/*
 * $Id$
 *
 * Copyright (c) 2010 by Joel Uckelman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License (LGPL) as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, copies are available
 * at http://www.opensource.org.
 */

package VASSAL.tools.io;

import VASSAL.tools.concurrent.listener.EventListener;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.junit.Test;

import static org.junit.Assert.*;

public class TailerTest {

  private static String exists    = "test/VASSAL/tools/io/TailerTest.java";
  private static String notexists = "test/VASSAL/tools/io/notexists";

  @Test
  public void testGetFile() {
    final File file = new File(exists);
    final Tailer tailer = new Tailer(file);
    assertEquals(file, tailer.getFile());
  }

  @Test
  public void testIsTailingTrue() throws IOException {
    final File file = new File(exists);
    final Tailer tailer = new Tailer(file);
    tailer.start();
    assertTrue(tailer.isTailing());
    tailer.stop();
  }

  @Test
  public void testIsTailingFalse() {
    final File file = new File(exists);
    final Tailer tailer = new Tailer(file);
    assertFalse(tailer.isTailing());
  }

  @Test(expected=IOException.class)
  public void testNoFile() throws IOException {
    final File file = new File(notexists);
    final Tailer tailer = new Tailer(file);
    tailer.start();
  }

  @Test(expected=IOException.class)
  public void testDirectory() throws IOException {
    final File file = new File(".");
    final Tailer tailer = new Tailer(file);
    tailer.start();
  }

  @Test
  public void testTailer() throws InterruptedException, IOException {
    final File file = new File(exists);

    final StringBuilder sb_tailer = new StringBuilder();

    final Tailer tailer = new Tailer(file);
    tailer.addEventListener(new EventListener<String>() {
      public void receive(Object src, String str) {
        sb_tailer.append(str);
      }
    });
    tailer.start();

    // give the Tailer time to work
    Thread.sleep(1000L);

    tailer.stop();

    final String actual = sb_tailer.toString();

    String expected = null;
    FileInputStream in = null;
    try {
      in = new FileInputStream(file);
      expected = IOUtils.toString(in).substring(0, actual.length());
    }
    finally {
      IOUtils.closeQuietly(in);
    }

    // compare whatever the Tailer had time to read
    assertEquals(expected, actual);
  }
}