/**
 * 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.activemq.selector;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import javax.jms.JMSException;
import javax.jms.Message;

import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.MessageEvaluationContext;
import org.junit.Before;
import org.junit.Test;

public class UnknownHandlingSelectorTest {

    private Message message;

    @Before
    public void setUp() throws Exception {
        message = new ActiveMQMessage();
        message.setJMSDestination(new ActiveMQTopic("FOO.BAR"));
        message.setJMSType("selector-test");
        message.setJMSMessageID("connection:1:1:1:1");
        message.setBooleanProperty("trueProp", true);
        message.setBooleanProperty("falseProp", false);
        message.setObjectProperty("nullProp", null);
    }

    /**
     * | NOT
     * +------+------
     * |  T   |   F
     * |  F   |   T
     * |  U   |   U
     * +------+-------
     */
    @Test
    public void notEvaluation() throws Exception {
        assertSelector("not(trueProp)", false);
        assertSelector("not(falseProp)", true);
        assertSelector("not(unknownProp)", false);
    }

    /**
     * | AND  |   T   |   F   |   U
     * +------+-------+-------+-------
     * |  T   |   T   |   F   |   U
     * |  F   |   F   |   F   |   F
     * |  U   |   U   |   F   |   U
     * +------+-------+-------+-------
     */
    @Test
    public void andEvaluation() throws Exception {
        assertSelectorEvaluatesToTrue("trueProp AND trueProp");
        assertSelectorEvaluatesToFalse("trueProp AND falseProp");
        assertSelectorEvaluatesToFalse("falseProp AND trueProp");
        assertSelectorEvaluatesToFalse("falseProp AND falseProp");
        assertSelectorEvaluatesToFalse("falseProp AND unknownProp");
        assertSelectorEvaluatesToFalse("unknownProp AND falseProp");
        assertSelectorEvaluatesToUnknown("trueProp AND unknownProp");
        assertSelectorEvaluatesToUnknown("unknownProp AND trueProp");
        assertSelectorEvaluatesToUnknown("unknownProp AND unknownProp");
    }

    /**
     * | OR   |   T   |   F   |   U
     * +------+-------+-------+--------
     * |  T   |   T   |   T   |   T
     * |  F   |   T   |   F   |   U
     * |  U   |   T   |   U   |   U
     * +------+-------+-------+-------
     */
    @Test
    public void orEvaluation() throws Exception {
        assertSelectorEvaluatesToTrue("trueProp OR trueProp");
        assertSelectorEvaluatesToTrue("trueProp OR falseProp");
        assertSelectorEvaluatesToTrue("falseProp OR trueProp");
        assertSelectorEvaluatesToTrue("trueProp OR unknownProp");
        assertSelectorEvaluatesToTrue("unknownProp OR trueProp");
        assertSelectorEvaluatesToFalse("falseProp OR falseProp");
        assertSelectorEvaluatesToUnknown("falseProp OR unknownProp");
        assertSelectorEvaluatesToUnknown("unknownProp OR falseProp");
        assertSelectorEvaluatesToUnknown("unknownProp OR unknownProp");
    }

    @Test
    public void comparisonWithUnknownShouldEvaluateToUnknown() throws Exception {
        assertSelectorEvaluatesToUnknown("unknownProp = 0");
        assertSelectorEvaluatesToUnknown("unknownProp > 0");
        assertSelectorEvaluatesToUnknown("unknownProp >= 0");
        assertSelectorEvaluatesToUnknown("unknownProp < 0");
        assertSelectorEvaluatesToUnknown("unknownProp <= 0");
        assertSelectorEvaluatesToUnknown("unknownProp <> 0");
        assertSelectorEvaluatesToUnknown("unknownProp LIKE 'zero'");
        assertSelectorEvaluatesToUnknown("unknownProp NOT LIKE 'zero'");
        assertSelectorEvaluatesToUnknown("unknownProp IN ('zero')");
        assertSelectorEvaluatesToUnknown("unknownProp NOT IN ('zero')");
        assertSelectorEvaluatesToUnknown("unknownProp BETWEEN 1 AND 2");
        assertSelectorEvaluatesToUnknown("unknownProp NOT BETWEEN 1 AND 2");
    }

    @Test
    public void comparisonWithNullPropShouldEvaluateToUnknown() throws Exception {
        assertSelectorEvaluatesToUnknown("nullProp = 0");
        assertSelectorEvaluatesToUnknown("nullProp > 0");
        assertSelectorEvaluatesToUnknown("nullProp >= 0");
        assertSelectorEvaluatesToUnknown("nullProp < 0");
        assertSelectorEvaluatesToUnknown("nullProp <= 0");
        assertSelectorEvaluatesToUnknown("nullProp <> 0");
        assertSelectorEvaluatesToUnknown("nullProp LIKE 'zero'");
        assertSelectorEvaluatesToUnknown("nullProp NOT LIKE 'zero'");
        assertSelectorEvaluatesToUnknown("nullProp IN ('zero')");
        assertSelectorEvaluatesToUnknown("nullProp NOT IN ('zero')");
        assertSelectorEvaluatesToUnknown("nullProp BETWEEN 1 AND 2");
        assertSelectorEvaluatesToUnknown("nullProp NOT BETWEEN 1 AND 2");
    }

    @Test
    public void isNullIsNotNull() throws Exception {
        assertSelectorEvaluatesToTrue("unknownProp IS NULL");
        assertSelectorEvaluatesToTrue("nullProp IS NULL");
        assertSelectorEvaluatesToFalse("trueProp IS NULL");
        assertSelectorEvaluatesToFalse("unknownProp IS NOT NULL");
        assertSelectorEvaluatesToFalse("nullProp IS NOT NULL");
        assertSelectorEvaluatesToTrue("trueProp IS NOT NULL");
    }

    @Test
    public void arithmeticWithNull() throws Exception {
        assertSelectorEvaluatesToUnknown("-unknownProp = 0");
        assertSelectorEvaluatesToUnknown("+unknownProp = 0");
        assertSelectorEvaluatesToUnknown("unknownProp * 2 = 0");
        assertSelectorEvaluatesToUnknown("unknownProp / 2 = 0");
        assertSelectorEvaluatesToUnknown("unknownProp + 2 = 0");
        assertSelectorEvaluatesToUnknown("unknownProp - 2 = 0");
    }

    protected void assertSelectorEvaluatesToUnknown(String selector) throws JMSException {
        assertSelector(selector, false);
        assertSelector(not(selector), false);
    }
    protected void assertSelectorEvaluatesToTrue(String selector) throws JMSException {
        assertSelector(selector, true);
        assertSelector(not(selector), false);
    }

    protected void assertSelectorEvaluatesToFalse(String selector) throws JMSException {
        assertSelector(selector, false);
        assertSelector(not(selector), true);
    }

    protected void assertSelector(String text, boolean matches) throws JMSException {
        BooleanExpression selector = SelectorParser.parse(text);
        assertTrue("Created a valid selector", selector != null);
        MessageEvaluationContext context = new MessageEvaluationContext();
        context.setMessageReference((org.apache.activemq.command.Message)message);
        boolean value = selector.matches(context);
        assertEquals("Selector for: " + text, matches, value);
    }

    private static String not(String selector) {
        return "not(" + selector + ")";
    }
}