using System.Text.Json;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Memory;
using Microsoft.Extensions.Configuration.Json;
using Microsoft.Extensions.Options;

namespace OptionsPattern.Sutdy.Experience.ConsoleApp
{
    /// <summary>
    /// 6.1.3 配置源的同步
    /// 单独一个线程，随机时间改变配置文件内容
    /// 主线程接收的更改通知，把新配置打印到控制台窗口
    /// </summary>
    internal class Program
    {
        private static string jsonConfigFile = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory,"appsettings.json");

        static void Main(string[] args)
        {
            Console.WriteLine("============ 配置选项编程体验：6.1.3 配置源的同步 ============");

            //获取配置项
            var configuration=new ConfigurationBuilder().AddJsonFile(jsonConfigFile,false,true).Build();
            new ServiceCollection()
                .AddOptions()
                .Configure<AppOption>(configuration)
                .BuildServiceProvider()
                .GetRequiredService<IOptionsMonitor<AppOption>>()
                .OnChange(app => 
                {
                    var jsonText = JsonSerializer.Serialize(app);
                    Console.WriteLine($"{DateTime.Now.ToString("yyyy:MM:dd HH:mm:ss FFFFFF")} 接到变更通知，新项为：");
                    Console.WriteLine(jsonText);

                });


            //随机改变配置文件内容
            new Thread((jsonFile) => 
            {
                while (true)
                {
                    ChangeJsonFileContent(jsonConfigFile, 5, 10);
                }
            })
           .Start(jsonConfigFile);

            Console.ReadLine();
        }

        /// <summary>
        /// 随机秒数，随机改变Json配置文件配置项的值
        /// </summary>
        static void ChangeJsonFileContent(string jsonFileFullPath,int min=5,int max = 20)
        {
            if (string.IsNullOrWhiteSpace(jsonFileFullPath))
            {
                throw new ArgumentException($"参数{nameof(jsonFileFullPath)}不能为空！");
            }

            if (!File.Exists(jsonFileFullPath))
            {
                throw new FileNotFoundException($"参数{nameof(jsonFileFullPath)}指定的json配置文件不存在！");
            }

            //随机时间(秒数)
            Random random = new Random();
            var secondNum = random.Next(min, max);
            Thread.Sleep(1000 * secondNum);

            //读取Json配置文件内容
            var appOption = new ConfigurationBuilder()
                .AddJsonFile(jsonFileFullPath, false, false)
                .Build()
                .Get<AppOption>();
            //改变配置项
            appOption.AppName = Guid.NewGuid().ToString()+"_AppName";
            appOption.AppVersion = new Version(DateTime.Now.Hour, DateTime.Now.Minute, DateTime.Now.Second);
            appOption.EMail = new ReceiveMailOption()
            {
                ReceiveAddress = appOption.AppName + "@163.com",
                Recipient = secondNum + "_Recipient",
            };

            //写回文件
            var jsonText = JsonSerializer.Serialize(appOption);

            File.WriteAllText(jsonFileFullPath,jsonText);

            Console.WriteLine($"{DateTime.Now.ToString("yyyy:MM:dd HH:mm:ss FFFFFF")} 改变配置文件内容：");
            Console.WriteLine(jsonText);
        }
    }
}