package org.wta.util;

import org.junit.Test;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNull;

public class DateUtilsTest {

	@Test
	public void testParseRfc1123DateTime() throws Exception {
		Calendar cal = Calendar.getInstance();
		cal.clear();
		cal.setTimeZone(TimeZone.getTimeZone("GMT"));
		cal.set(Calendar.YEAR, 2015);
		cal.set(Calendar.MONTH, Calendar.JUNE);
		cal.set(Calendar.DATE, 20);
		cal.set(Calendar.HOUR, 2);
		cal.set(Calendar.MINUTE, 37);
		cal.set(Calendar.SECOND, 14);
		Date expected = cal.getTime();

		assertEquals(expected, DateUtils.parseRfc1123DateTime("Sat, 20 Jun 2015 02:37:14 GMT"));

		assertNull(DateUtils.parseRfc1123DateTime("Sat, 20 Jun 2015 02:37:14"));

		assertNull(DateUtils.parseRfc1123DateTime("Sat, 20 Jun 2015"));
	}

	@Test
	public void testFormatRfc1123DateTime() throws Exception {
		Calendar cal = Calendar.getInstance();
		cal.clear();
		cal.setTimeZone(TimeZone.getTimeZone("GMT+1"));
		cal.set(Calendar.YEAR, 2015);
		cal.set(Calendar.MONTH, Calendar.JUNE);
		cal.set(Calendar.DATE, 20);
		cal.set(Calendar.HOUR, 2);
		cal.set(Calendar.MINUTE, 37);
		cal.set(Calendar.SECOND, 14);
		Date date = cal.getTime();

		TimeZone tz = TimeZone.getTimeZone("GMT");
		assertEquals("Sat, 20 Jun 2015 01:37:14 GMT", DateUtils.formatRfc1123DateTime(date, tz));
	}

	@Test
	public void testParseIso8601DateTime() throws Exception {
		Calendar cal = Calendar.getInstance();
		cal.clear();
		cal.setTimeZone(TimeZone.getTimeZone("GMT"));
		cal.set(Calendar.YEAR, 1997);
		cal.set(Calendar.MONTH, Calendar.JULY);
		cal.set(Calendar.DATE, 16);
		cal.set(Calendar.HOUR, 18);
		cal.set(Calendar.MINUTE, 20);
		cal.set(Calendar.SECOND, 30);
		Date expected = cal.getTime();

		// dates without times or time zones are not supported
		assertNull(DateUtils.parseIso8601DateTime("1997"));
		assertNull(DateUtils.parseIso8601DateTime("1997-07"));
		assertNull(DateUtils.parseIso8601DateTime("1997-07-16"));

		// dates without seconds are not supported
		assertNull(DateUtils.parseIso8601DateTime("1997-07-16T19:20+01:00"));

		// dates with fractional seconds containing less that 3 digits are not supported
		assertNull(DateUtils.parseIso8601DateTime("1997-07-16T19:20:30.45+01:00"));

		assertEquals(expected, DateUtils.parseIso8601DateTime("1997-07-16T19:20:30+01:00"));
		assertEquals(expected, DateUtils.parseIso8601DateTime("1997-07-16T18:20:30Z"));

		cal.set(Calendar.MILLISECOND, 235);
		expected = cal.getTime();

		assertEquals(expected, DateUtils.parseIso8601DateTime("1997-07-16T19:20:30.235+01:00"));
		assertEquals(expected, DateUtils.parseIso8601DateTime("1997-07-16T18:20:30.235Z"));
	}

	@Test
	public void testFormatIso8601DateTime() throws Exception {
		Calendar cal = Calendar.getInstance();
		cal.clear();
		cal.setTimeZone(TimeZone.getTimeZone("GMT+1"));
		cal.set(Calendar.YEAR, 1997);
		cal.set(Calendar.MONTH, Calendar.JULY);
		cal.set(Calendar.DATE, 16);
		cal.set(Calendar.HOUR, 19);
		cal.set(Calendar.MINUTE, 20);
		cal.set(Calendar.SECOND, 30);
		Date date = cal.getTime();

		TimeZone tz = TimeZone.getTimeZone("GMT");
		assertEquals("1997-07-16T18:20:30+00:00", DateUtils.formatIso8601DateTime(date, tz));
	}
}