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

public class ScreenShake : MonoBehaviour
{
	[Header("摄像机")]
    public Camera mainCam;

	[Header("预览")]
	public int previewLevel;
	public bool isPreview;

	[System.Serializable]
	public struct ShakePos
    {
		[Header("第几帧震动到哪儿")]
		public int shakeFrame;
		public Vector2 camPos;
    }

	[System.Serializable]
	public struct ShakeInfo
    {
		[Header("震动等级，按顺序排，从0开始")]
		public int level;
		[Header("震动参数")]
		public int onceShakeFrame;			//单次震动帧数
		public List<ShakePos> shakePoses;
    }

	[Header("震动预设")]
    public List<ShakeInfo> shakeInfos;
	private bool isShakeCamera;

	//当前震动信息
	private List<ShakePos> shakePoses;
	
	private float shakeFrame;
	private float pastFrame;

	private void SetCurShakeInfo(int level)
    {
		shakePoses = shakeInfos[level].shakePoses;
		shakeFrame = shakeInfos[level].onceShakeFrame;
    }

	public void ShakeScreen(int level)
    {
		SetCurShakeInfo(level);
		isShakeCamera = true;
    }

    void Update()
	{
		if (isPreview)
		{
			isPreview = false;
			SetCurShakeInfo(previewLevel);
			isShakeCamera = true;
		}
		if (isShakeCamera)
		{
			if (pastFrame > shakeFrame)
			{
				isShakeCamera = false;
				transform.position = Vector2.zero;
				pastFrame = 0;
			}
			else
			{
				foreach (ShakePos sp in shakePoses)
                {
                    if (pastFrame == sp.shakeFrame)
                    {
						float x = sp.camPos.x;
						float y = sp.camPos.y;
						transform.position = new Vector2(x, y);
					}
                }
            }
			pastFrame += 1;
		}
	}
}