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package net.sourceforge.cruisecontrol.publishers.email;

import java.io.Serializable;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;

import net.sourceforge.cruisecontrol.publishers.EmailPublisher;

import org.apache.log4j.Logger;

public class EmailMapperHelper implements Serializable {

    private static final long serialVersionUID = 3831878181334595122L;

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

    /*
     * CACHE contains a Map with mapped users for each Publisher
     */
    private static final Map<Object, Map<String, String>> CACHE = new Hashtable<Object, Map<String, String>>();

    public static void addCacheEntry(final Object cache, final String user, final String mappedUser) {
        Map<String, String> map = CACHE.get(cache);
        if (map == null) {
            map = new Hashtable<String, String>();
            CACHE.put(cache, map);
        }
        map.put(user, mappedUser);
    }

    public static String getCachedUser(final Object cache, final String user) {
        String mappedUser = null;
        final Map<String, String> map = CACHE.get(cache);
        if (map != null) {
            mappedUser = map.get(user);
        }
        return mappedUser;
    }

    public void mapUsers(final EmailPublisher publisher, final Set<String> users, final Set<String> mappedUsers) {
        // first iterate over the users and check if mapping is cached
        for (Iterator userIterator = users.iterator(); userIterator.hasNext(); ) {
            final String user = (String) userIterator.next();
            final String mappedUser = getCachedUser(publisher, user);
            if (mappedUser != null) {
                LOG.debug("User " + user + " found in cache.  Mapped to: " + mappedUser);
                userIterator.remove();
                mappedUsers.add(mappedUser);
            }
        }

        // iterate over each mapper,
        // put the mapping into the cache if a hit and partissapates in caching
        final EmailMapper[] mappers = publisher.getEmailMapper();
        for (int i = 0; i < mappers.length; i++) {
            mappers[i].mapUsers(users, mappedUsers);
        }

        // take the still unmapped users and move them into the mappedUsers set
        for (Iterator<String> userIterator = users.iterator(); userIterator.hasNext(); ) {
            mappedUsers.add(userIterator.next());
            userIterator.remove();
        }
    }
}