using DG.Tweening;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

[AddComponentMenu("Carousel/轮播")]
public class Carousel : MonoBehaviour
{
    public static Carousel inst;
    public bool isClick = true;
    public List<RectTransform> tfs;  //需要扩展只需往该数组添加Item即可

    public Image imageComponent;  // UI Image 组件
    public List<Sprite> imagesToDisplay;  // 要轮播的图片数组
    public int currentIndex = 0;  // 当前显示的图片索引
    public float switchInterval = 2f; // 图片切换间隔时间
    private float timer = 0f; // 计时器
    public Button close_button;


    private void Awake()
    {
        inst = this;
        gameObject.SetActive(false);
    }

    void Start()
    {
        if (imageComponent != null && imagesToDisplay.Count > 0)
        {
            imageComponent.sprite = imagesToDisplay[currentIndex]; // 设置初始图片
        }

        close_button.onClick.AddListener(() =>
        {
            gameObject.SetActive(false);
        });
    }

    void Update()
    {
        //timer += Time.deltaTime;

        //if (timer >= switchInterval)
        //{
        //    ShowNextImageWithAnimation();
        //    timer = 0f;
        //}
    }

    void ShowNextImageWithAnimation()
    {
        currentIndex = (currentIndex + 1) % imagesToDisplay.Count; // 循环获取下一张图片的索引

        // 图片切换动画
        StartCoroutine(AnimateImageChange(imagesToDisplay[currentIndex]));
    }

    IEnumerator AnimateImageChange(Sprite newImage)
    {
        // 实现图片切换动画，这里使用简单的淡入淡出效果
        float duration = 0.15f;
        float elapsedTime = 0f;
        Color originalColor = imageComponent.color;

        while (elapsedTime < duration)
        {
            imageComponent.color = Color.Lerp(originalColor, Color.clear, elapsedTime / duration);
            elapsedTime += Time.deltaTime;
            yield return null;
        }

        imageComponent.sprite = newImage;

        elapsedTime = 0f;
        while (elapsedTime < duration)
        {
            imageComponent.color = Color.Lerp(Color.clear, originalColor, elapsedTime / duration);
            elapsedTime += Time.deltaTime;
            yield return null;
        }

        imageComponent.color = originalColor;
        isClick = true;
    }

    // 外部调用该方法来动态配置要显示的图片
    public void SetImages(List<Sprite> images)
    {
        imagesToDisplay = images;
        currentIndex = 0;
        if (imageComponent != null && imagesToDisplay.Count > 0)
        {
            imageComponent.sprite = imagesToDisplay[currentIndex];
        }
    }


    public void LeftBtnClickEvent()//左边按键
    {
        if (!isClick) return;
        var num = currentIndex - 1;
        if (num < 0)
            num = imagesToDisplay.Count - 1;
        currentIndex = (num) % imagesToDisplay.Count; // 循环获取下一张图片的索引
        isClick = false;
        // 图片切换动画
        StartCoroutine(AnimateImageChange(imagesToDisplay[currentIndex]));
    }
    public void RightBtnClickEvent()//右边按键
    {
        if (!isClick) return;
        var num = currentIndex + 1;
        currentIndex = (num) % imagesToDisplay.Count; // 循环获取下一张图片的索引
        isClick = false;
        // 图片切换动画
        StartCoroutine(AnimateImageChange(imagesToDisplay[currentIndex]));
    }

}