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

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace CorsServer.WebApi31
{
    public class StartupDefaultPolicy
    {
        public StartupDefaultPolicy(IConfiguration configuration, IHostEnvironment hostingEnvironment, IWebHostEnvironment webHostEnvironment)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            //config
            services.Configure<CorsOption>(Configuration.GetSection("CORS"));

            //Cors
            AddDefaultCors(services);

            services.AddControllers();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IOptionsSnapshot<CorsOption> corsOtionsSnapshot)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            //根路径：全局访问前辍 http://www.custom.com/PathBase/
            //app.UsePathBase("/api/");

            app.UseRouting();

            app.UseCors();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }

        /// <summary>
        /// 设置默认策略Cors
        /// </summary>
        private IServiceCollection AddDefaultCors(IServiceCollection services)
        {
            services.AddCors(setupCors =>
            {
                setupCors.AddDefaultPolicy(build =>
                {
                    build
                    .AllowAnyOrigin()
                    .AllowAnyMethod()
                    .AllowAnyHeader()
                    .SetPreflightMaxAge(TimeSpan.FromMinutes(10))
                    ;
                });
            });

            return services;
        }
    }
}