using Autofac.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System.IO;

namespace New_College
{
    public class Program
    {
        /// <summary>
        /// 加载配置文件，构建IConfigurationRoot
        /// </summary>
        private static readonly IConfigurationBuilder ConfigurationBuilder = new ConfigurationBuilder();
        /// <summary>
        /// 获取配置文件中的内容，继承自IConfiguration
        /// </summary>
        private static IConfigurationRoot _configuration;

        public static void Main(string[] args)
        {
            _configuration = ConfigurationBuilder
                   .SetBasePath(Directory.GetCurrentDirectory())
                   .AddJsonFile(cfg =>
                   {
                       cfg.Path = "appsettings.json";
                       cfg.ReloadOnChange = true;
                       cfg.Optional = false;
                   })
                   //Build方法的调用要在AddJsonFile之后，否则生成的IConfigurationRoot实例的
                   //Providers属性不包含任何元素而导致无法读取文件中的信息
                   .Build();

            var url = _configuration.GetSection("urls");
            //初始化默认主机Builder
            Host.CreateDefaultBuilder(args)
             .UseServiceProviderFactory(new AutofacServiceProviderFactory())
             .ConfigureWebHostDefaults(webBuilder =>
             {
                 webBuilder
                 .UseStartup<Startup>()
                 .UseUrls(url.Value)
                 .ConfigureLogging((hostingContext, builder) =>
                 {
                     //过滤掉系统默认的一些日志
                     builder.AddFilter("System", LogLevel.Error);
                     builder.AddFilter("Microsoft", LogLevel.Error);
                     builder.AddFilter("New_College.AuthHelper.ApiResponseHandler", LogLevel.Error);

                     //可配置文件
                     var path = Path.Combine(Directory.GetCurrentDirectory(), "Log4net.config");
                     builder.AddLog4Net(path);
                 });
             })
            // 生成承载 web 应用程序的 Microsoft.AspNetCore.Hosting.IWebHost。Build是WebHostBuilder最终的目的，将返回一个构造的WebHost，最终生成宿主。
             .Build()
            // 运行 web 应用程序并阻止调用线程, 直到主机关闭。
            // ※※※※ 有异常，查看 Log 文件夹下的异常日志 ※※※※  
             .Run();
        }
    }
}