using System.IO;
using System.Reflection;
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 IdentityServer4.EntityFramework.DbContexts;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Diagnostics.HealthChecks;

namespace Dough
{
    public class Startup
    {
        private IConfiguration _configuration { get; }
        private IWebHostEnvironment _environment { get; }

        private const string DefaultCorsPolicy = "DefaultCorsPolicy";

        public Startup(IConfiguration configuration, IWebHostEnvironment environment)
        {
            _configuration = configuration;
            _environment = environment;
        }

        private string GetConnectionStringFromEnvironment(string database)
        {
            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");
            return $"Server={host},{port};Database={database};User={user};Password={password}";
        }

        private static X509Certificate2 GetSigningCredentialFromPfx(string fileName)
        {
            var path = Path.Combine(Directory.GetCurrentDirectory(), "AppData", "certs", 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("dough"),
                    builder => { builder.EnableRetryOnFailure(); }
                );
                if (_environment.IsDevelopment())
                {
                    options.EnableSensitiveDataLogging();
                }
            });

            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;

            services.AddAuthentication().AddLocalApi();

            services.AddIdentityServer(options =>
                {
                    options.UserInteraction = new UserInteractionOptions
                    {
                        LoginUrl = "/login",
                        ErrorUrl = "/error",
                    };
                })
                .AddOperationalStore<PersistedGrantDbContext>(options =>
                {
                    options.ConfigureDbContext = builder =>
                    {
                        builder.UseMySql(GetConnectionStringFromEnvironment("dough_tokens"),
                            sql =>
                            {
                                sql.MigrationsAssembly(migrationsAssembly);
                                sql.EnableRetryOnFailure();
                            });
                        if (_environment.IsDevelopment())
                        {
                            builder.EnableSensitiveDataLogging();
                        }
                    };
                })
                .AddInMemoryIdentityResources(Config.IdentityResources)
                .AddInMemoryApiScopes(Config.ApiScopes)
                .AddInMemoryClients(Config.Clients)
                .AddSigningCredential(GetSigningCredentialFromPfx("example.pfx"))
                .AddProfileService<ProfileService>();
            
            services.AddSingleton<EmailService>();

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

        public void Configure(IApplicationBuilder app)
        {
            if (_environment.IsDevelopment())
                app.UseDeveloperExceptionPage();

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