using Infrastructure.Model;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using System;
using System.Security.Claims;

namespace Infrastructure
{
    public static class App
    {
        /// <summary>
        /// 全局配置文件
        /// </summary>
        public static OptionsSetting OptionsSetting => CatchOrDefault(() => ServiceProvider?.GetService<IOptions<OptionsSetting>>()?.Value);

        /// <summary>
        /// 服务提供器
        /// </summary>
        public static IServiceProvider ServiceProvider => InternalApp.ServiceProvider;
        /// <summary>
        /// 获取请求上下文
        /// </summary>
        public static HttpContext HttpContext => CatchOrDefault(() => ServiceProvider?.GetService<IHttpContextAccessor>()?.HttpContext);
        /// <summary>
        /// 获取请求上下文用户
        /// </summary>
        public static ClaimsPrincipal User => HttpContext?.User;
        /// <summary>
        /// 获取用户名
        /// </summary>
        public static string UserName => User?.Identity?.Name;
        /// <summary>
        /// 获取Web主机环境
        /// </summary>
        public static IWebHostEnvironment WebHostEnvironment => InternalApp.WebHostEnvironment; 
        /// <summary>
        /// 获取全局配置
        /// </summary>
        public static IConfiguration Configuration => CatchOrDefault(() => InternalApp.Configuration, new ConfigurationBuilder().Build());
        /// <summary>
        /// 获取请求生命周期的服务
        /// </summary>
        /// <typeparam name="TService"></typeparam>
        /// <returns></returns>
        public static TService GetService<TService>()
            where TService : class
        {
            return GetService(typeof(TService)) as TService;
        }

        /// <summary>
        /// 获取请求生命周期的服务
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public static object GetService(Type type)
        {
            return ServiceProvider.GetService(type);
        }

        /// <summary>
        /// 获取请求生命周期的服务
        /// </summary>
        /// <typeparam name="TService"></typeparam>
        /// <returns></returns>
        public static TService GetRequiredService<TService>()
            where TService : class
        {
            return GetRequiredService(typeof(TService)) as TService;
        }

        /// <summary>
        /// 获取请求生命周期的服务
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public static object GetRequiredService(Type type)
        {
            return ServiceProvider.GetRequiredService(type);
        }

        /// <summary>
        /// 处理获取对象异常问题
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="action">获取对象委托</param>
        /// <param name="defaultValue">默认值</param>
        /// <returns>T</returns>
        private static T CatchOrDefault<T>(Func<T> action, T defaultValue = null)
            where T : class
        {
            try
            {
                return action();
            }
            catch
            {
                return defaultValue ?? null;
            }
        }
    }
}