using FluentAssertions;

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Primitives;

namespace OptionStudy.UnitApp
{
    /// <summary>
    /// 5.1.7 配置内容同步
    /// </summary>
    public class SyncConfigTest : IDisposable
    {

        private readonly ITestOutputHelper? testOutput;
        public SyncConfigTest(ITestOutputHelperAccessor helperAccessor)
        {
            testOutput = helperAccessor.Output;
        }

        [Fact]
        public void Sync_Test()
        {
            var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,"Configs/appsettings.json");

            var config = new ConfigurationBuilder()
                .AddJsonFile(filePath, false, true)
                .Build();

            Action run = () =>                           // 执行事件
            {
                var configJsonText = System.Text.Json.JsonSerializer.Serialize(config.Get<AppOption>());
                testOutput?.WriteLine(configJsonText);
            };

            ChangeToken.OnChange
            (
                () => config.GetReloadToken(),  // IChangeToken
                run
             );

            File.AppendAllText(filePath," ");

            //等待一会，监控到文件变化后会执行回调方法
            Thread.Sleep(2*1000);

            //todo:断言方法至少执行一次
        }

        public void Dispose()
        {

        }
    }
}