using System;
using Cielonos.MainGame;
using Cielonos.MainGame.Inventory;
using Cielonos.MainGame.Narrative;
using UnityEngine;
using Yarn.Unity;

namespace Cielonos.Narrative
{
    public static partial class CustomFunctions
    {
        /// <summary>
        /// 提供给 Yarn Spinner 调用的自定义函数，用于在对话中给予玩家指定物品。
        /// 物品在授予后，会自动写入 InfoTransistor 中的 StartInventory，以便跨场景保存。
        /// </summary>
        /// <param name="itemClass">物品的类名（需存在于 Inventory.Collections 命名空间下）</param>
        /// <param name="stackAmount">物品的数量/层数，默认为 1</param>
        [YarnCommand("obtain_item")]
        public static void ObtainItem(string itemClass, int stackAmount = 1)
        {
            PlayerInventorySaveData startInventory = InfoTransistor.GetInfo<PlayerInventorySaveData>("StartInventory");
            if (startInventory == null)
            {
                // 如果当前不存在过渡存档数据，说明这是本次场景内的第一次额外物品获取。
                // 此时建立一个空的 SaveData 作为起始收集器。
                InfoTransistor.SetInfo("StartInventory", new PlayerInventorySaveData());
                startInventory = InfoTransistor.GetInfo<PlayerInventorySaveData>("StartInventory");
            }
            
            Type type = Type.GetType($"Cielonos.MainGame.Inventory.Collections.{itemClass}");
            if (type == null)
            {
                Debug.LogError($"[YarnCommand] Cannot find item class type for name '{itemClass}'. Make sure it is in namespace Cielonos.MainGame.Inventory.Collections");
                return;
            }
            
            ItemBase item = MainGameManager.Player.inventorySc.backpackSm.ObtainItem(type, stackAmount);
            ItemSaveData itemSaveData = new ItemSaveData(itemClass);
            if (item is MainWeaponBase mainWeapon)
            {
                MainGameManager.Player.inventorySc.equipmentSm.PrepareMainWeapon(mainWeapon);
                MainGameManager.Player.inventorySc.equipmentSm.EquipMainWeapon(mainWeapon);
                
                startInventory.mainWeapons.Add(itemSaveData);
                startInventory.preparedMainWeapons.Add(itemSaveData);
                startInventory.currentMainWeapon = itemSaveData;
            }
            else if (item is SupportEquipmentBase supportEquipment)
            {
                MainGameManager.Player.inventorySc.equipmentSm.EquipSupportEquipment(supportEquipment, 0);
                
                startInventory.supportEquipments.Add(itemSaveData);
                startInventory.currentSupportEquipments.Add(itemSaveData);
            }
            else if (item is PassiveEquipmentBase passiveEquipment)
            {
                MainGameManager.Player.inventorySc.backpackSm.ObtainItem(passiveEquipment);
                startInventory.passiveEquipments.Add(itemSaveData);
            }
            else if (item is ConsumableBase consumable)
            {
                itemSaveData.stackAmount = stackAmount;
                startInventory.consumables.Add(itemSaveData);
                Debug.Log($"[obtain_item] Obtained consumable '{itemClass}' with stack amount {stackAmount}.");
            }
        }

        [YarnFunction("check_have_item")]
        public static bool CheckHaveItem(string itemClass)
        {
            return MainGameManager.Player.inventorySc.backpackSm.HaveItem(itemClass);
        }

        /// <summary>
        /// 结束当前的地图事件（Event）。
        /// 调用后会通知 RunManager 将当前节点标记为已完成/已耗尽，并把系统状态恢复到 MapSelection 以便玩家继续前进。
        /// </summary>
        [YarnCommand("finish_event")]
        public static void FinishEvent()
        {
            if (RunManager.Instance != null && RunManager.Instance.currentPhase == RunPhase.InEvent)
            {
                RunManager.Instance.CompleteCurrentNode();
                Debug.Log("[CustomFunctions] finish_event: 当前地图事件已结束，系统状态已恢复到 MapSelection。");
            }
        }

        /// <summary>
        /// 耗尽/禁用指定的 NPC 交互（在剧情结束后彻底移除它的对话选项）。
        /// 适用于那些不能被反复对话的 NPC，或者需要等离开场景才重置交互逻辑的 NPC。
        /// </summary>
        /// <param name="npcID">NPC 的标识ID（例如 "SupportPersonnel"）</param>
        [YarnCommand("exhaust_npc")]
        public static void ExhaustNpc(string npcID)
        {
            if (StoryDirector.ActiveNpcs.TryGetValue(npcID, out var npc))
            {
                npc.SetExhausted();
                Debug.Log($"[CustomFunctions] NPC '{npcID}' 交互已耗尽。");
            }
            else
            {
                Debug.LogWarning($"[CustomFunctions] exhaust_npc 找不到处于激活状态的 NPC: '{npcID}'");
            }
        }
    }
}