package io.github.steveswinsburg;

import static org.junit.Assert.assertEquals;

import java.sql.Date;
import java.sql.Timestamp;
import java.time.ZoneOffset;
import java.util.Calendar;
import java.util.TimeZone;

import org.junit.Test;

import ca.uhn.fhir.model.api.TemporalPrecisionEnum;
import ca.uhn.fhir.model.primitive.DateTimeDt;

/**
 * Some tests for  {@link DateTimeDt} to help me troubleshoot a timezone issue
 */
public class DateTimeDtTest {

	/**
	 * Ensure that a string version of an offset can be mapped
	 */
	@Test
	public void testOffset() {

		ZoneOffset offset = ZoneOffset.of("-0300");

		assertEquals("Didn't map offset correctly", "-03:00", offset.getId());
	}

	/**
	 * Ensure that a string version of an offset can be mapped into a timezone
	 */
	@Test
	public void testTimezoneFromOffset() {

		ZoneOffset offset = ZoneOffset.of("-0300");
		TimeZone timezone = TimeZone.getTimeZone(offset);

		assertEquals("Didn't map timezone correctly", "GMT-03:00", timezone.getDisplayName());
	}

	/**
	 * A {@link DateTimeDt} created with the basic constructor uses the default timezone
	 */
	@Test
	public void testDateInDefaultTimezone() {

		Date date = new Date();
		TimeZone timezone = TimeZone.getDefault();
		DateTimeDt fhirDate = new DateTimeDt(date);

		assertEquals("Timezone expected was not default", timezone, fhirDate.getTimeZone());
	}

	/**
	 * A {@link DateTimeDt} created with the full constructor should use the provided timezone
	 */
	@Test
	public void testDateInProvidedTimezone() {

		Date date = new Date();
		TimeZone timezone = TimeZone.getTimeZone("America/Los_Angeles");
		DateTimeDt fhirDate = new DateTimeDt(date, TemporalPrecisionEnum.SECOND, timezone);

		assertEquals("Timezone was not as expected", timezone, fhirDate.getTimeZone());
	}

	/**
	 * A {@link DateTimeDt} created with the full constructor and a timezone created from a string offset, should use the provided timezone and map it across correctly
	 */
	@Test
	public void testDateInProvidedTimezoneFromOffset() {

		Date date = new Date();

		ZoneOffset offset = ZoneOffset.of("-0300");
		TimeZone timezone = TimeZone.getTimeZone(offset);
		DateTimeDt fhirDate = new DateTimeDt(date, TemporalPrecisionEnum.SECOND, timezone);

		assertEquals("Timezone was not as expected", timezone, fhirDate.getTimeZone());
	}

	/**
	 * A {@link DateTimeDt} created with the full constructor using a timestamp instead of a date, and a timezone created from a string offset, should use the provided timezone and map it across correctly
	 */
	@Test
	public void testDateInProvidedTimezoneFromTimestamp() {

		Timestamp timestamp = new Timestamp();

		ZoneOffset offset = ZoneOffset.of("-0300");
		TimeZone timezone = TimeZone.getTimeZone(offset);
		DateTimeDt fhirDate = new DateTimeDt(timestamp, TemporalPrecisionEnum.SECOND, timezone);

		assertEquals("Timezone was not as expected", timezone, fhirDate.getTimeZone());
	}

}