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package org.apache.james.jmap.http;

import static org.apache.james.metrics.api.TimeMetric.ExecutionResult.DEFAULT_100_MS_THRESHOLD;

import java.util.UUID;

import javax.inject.Inject;

import org.apache.james.core.Username;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.metrics.api.MetricFactory;
import org.apache.james.metrics.api.TimeMetric;
import org.apache.james.user.api.AlreadyExistInUsersRepositoryException;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;

import com.google.common.annotations.VisibleForTesting;

import reactor.core.publisher.Mono;

public class UserProvisioner {
    private final UsersRepository usersRepository;
    private final MetricFactory metricFactory;

    @Inject
    @VisibleForTesting
    UserProvisioner(UsersRepository usersRepository, MetricFactory metricFactory) {
        this.usersRepository = usersRepository;
        this.metricFactory = metricFactory;
    }

    public Mono provisionUser(MailboxSession session) {
        if (session != null && !usersRepository.isReadOnly()) {
            return Mono.fromRunnable(() -> createAccountIfNeeded(session));
        }
        return Mono.empty();
    }

    private void createAccountIfNeeded(MailboxSession session) {
        TimeMetric timeMetric = metricFactory.timer("JMAP-user-provisioning");
        try {
            Username username = session.getUser();
            if (needsAccountCreation(username)) {
                createAccount(username);
            }
        } catch (AlreadyExistInUsersRepositoryException e) {
            // Ignore
        } catch (UsersRepositoryException e) {
            throw new RuntimeException(e);
        } finally {
            timeMetric.stopAndPublish().logWhenExceedP99(DEFAULT_100_MS_THRESHOLD);
        }
    }

    private void createAccount(Username username) throws UsersRepositoryException {
        usersRepository.addUser(username, generatePassword());
    }

    private boolean needsAccountCreation(Username username) throws UsersRepositoryException {
        return !usersRepository.contains(username);
    }

    private String generatePassword() {
        return UUID.randomUUID().toString();
    }
}