/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * 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.teiid.resource.adapter.cassandra;

import java.util.List;
import java.util.Set;

import javax.resource.ResourceException;

import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.resource.spi.BasicConnection;
import org.teiid.translator.TranslatorException;
import org.teiid.translator.cassandra.CassandraConnection;

import com.datastax.driver.core.*;

/**
 * Represents a connection to Cassandra database.
 * */
public class CassandraConnectionImpl extends BasicConnection implements CassandraConnection{
	private CassandraManagedConnectionFactory config;
	private Cluster cluster = null;
	private Session session = null;
	private Metadata metadata = null;
	private VersionNumber version;
	
	public CassandraConnectionImpl(CassandraManagedConnectionFactory config, Metadata metadata) {
		this.config = config;
		this.metadata = metadata;
	}

	public CassandraConnectionImpl(CassandraManagedConnectionFactory config) {
		this.config = config;
		
		Cluster.Builder builder  = Cluster.builder().addContactPoint(config.getAddress());
		
		if (this.config.getUsername() != null) {
		    builder.withCredentials(this.config.getUsername(), this.config.getPassword());
		}
		
		if (this.config.getPort() != null) {
		    builder.withPort(this.config.getPort());
		}
		
		this.cluster = builder.build();
		
		this.metadata = cluster.getMetadata();
		
		this.session = cluster.connect(config.getKeyspace());
		
		Set<Host> allHosts = cluster.getMetadata().getAllHosts();
		if (!allHosts.isEmpty()) {
            Host host = allHosts.iterator().next();
            this.version = host.getCassandraVersion();
		}
	}

	@Override
	public void close() throws ResourceException {
		if(cluster != null){
			cluster.close();
		}
		LogManager.logDetail(LogConstants.CTX_CONNECTOR, CassandraManagedConnectionFactory.UTIL.getString("shutting_down")); //$NON-NLS-1$
	}
	
	@Override
	public boolean isAlive() {
		LogManager.logDetail(LogConstants.CTX_CONNECTOR, CassandraManagedConnectionFactory.UTIL.getString("alive")); //$NON-NLS-1$
		return true;
	}
	
	@Override
	public ResultSetFuture executeQuery(String query){
		return session.executeAsync(query);
	}
	
	@Override
	public ResultSetFuture executeBatch(List<String> updates){
		BatchStatement bs = new BatchStatement();
		for (String update : updates) {
			bs.add(new SimpleStatement(update));
		}
		return session.executeAsync(bs);
	}
	
	@Override
	public ResultSetFuture executeBatch(String update, List<Object[]> values) {
		PreparedStatement ps = session.prepare(update);
		BatchStatement bs = new BatchStatement();
		for (Object[] bindValues : values) {
			BoundStatement bound = ps.bind(bindValues);
			bs.add(bound);
		}
		return session.executeAsync(bs);
	}

	@Override
	public KeyspaceMetadata keyspaceInfo() throws TranslatorException {
		String keyspace = config.getKeyspace();
		KeyspaceMetadata result = metadata.getKeyspace(keyspace);
		if (result == null && keyspace.length() > 2 && keyspace.charAt(0) == '"' && keyspace.charAt(keyspace.length() - 1) == '"') {
			//try unquoted
			keyspace = keyspace.substring(1, keyspace.length() - 1);
			result = metadata.getKeyspace(keyspace);
		}
		if (result == null) {
			throw new TranslatorException(keyspace);
		}
		return result;
	}
	
	@Override
	public VersionNumber getVersion() {
		return version;
	}
	
}
