using BaseGames.Core.Events;
using BaseGames.Player;
using UnityEngine;

namespace BaseGames.World
{
    public enum CollectibleType { LingZhu, Item, HPOrb }

    /// <summary>
    /// 可收集物（LingZhu / 道具 / HP 球）。玩家进入触发器自动拾取。
    /// _isPersistent = true 时拾取后广播 ID 供存档记录。
    /// </summary>
    public class Collectible : MonoBehaviour
    {
        [Header("配置")]
        [SerializeField] private CollectibleType _type;
        [SerializeField] private int             _lingZhuAmount;
        [SerializeField] private string          _itemId;
        [SerializeField] private bool            _isPersistent;    // false = 敌人掉落；true = 固定位置（存档）
        [SerializeField] private string          _collectibleId;   // 持久化唯一 ID（_isPersistent = true 时填写）

        [Header("物理")]
        [SerializeField] private float _bounceForce = 5f;

        [Header("事件频道")]
        [SerializeField] private StringEventChannelSO _onCollectiblePickup;  // 道具获取（EVT_ItemPickup）
        [SerializeField] private StringEventChannelSO _onCollectibleSaved;   // 持久化记录（EVT_CollectibleSaved）

        private bool _collected;

        private void Start()
        {
            // 给予初始弹跳冲力
            var rb = GetComponent<Rigidbody2D>();
            if (rb != null)
            {
                var dir = new Vector2(Random.Range(-0.5f, 0.5f), 1f).normalized;
                rb.AddForce(dir * _bounceForce, ForceMode2D.Impulse);
            }
        }

        private void OnTriggerEnter2D(Collider2D other)
        {
            if (_collected) return;
            if (!other.CompareTag("Player")) return;

            var stats = other.GetComponentInParent<PlayerStats>();
            if (stats == null) return;

            _collected = true;

            switch (_type)
            {
                case CollectibleType.LingZhu:
                    stats.AddLingZhu(_lingZhuAmount);
                    break;

                case CollectibleType.Item:
                    _onCollectiblePickup?.Raise(_itemId);
                    break;

                case CollectibleType.HPOrb:
                    stats.HealHP(1);
                    break;
            }

            if (_isPersistent && !string.IsNullOrEmpty(_collectibleId))
                _onCollectibleSaved?.Raise(_collectibleId);

            Despawn();
        }

        private void Despawn()
        {
            // 若由对象池创建（PooledObject 存在），归还到池；否则直接停用（场景内静态放置的 Collectible）
            var po = GetComponent<Core.Pool.PooledObject>();
            if (po != null)
                po.ReturnToPool();
            else
                gameObject.SetActive(false);
        }

        // ── 运行时配置（由 CollectibleSpawner 在实例化后调用）────────────────

        /// <summary>将此 Collectible 配置为 LingZhu 採落（实例化后由 CollectibleSpawner 调用）。</summary>
        public void SetLingZhu(int amount)
        {
            _type          = CollectibleType.LingZhu;
            _lingZhuAmount = amount;
            _isPersistent  = false;
        }

        /// <summary>将此 Collectible 配置为道具掉落（实例化后由 CollectibleSpawner 调用）。</summary>
        public void SetItem(string itemId)
        {
            _type   = CollectibleType.Item;
            _itemId = itemId;
            _isPersistent = false;
        }
    }
}