/*
 * Copyright 2005-2010 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wamblee.security.authentication;

import java.util.logging.Logger;

/**
 * User administration initializer. It populates the user administration with a
 * number of groups and users but only in case no users exist.
 * 
 * @author Erik Brakkee
 */
public class UserAdminInitializer {
    private static final Logger LOGGER = Logger
        .getLogger(UserAdminInitializer.class.getName());

    /**
     * Initializes the user administration in case no users are present.
     * 
     */
    public UserAdminInitializer(UserAdministration aAdmin, String[] aUsers,
        String[] aGroups, String[] aPasswords) throws UserMgtException {
        if ((aUsers.length != aGroups.length) ||
            (aUsers.length != aPasswords.length)) {
            throw new IllegalArgumentException(
                "Array sizes for users, groups, and passwords differ: " +
                    aUsers.length + "," + aGroups.length + "," +
                    aPasswords.length);
        }

        if (aAdmin.getUserCount() == 0) {
            initialize(aAdmin, aUsers, aGroups, aPasswords);
        }
    }

    /**
     * Adds the specified users and groups to the user administration.
     * 
     * @param aAdmin
     *            User administration.
     * @param aUsers
     *            Users.
     * @param aGroups
     *            Groups.
     * @param aPasswords
     *            Passwords.
     * 
     * @throws UserMgtException
     *             In case of a problem creating users or groups.
     */
    private void initialize(UserAdministration aAdmin, String[] aUsers,
        String[] aGroups, String[] aPasswords) throws UserMgtException {
        for (int i = 0; i < aUsers.length; i++) {
            String user = aUsers[i];
            String group = aGroups[i];
            String password = aPasswords[i];

            if (!aAdmin.checkUser(user)) {
                if (!(aAdmin.checkGroup(group))) {
                    // must create group
                    LOGGER.info("Creating group: " + group);
                    aAdmin.createGroup(group);
                }
                LOGGER
                    .info("Creating user: " + user + " password: " + password);
                aAdmin.createUser(user, password);
                aAdmin.addUserToGroup(user, group);
            }
        }
    }
}