using Godot;
using System;

/// <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);
	}

}