using System;
    using System.Collections.Generic;
    using System.Text;
    using UnityEngine;

    namespace BeiBao
{
/// <summary>
/// 背包类
/// 背包是由多个格子组成的，每个格子都可以存放不同的物品。
/// </summary>
    public class Inventory
    {
        public int SlotCount { get; set; } // 背包格子的数量
        private List<InventorySlot> slots;

        public Inventory(int slotCount)
        {
            SlotCount = slotCount;
            slots = new List<InventorySlot>();
            for (int i = 0; i < SlotCount; i++)
            {
                slots.Add(new InventorySlot());
            }
        }

        // 向背包中添加物品
        public bool AddItem(Item item, int quantity)
        {
            int remainingQuantity = quantity;
        
            foreach (var slot in slots)
            {
                if (remainingQuantity == 0) break;

                if (slot.IsEmpty)
                {
                    // 如果格子为空，直接放入物品
                    remainingQuantity = item.AddQuantity(remainingQuantity);
                    slot.AddItem(item, quantity - remainingQuantity);
                }
                else if (slot.Item.ItemID == item.ItemID && slot.Item.Quantity < slot.Item.MaxStack)
                {
                    // 如果格子内物品与新物品相同，并且未满堆叠，堆叠物品
                    remainingQuantity = slot.Item.AddQuantity(remainingQuantity);
                }
            }

            return remainingQuantity == 0;
        }

        // 从背包中取出物品
        public bool RemoveItem(int itemID, int quantity)
        {
            int remainingQuantity = quantity;

            foreach (var slot in slots)
            {
                if (remainingQuantity == 0) break;

                if (!slot.IsEmpty && slot.Item.ItemID == itemID)
                {
                    remainingQuantity -= slot.Item.RemoveQuantity(remainingQuantity) ? remainingQuantity : 0;
                }
            }

            return remainingQuantity == 0;
        }

        // 查看背包内容
        public void ShowInventory()
        {
            StringBuilder sb = new StringBuilder();
            foreach (var slot in slots)
            {
                if (!slot.IsEmpty)
                {
                    sb.AppendLine($"{slot.Item.ItemName} - {slot.Item.Quantity}/{slot.Item.MaxStack}");
                }
            }
            Debug.Log(sb.ToString());
        }
    }

}