/*
 * 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 org.apache.kylin.jdbc;

import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Set;

import com.google.common.collect.Sets;
import org.apache.calcite.avatica.AvaticaConnection;
import org.apache.calcite.avatica.DriverVersion;
import org.apache.calcite.avatica.Meta;
import org.apache.calcite.avatica.UnregisteredDriver;

/**
 * <p>
 * Kylin JDBC Driver based on Calcite Avatica and Kylin restful API.<br>
 * Supported versions:
 * </p>
 * <ul>
 * <li>jdbc 4.0</li>
 * <li>jdbc 4.1</li>
 * </ul>
 * 
 * <p>
 * Supported Statements:
 * </p>
 * <ul>
 * <li>{@link KylinStatement}</li>
 * <li>{@link KylinPreparedStatement}</li>
 * </ul>
 * 
 * <p>
 * Supported properties:
 * <ul>
 * <li>user: username</li>
 * <li>password: password</li>
 * <li>ssl: true/false</li>
 * <li>{@link #CLIENT_CALCITE_PROP_NAMES extras calcite props} like: caseSensitive, unquotedCasing, quoting, conformance</li>
 * </ul>
 * </p>
 * 
 * <p>
 * Driver init code sample:<br>
 * 
 * <pre>
 * Driver driver = (Driver) Class.forName(&quot;org.apache.kylin.kylin.jdbc.Driver&quot;).newInstance();
 * Properties info = new Properties();
 * info.setProperty(&quot;user&quot;, &quot;user&quot;);
 * info.setProperty(&quot;password&quot;, &quot;password&quot;);
 * info.setProperty(&quot;ssl&quot;, &quot;true&quot;);
 * info.setProperty(&quot;caseSensitive&quot;, &quot;true&quot;);
 * Connection conn = driver.connect(&quot;jdbc:kylin://{domain}/{project}&quot;, info);
 * </pre>
 * 
 * </p>
 */
public class Driver extends UnregisteredDriver {

    public static final String CONNECT_STRING_PREFIX = "jdbc:kylin:";

    /**
     * These calcite props can be configured by jdbc connection
     */
    protected static final Set<String> CLIENT_CALCITE_PROP_NAMES = Sets.newHashSet(
            "caseSensitive",
            "unquotedCasing",
            "quoting",
            "conformance"
    );

    static {
        try {
            DriverManager.registerDriver(new Driver());
        } catch (SQLException e) {
            throw new RuntimeException("Error occurred while registering JDBC driver " + Driver.class.getName() + ": " + e.toString());
        }
    }

    @Override
    protected String getConnectStringPrefix() {
        return CONNECT_STRING_PREFIX;
    }

    @Override
    protected DriverVersion createDriverVersion() {
        return DriverVersion.load(Driver.class, "org-apache-kylin-jdbc.properties", "Kylin JDBC Driver", "unknown version", "Kylin", "unknown version");
    }

    @Override
    protected String getFactoryClassName(JdbcVersion jdbcVersion) {
        switch (jdbcVersion) {
        case JDBC_30:
            throw new UnsupportedOperationException();
        case JDBC_40:
            return KylinJdbcFactory.Version40.class.getName();
        case JDBC_41:
        default:
            return KylinJdbcFactory.Version41.class.getName();
        }
    }

    @Override
    public Meta createMeta(AvaticaConnection connection) {
        return new KylinMeta((KylinConnection) connection);
    }

    //    @Override
    //    protected Handler createHandler() {
    //        return new HandlerImpl() {
    //            @Override
    //            public void onConnectionInit(AvaticaConnection connection) throws SQLException {
    //                KylinConnection conn = (KylinConnection) connection;
    //                RemoteClient runner = ((KylinJdbcFactory) factory).newRemoteClient(conn);
    //                try {
    //                    runner.connect();
    //                    conn.setMetaProject(runner.getMetadata(conn.getProject()));
    //                    logger.debug("Connection inited.");
    //                } catch (ConnectionException e) {
    //                    logger.error(e.getLocalizedMessage(), e);
    //                    throw new SQLException(e.getLocalizedMessage());
    //                }
    //            }
    //
    //            public void onConnectionClose(AvaticaConnection connection) {
    //                logger.debug("Connection closed.");
    //            }
    //
    //            public void onStatementExecute(AvaticaStatement statement, ResultSink resultSink) {
    //                logger.debug("statement executed.");
    //            }
    //
    //            public void onStatementClose(AvaticaStatement statement) {
    //                logger.debug("statement closed.");
    //            }
    //        };
    //    }

}
