using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.ResponseCompression;

using OpenIddict.Validation.AspNetCore;

using PrivaPub.ClientModels;
using PrivaPub.Extensions;
using PrivaPub.Models;
using PrivaPub.Services;
using PrivaPub.StaticServices;

using System.Text.Json.Serialization;
using Microsoft.OpenApi;
using PrivaPub.Services.ClientToServer.Private;
using PrivaPub.Services.ClientToServer.Public;
using PrivaPub.Federation.Actors;
using PrivaPub.Federation.Outbox;
using PrivaPub.Federation.Signing;
using PrivaPub.Federation.Inbox;
using PrivaPub.Federation.Objects;
using PrivaPub.Federation.Moderation;
using PrivaPub.Federation.Inbox.Handlers;
using PrivaPub.Domain.Content;
using PrivaPub.Domain.Relationships;
using PrivaPub.Domain.Social;
using PrivaPub.Domain.Statuses;
using PrivaPub.Domain.Timelines;
using PrivaPub.Infrastructure.Http;
using PrivaPub.Infrastructure.Jobs;
using Microsoft.Extensions.Options;

namespace PrivaPub.Middleware
{
	public static class PrivaPubConfigurations
	{
		const string SchemeSelector = "PrivaPub";

		public static IServiceCollection PrivaPubAppSettingsConfiguration(this IServiceCollection service, IConfiguration configuration)
		{
			return service
				.Configure<MongoSettings>(configuration.GetSection(nameof(MongoSettings)))
				.Configure<AppConfiguration>(configuration.GetSection(nameof(AppConfiguration)));
		}
		public static IServiceCollection PrivaPubWorkersConfiguration(this IServiceCollection service)
		{
			return service;
			//.AddHostedService<DiscussionsWorker>()
			//.AddHostedService<GroupsCleanerWorker>()
			//.AddHostedService<PoliciesCleanerWorker>();
		}
		public static IServiceCollection PrivaPubFederationConfiguration(this IServiceCollection service, IConfiguration configuration)
		{
			service.Configure<FederationOptions>(configuration.GetSection("Federation"));
			service.AddHttpClient(FederationHttp.ClientName, (provider, client) =>
				{
					var baseAddress = provider.GetRequiredService<IOptionsMonitor<AppConfiguration>>().CurrentValue.BackendBaseAddress?.TrimEnd('/');
					client.Timeout = FederationHttp.RequestTimeout;
					client.DefaultRequestHeaders.UserAgent.ParseAdd($"PrivaPub/{BuildInfo.Ref} (+{baseAddress}/)");
				})
				.ConfigurePrimaryHttpMessageHandler(provider =>
					SafeHttpHandlerFactory.Create(provider.GetRequiredService<IOptions<FederationOptions>>().Value));
			return service
				.AddSingleton<IFederationHttp, FederationHttp>()
				.AddSingleton<IDomainBlocks, DomainBlocks>()
				.AddSingleton<IContentRenderer, ContentRenderer>()
				.AddSingleton<ILocalActorService, LocalActorService>()
				.AddSingleton<IRemoteActorService, RemoteActorService>()
				.AddSingleton<IDeliveryService, DeliveryService>()
				.AddSingleton<IOutboxPublisher, OutboxPublisher>()
				.AddSingleton<IGroupDistributor, GroupDistributor>()
				.AddSingleton<ISignedFetchAuthorizer, SignedFetchAuthorizer>()
				.AddSingleton<IFanout, Fanout>()
				.AddSingleton<IInboxReceiver, InboxReceiver>()
				.AddSingleton<IActivityHandler, FollowHandler>()
				.AddSingleton<IActivityHandler, AcceptHandler>()
				.AddSingleton<IActivityHandler, RejectHandler>()
				.AddSingleton<IActivityHandler, UndoHandler>()
				.AddSingleton<IActivityHandler, LikeHandler>()
				.AddSingleton<IActivityHandler, DislikeHandler>()
				.AddSingleton<IActivityHandler, JoinHandler>()
				.AddSingleton<IActivityHandler, AnnounceHandler>()
				.AddSingleton<IActivityHandler, FlagHandler>()
				.AddSingleton<IActivityHandler, CreateHandler>()
				.AddSingleton<IActivityHandler, DeleteHandler>()
				.AddSingleton<IActivityHandler, UpdateHandler>()
				.AddSingleton<IJobHandler, InboxProcessor>()
				.AddSingleton<IRemotePosts, RemotePosts>()
				.AddSingleton<IObjectRecords, ObjectRecords>()
				.AddSingleton<IJobHandler, InstanceDescriber>()
				.AddSingleton<IJobHandler, AncestorsJobHandler>()
				.AddSingleton<IJobQueue, JobQueue>()
				.AddSingleton<IHostCircuitBreaker, HostCircuitBreaker>()
				.AddSingleton<IJobHandler, DeliveryJobHandler>()
				.AddHostedService<JobWorker>();
		}
		public static IServiceCollection PrivaPubAuthServicesConfiguration(this IServiceCollection service, IConfiguration configuration)
		{
			return service
				.AddAuthorization(options =>
				{
					options.AddPolicy(Policies.IsUser, Extensions.Extensions.IsUserPolicy());
					options.AddPolicy(Policies.IsAdmin, Extensions.Extensions.IsAdminPolicy());
					options.AddPolicy(Policies.IsModerator, Extensions.Extensions.IsModeratorPolicy());
				})
				.AddAuthentication(options =>
				{
					options.DefaultAuthenticateScheme = SchemeSelector;
					options.DefaultChallengeScheme = SchemeSelector;
					options.DefaultScheme = SchemeSelector;
				})
				.AddPolicyScheme(SchemeSelector, SchemeSelector, options => options.ForwardDefaultSelector = context =>
					context.Request.Path.StartsWithSegments("/api")
						? OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme
						: JwtBearerDefaults.AuthenticationScheme)
				.AddPrivaPubAuth(configuration)
				.Services
				.AddSingleton<AuthTokenManager>()
				.AddSingleton<IPasswordHasher, PasswordHasher>();
		}
		public static IServiceCollection PrivaPubInternalizationConfiguration(this IServiceCollection service, IConfiguration configuration)
		{
			return service
				.AddLocalization()
				.AddSingleton<RequestLocalizationOptionsService>();
		}

		public static IServiceCollection PrivaPubOptimizationConfiguration(this IServiceCollection service)
		{
			return service.AddResponseCompression(opts =>
			{
				opts.Providers.Add<BrotliCompressionProvider>();
				opts.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(new[] { "application/octet-stream" });
			});
		}

		public static IServiceCollection PrivaPubDataBaseConfiguration(this IServiceCollection service)
		{
			return service.AddSingleton<DbEntities>();
		}

		public static IServiceCollection PrivaPubServicesConfiguration(this IServiceCollection service)
		{
			return service
				.AddTransient<IDataService, DataService>()
				.AddTransient<IRootUsersService, RootUsersService>()
				.AddTransient<IPublicAvatarUsersService, PublicAvatarUsersService>()
				.AddTransient<IPrivateAvatarUsersService, PrivateAvatarUsersService>()
				.AddTransient<IGroupUsersService, GroupUsersService>()
				.AddTransient<IPostsService, PostsService>()
				.AddTransient<IStatusService, StatusService>()
				.AddTransient<IRelationshipService, RelationshipService>()
				.AddTransient<IReportService, ReportService>()
				.AddTransient<IFollowService, FollowService>()
				.AddTransient<ITimelineService, TimelineService>()
				.AddSingleton<AppConfigurationService>()
				.AddHttpContextAccessor()
				.AddMemoryCache()
				.AddSingleton<IPasswordHasher, PasswordHasher>();
		}

		public static IServiceCollection PrivaPubMiddlewareConfiguration(this IServiceCollection service)
		{
			return service
				.AddEndpointsApiExplorer()
				.AddSwaggerGen(c =>
				{
					c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
					{
						In = ParameterLocation.Header,
						Description = "Please enter a valid token",
						Name = "Authorization",
						Type = SecuritySchemeType.Http,
						BearerFormat = "JWT",
						Scheme = "bearer"
					});
					c.AddSecurityRequirement(document => new OpenApiSecurityRequirement
					{
						[new OpenApiSecuritySchemeReference("Bearer", document)] = []
					});
				})
				.AddRazorPages(options => options.RootDirectory = "/Web/Pages")
				.Services
				.AddControllers(options => { options.Filters.Add<OperationCancelledExceptionFilter>(); })
				.AddJsonOptions(options =>
				{
					options.JsonSerializerOptions.IgnoreReadOnlyFields = false;
					options.JsonSerializerOptions.IgnoreReadOnlyProperties = false;
					options.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
					options.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
					options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
				}).Services;
		}

		public static IServiceCollection PrivaPubCORSConfiguration(this IServiceCollection service)
		{
			return service.AddCors(options =>
			{
				options.DefaultPolicyName = "DefaultCORS";
				options.AddDefaultPolicy(configure =>
				{
					configure.AllowAnyMethod()
						.AllowAnyHeader()
						.AllowAnyOrigin()
						.WithExposedHeaders("Link", "X-RateLimit-Remaining", "X-RateLimit-Reset")
						.DisallowCredentials();
				});
			});
		}

	}
}