using System.Collections.Generic;
using UnityEngine;

namespace BaseGames.Core.Events
{
    /// <summary>
    /// 运行时事件频道注册表。
    /// 在 Persistent 场景 Awake 时由 EventChannelRegistrar 注册所有频道 SO，
    /// 供不能持有 [SerializeField] 的动态对象（CharmEffect SO 等）按类型名查找频道。
    /// </summary>
    public class EventChannelRegistry : MonoBehaviour, IEventChannelRegistry
    {
        private readonly Dictionary<string, ScriptableObject> _channels = new();

        private void Awake()
        {
            if (BaseGames.Core.ServiceLocator.GetOrDefault<IEventChannelRegistry>() != null)
            {
                Destroy(gameObject);
                return;
            }
            BaseGames.Core.ServiceLocator.Register<IEventChannelRegistry>(this);
        }

        /// <summary>由 EventChannelRegistrar 在场景初始化时批量注册频道 SO。</summary>
        public void Register(string key, ScriptableObject channel)
            => _channels[key] = channel;

        /// <summary>
        /// 按 key 查找频道。key = SO 资产文件名（不含扩展名），如 "EVT_HitConfirmed"。
        /// </summary>
        public T Get<T>(string key) where T : ScriptableObject
        {
            if (_channels.TryGetValue(key, out var ch) && ch is T typed) return typed;
            Debug.LogError($"[EventChannelRegistry] Key '{key}' not found or wrong type ({typeof(T).Name}).");
            return null;
        }

        /// <summary>尝试获取频道，不报错。</summary>
        public bool TryGet<T>(string key, out T channel) where T : ScriptableObject
        {
            if (_channels.TryGetValue(key, out var ch) && ch is T typed)
            {
                channel = typed;
                return true;
            }
            channel = null;
            return false;
        }
    }
}