using System.Collections.Generic;
using Sirenix.OdinInspector;
using UnityEngine;

namespace Ichni.Story
{
    /// <summary>
    /// 全局角色注册表（ScriptableObject）。
    /// 按 characterId 索引所有 <see cref="CharacterData"/>，
    /// 运行时提供带缓存的快速查找。
    /// </summary>
    [CreateAssetMenu(fileName = "CharacterRegistry", menuName = "Ichni/Story/New/CharacterRegistry")]
    public class CharacterRegistry : SerializedScriptableObject
    {
        [LabelText("Characters")]
        [ListDrawerSettings(ShowFoldout = true, DraggableItems = true)]
        [InfoBox("将所有角色的 CharacterData 资产拖入此列表，系统运行时会自动按 characterId 建立索引。")]
        public List<CharacterData> characters = new List<CharacterData>();

        // 运行时缓存，首次 TryGet 时延迟构建
        private Dictionary<string, CharacterData> _cache;

        /// <summary>
        /// 根据 characterId 查找角色数据，找到时返回 true 并通过 out 输出结果。
        /// </summary>
        public bool TryGet(string characterId, out CharacterData data)
        {
            if (_cache == null)
                BuildCache();

            return _cache.TryGetValue(characterId, out data);
        }

        /// <summary>
        /// 根据 characterId 获取角色数据，未找到时返回 null。
        /// </summary>
        public CharacterData Get(string characterId)
        {
            TryGet(characterId, out CharacterData data);
            return data;
        }

        private void BuildCache()
        {
            _cache = new Dictionary<string, CharacterData>(characters.Count);

            foreach (CharacterData character in characters)
            {
                if (character == null) continue;
                if (!string.IsNullOrEmpty(character.characterId))
                    _cache[character.characterId] = character;
            }
        }

        private void OnValidate()
        {
            // Inspector 中修改列表时清除缓存，确保 TryGet 结果始终一致
            _cache = null;
        }
    }
}