/*
 * Copyright 2015 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.springframework.social.connect.jdbc;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.sql.DataSource;

import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.security.crypto.encrypt.TextEncryptor;
import org.springframework.social.connect.Connection;
import org.springframework.social.connect.ConnectionFactoryLocator;
import org.springframework.social.connect.ConnectionKey;
import org.springframework.social.connect.ConnectionRepository;
import org.springframework.social.connect.ConnectionSignUp;
import org.springframework.social.connect.UsersConnectionRepository;

/**
 * {@link UsersConnectionRepository} that uses the JDBC API to persist connection data to a relational database.
 * The supporting schema is defined in JdbcUsersConnectionRepository.sql.
 * @author Keith Donald
 */
public class JdbcUsersConnectionRepository implements UsersConnectionRepository {

	private final JdbcTemplate jdbcTemplate;
	
	private final ConnectionFactoryLocator connectionFactoryLocator;

	private final TextEncryptor textEncryptor;

	private ConnectionSignUp connectionSignUp;
	
	private String tablePrefix = "";

	public JdbcUsersConnectionRepository(DataSource dataSource, ConnectionFactoryLocator connectionFactoryLocator, TextEncryptor textEncryptor) {
		this.jdbcTemplate = new JdbcTemplate(dataSource);
		this.connectionFactoryLocator = connectionFactoryLocator;
		this.textEncryptor = textEncryptor;
	}

	@Override
	public void setConnectionSignUp(ConnectionSignUp connectionSignUp) {
		this.connectionSignUp = connectionSignUp;
	}

	/**
	 * Sets a table name prefix. This will be prefixed to all the table names before queries are executed. Defaults to "".
	 * This is can be used to qualify the table name with a schema or to distinguish Spring Social tables from other application tables. 
	 * @param tablePrefix the tablePrefix to set
	 */
	public void setTablePrefix(String tablePrefix) {
		this.tablePrefix = tablePrefix;
	}
	
	public List<String> findUserIdsWithConnection(Connection<?> connection) {
		ConnectionKey key = connection.getKey();
		List<String> localUserIds = jdbcTemplate.queryForList("select userId from " + tablePrefix + "UserConnection where providerId = ? and providerUserId = ?", String.class, key.getProviderId(), key.getProviderUserId());		
		if (localUserIds.size() == 0 && connectionSignUp != null) {
			String newUserId = connectionSignUp.execute(connection);
			if (newUserId != null)
			{
				createConnectionRepository(newUserId).addConnection(connection);
				return Arrays.asList(newUserId);
			}
		}
		return localUserIds;
	}

	public Set<String> findUserIdsConnectedTo(String providerId, Set<String> providerUserIds) {
		MapSqlParameterSource parameters = new MapSqlParameterSource();
		parameters.addValue("providerId", providerId);
		parameters.addValue("providerUserIds", providerUserIds);
		final Set<String> localUserIds = new HashSet<String>();
		return new NamedParameterJdbcTemplate(jdbcTemplate).query("select userId from " + tablePrefix + "UserConnection where providerId = :providerId and providerUserId in (:providerUserIds)", parameters,
			new ResultSetExtractor<Set<String>>() {
				public Set<String> extractData(ResultSet rs) throws SQLException, DataAccessException {
					while (rs.next()) {
						localUserIds.add(rs.getString("userId"));
					}
					return localUserIds;
				}
			});
	}

	public ConnectionRepository createConnectionRepository(String userId) {
		if (userId == null) {
			throw new IllegalArgumentException("userId cannot be null");
		}
		return new JdbcConnectionRepository(userId, jdbcTemplate, connectionFactoryLocator, textEncryptor, tablePrefix);
	}

}