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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.webadmin.service;

import static org.apache.james.mailbox.MailboxManager.MailboxSearchFetchType.Minimal;

import java.util.List;
import java.util.stream.Stream;

import javax.inject.Inject;

import org.apache.james.core.Username;
import org.apache.james.mailbox.MailboxManager;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.exception.MailboxExistsException;
import org.apache.james.mailbox.exception.MailboxNotFoundException;
import org.apache.james.mailbox.model.MailboxMetaData;
import org.apache.james.mailbox.model.MailboxPath;
import org.apache.james.mailbox.model.search.MailboxQuery;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;
import org.apache.james.webadmin.dto.MailboxResponse;
import org.apache.james.webadmin.utils.MailboxHaveChildrenException;
import org.apache.james.webadmin.validation.MailboxName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.fge.lambdas.Throwing;
import com.github.steveash.guavate.Guavate;
import com.google.common.base.Preconditions;

import reactor.core.publisher.Mono;


public class UserMailboxesService {
    private static final Logger LOGGER = LoggerFactory.getLogger(UserMailboxesService.class);

    private final MailboxManager mailboxManager;
    private final UsersRepository usersRepository;

    @Inject
    public UserMailboxesService(MailboxManager mailboxManager, UsersRepository usersRepository) {
        this.mailboxManager = mailboxManager;
        this.usersRepository = usersRepository;
    }

    public void createMailbox(Username username, MailboxName mailboxName) throws MailboxException, UsersRepositoryException {
        usernamePreconditions(username);
        MailboxSession mailboxSession = mailboxManager.createSystemSession(username);
        try {
            MailboxPath mailboxPath = MailboxPath.forUser(username, mailboxName.asString())
                .assertAcceptable(mailboxSession.getPathDelimiter());
            mailboxManager.createMailbox(mailboxPath, mailboxSession);
        } catch (MailboxExistsException e) {
            LOGGER.info("Attempt to create mailbox {} for user {} that already exists", mailboxName, username);
        }
    }

    public void deleteMailboxes(Username username) throws MailboxException, UsersRepositoryException {
        usernamePreconditions(username);
        MailboxSession mailboxSession = mailboxManager.createSystemSession(username);
        listUserMailboxes(mailboxSession)
            .map(MailboxMetaData::getPath)
            .forEach(Throwing.consumer(mailboxPath -> deleteMailbox(mailboxSession, mailboxPath)));
    }

    public List listMailboxes(Username username) throws MailboxException, UsersRepositoryException {
        usernamePreconditions(username);
        MailboxSession mailboxSession = mailboxManager.createSystemSession(username);
        return listUserMailboxes(mailboxSession)
            .map(mailboxMetaData -> new MailboxResponse(mailboxMetaData.getPath().getName(), mailboxMetaData.getId()))
            .collect(Guavate.toImmutableList());
    }

    public boolean testMailboxExists(Username username, MailboxName mailboxName) throws MailboxException, UsersRepositoryException {
        usernamePreconditions(username);
        MailboxSession mailboxSession = mailboxManager.createSystemSession(username);
        MailboxPath mailboxPath = MailboxPath.forUser(username, mailboxName.asString())
            .assertAcceptable(mailboxSession.getPathDelimiter());
        return Mono.from(mailboxManager.mailboxExists(mailboxPath, mailboxSession))
            .block();
    }

    public void deleteMailbox(Username username, MailboxName mailboxName) throws MailboxException, UsersRepositoryException, MailboxHaveChildrenException {
        usernamePreconditions(username);
        MailboxSession mailboxSession = mailboxManager.createSystemSession(username);
        MailboxPath mailboxPath = MailboxPath.forUser(username, mailboxName.asString())
            .assertAcceptable(mailboxSession.getPathDelimiter());
        listChildren(mailboxPath, mailboxSession)
            .forEach(Throwing.consumer(path -> deleteMailbox(mailboxSession, path)));
    }

    private Stream listChildren(MailboxPath mailboxPath, MailboxSession mailboxSession) throws MailboxException {
        return listUserMailboxes(mailboxSession)
            .map(MailboxMetaData::getPath)
            .filter(path -> path.getHierarchyLevels(mailboxSession.getPathDelimiter()).contains(mailboxPath));
    }

    private void deleteMailbox(MailboxSession mailboxSession, MailboxPath mailboxPath) throws MailboxException {
        try {
            mailboxManager.deleteMailbox(mailboxPath, mailboxSession);
        } catch (MailboxNotFoundException e) {
            LOGGER.info("Attempt to delete mailbox {} for user {} that does not exists", mailboxPath.getName(), mailboxPath.getUser());
        }
    }

    private void usernamePreconditions(Username username) throws UsersRepositoryException {
        Preconditions.checkState(usersRepository.contains(username), "User does not exist");
    }

    private Stream listUserMailboxes(MailboxSession mailboxSession) throws MailboxException {
        return mailboxManager.search(
            MailboxQuery.privateMailboxesBuilder(mailboxSession).build(),
            Minimal, mailboxSession)
            .toStream();
    }

}