/*
 * 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.log4j.spi;

import static org.apache.log4j.TestConstants.TEST_WITNESS_PREFIX;

import org.apache.log4j.Category;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.MDC;
import org.apache.log4j.NDC;
import org.apache.log4j.Priority;
import org.apache.log4j.util.SerializationTestHelper;

import junit.framework.TestCase;

/**
 * Tests LoggingEvent.
 *
 * @author Curt Arnold
 */
public class LoggingEventTest extends TestCase {
    /**
     * Create LoggingEventTest.
     *
     * @param name test name.
     */
    public LoggingEventTest(final String name) {
	super(name);
    }

    /**
     * Serialize a simple logging event and check it against a witness.
     * 
     * @throws Exception if exception during test.
     */
    public void testSerializationSimple() throws Exception {
	Logger root = Logger.getRootLogger();
	LoggingEvent event = new LoggingEvent(root.getClass().getName(), root, Level.INFO, "Hello, world.", null);
//    event.prepareForDeferredProcessing();

	int[] skip = new int[] { 352, 353, 354, 355, 356 };
	SerializationTestHelper.assertSerializationEquals(TEST_WITNESS_PREFIX + "serialization/simple.bin", event, skip,
		237);
    }

    /**
     * Serialize a logging event with an exception and check it against a witness.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testSerializationWithException() throws Exception {
	Logger root = Logger.getRootLogger();
	Exception ex = new Exception("Don't panic");
	LoggingEvent event = new LoggingEvent(root.getClass().getName(), root, Level.INFO, "Hello, world.", ex);
//    event.prepareForDeferredProcessing();

	int[] skip = new int[] { 352, 353, 354, 355, 356 };
	SerializationTestHelper.assertSerializationEquals(TEST_WITNESS_PREFIX + "serialization/exception.bin", event,
		skip, 237);
    }

    /**
     * Serialize a logging event with an exception and check it against a witness.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testSerializationWithLocation() throws Exception {
	Logger root = Logger.getRootLogger();
	LoggingEvent event = new LoggingEvent(root.getClass().getName(), root, Level.INFO, "Hello, world.", null);
	event.getLocationInformation();
//    event.prepareForDeferredProcessing();

	int[] skip = new int[] { 352, 353, 354, 355, 356 };
	SerializationTestHelper.assertSerializationEquals(TEST_WITNESS_PREFIX + "serialization/location.bin", event,
		skip, 237);
    }

    /**
     * Serialize a logging event with ndc.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testSerializationNDC() throws Exception {
	Logger root = Logger.getRootLogger();
	NDC.push("ndc test");

	LoggingEvent event = new LoggingEvent(root.getClass().getName(), root, Level.INFO, "Hello, world.", null);
//    event.prepareForDeferredProcessing();

	int[] skip = new int[] { 352, 353, 354, 355, 356 };
	SerializationTestHelper.assertSerializationEquals(TEST_WITNESS_PREFIX + "serialization/ndc.bin", event, skip,
		237);
    }

    /**
     * Serialize a logging event with mdc.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testSerializationMDC() throws Exception {
	Logger root = Logger.getRootLogger();
	MDC.put("mdckey", "mdcvalue");

	LoggingEvent event = new LoggingEvent(root.getClass().getName(), root, Level.INFO, "Hello, world.", null);
//    event.prepareForDeferredProcessing();

	int[] skip = new int[] { 352, 353, 354, 355, 356 };
	SerializationTestHelper.assertSerializationEquals(TEST_WITNESS_PREFIX + "serialization/mdc.bin", event, skip,
		237);
    }

    /**
     * Deserialize a simple logging event.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testDeserializationSimple() throws Exception {
	Object obj = SerializationTestHelper.deserializeStream(TEST_WITNESS_PREFIX + "serialization/simple.bin");
	assertTrue(obj instanceof LoggingEvent);

	LoggingEvent event = (LoggingEvent) obj;
	assertEquals("Hello, world.", event.getMessage());
	assertEquals(Level.INFO, event.getLevel());
    }

    /**
     * Deserialize a logging event with an exception.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testDeserializationWithException() throws Exception {
	Object obj = SerializationTestHelper.deserializeStream(TEST_WITNESS_PREFIX + "serialization/exception.bin");
	assertTrue(obj instanceof LoggingEvent);

	LoggingEvent event = (LoggingEvent) obj;
	assertEquals("Hello, world.", event.getMessage());
	assertEquals(Level.INFO, event.getLevel());
    }

    /**
     * Deserialize a logging event with an exception.
     * 
     * @throws Exception if exception during test.
     *
     */
    public void testDeserializationWithLocation() throws Exception {
	Object obj = SerializationTestHelper.deserializeStream(TEST_WITNESS_PREFIX + "serialization/location.bin");
	assertTrue(obj instanceof LoggingEvent);

	LoggingEvent event = (LoggingEvent) obj;
	assertEquals("Hello, world.", event.getMessage());
	assertEquals(Level.INFO, event.getLevel());
    }

    /**
     * Tests LoggingEvent.fqnOfCategoryClass.
     */
    public void testFQNOfCategoryClass() {
	Category root = Logger.getRootLogger();
	Priority info = Level.INFO;
	String catName = Logger.class.toString();
	LoggingEvent event = new LoggingEvent(catName, root, info, "Hello, world.", null);
	assertEquals(catName, event.fqnOfCategoryClass);
    }

    /**
     * Tests LoggingEvent.level.
     * 
     * @deprecated
     */
    public void testLevel() {
	Category root = Logger.getRootLogger();
	Priority info = Level.INFO;
	String catName = Logger.class.toString();
	LoggingEvent event = new LoggingEvent(catName, root, 0L, info, "Hello, world.", null);
	Priority error = Level.ERROR;
	event.level = error;
	assertEquals(Level.ERROR, event.level);
    }

    /**
     * Tests LoggingEvent.getLocationInfo() when no FQCN is specified. See bug
     * 41186.
     */
    public void testLocationInfoNoFQCN() {
	Category root = Logger.getRootLogger();
	Priority level = Level.INFO;
	LoggingEvent event = new LoggingEvent(null, root, 0L, level, "Hello, world.", null);
	LocationInfo info = event.getLocationInformation();
	//
	// log4j 1.2 returns an object, its layout doesn't check for nulls.
	// log4j 1.3 returns a null.
	//
	assertNotNull(info);
	if (info != null) {
	    assertEquals("?", info.getLineNumber());
	    assertEquals("?", info.getClassName());
	    assertEquals("?", info.getFileName());
	    assertEquals("?", info.getMethodName());
	}
    }

    /**
     * Message object that throws a RuntimeException on toString(). See bug 37182.
     */
    private static class BadMessage {
	public BadMessage() {
	}

	public String toString() {
	    throw new RuntimeException();
	}
    }

    /**
     * Tests that an runtime exception or error during toString on the message
     * parameter does not propagate to caller. See bug 37182.
     */
    public void testBadMessage() {
	Category root = Logger.getRootLogger();
	Priority info = Level.INFO;
	String catName = Logger.class.toString();
	BadMessage msg = new BadMessage();
	LoggingEvent event = new LoggingEvent(catName, root, 0L, info, msg, null);
	// would result in exception in earlier versions
	event.getRenderedMessage();
    }

}
