }

    /// <summary>
    ///     切换场景
    /// </summary>
    /// <param name="nextScene">下一场景路径</param>
    /// <param name="needLoadResources">是否需要加载资源</param>
    /// <param name="animation">过渡动画名称</param>
    /// <param name="waitSecond">等待时间</param>
    public async void Transit(string nextScene, bool needLoadResources = true, string animation = "transit",
        float waitSecond = 0) {
        SetProcess(true);
        GameManager.NextScene = nextScene;
        var ap = GetNode<AnimationPlayer>("AnimationPlayer");
        Layer = 9999;
        Show();
        ap.Play(animation);
        await ToSignal(ap, AnimationMixer.SignalName.AnimationFinished);
        if (waitSecond > 0) await ToSignal(GetTree().CreateTimer(waitSecond), SceneTreeTimer.SignalName.Timeout);
        if (needLoadResources)
            GetTree().ChangeSceneToFile("res://scenes/loader.tscn");
        else
            GetTree().ChangeSceneToFile(nextScene);
        ap.PlayBackwards(animation);
        await ToSignal(ap, AnimationMixer.SignalName.AnimationFinished);
        Layer = -1;
        Hide();
        SetProcess(false);
    }
}