package geniusweb.partiesserver;

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

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

import org.junit.Test;

import geniusweb.partiesserver.repository.AvailableParty;
import tudelft.utilities.files.FileInfo;
import tudelft.utilities.files.FileWatcher;
import tudelft.utilities.immutablelist.Tuple;
import tudelft.utilities.listener.Listenable;
import tudelft.utilities.repository.Repository;

public class AvailablePartiesUpdaterTest {
	private static final String RANDOMPARTY = "src/main/webapp/partiesrepo/randomparty-2.1.1.jar";
	private static final int TESTRATE = 200; // check file changes every 200ms
	@SuppressWarnings("unchecked")
	private Repository<String, AvailableParty> repo = new TestRepo();
	private AvailablePartiesUpdater updater;
	private Path tmpdir;
	private final List<LogRecord> logrecords = new LinkedList<>();
	private Path RNDPARTY;

	private void init() throws IOException {
		tmpdir = Files.createTempDirectory("geniuswebparties");
		RNDPARTY = tmpdir.resolve("randomparty.jar");
		logrecords.clear();
		Logger.getLogger("partiesserver").addHandler(new Handler() {

			@Override
			public void publish(LogRecord record) {
				if (record.getLevel().intValue() >= Level.WARNING.intValue()) {
					logrecords.add(record);
				}
			}

			@Override
			public void flush() {
				// TODO Auto-generated method stub

			}

			@Override
			public void close() throws SecurityException {
				// TODO Auto-generated method stub

			}
		});

		updater = new AvailablePartiesUpdater(repo) {
			@Override
			protected Path getRootDir() {
				return tmpdir;
			}

			@Override
			protected Listenable<Tuple<FileInfo, FileInfo>> getFileWatcher(
					File directory) {
				return new FileWatcher(directory, TESTRATE, 1);
			}
		};
	}

	@Test
	public void smokeTest() throws IOException {
		init();
	}

	@Test
	public void initiallyEmptyTest() throws IOException, InterruptedException {
		init();
		Thread.sleep(2 * TESTRATE);
		assertTrue(repo.list().isEmpty());
		assertTrue(logrecords.isEmpty());
	}

	@Test
	public void IgnoreBadFileTest() throws IOException, InterruptedException {
		init();

		Path file = tmpdir.resolve("file1.txt");
		Files.write(file, Arrays.asList("blah blah"), Charset.forName("UTF-8"));

		Thread.sleep(2 * TESTRATE);
		assertTrue(repo.list().isEmpty());
		assertEquals(1, logrecords.size());
		assertTrue(logrecords.get(0).getMessage()
				.contains("Can not load class from file"));
		assertTrue(logrecords.get(0).getThrown().getMessage()
				.contains("must be a file and have extension .jar"));

	}

	@Test
	public void IgnoreBadJarFileTest()
			throws IOException, InterruptedException {
		init();

		Path file = tmpdir.resolve("file1.jar");
		Files.write(file, Arrays.asList("blah blah"), Charset.forName("UTF-8"));

		Thread.sleep(2 * TESTRATE);
		assertTrue(repo.list().isEmpty());
		assertEquals(1, logrecords.size());
		assertTrue(logrecords.get(0).getMessage()
				.contains("Can not load class from file"));
		// someone changed the error message deep down.
		// assertTrue(logrecords.get(0).getThrown().getMessage().contains("error
		// in opening zip file"));

	}

	@Test
	public void ignoreEmptyJarFileTest()
			throws IOException, InterruptedException {
		init();
		Files.copy(getClass().getResourceAsStream("/empty.jar"),
				tmpdir.resolve("empty.jar"));

		Thread.sleep(2 * TESTRATE);
		assertTrue(repo.list().isEmpty());
		assertEquals(1, logrecords.size());
		assertTrue(logrecords.get(0).getMessage()
				.contains("Can not load class from file"));
		assertTrue(logrecords.get(0).getThrown().getMessage().contains(
				"jar file does not contain manifest with main class"));
	}

	@Test
	public void randomPartyJarTest() throws IOException, InterruptedException {
		init();
		Files.copy(Paths.get(RANDOMPARTY), tmpdir.resolve(RNDPARTY));

		Thread.sleep(2 * TESTRATE);
		assertTrue(logrecords.isEmpty());
		assertEquals(1, repo.list().size());
	}

	@Test
	public void removeJarTest() throws IOException, InterruptedException {
		init();
		Files.copy(Paths.get(RANDOMPARTY), RNDPARTY);
		Thread.sleep(2 * TESTRATE);
		assertEquals(1, repo.list().size());

		Files.delete(RNDPARTY);
		Thread.sleep(2 * TESTRATE);
		assertEquals(0, repo.list().size());
	}

	@Test
	public void removeRootTest() throws IOException, InterruptedException {
		init();
		Files.copy(Paths.get(RANDOMPARTY), RNDPARTY);
		Thread.sleep(2 * TESTRATE);
		assertEquals(1, repo.list().size());

		Files.delete(RNDPARTY);
		Files.delete(tmpdir);
		Thread.sleep(2 * TESTRATE);
		assertEquals(0, repo.list().size());
		assertEquals(1, logrecords.size());
		assertTrue(logrecords.get(0).getMessage()
				.contains("Can not read repository root directory"));

	}

}

/**
 * Basic repo to track what the updater is doing.
 */
class TestRepo implements Repository<String, AvailableParty> {
	private Map<String, AvailableParty> map = new HashMap<String, AvailableParty>();

	@Override
	public Collection<AvailableParty> list() {
		return map.values();
	}

	@Override
	public AvailableParty get(String id) {
		return map.get(id);
	}

	@Override
	public void put(AvailableParty entity) {
		if (map.containsKey(entity.getID())) {
			throw new IllegalStateException("repo already contains entity");
		}
		map.put(entity.getID(), entity);
	}

	@Override
	public void remove(String id) {
		map.remove(id);
	}

	@Override
	public void replace(AvailableParty entity) {
		if (!map.containsKey(entity.getID())) {
			throw new IllegalStateException("repo does not contain entity");
		}
		map.put(entity.getID(), entity);
	}

}