using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class ChangeScene : MonoBehaviour
{
    public static ChangeScene instance;

    public float fadeSpeed = 1.5f;

    private bool startFadeToClear = false;

    private bool startFadeToBlack = false;

    private RawImage rawImage;

    private Action tempAction;
    void Awake()
    {
        instance = this;
    }
    void Start()
    {

        rawImage = GetComponent<RawImage>();

    }

    void Update()
    {
        if (startFadeToClear)
            FadeToClear();

        if (startFadeToBlack)
            FadeToBlack();
    }

    //显示
    private void FadeToClear()
    {
        rawImage.color = Color.Lerp(rawImage.color, Color.clear, fadeSpeed * Time.deltaTime);
        if (rawImage.color.a < 0.1f)
        {
            rawImage.color = Color.clear;
            rawImage.enabled = false;
            startFadeToClear = false;
            Debug.Log(tempAction);
            if (tempAction != null)
            {
                tempAction.Invoke();
            }
        }
    }

    //渐黑
    private void FadeToBlack()
    {
        rawImage.color = Color.Lerp(rawImage.color, Color.black, fadeSpeed * 2 *Time.deltaTime);
        if (rawImage.color.a > 0.95f)
        {
            rawImage.color = Color.black;
            rawImage.enabled = true;
            startFadeToBlack = false;
            Debug.Log(tempAction);
            if (tempAction != null)
            {
                tempAction.Invoke();
            }
        }
    }

    public void StartFadeBlack()
    {
        tempAction = null;
        rawImage.enabled = true;
        startFadeToBlack = true;
        tempAction = FadeToClear;
    }

    public void StartFadeBlack(Action a)
    {
        tempAction = null;
        rawImage.enabled = true;
        startFadeToBlack = true;
        tempAction = a;
    }

    public void StartFadeClear(Action a)
    {
        tempAction = null;
        rawImage.enabled = true;
        startFadeToClear = true;
        tempAction = a;
    }

}