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

[System.Serializable]
public class ParallaxLayerConfig
{
    public GameObject layer; // 背景层的游戏对象
    public float scrollSpeed; // 每层的滚动速度
    public float scrollOffset; // 每层的滚动偏移量
}


public class ParallaxManager : MonoBehaviour
{
    public ParallaxLayerConfig[] layerConfigs; // 背景层配置数组
    public ParallaxObjectCategoryConfig[] categoryConfigs; // 多种物体配置类别
    public float speedMultiplier = 1; // 加速系数

    private Dictionary<string, List<GameObject>> objectPools = new Dictionary<string, List<GameObject>>(); // 物体池

    void Start()
    {
        // 初始化背景层滚动
        foreach (var config in layerConfigs)
        {
            StartLayerScroll(config);
        }

        // 初始化物体池并启动物体生成逻辑
        foreach (var category in categoryConfigs)
        {
            InitializeObjectPool(category);
            if (category.useIntervalGeneration)
            {
                StartCoroutine(ManageObjectGeneration(category));
            }
            else
            {
                // 按照距离生成
                StartCoroutine(ManageObjectGenerationByDistance(category));
            }
            // category.SpawnObjects(this); // 启动物体生成
        }
    }

    // 初始化物体池
    private void InitializeObjectPool(ParallaxObjectCategoryConfig categoryConfig)
    {
        List<GameObject> pool = new List<GameObject>();
        for (int i = 0; i < categoryConfig.objects.Length; i++)
        {
            GameObject prefab = categoryConfig.objects[i];
            GameObject obj = Instantiate(prefab, prefab.transform.position, Quaternion.identity, transform);
            obj.SetActive(false);
            pool.Add(obj);
        }
        objectPools[categoryConfig.categoryName] = pool;

        Debug.Log($"为分类 {categoryConfig.categoryName} 初始化池子，池中物体数：{pool.Count}");
    }

    // 开始背景层滚动
    private void StartLayerScroll(ParallaxLayerConfig config)
    {
        Vector3 startPosition = config.layer.transform.position;
        float endPositionX = startPosition.x - config.scrollOffset;

        config.layer.transform.DOLocalMoveX(endPositionX, config.scrollSpeed * speedMultiplier)
            .SetEase(Ease.Linear)
            .OnKill(() => ResetLayerPosition(config));
    }

    // 重置背景层位置
    private void ResetLayerPosition(ParallaxLayerConfig config)
    {
        Vector3 currentPosition = config.layer.transform.position;
        config.layer.transform.position = new Vector3(currentPosition.x + config.scrollOffset * 2, currentPosition.y, currentPosition.z);

        StartLayerScroll(config);
    }

    // 管理物体生成（基于距离）
    public IEnumerator ManageObjectGenerationByDistance(ParallaxObjectCategoryConfig categoryConfig)
    {
        var pool = objectPools[categoryConfig.categoryName];
        GameObject firstObject = pool[0];
        if (!firstObject.activeInHierarchy)
        {
            firstObject.transform.position = categoryConfig.objects[0].transform.position;
            firstObject.SetActive(true);
            StartObjectMoveAnimation(firstObject, categoryConfig);
            Debug.Log($"生成了第一个物体: {firstObject.name}, 位置: {firstObject.transform.position}");
        }
        GameObject lastObject = firstObject;
        //GameObject lastObject = null;

        while (true)
        {
            // 检查是否需要生成新物体
            if (lastObject == null || lastObject.transform.position.x < categoryConfig.generationThreshold)
            {
                GameObject obj = GetInactiveObjectFromPool(categoryConfig.categoryName);
                if (obj != null)
                {
                    SpawnObject(obj, categoryConfig);
                    lastObject = obj;
                }
            }
            yield return null;
        }
    }
    // 管理物体生成：按时间间隔生成
public IEnumerator ManageObjectGeneration(ParallaxObjectCategoryConfig categoryConfig)
{
    if (!objectPools.ContainsKey(categoryConfig.categoryName))
    {
        Debug.LogError($"没有为分类 {categoryConfig.categoryName} 初始化对象池！");
        yield break;
    }

    var pool = objectPools[categoryConfig.categoryName];

    // // 初始化生成第一个物体
    // GameObject firstObject = pool.Find(o => !o.activeInHierarchy);
    // if (firstObject != null)
    // {   
    //     firstObject.SetActive(true);
    //     StartObjectMoveAnimation(firstObject, categoryConfig);
    //     //SpawnObject(firstObject, categoryConfig);
    //     Debug.Log($"初始生成物体: {firstObject.name}, 位置: {firstObject.transform.position}");
    // }
    // else
    // {
    //     Debug.LogWarning($"对象池 {categoryConfig.categoryName} 没有可用的初始物体！");
    // }

    // 持续生成物体
    while (true)
    {

        yield return new WaitForSeconds(categoryConfig.spawnInterval);
        // 从池中查找未激活的对象
        // GameObject obj = pool.Find(o => !o.activeInHierarchy);
        GameObject obj = GetInactiveObjectFromPool(categoryConfig.categoryName);
        if (obj != null)
        {
            SpawnObject(obj, categoryConfig);
            Debug.Log($"生成物体: {obj.name}, 当前池大小: {pool.Count}");
        }
        else
        {
            Debug.LogWarning($"对象池 {categoryConfig.categoryName} 中没有可用物体！可能需要增加池中物体数量。");
        }
        
    }
}

    // 获取池中未激活的物体
    private GameObject GetInactiveObjectFromPool(string categoryName)
    {
        if (objectPools.TryGetValue(categoryName, out var pool))
        {
            // 筛选出所有未激活的对象
            var inactiveObjects = pool.FindAll(o => !o.activeInHierarchy);

            if (inactiveObjects.Count > 0)
            {
                // 从未激活的对象中随机选择一个
                return inactiveObjects[Random.Range(0, inactiveObjects.Count)];
            }
        }
        return null; // 如果没有未激活的对象
    }


    // 生成物体逻辑
    private void SpawnObject(GameObject obj, ParallaxObjectCategoryConfig categoryConfig)
    {
        float xStart = categoryConfig.xSpawnRange;
        //float yStart = obj.objects; // 可配置的随机高度范围
        obj.transform.position = new Vector3(xStart, obj.transform.position.y, obj.transform.position.z);
        obj.SetActive(true);

        StartObjectMoveAnimation(obj, categoryConfig);
    }

    // 启动物体移动动画
    private void StartObjectMoveAnimation(GameObject obj, ParallaxObjectCategoryConfig config)
    {
        float endX = -config.xSpawnRange;
        obj.transform.DOMoveX(endX, config.speed * speedMultiplier)
            .SetEase(Ease.Linear)
            .OnKill(() =>
            {
                obj.SetActive(false);
                Debug.Log($"物体 {obj.name} 动画结束，回收到池中");
            });
    }
}