/*
 * Copyright 2007 the original author or authors.
 * 
 * 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.wamblee.io;

import static org.mockito.Mockito.*;
import junit.framework.TestCase;

import org.apache.oro.io.AwkFilenameFilter;

public class DirectoryMonitorTest extends TestCase {

	private static final String REGEX = "^.*\\.txt$";
	private static final String FILE1 = "file1.txt";

	private TestData _data;
	private DirectoryMonitor.Listener _listener;

	private DirectoryMonitor _monitor;

	@Override
	protected void setUp() throws Exception {
		super.setUp();
		_data = new TestData(this);
		_data.clean();
		_listener = mock(DirectoryMonitor.Listener.class);
		_monitor = new DirectoryMonitor(_data.getRoot(), new AwkFilenameFilter(
				REGEX), _listener);
	}

	public void testEmptyDir() {
		// Nothing is expected to be called.
		for (int i = 0; i < 10; i++) {
			_monitor.poll();
			verifyNoMoreInteractions(_listener);
		}
	}

	public void testFileCreated() {
		_data.createFile(FILE1, "hello");
		_monitor.poll();
		verify(_listener).fileCreated(_data.getFile(FILE1));
	}

	public void testFileDeleted() {
		_data.createFile(FILE1, "hello");
		_monitor.poll();
		reset(_listener);

		_data.deleteFile(FILE1);
		_monitor.poll();

		verify(_listener).fileDeleted(_data.getFile(FILE1));
		verifyNoMoreInteractions(_listener);
	}

	public void testFileChanged() throws InterruptedException {
		_data.createFile(FILE1, "hello");
		_monitor.poll();
		reset(_listener);

		Thread.sleep(2000);
		_data.deleteFile(FILE1);
		_data.createFile(FILE1, "bla");

		_monitor.poll();
		verify(_listener).fileChanged(_data.getFile(FILE1));
		verifyNoMoreInteractions(_listener);
	}

	public void testFileFilterIsUsed() {
		_monitor.poll();

		_data.createFile("file.xml", "hello");
		_monitor.poll();
		verifyNoMoreInteractions(_listener);
	}

	public void testDirectoryIsIgnored() {
		_monitor.poll();
		_data.createDir(FILE1);
		_monitor.poll();
		verifyNoMoreInteractions(_listener);
	}

	public void testExceptionsWIllLeadToRepeatedNotifications() { 
		_monitor.poll();
		_data.createFile(FILE1, "hello");
		
		stubVoid(_listener).toThrow(new RuntimeException()).on().
		 fileCreated(_data.getFile(FILE1));
		
		try { 
		    _monitor.poll();
		} catch (RuntimeException e) { 
			reset(_listener); 
			
			// polling again should lead to the same filecreated call.
			// this time no exception is thrown.
			
			_monitor.poll();
			verify(_listener).fileCreated(_data.getFile(FILE1));
			verifyNoMoreInteractions(_listener);
			return; 
		}
		fail(); // should not get here.
		
	
	}
}