using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Oqtane.Extensions;
using Oqtane.Infrastructure;
using Oqtane.Models;
using Oqtane.Repository;
using Oqtane.Security;
using Oqtane.Shared;
using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.Extensions.Logging;
using Oqtane.Components;
using Oqtane.UI;
using OqtaneSSR.Extensions;
using Microsoft.AspNetCore.Components.Authorization;
using Oqtane.Providers;
using Microsoft.AspNetCore.Cors.Infrastructure;
using Microsoft.Net.Http.Headers;

namespace Oqtane
{
    public class Startup
    {
        private readonly bool _useSwagger;
        private readonly IWebHostEnvironment _env;
        private readonly string[] _installedCultures;
        private string _configureServicesErrors;

        public IConfigurationRoot Configuration { get; }

        public Startup(IWebHostEnvironment env, ILocalizationManager localizationManager)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", false, true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", true, true)
                .AddEnvironmentVariables();

            Configuration = builder.Build();

            _installedCultures = localizationManager.GetInstalledCultures();

            //add possibility to switch off swagger on production.
            _useSwagger = Configuration.GetSection("UseSwagger").Value != "false";

            AppDomain.CurrentDomain.SetData(Constants.DataDirectory, Path.Combine(env.ContentRootPath, "Data"));

            _env = env;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            // process forwarded headers on load balancers and proxy servers
            services.Configure<ForwardedHeadersOptions>(options =>
            {
                options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
            });

            // register localization services
            services.AddLocalization(options => options.ResourcesPath = "Resources");

            services.AddOptions<List<Database>>().Bind(Configuration.GetSection(SettingKeys.AvailableDatabasesSection));
            services.Configure<HostOptions>(opts => opts.ShutdownTimeout = TimeSpan.FromSeconds(10)); // increase from default of 5 seconds

            // register scoped core services
            services.AddScoped<IAuthorizationHandler, PermissionHandler>()
                .AddOqtaneServerScopedServices();

            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

            // setup HttpClient for server side in a client side compatible fashion ( with auth cookie )
            services.AddHttpClients();

            // register singleton scoped core services
            services.AddSingleton(Configuration)
                .AddOqtaneSingletonServices();

            // install any modules or themes ( this needs to occur BEFORE the assemblies are loaded into the app domain )
            _configureServicesErrors += InstallationManager.InstallPackages(_env.WebRootPath, _env.ContentRootPath);

            // register transient scoped core services
            services.AddOqtaneTransientServices();

            // load the external assemblies into the app domain, install services
            services.AddOqtane(_installedCultures);
            services.AddOqtaneDbContext();

            services.AddAntiforgery(options =>
            {
                options.HeaderName = Constants.AntiForgeryTokenHeaderName;
                options.Cookie.Name = Constants.AntiForgeryTokenCookieName;
                options.Cookie.SameSite = Microsoft.AspNetCore.Http.SameSiteMode.Strict;
                options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest;
                options.Cookie.HttpOnly = true;
            });

            services.AddIdentityCore<IdentityUser>(options => { })
                .AddEntityFrameworkStores<TenantDBContext>()
                .AddSignInManager()
                .AddDefaultTokenProviders()
                .AddClaimsPrincipalFactory<ClaimsPrincipalFactory<IdentityUser>>(); // role claims

            services.ConfigureOqtaneIdentityOptions(Configuration);

            services.AddCascadingAuthenticationState();
            services.AddScoped<AuthenticationStateProvider, IdentityRevalidatingAuthenticationStateProvider>();
            services.AddAuthorization();

            services.AddAuthentication(options =>
            {
                options.DefaultScheme = Constants.AuthenticationScheme;
            })
            .AddCookie(Constants.AuthenticationScheme)
            .AddOpenIdConnect(AuthenticationProviderTypes.OpenIDConnect, options => { })
            .AddOAuth(AuthenticationProviderTypes.OAuth2, options => { });

            services.ConfigureOqtaneCookieOptions();
            services.ConfigureOqtaneAuthenticationOptions(Configuration);

            services.AddOqtaneSiteOptions()
                .WithSiteIdentity()
                .WithSiteAuthentication();

            services.AddCors(options =>
            {
                options.AddPolicy(Constants.MauiCorsPolicy,
                    policy =>
                    {
                        // allow .NET MAUI client cross origin calls
                        policy.WithOrigins("https://0.0.0.0", "http://0.0.0.0", "app://0.0.0.0")
                            .AllowAnyHeader().AllowAnyMethod().AllowCredentials();
                    });
            });

            services.AddMvc(options =>
            {
                options.Filters.Add(new AutoValidateAntiforgeryTokenAttribute());
            })
            .AddOqtaneApplicationParts() // register any Controllers from custom modules
            .ConfigureOqtaneMvc(); // any additional configuration from IStartup classes

            services.AddRazorPages();

            services.AddRazorComponents()
               .AddInteractiveServerComponents(options =>
               {
                   if (_env.IsDevelopment())
                   {
                       options.DetailedErrors = true;
                   }
               }).AddHubOptions(options =>
               {
                   options.MaximumReceiveMessageSize = null; // no limit (for large amounts of data ie. textarea components)
               })
               .AddInteractiveWebAssemblyComponents();

            services.AddSwaggerGen(options =>
            {
                options.CustomSchemaIds(type => type.ToString()); // Handle SchemaId already used for different type
            });
            services.TryAddSwagger(_useSwagger);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ISyncManager sync, ICorsService corsService, ICorsPolicyProvider corsPolicyProvider, IConfigManager configManager, ILogger<Startup> logger)
        {
            if (!string.IsNullOrEmpty(_configureServicesErrors))
            {
                logger.LogError(_configureServicesErrors);
            }

            ServiceActivator.Configure(app.ApplicationServices);

            if (env.IsDevelopment())
            {
                app.UseWebAssemblyDebugging();
                app.UseForwardedHeaders();
            }
            else
            {
                app.UseForwardedHeaders();
                app.UseExceptionHandler("/Error", createScopeForErrors: true);
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            // execute any IServerStartup logic
            app.ConfigureOqtaneAssemblies(env);

            // allow oqtane localization middleware
            app.UseOqtaneLocalization();

            app.UseHttpsRedirection();
            app.UseStaticFiles(new StaticFileOptions
            {
                ServeUnknownFileTypes = true,
                OnPrepareResponse = (ctx) =>
                {
                    if (!env.IsDevelopment())
                    {
                        var cachecontrol = configManager.GetSetting("CacheControl", "public, max-age=604800");
                        if (!string.IsNullOrEmpty(cachecontrol))
                        {
                            ctx.Context.Response.Headers.Append(HeaderNames.CacheControl, cachecontrol);
                        }
                    }
                    var policy = corsPolicyProvider.GetPolicyAsync(ctx.Context, Constants.MauiCorsPolicy)
                        .ConfigureAwait(false).GetAwaiter().GetResult();
                    corsService.ApplyResult(corsService.EvaluatePolicy(ctx.Context, policy), ctx.Context.Response);
                }
            });
            app.UseExceptionMiddleWare();
            app.UseTenantResolution();
            app.UseJwtAuthorization();
            app.UseRouting();
            app.UseCors();
            app.UseAuthentication();
            app.UseAuthorization();
            app.UseAntiforgery();

            if (_useSwagger)
            {
                app.UseSwagger();
                app.UseSwaggerUI(c => { c.SwaggerEndpoint("/swagger/" + Constants.Version + "/swagger.json", Constants.PackageId + " " + Constants.Version); });
            }

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

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapRazorComponents<App>()
                    .AddInteractiveServerRenderMode()
                    .AddInteractiveWebAssemblyRenderMode()
                    .AddAdditionalAssemblies(typeof(SiteRouter).Assembly);
            });

            // simulate the fallback routing approach of traditional Blazor - allowing the custom SiteRouter to handle all routing concerns
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapFallback();
            });

            // create a global sync event to identify server application startup
            sync.AddSyncEvent(-1, -1, EntityNames.Host, -1, SyncEventActions.Reload);
        }
    }
}