using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Identity.API.Data;
using Identity.API.Models;
using Identity.API.Services;
using Identity.API.Configuration;
using IdentityServer4.Services;
using System.Threading;
using Microsoft.eShopOnContainers.Services.Catalog.API.Infrastructure;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.HealthChecks;
using Identity.API.Certificate;
using DataProtectionExtensions;
using System.Reflection;
using IdentityServer4.Test;
using IdentityServer4.EntityFramework.DbContexts;
using IdentityServer4.EntityFramework.Mappers;

namespace eShopOnContainers.Identity
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

            if (env.IsDevelopment())
            {
                // For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
                //builder.AddUserSecrets();
            }

            builder.AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddDbContext<ApplicationDbContext>(options =>
             options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();

            services.Configure<AppSettings>(Configuration);

            services.AddMvc();

            services.AddDataProtection(opts =>
            {
                opts.ApplicationDiscriminator = "eshop.identity";
            });//.PersistKeysToRedis("basket.data");

            services.AddHealthChecks(checks =>
            {
                var minutes = 1;
                if (int.TryParse(Configuration["HealthCheck:Timeout"], out var minutesParsed))
                {
                    minutes = minutesParsed;
                }
                checks.AddSqlCheck("Identity_Db", Configuration.GetConnectionString("DefaultConnection"), TimeSpan.FromMinutes(minutes));
            });

            services.AddTransient<IEmailSender, AuthMessageSender>();
            services.AddTransient<ISmsSender, AuthMessageSender>();
            services.AddTransient<ILoginService<ApplicationUser>, EFLoginService>();
            services.AddTransient<IRedirectService, RedirectService>();

            var connectionString = Configuration.GetConnectionString("DefaultConnection");
            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;

            // Adds IdentityServer
            services.AddIdentityServer(x => x.IssuerUri = "null")
                .AddSigningCredential(Certificate.Get())               
                .AddAspNetIdentity<ApplicationUser>()
                .AddConfigurationStore(builder =>
                    builder.UseSqlServer(connectionString, options =>
                        options.MigrationsAssembly(migrationsAssembly)))
                .AddOperationalStore(builder =>
                    builder.UseSqlServer(connectionString, options =>
                        options.MigrationsAssembly(migrationsAssembly)))
                .Services.AddTransient<IProfileService, ProfileService>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();


            // Make work identity server redirections in Edge and lastest versions of browers. WARN: Not valid in a production environment.
            app.Use(async (context, next) =>
            {
                context.Response.Headers.Add("Content-Security-Policy", "script-src 'unsafe-inline'");
                await next();
            });

            app.UseIdentity();

            // Adds IdentityServer
            app.UseIdentityServer();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });

            InitializeDatabase(app);

            //Seed Data
            var hasher = new PasswordHasher<ApplicationUser>();
            new ApplicationContextSeed(hasher).SeedAsync(app, loggerFactory)
            .Wait();
        }

        private void InitializeDatabase(IApplicationBuilder app)
        {
            //callbacks urls from config:
            Dictionary<string, string> clientUrls = new Dictionary<string, string>();
            clientUrls.Add("Mvc", Configuration.GetValue<string>("MvcClient"));
            clientUrls.Add("Spa", Configuration.GetValue<string>("SpaClient"));
            clientUrls.Add("Xamarin", Configuration.GetValue<string>("XamarinCallback"));

            using (var serviceScope = app.ApplicationServices.GetService<IServiceScopeFactory>().CreateScope())
            {
                serviceScope.ServiceProvider.GetRequiredService<PersistedGrantDbContext>().Database.Migrate();
                var context = serviceScope.ServiceProvider.GetRequiredService<ConfigurationDbContext>();
                context.Database.Migrate();

                if (!context.Clients.Any())
                {
                    foreach (var client in Config.GetClients(clientUrls))
                    {
                        context.Clients.Add(client.ToEntity());
                    }
                    context.SaveChanges();
                }

                if (!context.IdentityResources.Any())
                {
                    foreach (var resource in Config.GetResources())
                    {
                        context.IdentityResources.Add(resource.ToEntity());
                    }
                    context.SaveChanges();
                }

                if (!context.ApiResources.Any())
                {
                    foreach (var api in Config.GetApis())
                    {
                        context.ApiResources.Add(api.ToEntity());
                    }
                    context.SaveChanges();
                }
            }
        }
    }
}