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

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.EnvironmentVariables;
using Microsoft.Extensions.Configuration.CommandLine;
using Microsoft.Extensions.Configuration.Memory;
using Microsoft.Extensions.Configuration.Xml;
using Microsoft.Extensions.Configuration.Ini;
using Microsoft.Extensions.Configuration.Binder;
using Microsoft.Extensions.Configuration.KeyPerFile;
using Microsoft.Extensions.Configuration.Json;
using Microsoft.Extensions.Configuration.UserSecrets;

using Microsoft.Extensions.Options; 

using NetEscapades.Configuration.Yaml;
using Microsoft.Extensions.DependencyInjection;
using System.Reflection;

namespace HttpClientStudy.Config
{
    public static class WebApiConfigExtensions
    {
        /// <summary>
        /// 添加WebApi配置文件
        /// </summary>
        public static IConfigurationBuilder AddWebApiConfiguration(this IConfigurationBuilder configuration)
        {
            /*
            //应用程序信息
  
            //程序的上下文基准目录:通常是应用程序启动时的目录，也可以理解为包含可执行文件的目录
            Console.WriteLine($"应用程序的基准目录[AppContext.BaseDirectory] = {AppContext.BaseDirectory}");

            //程序安装或启动基目录
            Console.WriteLine($"程序安装或启动基目录[AppDomain.CurrentDomain.SetupInformation.ApplicationBase]：{AppDomain.CurrentDomain.SetupInformation.ApplicationBase}");

            //进程主模块的完整路径
            Console.WriteLine($"进程主模块的完整路径[Process.GetCurrentProcess().MainModule.FileName]:{Process.GetCurrentProcess()?.MainModule?.FileName}");

            //环境变量：当前工作目录
            Console.WriteLine($"当前工作目录[Environment.CurrentDirectory]:{Environment.CurrentDirectory}");
            
            //文件当前目录：当前工作目录：不一定是启动目录
            Console.WriteLine($"文件当前目录[Directory.GetCurrentDirectory()]：{Directory.GetCurrentDirectory()}");

            //可执行程序集目录
            Console.WriteLine($"可执行程序集目录[Assembly.GetExecutingAssembly().Location]:{Assembly.GetExecutingAssembly().Location}");

            //指定程序集目录：可以是引用类库、指定类所在类库目录 
            Console.WriteLine($"指定程序集目录[Type.Assembly.Location]：{typeof(WebApiConfigExtensions).Assembly.Location}");
            */

            //配置文件根目录：配置项目Dll文件所在目录(被其它项目引用时，引用后dll的文件所在目录)
            string configDellPath = Path.GetDirectoryName(typeof(WebApiConfig).Assembly.Location) ?? Directory.GetCurrentDirectory();
            configuration.SetBasePath(configDellPath);
            Console.WriteLine($"配置文件根目录：{configDellPath}");

            configuration.AddJsonFile($"ConfigFiles/Config.json", optional: false, reloadOnChange: true);
            configuration.AddJsonFile($"ConfigFiles/Config.{System.Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json", optional: true, reloadOnChange: true);

            return configuration;
        }

        /// <summary>
        /// 使用选项模式 
        /// </summary>
        /// <param name="serviceProvider"></param>
        /// <returns></returns>
        public static IServiceCollection AddWebApiOptions(this IServiceCollection services)
        {
            services.AddOptions();

            var configuration = services.BuildServiceProvider().GetService<IConfiguration>();
            if (configuration == null)
            {
                throw new InvalidOperationException("Configuration is not configured.");
            }

            services.Configure<WebApiConfig>(configuration.GetSection("WebApi"));

            return services;
        }
    }
}