using Newtonsoft.Json;
using System;
using System.IO;

namespace ECCS
{
    public sealed class MultidimensionalTableConfig
    {
        private static readonly object _lock = new();
        private static MultidimensionalTableConfig? _instance;

        /// <summary>
        /// 单例实例（首次访问自动从文件加载）
        /// </summary>
        public static MultidimensionalTableConfig Instance
        {
            get
            {
                lock (_lock)
                {
                    if (_instance == null)
                    {
                        _instance = Load();
                    }
                    return _instance;
                }
            }
        }

        /// <summary>
        /// exe 目录下的 config.json
        /// </summary>
        [JsonIgnore]
        private static string ConfigFilePath =>
            Path.Combine(AppContext.BaseDirectory, "config.json");

        // ===== 配置项 =====
        public string AppToken { get; set; }
        public string DefaultTableId { get; set; }
        public bool DefaultTableIsDeleted { get; set; }

        /// <summary>
        /// 保存到 config.json
        /// </summary>
        public void Save()
        {
            var json = JsonConvert.SerializeObject(this, Formatting.Indented);
            File.WriteAllText(ConfigFilePath, json);
        }

        /// <summary>
        /// 从 config.json 加载
        /// </summary>
        private static MultidimensionalTableConfig Load()
        {
            if (!File.Exists(ConfigFilePath))
            {
                return new MultidimensionalTableConfig();
            }

            var json = File.ReadAllText(ConfigFilePath);
            return JsonConvert.DeserializeObject<MultidimensionalTableConfig>(json)
                   ?? new MultidimensionalTableConfig();
        }
    }
}