using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Reflection;
using IdentityModel.AspNetCore.OAuth2Introspection;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using xApi.Extensions;
using xCommons.Configurations;
using xCommons.Extensions;
using xDataService.Models;
using xHttpService.DI;
using xIdentityService.DI;
using xServices.Databases;
using xServices.DI;

namespace xApi
{
    public class Startup
    {
        //
        public IConfiguration Configuration { get; }
        private readonly XApiDatabaseDescriptor apiDatabaseDescriptor;

        public Startup(IConfiguration configuration)
        {
            //
            Configuration = configuration;

            //
            // Create an Api Descriptor Class Instance ...
            apiDatabaseDescriptor = new XApiDatabaseDescriptor();
        }

        public void ConfigureServices(IServiceCollection services)
        {
            //
            // Register Validation Provider and all XCommons Module Services ...
            services.AddXCommons();

            //
            // Register App Configuration ...
            services.AddXAppConfiguration(Configuration);
            var appConfiguration = services.GetRegisteredService<XAppConfiguration>();

            //
            // Register Allowed Origins ...
            services.AddXCors(appConfiguration.AllowedOrigins);

            //
            // Register Swagger ...
            var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
            var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
            services.AddXSwagger(Configuration, xmlFilePath: xmlPath);

            //
            // Register HttpService ...
            services.AddXHttpService(Configuration);

            //
            // Add Api V1 Versioning ...
            services.AddXApiV1Versioning();

            //
            // OAuthIntrospectin Http Client Handler ...
            // this is for handling SSLErrors ...
            services.AddHttpClient(OAuth2IntrospectionDefaults.BackChannelHttpClientName)
                .ConfigurePrimaryHttpMessageHandler(() =>
                {
                    return new HttpClientHandler
                    {
                        ServerCertificateCustomValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true
                    };
                });

            //
            // Register Authorizations ...
            services.AddXAuthorization();

            //
            services.AddControllers()
                .AddNewtonsoftJson(x =>
                {
                    x.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
                    x.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                });

            //
            // Custom ...

            //
            services.Configure<IISServerOptions>(options =>
            {
                options.AllowSynchronousIO = true;
            });

            //
            services.Configure<KestrelServerOptions>(options =>
            {
                options.AllowSynchronousIO = true;
            });

            //
            // Register Services ...
            services.AddXServices(
                configuration: Configuration,
                databases: new List<XDatabaseDescriptor>
                {
                    apiDatabaseDescriptor
                },
                lifeTime: ServiceLifetime.Scoped
            );
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            //
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            //
            // Use Swagger Middleware ...
            app.UseXSwagger();

            //
            app.UseHttpsRedirection();

            //
            // Using Cors ...
            app.UseXCors();

            //
            app.UseRouting();

            //
            // Use xIdentityService ...
            app.UseXIdentityService();

            //
            app.UseAuthorization();

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

            //
            // Use xDataService Middleware ...
            app.UseXServices(
                databases: new List<XDatabaseDescriptor>
                {
                    apiDatabaseDescriptor
                },
                isDevelopmentEnvironment: env.IsDevelopment()
            );
        }
    }
}