package it.cavallium;

import static it.cavallium.PrimaryController.getUserbotPhoneNumber;

import com.google.i18n.phonenumbers.NumberParseException;
import com.google.i18n.phonenumbers.PhoneNumberUtil;
import com.google.i18n.phonenumbers.PhoneNumberUtil.PhoneNumberFormat;
import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
import it.tdlight.jni.TdApi;
import it.tdlight.jni.TdApi.AuthorizationStateClosed;
import it.tdlight.jni.TdApi.AuthorizationStateClosing;
import it.tdlight.jni.TdApi.AuthorizationStateLoggingOut;
import it.tdlight.jni.TdApi.AuthorizationStateReady;
import it.tdlight.jni.TdApi.Update;
import it.tdlight.jni.TdApi.UpdateSupergroup;
import it.tdlight.tdlibsession.td.easy.AsyncTdEasy;
import it.tdlight.tdlibsession.td.easy.ParameterInfoPasswordHint;
import it.tdlight.tdlibsession.td.easy.TdEasySettings;
import it.tdlight.tdlibsession.td.middle.TdClusterManager;
import it.tdlight.tdlibsession.td.middle.direct.AsyncTdMiddleDirect;
import it.tdlight.utils.MonoUtils;
import java.io.File;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import org.apache.logging.log4j.LogManager;
import org.reactivestreams.Publisher;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.EmitterProcessor;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Schedulers;

public class TransferServiceImpl implements TransferService {

	private final TdClusterManager clusterManager;
	private final ConcurrentHashMap<Long, TransferClient> clients = new ConcurrentHashMap<>();
	private int apiId;
	private String apiHash;

	public TransferServiceImpl(TdClusterManager clusterManager) {
		this.clusterManager = clusterManager;
	}

	@Override
	public void setApiId(int apiId) {
		this.apiId = apiId;
	}

	@Override
	public void setApiHash(String apiHash) {
		this.apiHash = apiHash;
	}

	@Override
	public Mono<AddUserBotResult> addUserbot(PhoneNumber phoneNumber,
			Function<AsyncTdEasy, Mono<Integer>> codeSupplier,
			BiFunction<AsyncTdEasy, String, Mono<String>> otpSupplier,
			Supplier<Mono<Void>> onUserbotClosed) {

		long phoneNumberLong = getLongPhoneNumber(phoneNumber);

		if (clients.containsKey(phoneNumberLong)) {
			return Mono.just(AddUserBotResult.newFailed("Userbot already added!"));
		}

		String alias = PhoneNumberUtil.getInstance().format(phoneNumber, PhoneNumberFormat.INTERNATIONAL);
		return Mono
				.fromCallable(() -> {
					return AsyncTdMiddleDirect.getAndDeployInstance(clusterManager, alias, "" + phoneNumberLong);
				})
				.subscribeOn(Schedulers.boundedElastic())
				.flatMap(v -> v)
				.map(middle -> new AsyncTdEasy(middle, alias)).flatMap(client -> {
					return client
							.execute(new TdApi.SetLogVerbosityLevel(0))
							.then(client
									.create(TdEasySettings
											.newBuilder()
											.setUseMessageDatabase(false)
											.setUseFileDatabase(false)
											.setUseChatInfoDatabase(false)
											.setApiId(apiId)
											.setApiHash(apiHash)
											.setEnableStorageOptimizer(false)
											.setApplicationVersion(App.VERSION)
											.setDatabaseDirectory("sessions" + File.separator + "userbot_" + phoneNumberLong)
											.setIgnoreFileNames(true)
											.setPhoneNumber(phoneNumberLong)
											.setSystemLanguageCode("en")
											.setDeviceModel(System.getProperty("os.name"))
											.setSystemVersion(System.getProperty("os.version"))
											.setParameterRequestHandler((parameter, parameterInfo) -> {
												switch (parameter) {
													case ASK_FIRST_NAME:
														return Mono.just("FirstName");
													case ASK_LAST_NAME:
														return Mono.just("LastName");
													case ASK_CODE:
														return codeSupplier
																.apply(client)
																.map(i -> "" + i)
																.switchIfEmpty(client
																		.send(new TdApi.Close())
																		.materialize()
																		.flatMap(signal -> onUserbotClosed.get().thenReturn(signal))
																		.dematerialize()
																		.then(Mono.empty()));
													case ASK_PASSWORD:
														return otpSupplier
																.apply(client, ((ParameterInfoPasswordHint) parameterInfo).getHint())
																.switchIfEmpty(client
																		.send(new TdApi.Close())
																		.materialize()
																		.flatMap(signal -> onUserbotClosed.get().thenReturn(signal))
																		.dematerialize()
																		.then(Mono.empty()));
													case NOTIFY_LINK:
													default:
														return Mono.empty();
												}
											})
											.build())
									.then(Mono.defer(() -> {
										var clientStateFlux = client.getState().skip(1).publish().autoConnect(2);

										clientStateFlux
												.filter(state -> state.getConstructor() == AuthorizationStateClosing.CONSTRUCTOR
														|| state.getConstructor() == AuthorizationStateClosed.CONSTRUCTOR
														|| state.getConstructor() == AuthorizationStateLoggingOut.CONSTRUCTOR)
												.take(1)
												.singleOrEmpty()
												.then()
												.materialize()
												.flatMap(signal -> onUserbotClosed.get().thenReturn(signal))
												.dematerialize()
												.subscribe(state -> System.out.println("Userbot closed with state: " + state));

										clientStateFlux.subscribe(state -> System.out.println("state: " + state));

										client
												.getIncomingUpdates()
												.flatMap(update -> onClientUpdate(update))
												.subscribe(_v -> {}, e -> System.err.println(e));

										return clientStateFlux
												.filter(state -> state.getConstructor() == AuthorizationStateClosing.CONSTRUCTOR
														|| state.getConstructor() == AuthorizationStateClosed.CONSTRUCTOR
														|| state.getConstructor() == AuthorizationStateLoggingOut.CONSTRUCTOR
														|| state.getConstructor() == AuthorizationStateReady.CONSTRUCTOR)
												.take(1)
												.singleOrEmpty()
												.doOnNext(state -> System.out.println("aState: " + state))
												.handle((state, sink) -> {
													if (state.getConstructor() == AuthorizationStateReady.CONSTRUCTOR) {
														sink.complete();
													} else {
														sink.error(new Exception(state.getClass().getSimpleName()));
													}
												})
												.then();
									}))
									.doOnSuccess((_v) -> clients.put(phoneNumberLong, new TransferClient(client))));
				})
				.map(_v -> AddUserBotResult.newSuccess());
	}

	private Mono<Void> onClientUpdate(Update update) {
		return Mono.empty();
	}

	private static long getLongPhoneNumber(PhoneNumber phoneNumber) {
		return Long.parseLong(PhoneNumberUtil
				.getInstance()
				.format(phoneNumber, PhoneNumberFormat.E164)
				.replace("+", ""));
	}

	@Override
	public Mono<Void> closeUserbot(PhoneNumber phoneNumber) {
		var client = clients.remove(getLongPhoneNumber(phoneNumber));
		if (client == null) {
			return Mono.error(new Exception("Userbot " + phoneNumber + " was not found!"));
		} else {
			return MonoUtils.thenOrError(client.send(new TdApi.Close()));
		}
	}

	@Override
	public Set<PhoneNumber> getPhoneNumbers() {
		var phonenumbers = new HashSet<PhoneNumber>();
		clients.forEach((phoneNumberLong, client) -> {
			try {
				phonenumbers.add(getUserbotPhoneNumber("+" + phoneNumberLong));
			} catch (NumberParseException e) {
				// Can't happen
				e.printStackTrace();
			}
		});
		return phonenumbers;
	}

	@Override
	public Set<BaseChatInfo> getAdminSupergroups(boolean canRestrictMembers, boolean canInviteUsers) {
		var adminSupergroups = clients
				.values()
				.stream()
				.flatMap((TransferClient transferClient) -> transferClient
						.getAdminSupergroups(canRestrictMembers, canInviteUsers)
						.stream())
				.collect(Collectors.toSet());
		return adminSupergroups;
	}

	@Override
	public Mono<Void> quit() {
		return Flux
				.fromIterable(clients.values())
				.flatMap(client -> client.send(new TdApi.Close()))
				.log()
				.collectList()
				.then();
	}
}