using UnityEngine;
using BaseGames.Equipment;

namespace BaseGames.World.Shop
{
    // ─── 商品效果基类及子类 ──────────────────────────────────────────────────
    // 使用 [SerializeReference] 多态序列化：Inspector 中右键可选择具体效果类型，
    // 只显示该类型所需字段，消除原平铺字段方案中大量空字段的噪音。

    [System.Serializable]
    public abstract class ShopItemEffect
    {
        public abstract ShopItemType Type { get; }
    }

    [System.Serializable]
    public class HealthRestorationEffect : ShopItemEffect
    {
        public override ShopItemType Type => ShopItemType.HealthRestoration;
        /// <summary>恢复的 HP 量。</summary>
        public int Amount;
    }

    [System.Serializable]
    public class CharmItemEffect : ShopItemEffect
    {
        public override ShopItemType Type => ShopItemType.CharmItem;
        /// <summary>购买后解锁/获得的护符。</summary>
        public CharmSO CharmReference;
    }

    [System.Serializable]
    public class KeyItemEffect : ShopItemEffect
    {
        public override ShopItemType Type => ShopItemType.KeyItem;
        /// <summary>授予玩家的关键道具 ID（对应 GameIds.Collectible）。</summary>
        public string KeyItemId;
    }

    [System.Serializable]
    public class ConsumableBuffEffect : ShopItemEffect
    {
        public override ShopItemType Type => ShopItemType.ConsumableBuff;
        // 可按需在此扩展 BuffId、Duration、Magnitude 等字段
    }

    [System.Serializable]
    public class MapFragmentEffect : ShopItemEffect
    {
        public override ShopItemType Type => ShopItemType.MapFragment;
        /// <summary>购买后揭示的房间 ID（对应 MapManager.SetMapped）。</summary>
        public string RoomId;
    }

    // ─── 商品 SO ──────────────────────────────────────────────────────────────

    /// <summary>
    /// 商店单品 SO（架构 15_MapShopModule §2.1）。
    /// 资产路径: Assets/ScriptableObjects/Shop/Item_{ItemId}.asset
    /// </summary>
    [CreateAssetMenu(menuName = "World/Shop/ShopItem")]
    public class ShopItemSO : ScriptableObject
    {
        [Header("标识")]
        public string ItemId;
        public string DisplayName;
        [TextArea(2, 5)]
        public string Description;
        public Sprite Icon;

        [Header("价格")]
        public int  BasePrice;
        public bool IsUnique;           // 购买一次后永久从库存移除
        public int  MaxPurchaseCount = -1;  // -1 = 无限次

        [Header("商品效果")]
        [SerializeReference]
        public ShopItemEffect Effect;

        /// <summary>
        /// 便捷属性：从 Effect 类型推导商品分类，供 ShopPanel/UI 按类型渲染图标或提示文字。
        /// Effect 为 null 时回退到 HealthRestoration（Inspector 未配置的保护值）。
        /// </summary>
        public ShopItemType ItemType => Effect?.Type ?? ShopItemType.HealthRestoration;
    }

    public enum ShopItemType
    {
        HealthRestoration,
        CharmItem,
        KeyItem,
        ConsumableBuff,
        MapFragment,
    }
}