using System.Diagnostics;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.TestHost;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

using Xunit;
using Xunit.DependencyInjection;
using Xunit.DependencyInjection.AspNetCoreTesting;
using Xunit.DependencyInjection.Logging;

namespace HttpClientStudy.UnitTest
{
    /// <summary>
    /// 依赖注入 框架必备设置类
    /// </summary>
    public class Startup
    {
        /// <summary>
        /// 创建主机：可选，一般不用
        /// </summary>
        /// <returns></returns>
        public IHostBuilder CreateHostBuilder()
        {
            return Host.CreateDefaultBuilder();
        }

        /// <summary>
        /// 配置主机：可选
        /// </summary>
        /// <param name="hostBuilder"></param>
        public void ConfigureHost(IHostBuilder hostBuilder)
        {
            //确保启动webapi项目
            StartWebApiProject();

            hostBuilder
                //主机配置
                .ConfigureHostConfiguration(builder =>
                {

                })
                //应用配置
                .ConfigureAppConfiguration((context, builder) =>
                {

                });

            hostBuilder.ConfigureWebHost(webHostBuilder =>
            {
                webHostBuilder
                    .UseTestServer(options => options.PreserveExecutionContext = true)
                    .ConfigureTestServices(a => { })
                    .UseStartup<WebApiStartup>();

                //配置默认配置项
                //webHostBuilder.ConfigureAppConfiguration((context, configBuilder) =>
                //{
                //    configBuilder.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
                //    configBuilder.AddJsonFile($"appsettings.{context.HostingEnvironment.EnvironmentName}.json", optional: true, reloadOnChange: true);
                //});

                //webHostBuilder.ConfigureServices(services => 
                //{
                //    services.AddHealthChecks(); 
                //});
            });
        }

        /// <summary>
        /// 注册服务：必须
        /// </summary>
        /// <param name="services"></param>
        public void ConfigureServices(IServiceCollection services, HostBuilderContext context)
        {
            Debugger.Log(1, "DI", "ConfigureServices");
        }

        private class WebApiStartup
        {
            public void ConfigureServices(IServiceCollection services) => services.AddLogging(lb => lb.AddXunitOutput());

            public void Configure(IApplicationBuilder app)
            {
                app.Run(static context => context.Response.WriteAsync("xxxxxx"));
            }
        }

        /// <summary>
        /// 启动webapi项目
        /// (出现webapi项目启动命令行窗口)
        /// </summary>
        public void StartWebApiProject()
        {
            string projectAndMutexName = WebApiConfigManager.GetWebApiConfigOption().CurrentValue.WebAppMutexName;

            //webapi项目不在运行状态则启动webapi项目
            if (webAppIsRunningByMutex() == false)
            {
                //VS项目根目录
                string vsProjectPath = new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory)!.Parent!.Parent!.Parent!.Parent!.FullName;

                //webapi项目根项目
                string webApiProjectPath = Path.Combine(vsProjectPath, projectAndMutexName);

                //启动命令信息
                var prossInfo = new ProcessStartInfo("dotnet", $"run --project {webApiProjectPath}")
                {
                    UseShellExecute = true,
                    CreateNoWindow = false,
                    RedirectStandardOutput = false
                };

                //启动
                Process.Start(prossInfo);
            }

            //由进程名判断
            //bool webAppIsRunningByProcessName()
            //{
            //    return Process.GetProcessesByName(projectAndMutexName).ToList().Count == 0;
            //}

            //由互斥锁判断
            bool webAppIsRunningByMutex()
            {
                //创建互斥锁
                _ = new Mutex(true, projectAndMutexName, out bool createdResult);
                
                //互斥锁是否创建成功
                return !createdResult;
            }

        }
    }
}