/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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.apache.qpid.topic;

import org.apache.qpid.client.AMQSession;
import org.apache.qpid.client.AMQTopic;

import javax.jms.*;

/**
 */
class MessageFactory
{
    private static final char[] DATA = "abcdefghijklmnopqrstuvwxyz".toCharArray();

    private final Session _session;
    private final Topic _topic;
    private final Topic _control;
    private final byte[] _payload;


    MessageFactory(Session session) throws JMSException
    {
        this(session, 256);
    }

    MessageFactory(Session session, int size) throws JMSException
    {
        _session = session;
        if(session instanceof AMQSession)
        {
            _topic = new AMQTopic("topictest.messages");
            _control = new AMQTopic("topictest.control");
        }
        else
        {
            _topic = session.createTopic("topictest.messages");
            _control = session.createTopic("topictest.control");
        }
        _payload = new byte[size];

        for(int i = 0; i < size; i++)
        {
            _payload[i] = (byte) DATA[i % DATA.length];
        }
    }

    Topic getTopic()
    {
        return _topic;
    }

    Message createEventMessage() throws JMSException
    {
        BytesMessage msg = _session.createBytesMessage();
        msg.writeBytes(_payload);
        return msg;
    }

    Message createShutdownMessage() throws JMSException
    {
        return _session.createTextMessage("SHUTDOWN");
    }

    Message createReportRequestMessage() throws JMSException
    {
        return _session.createTextMessage("REPORT");
    }

    Message createReportResponseMessage(String msg) throws JMSException
    {
        return _session.createTextMessage(msg);
    }

    boolean isShutdown(Message m)
    {
        return checkText(m, "SHUTDOWN");
    }

    boolean isReport(Message m)
    {
        return checkText(m, "REPORT");
    }

    Object getReport(Message m)
    {
        try
        {
            return ((TextMessage) m).getText();
        }
        catch (JMSException e)
        {
            e.printStackTrace(System.out);
            return e.toString();
        }
    }

    MessageConsumer createTopicConsumer() throws Exception
    {
        return _session.createConsumer(_topic);
    }

    MessageConsumer createDurableTopicConsumer(String name) throws Exception
    {
        return _session.createDurableSubscriber(_topic, name);
    }

    MessageConsumer createControlConsumer() throws Exception
    {
        return _session.createConsumer(_control);
    }

    MessageProducer createTopicPublisher() throws Exception
    {
        return _session.createProducer(_topic);
    }

    MessageProducer createControlPublisher() throws Exception
    {
        return _session.createProducer(_control);
    }

    private static boolean checkText(Message m, String s)
    {
        try
        {
            return m instanceof TextMessage && ((TextMessage) m).getText().equals(s);
        }
        catch (JMSException e)
        {
            e.printStackTrace(System.out);
            return false;
        }
    }
}
