/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.translator.cassandra;

import java.util.List;

import javax.resource.cci.ConnectionFactory;

import org.teiid.core.BundleUtil;
import org.teiid.language.Argument;
import org.teiid.language.Call;
import org.teiid.language.Command;
import org.teiid.language.QueryExpression;
import org.teiid.language.visitor.SQLStringVisitor;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.metadata.RuntimeMetadata;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.ExecutionFactory;
import org.teiid.translator.MetadataProcessor;
import org.teiid.translator.ProcedureExecution;
import org.teiid.translator.ResultSetExecution;
import org.teiid.translator.Translator;
import org.teiid.translator.TranslatorException;
import org.teiid.translator.UpdateExecution;

import com.datastax.driver.core.ProtocolVersion;


@Translator(name = "cassandra", description = "A translator for Cassandra NoSql database")
public class CassandraExecutionFactory extends ExecutionFactory<ConnectionFactory, CassandraConnection> {
	public static final BundleUtil UTIL = BundleUtil.getBundleUtil(CassandraExecutionFactory.class);

	public static enum Event implements BundleUtil.Event {
		TEIID22000
	}

	private boolean isV2;
	
	@Override
	public void start() throws TranslatorException {
		super.start();
		setTransactionSupport(TransactionSupport.NONE);
		LogManager.logTrace(LogConstants.CTX_CONNECTOR, "Cassandra ExecutionFactory Started"); //$NON-NLS-1$
	}

	@Override
	public ResultSetExecution createResultSetExecution(QueryExpression command,
			ExecutionContext executionContext, RuntimeMetadata metadata,
			CassandraConnection connection) throws TranslatorException {
		return new CassandraQueryExecution(command, connection, executionContext);
	}

	@Override
	public UpdateExecution createUpdateExecution(Command command,
			ExecutionContext executionContext, RuntimeMetadata metadata,
			CassandraConnection connection) throws TranslatorException {
		return new CassandraUpdateExecution(command, executionContext, metadata, connection);
	} 
	
	@Override
	public ProcedureExecution createProcedureExecution(Call command,
			ExecutionContext executionContext, RuntimeMetadata metadata,
			CassandraConnection connection) throws TranslatorException {
		String nativeQuery = command.getMetadataObject().getProperty(SQLStringVisitor.TEIID_NATIVE_QUERY, false);
		if (nativeQuery != null) {
			return new CassandraDirectQueryExecution(nativeQuery, command.getArguments(), command, connection, executionContext, false);
		}
		throw new TranslatorException("Missing native-query extension metadata."); //$NON-NLS-1$
	}
	
	@Override
	public ProcedureExecution createDirectExecution(List<Argument> arguments,
			Command command, ExecutionContext executionContext,
			RuntimeMetadata metadata, CassandraConnection connection)
			throws TranslatorException {
		return new CassandraDirectQueryExecution((String) arguments.get(0).getArgumentValue().getValue(), arguments.subList(1, arguments.size()), command, connection, executionContext, true);
	}
	
	@Override
    public MetadataProcessor<CassandraConnection> getMetadataProcessor(){
	    return new CassandraMetadataProcessor();
	}

	@Override
	public boolean supportsOrderBy() {
		// Order by is allowed in very restrictive case when this is used as 
		// compound primary key's second column where it is defined partioned key
		return false;
	}

	@Override
	public boolean supportsAggregatesCountStar() {
		return true;
	}

	@Override
	public boolean supportsCompareCriteriaEquals() {
		return true;
	}

	@Override
	public boolean supportsCompareCriteriaOrdered() {
		return true;
	}

	@Override
	public boolean supportsInCriteria() {
		return true;
	}

	@Override
	public boolean supportsRowLimit() {
		return true;
	}
	
	@Override
	public boolean supportsBulkUpdate() {
		return isV2;
	}
	
	@Override
	public boolean supportsBatchedUpdates() {
		return isV2;
	}
	
	@Override
	public boolean returnsSingleUpdateCount() {
		return true;
	}
	
	@Override
	public void initCapabilities(CassandraConnection connection)
			throws TranslatorException {
		if (connection == null) {
			return;
		}
		if (connection.getVersion().compareTo(ProtocolVersion.V2) >= 0) {
			this.isV2 = true;
		}
	}
	
	@Override
	public boolean isSourceRequiredForCapabilities() {
		return true;
	}
	
}
