/**
 * This file is Copyright © 2008 Software Craftsmen Limited. All Rights Reserved.
 */
package com.softwarecraftsmen.dns;

import static com.softwarecraftsmen.dns.names.HostName.hostName;
import static com.softwarecraftsmen.dns.MailExchange.mailExchange;
import static com.softwarecraftsmen.unsignedIntegers.Unsigned16BitInteger.unsigned16BitInteger;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.assertThat;
import org.junit.Test;

public class MailExchangeTest
{
	@Test
	public void comparesUsingPreferencesFirstAndLowerPreferenceWins()
	{
		final MailExchange lowerPreference = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		final MailExchange higherPreference = mailExchange(unsigned16BitInteger(20), hostName("mail.google.com"));
		assertThat(lowerPreference, lessThan(higherPreference));
		assertThat(higherPreference, greaterThan(lowerPreference));
	}

	@Test
	public void comparesUsingPreferencesFirstThenHostNamesAndEqualHostNamesAreEqual()
	{
		final MailExchange identicalPreference1 = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		final MailExchange identicalPreference2 = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		final int operand = identicalPreference1.compareTo(identicalPreference2);
		assertThat(0, equalTo(operand));
	}

	@Test
	public void comparesUsingPreferencesFirstThenHostNamesAndHostNamesWithLessLabelsAreFirst()
	{
		final MailExchange shorterHostName = mailExchange(unsigned16BitInteger(10), hostName("squid.com"));
		final MailExchange longerHostName = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		assertThat(shorterHostName, lessThan(longerHostName));
		assertThat(longerHostName, greaterThan(shorterHostName));
	}

	@Test
	public void comparesUsingPreferencesFirstThenHostNamesAndHostNamesWithSameLabelsAreFirst()
	{
		final MailExchange shorterHostName = mailExchange(unsigned16BitInteger(10), hostName("first.google.com"));
		final MailExchange longerHostName = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		assertThat(shorterHostName, lessThan(longerHostName));
		assertThat(longerHostName, greaterThan(shorterHostName));
	}

	@Test
	public void comparesUsingPreferencesFirstThenHostNamesAndHostNamesWithSameLabelsAreFirstCheckReversesCorrectly()
	{
		final MailExchange shorterHostName = mailExchange(unsigned16BitInteger(10), hostName("mail.google.com"));
		final MailExchange longerHostName = mailExchange(unsigned16BitInteger(10), hostName("mail.google.org"));
		assertThat(shorterHostName, lessThan(longerHostName));
		assertThat(longerHostName, greaterThan(shorterHostName));
	}
}