using Godot;
using System.Collections.Generic;
using System.Text.Json;

public partial class InventoryCategoryManager : Node
{
    public static InventoryCategoryManager Instance { get; private set; }

    public class InventoryCategory
    {
        public string CategoryName { get; set; }
        public List<string> Items { get; set; } = new List<string>();
    }

    public class InventoryCategoryData
    {
        public List<InventoryCategory> Categories { get; set; } = new List<InventoryCategory>();
    }

    private InventoryCategoryData categoryData;
    private Dictionary<string, InventoryCategory> categoryMap = new Dictionary<string, InventoryCategory>();

    public override void _Ready()
    {
        if (Instance == null)
        {
            Instance = this;
            LoadInventoryCategories();
        }
        else
        {
            QueueFree();
        }
    }

    private void LoadInventoryCategories()
    {
        string configPath = "res://data/config/inventory_categories.json";
        
        if (!FileAccess.FileExists(configPath))
        {
            GD.PrintErr($"库存分类配置文件不存在: {configPath}");
            return;
        }

        using var file = FileAccess.Open(configPath, FileAccess.ModeFlags.Read);
        if (file == null)
        {
            GD.PrintErr($"无法打开库存分类配置文件: {configPath}");
            return;
        }

        string jsonContent = file.GetAsText();
        
        try
        {
            var options = new JsonSerializerOptions
            {
                PropertyNameCaseInsensitive = true
            };
            
            categoryData = JsonSerializer.Deserialize<InventoryCategoryData>(jsonContent, options);
            
            if (categoryData?.Categories != null)
            {
                // 构建分类映射
                foreach (var category in categoryData.Categories)
                {
                    categoryMap[category.CategoryName] = category;
                    GD.Print($"加载库存分类: {category.CategoryName}, 包含 {category.Items.Count} 个物品");
                }
                
                GD.Print($"成功加载 {categoryData.Categories.Count} 个库存分类");
            }
        }
        catch (JsonException e)
        {
            GD.PrintErr($"解析库存分类配置文件失败: {e.Message}");
        }
    }

    public List<InventoryCategory> GetAllCategories()
    {
        return categoryData?.Categories ?? new List<InventoryCategory>();
    }

    public InventoryCategory GetCategory(string categoryName)
    {
        return categoryMap.GetValueOrDefault(categoryName);
    }

    public Dictionary<string, GameData.ItemData> GetItemsByCategory(string categoryName)
    {
        var result = new Dictionary<string, GameData.ItemData>();
        var category = GetCategory(categoryName);
        
        if (category == null || GameData.Instance == null)
        {
            return result;
        }

        foreach (var itemId in category.Items)
        {
            var itemData = GameData.Instance.GetItem(itemId);
            if (itemData != null)
            {
                result[itemId] = itemData;
            }
        }

        return result;
    }

    public override void _ExitTree()
    {
        if (Instance == this)
        {
            Instance = null;
        }
    }
}