using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.Extensions.Hosting;
using Microsoft.VisualStudio.TestPlatform.TestHost;

namespace SemanticKernelStudy.Test
{
    /// <summary>
    /// xUnit：依赖注入框架(Xunit.DependencyInjection)的启动类
    /// 1、执行顺序按照方法代码书写顺序执行(BuildHost有点特殊
    /// 2、两种风格任选其一即可：同时存在，则HostApplicationBuilder风格优先,Startup风格的方法会被忽略
    /// 3、两种风格都支持Configure方法：都会在最后执行
    /// </summary>
    public class StartupTemplate //代码中必须改为 Startup
    {
        #region HostApplicationBuilder 风格
        /// <summary>
        /// 必须：主配置方法
        /// 1、用本方法区分两种风格：本方法优先，如果存在本方法，则忽略Startup风格的方法
        /// </summary>
        /// <param name="hostApplicationBuilder"></param>
        public void ConfigureHostApplicationBuilder(IHostApplicationBuilder hostApplicationBuilder) 
        { 
            
        }

        /// <summary>
        /// 可选：生成IHost主机,只在异常时需要此方法
        /// 在程序因找不到此方法签名异常时，只需添加本方法，并调用 hostApplicationBuilder.Build() 即可构建主机。
        /// </summary>
        /// <param name="hostApplicationBuilder"></param>
        /// <returns></returns>
        public IHost BuildHostApplicationBuilder(HostApplicationBuilder hostApplicationBuilder)
        {
            return hostApplicationBuilder.Build();
        }
        #endregion

        #region Startup 风格
        /// <summary>
        /// 可选：创建HostBuilder
        /// 主要用于Minimal API场景，需导入Xunit.DependencyInjection.AspNetCoreTesting包
        /// </summary>
        /// <returns></returns>
        public IHostBuilder CreateHostBuilder(System.Reflection.AssemblyName assemblyName)
        {
            // minimal API testing, see details: https://github.com/pengweiqhca/Xunit.DependencyInjection#minimalapi
            // return MinimalApiHostBuilderFactory.GetHostBuilder<Program>();

            //通用方式：可以省略本方法
            return new HostBuilder().ConfigureServices(services => services.AddSingleton(this));
        }

        /// <summary>
        /// 可选：配置Host主机
        /// </summary>
        /// <param name="hostBuilder"></param>
        public void ConfigureHost(IHostBuilder hostBuilder)
        {

        }

        /// <summary>
        /// 可选：构建Host主机
        /// 如果找不到此方法签名,使用此方法即可构建主机
        /// 注意：没有异常时，不需要此方法
        /// </summary>
        /// <param name="hostBuilder"></param>
        /// <returns></returns>
        public IHost BuildHost(IHostBuilder hostBuilder)
        {
            //注意：执行Build 方法之前(此时还没有创建IHost对象)，先执行 ConfigureServices 方法

            IHost host = hostBuilder.Build();

            //注意：ConfigureServices方法执行后，回返回此处继续执行
            return host;
        }

        /// <summary>
        /// 配置IoC容器服务
        /// 注意：如果有BuildHost方法，则执行本方法后，回返回 BuildHost 方法继续执行
        /// </summary>
        /// <param name="services">必须</param>
        /// <param name="context">可选</param>
        /// <param name=""></param>
        public void ConfigureServices(IServiceCollection services, HostBuilderContext context)
        {

        }
        #endregion

        /// <summary>
        /// 可选：两种风格都支持的方法(最后执行)
        /// 参数：已经注册过的对象都可以,默认情况下，IServiceCollection 未注册
        /// </summary>
        /// <param name="applicationServices">可选的 IServiceProvider </param>
        public void Configure
        (
            IHostEnvironment env,
            //IHostingEnvironment hostingEnv,
            HostBuilderContext hostBuilderContext,
            IConfiguration Con,
            //IApplicationLifetime appLifetime,
            IHostApplicationLifetime hostAppLifetime,
            IHostLifetime hostLifetime,
            IHost host,
            IOptions<RedisConfig> options,
            IConfigureOptions<HostOptions> hostOptions,

            ITestOutputHelperAccessor helperAccessor,
            ILoggerFactory loggerFactory,
            //ILogger<Startup> logger,

            //IHostApplicationBuilder appBuilder,
            //IServiceCollection services,
            IXunitTestCaseRunnerWrapper  wraper,

            IServiceProvider applicationServices

        )
        {
            var s =  applicationServices.GetService<HostBuilderContext>();
        }
    }
}