/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.jul;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.testUtil.RandomUtil;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import static org.junit.Assert.assertEquals;

public class LevelChangePropagatorTest {
  int rand = RandomUtil.getPositiveInt();
  LoggerContext loggerContext = new LoggerContext();
  LevelChangePropagator levelChangePropagator = new LevelChangePropagator();

  @Rule
  public ExpectedException exception = ExpectedException.none();

  @Before
  public void setUp() {
    levelChangePropagator.setContext(loggerContext);
    loggerContext.addListener(levelChangePropagator);
  }

  void checkLevelChange(String loggerName, Level level) {
    Logger logger = loggerContext.getLogger(loggerName);
    logger.setLevel(level);
    java.util.logging.Logger julLogger = JULHelper.asJULLogger(logger);
    java.util.logging.Level julLevel = JULHelper.asJULLevel(level);

    assertEquals(julLevel, julLogger.getLevel());
  }

  @Test
  public void smoke() {
    checkLevelChange("a", Level.INFO);
    checkLevelChange("a.b", Level.DEBUG);
  }

  @Test
  public void root() {
    checkLevelChange(Logger.ROOT_LOGGER_NAME, Level.TRACE);
  }

  // see http://jira.qos.ch/browse/LBCLASSIC-256
  @Test
  public void gc() {
    Logger logger = loggerContext.getLogger("gc"+rand);
    logger.setLevel(Level.INFO);
    // invoke GC so that the relevant julLogger can be garbage collected.
    System.gc();
    java.util.logging.Logger julLogger = JULHelper.asJULLogger(logger);
    java.util.logging.Level julLevel = JULHelper.asJULLevel(Level.INFO);

    assertEquals(julLevel, julLogger.getLevel());
 }

  @Test
  public void julHelperAsJulLevelRejectsNull() {
    exception.expect(IllegalArgumentException.class);
    exception.expectMessage("Unexpected level [null]");
    JULHelper.asJULLevel(null);
  }

  @Test
  public void settingLevelToNullGetsParentLevel() {
    // first set level of "a" (the parent) to DEBUG
    Logger parent = loggerContext.getLogger("a");
    parent.setLevel(Level.DEBUG);

    // then set level of "a.b" (child logger of a) to null
    // for b to inherit its parent's level
    Logger child = loggerContext.getLogger("a.b");
    child.setLevel(Level.INFO);
    child.setLevel(null);

    assertEquals(parent.getEffectiveLevel(), child.getEffectiveLevel());
    assertEquals(Level.DEBUG, child.getEffectiveLevel());
  }
}
