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using System.IO;
using System.Security.Cryptography.X509Certificates;
using Dough.IdentityServer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Dough.Models;
using Dough.Models.Database;
using Dough.Services;
using IdentityServer4.Configuration;
using Microsoft.AspNetCore.DataProtection;

namespace Dough
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        private const string DefaultCorsPolicy = "DefaultCorsPolicy";

        private string GetConnectionStringFromEnvironment()
        {
            var host = Configuration.GetValue<string>("DB_HOST");
            var port = Configuration.GetValue<string>("DB_PORT");
            var user = Configuration.GetValue<string>("DB_USER");
            var password = Configuration.GetValue<string>("DB_PASSWORD");
            var name = Configuration.GetValue<string>("DB_NAME");
            return $"Server={host},{port};Database={name};User={user};Password={password}";
        }

        private X509Certificate2 GetSigningCredentialFromPfx(string fileName)
        {
            var path = Path.Combine(Directory.GetCurrentDirectory(), "AppData", fileName);
            return new X509Certificate2(path, string.Empty);
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors(options =>
            {
                options.AddPolicy(DefaultCorsPolicy, builder =>
                {
                    builder
                        .WithOrigins(Constants.BrowserAppUrls)
                        .AllowAnyHeader()
                        .AllowAnyMethod();
                });
            });

            var dataprotectionkeyPath = Path.Combine(Directory.GetCurrentDirectory(), "AppData", "dpkeys");
            services.AddDataProtection().PersistKeysToFileSystem(new DirectoryInfo(dataprotectionkeyPath));

            services.AddHealthChecks()
                .AddDbContextCheck<MainDbContext>();

            services.AddDbContext<MainDbContext>(options =>
            {
                options.UseMySql(GetConnectionStringFromEnvironment());
            });

            services.AddIdentityServer(options =>
                {
                    options.UserInteraction = new UserInteractionOptions
                    {
                        LoginUrl = "/login",
                        ErrorUrl = "/error",
                    };
                })
                .AddInMemoryIdentityResources(Config.IdentityResources)
                .AddInMemoryApiScopes(Config.ApiScopes)
                .AddSigningCredential(GetSigningCredentialFromPfx("example.pfx"))
                .AddValidationKey(GetSigningCredentialFromPfx("example2.pfx"))
                .AddProfileService<ProfileService>()
                .AddInMemoryClients(Config.Clients);

            services.AddSingleton<EmailService>();

            services.AddControllers();
            services.AddRazorPages().AddRazorRuntimeCompilation();
        }

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

            app.UseRouting();
            app.UseStaticFiles();
            app.UseCors(DefaultCorsPolicy);
            app.UseHealthChecks("/health");
            app.UseStatusCodePages();
            app.UseIdentityServer();
            app.UseAuthorization();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapRazorPages();
                endpoints.MapControllers()
                    .RequireAuthorization();
            });
        }
    }
}