/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.epam.dlab.backendapi.dao;

import com.google.inject.Singleton;
import org.bson.Document;

import java.util.Set;
import java.util.stream.Collectors;

import static com.epam.dlab.backendapi.dao.MongoCollections.USER_GROUPS;
import static com.mongodb.client.model.Filters.elemMatch;
import static com.mongodb.client.model.Filters.eq;

@Singleton
public class UserGroupDaoImpl extends BaseDAO implements UserGroupDao {

	private static final String USERS_FIELD = "users";

	@Override
	public void addUsers(String group, Set<String> users) {
		updateOne(USER_GROUPS, eq(ID, group), addToSet(USERS_FIELD, users), true);
	}

	@Override
	public void updateUsers(String group, Set<String> users) {
		updateOne(USER_GROUPS, eq(ID, group), new Document(SET, new Document(USERS_FIELD, users)), true);
	}

	@Override
	public void removeUser(String group, String user) {
		updateOne(USER_GROUPS, eq(ID, group), pull(USERS_FIELD, user));
	}

	@Override
	public void removeGroup(String groupId) {
		deleteOne(USER_GROUPS, eq(ID, groupId));
	}

	@Override
	public Set<String> getUserGroups(String user) {
		return stream(find(USER_GROUPS, elemMatch(USERS_FIELD, new Document("$regex", "^" + user + "$")
				.append("$options", "i"))))
				.map(document -> document.getString(ID))
				.collect(Collectors.toSet());
	}
}