using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Appointment.Entity
{
    public class BaseConfig
    {
        /// <summary>
        /// 缓存配置文件
        /// </summary>
        static IConfiguration configuration { get; set; }

        static BaseConfig()
        {
            /* 当配置文件更新后，IConfiguration会自动更新，使用缓存为了双重保障 */
            DateTime now = DateTime.Now;
            if (validTime < now)
            {
                string path = "appsettings.json";
                var _newCreateTime = System.IO.File.GetCreationTime(path);
                if (_newCreateTime != createTime)
                {
                    configuration = new ConfigurationBuilder()
                        .Add(new JsonConfigurationSource
                        {
                            Path = path,
                            Optional = false,
                            ReloadOnChange = true
                        }).Build();
                    createTime = _newCreateTime;
                }
                validTime = now.AddSeconds(60);
            }
        }

        /// <summary>
        /// 缓存配置文件创建时间
        /// </summary>
        static DateTime createTime;

        /// <summary>
        /// 缓存配置文件失效时间
        /// </summary>
        static DateTime validTime;

        /// <summary>
        /// 获取配置信息(必项)
        /// </summary>
        /// <param name="sections"></param>
        /// <returns>当不存在或为空是输出异常</returns>
        public static string App(params string[] sections)
        {
            try
            {
                if (sections.Any())
                {
                    string str = configuration[string.Join(":", sections)];
                    if (!string.IsNullOrEmpty(str))
                    {
                        return str;
                    }
                }
                throw new Exception($"没有在配置文件中的appSettings中找到{sections.Last()}的配置，请检查配置文件配置！");
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 获取配置文件
        /// </summary>
        /// <param name="sections"></param>
        /// <param name="defaultValue">默认返回值</param>
        /// <returns>当不存在的配置项会返回null</returns>
        /// <remarks>
        /// 获取实例:
        /// BaseConfig.App(new string[] { "Logging" });
        /// BaseConfig.App(new string[] { "Logging", "LogLevel" });
        /// </remarks>
        public static string App(string[] sections, string defaultValue)
        {
            try
            {
                if (sections.Any())
                {
                    string stre = configuration[string.Join(":", sections)];

                    if (!string.IsNullOrEmpty(stre)) return stre;
                }
                return defaultValue;
            }
            catch (Exception)
            {
                return defaultValue;
            }
        }

        /// <summary>
        /// 递归获取配置信息数组
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sections"></param>
        /// <returns></returns>
        public static List<T> App<T>(params string[] sections)
        {
            List<T> list = new List<T>();
            configuration.Bind(string.Join(":", sections), list);
            return list;
        }
    }
}