package it.tdlight.client;

import it.tdlight.common.ExceptionHandler;
import it.tdlight.common.TelegramClient;
import it.tdlight.jni.TdApi;
import it.tdlight.jni.TdApi.AuthorizationStateWaitRegistration;
import it.tdlight.jni.TdApi.RegisterUser;
import it.tdlight.jni.TdApi.UpdateAuthorizationState;

final class AuthorizationStateWaitRegistrationHandler implements GenericUpdateHandler<UpdateAuthorizationState> {

	private final TelegramClient client;
	private final ClientInteraction clientInteraction;
	private final ExceptionHandler exceptionHandler;

	public AuthorizationStateWaitRegistrationHandler(TelegramClient client,
			ClientInteraction clientInteraction,
			ExceptionHandler exceptionHandler) {
		this.client = client;
		this.clientInteraction = clientInteraction;
		this.exceptionHandler = exceptionHandler;
	}

	@Override
	public void onUpdate(UpdateAuthorizationState update) {
		if (update.authorizationState.getConstructor() == AuthorizationStateWaitRegistration.CONSTRUCTOR) {
			TdApi.AuthorizationStateWaitRegistration authorizationState = (TdApi.AuthorizationStateWaitRegistration) update.authorizationState;
			clientInteraction.onParameterRequest(InputParameter.TERMS_OF_SERVICE,
					new ParameterInfoTermsOfService(authorizationState.termsOfService)
			);
			String firstName = clientInteraction.onParameterRequest(InputParameter.ASK_FIRST_NAME, new EmptyParameterInfo());
			String lastName = clientInteraction.onParameterRequest(InputParameter.ASK_LAST_NAME, new EmptyParameterInfo());
			if (firstName == null || firstName.isEmpty()) {
				exceptionHandler.onException(new IllegalArgumentException("First name must not be null or empty"));
				return;
			}
			if (firstName.length() > 64) {
				exceptionHandler.onException(new IllegalArgumentException("First name must be under 64 characters"));
				return;
			}
			if (lastName == null) {
				exceptionHandler.onException(new IllegalArgumentException("Last name must not be null"));
				return;
			}
			if (lastName.length() > 64) {
				exceptionHandler.onException(new IllegalArgumentException("Last name must be under 64 characters"));
				return;
			}
			RegisterUser response = new RegisterUser(firstName, lastName);
			client.send(response, ok -> {
				if (ok.getConstructor() == Error.CONSTRUCTOR) {
					throw new TelegramError((Error) ok);
				}
			}, exceptionHandler);
		}
	}
}