package com.tesora.dve.worker;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import com.tesora.dve.concurrent.CompletionHandle;
import com.tesora.dve.db.CommandChannel;
import com.tesora.dve.db.DBNative;
import com.tesora.dve.db.NativeResultHandler;
import com.tesora.dve.db.NativeTypeCatalog;
import com.tesora.dve.db.mysql.*;
import com.tesora.dve.db.mysql.libmy.MyMessage;
import com.tesora.dve.db.mysql.portal.protocol.MSPComQueryRequestMessage;
import com.tesora.dve.server.global.HostService;
import com.tesora.dve.singleton.Singletons;

import io.netty.channel.ChannelHandlerContext;

import java.util.List;

import com.tesora.dve.charset.MysqlNativeCharSet;
import com.tesora.dve.db.mysql.libmy.MyEOFPktResponse;
import com.tesora.dve.db.mysql.libmy.MyTextDataResponse;
import com.tesora.dve.exceptions.PEException;
import com.tesora.dve.resultset.ColumnMetadata;
import com.tesora.dve.resultset.ColumnSet;
import com.tesora.dve.resultset.ResultRow;
import com.tesora.dve.server.messaging.SQLCommand;

public class MysqlTextResultForwarder extends MysqlDemultiplexingResultForwarder {

	public MysqlTextResultForwarder(ChannelHandlerContext outboundCtx) {
		super(outboundCtx);
	}

	@Override
	public void inject(ColumnSet metadata, List<ResultRow> rows) throws PEException {

		outboundCtx.write(new MSPResultSetResponse(metadata.size()));

		DBNative dbNative = Singletons.require(DBNative.class);
		NativeTypeCatalog nativeTypeCatalog = dbNative.getTypeCatalog();

		for (ColumnMetadata cm : metadata.getColumnList()) {
			//                MSPFieldResponse mspFieldResponse = new MSPFieldResponse(cm, nativeTypeCatalog, MysqlNativeCharSet.UTF8);
			MyMessage mspFieldResponse = FieldMetadataAdapter.buildPacket(cm, nativeTypeCatalog, MysqlNativeCharSet.UTF8);
			outboundCtx.write(mspFieldResponse);
		}
		outboundCtx.write(new MyEOFPktResponse());

		for (ResultRow row : rows) {
			NativeResultHandler resultHandler = Singletons.require(DBNative.class).getResultHandler();
			outboundCtx.write(new MyTextDataResponse(resultHandler,metadata, row));
		}
		outboundCtx.flush();

		super.setHasResults();
	}

    @Override
    public Bundle getDispatchBundle(CommandChannel channel, SQLCommand sql, CompletionHandle<Boolean> promise) {
        MysqlMessage message = MSPComQueryRequestMessage.newMessage(sql.getBytes());
        return new Bundle( message, new MysqlExecuteCommand(sql, channel.getMonitor(), this, promise));
	}

}