package dslab.protocol.dmap;

import dslab.authentication.AuthenticationException;
import dslab.authentication.AuthenticationService;
import dslab.mailbox.MailboxManager;
import dslab.mailbox.MessageNotFoundException;
import dslab.protocol.Message;

import java.util.List;
import java.util.logging.Logger;

import static java.lang.Thread.currentThread;

/**
 * Contains the mailbox server's processing logic for DMAP commands.
 */
public class DmapImpl implements Dmap {

    private static final Logger LOG = Logger.getLogger(DmapImpl.class.getSimpleName());

    private final MailboxManager mailboxManager;
    private final AuthenticationService authenticationService;

    public DmapImpl(MailboxManager mailboxManager, AuthenticationService authenticationService) {

        this.mailboxManager = mailboxManager;
        this.authenticationService = authenticationService;
    }

    @Override
    public void login(String username, String password) throws AuthenticationException {
        authenticationService.login(username, password);
    }

    @Override
    public void logout() throws AuthenticationException {
        assertLoggedIn();
        authenticationService.logout();
    }

    @Override
    public void quit() {
        currentThread().interrupt(); //this is checked in for-loop
    }

    @Override
    public void delete(Integer id) throws AuthenticationException, MessageNotFoundException {
        assertLoggedIn();
        mailboxManager.deleteMessage(id);
    }

    @Override
    public Message show(Integer id) throws AuthenticationException, MessageNotFoundException {
        assertLoggedIn();
        return mailboxManager.getMessage(id);
    }

    @Override
    public List<MessageMetadata> list() throws AuthenticationException {
        assertLoggedIn();
        var mailbox = mailboxManager.getMailbox(authenticationService.getLoggedInUser());
        LOG.info("Listing " + mailbox);
        return mailbox.getMessageMetadata();
    }

    private void assertLoggedIn() throws AuthenticationException {
        if (!authenticationService.isLoggedIn())
            throw new AuthenticationException("Not logged in");
    }
}