using IdentityServer4.AccessTokenValidation;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.OpenApi.Models;
using Ocelot.DependencyInjection;
using Ocelot.Middleware;
using QM.Gateway.Uses;
using System;
using System.Security.Cryptography;
using System.Threading.Tasks;

namespace QM.Gateway
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "QM.Gateway", Version = "v1" });
            });

            IdentityServerConfig identityServerConfig = new IdentityServerConfig();
            Configuration.Bind("IdentityServerConfig", identityServerConfig);

            var identityBuilder = services.AddAuthentication(identityServerConfig.IdentityScheme);
            if (identityServerConfig != null && identityServerConfig.ApiSecrets != null)
            {
                foreach (var resource in identityServerConfig.ApiSecrets)
                {
                    identityBuilder.AddIdentityServerAuthentication(resource.Key, options =>
                    {
                        options.Authority = identityServerConfig.Url;
                        options.RequireHttpsMetadata = identityServerConfig.UseHttps;
                        options.ApiName = resource.Name;
                        options.SupportedTokens = SupportedTokens.Both;
                        options.ApiSecret = resource.Name;
                    });
                }
            }
            // 注入Ocelot服务
            services.AddOcelot(Configuration);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "QM.Gateway v1"));
            }

            app.UseHttpsRedirection();

            //使用Ocelot中间件
            //app.UseOcelot().Wait();
            app.UseOcelot((builder, config) =>
            {
                //自定义中间件
                app.UseBuildOcelotPipeline(config);
            }).Wait();

            app.UseRouting();

            app.UseAuthorization();

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