/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.document;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

import org.apache.lucene.util.LuceneTestCase;

public class TestDateTools extends LuceneTestCase {
  public void testStringToDate() throws ParseException {
    
    Date d = null;
    d = DateTools.stringToDate("2004");
    assertEquals("2004-01-01 00:00:00:000", isoFormat(d));
    d = DateTools.stringToDate("20040705");
    assertEquals("2004-07-05 00:00:00:000", isoFormat(d));
    d = DateTools.stringToDate("200407050910");
    assertEquals("2004-07-05 09:10:00:000", isoFormat(d));
    d = DateTools.stringToDate("20040705091055990");
    assertEquals("2004-07-05 09:10:55:990", isoFormat(d));

    expectThrows(ParseException.class, () -> {
      DateTools.stringToDate("97");    // no date
    });

    expectThrows(ParseException.class, () -> {
      DateTools.stringToDate("200401011235009999");    // no date
    });

    expectThrows(ParseException.class, () -> {
      DateTools.stringToDate("aaaa");    // no date
    });
  }
  
  public void testStringtoTime() throws ParseException {
    long time = DateTools.stringToTime("197001010000");
    // we use default locale since LuceneTestCase randomizes it
    Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"), Locale.getDefault());
    cal.clear();
    cal.set(1970, 0, 1,    // year=1970, month=january, day=1
        0, 0, 0);          // hour, minute, second
    cal.set(Calendar.MILLISECOND, 0);
    assertEquals(cal.getTime().getTime(), time);
    cal.set(1980, 1, 2,    // year=1980, month=february, day=2
        11, 5, 0);          // hour, minute, second
    cal.set(Calendar.MILLISECOND, 0);
    time = DateTools.stringToTime("198002021105");
    assertEquals(cal.getTime().getTime(), time);
  }
  
  public void testDateAndTimetoString() throws ParseException {
    // we use default locale since LuceneTestCase randomizes it
    Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"), Locale.getDefault());
    cal.clear();
    cal.set(2004, 1, 3,   // year=2004, month=february(!), day=3
        22, 8, 56);       // hour, minute, second
    cal.set(Calendar.MILLISECOND, 333);
    
    String dateString;
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.YEAR);
    assertEquals("2004", dateString);
    assertEquals("2004-01-01 00:00:00:000", isoFormat(DateTools.stringToDate(dateString)));
    
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.MONTH);
    assertEquals("200402", dateString);
    assertEquals("2004-02-01 00:00:00:000", isoFormat(DateTools.stringToDate(dateString)));

    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.DAY);
    assertEquals("20040203", dateString);
    assertEquals("2004-02-03 00:00:00:000", isoFormat(DateTools.stringToDate(dateString)));
    
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.HOUR);
    assertEquals("2004020322", dateString);
    assertEquals("2004-02-03 22:00:00:000", isoFormat(DateTools.stringToDate(dateString)));
    
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.MINUTE);
    assertEquals("200402032208", dateString);
    assertEquals("2004-02-03 22:08:00:000", isoFormat(DateTools.stringToDate(dateString)));
    
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.SECOND);
    assertEquals("20040203220856", dateString);
    assertEquals("2004-02-03 22:08:56:000", isoFormat(DateTools.stringToDate(dateString)));
    
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.MILLISECOND);
    assertEquals("20040203220856333", dateString);
    assertEquals("2004-02-03 22:08:56:333", isoFormat(DateTools.stringToDate(dateString)));

    // date before 1970:
    cal.set(1961, 2, 5,   // year=1961, month=march(!), day=5
        23, 9, 51);       // hour, minute, second
    cal.set(Calendar.MILLISECOND, 444);
    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.MILLISECOND);
    assertEquals("19610305230951444", dateString);
    assertEquals("1961-03-05 23:09:51:444", isoFormat(DateTools.stringToDate(dateString)));

    dateString = DateTools.dateToString(cal.getTime(), DateTools.Resolution.HOUR);
    assertEquals("1961030523", dateString);
    assertEquals("1961-03-05 23:00:00:000", isoFormat(DateTools.stringToDate(dateString)));

    // timeToString:
    cal.set(1970, 0, 1, // year=1970, month=january, day=1
        0, 0, 0); // hour, minute, second
    cal.set(Calendar.MILLISECOND, 0);
    dateString = DateTools.timeToString(cal.getTime().getTime(),
        DateTools.Resolution.MILLISECOND);
    assertEquals("19700101000000000", dateString);
        
    cal.set(1970, 0, 1, // year=1970, month=january, day=1
        1, 2, 3); // hour, minute, second
    cal.set(Calendar.MILLISECOND, 0);
    dateString = DateTools.timeToString(cal.getTime().getTime(),
        DateTools.Resolution.MILLISECOND);
    assertEquals("19700101010203000", dateString);
  }
  
  public void testRound() {
    // we use default locale since LuceneTestCase randomizes it
    Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"), Locale.getDefault());
    cal.clear();
    cal.set(2004, 1, 3,   // year=2004, month=february(!), day=3
        22, 8, 56);       // hour, minute, second
    cal.set(Calendar.MILLISECOND, 333);
    Date date = cal.getTime();
    assertEquals("2004-02-03 22:08:56:333", isoFormat(date));

    Date dateYear = DateTools.round(date, DateTools.Resolution.YEAR);
    assertEquals("2004-01-01 00:00:00:000", isoFormat(dateYear));

    Date dateMonth = DateTools.round(date, DateTools.Resolution.MONTH);
    assertEquals("2004-02-01 00:00:00:000", isoFormat(dateMonth));

    Date dateDay = DateTools.round(date, DateTools.Resolution.DAY);
    assertEquals("2004-02-03 00:00:00:000", isoFormat(dateDay));

    Date dateHour = DateTools.round(date, DateTools.Resolution.HOUR);
    assertEquals("2004-02-03 22:00:00:000", isoFormat(dateHour));

    Date dateMinute = DateTools.round(date, DateTools.Resolution.MINUTE);
    assertEquals("2004-02-03 22:08:00:000", isoFormat(dateMinute));

    Date dateSecond = DateTools.round(date, DateTools.Resolution.SECOND);
    assertEquals("2004-02-03 22:08:56:000", isoFormat(dateSecond));

    Date dateMillisecond = DateTools.round(date, DateTools.Resolution.MILLISECOND);
    assertEquals("2004-02-03 22:08:56:333", isoFormat(dateMillisecond));

    // long parameter:
    long dateYearLong = DateTools.round(date.getTime(), DateTools.Resolution.YEAR);
    assertEquals("2004-01-01 00:00:00:000", isoFormat(new Date(dateYearLong)));

    long dateMillisecondLong = DateTools.round(date.getTime(), DateTools.Resolution.MILLISECOND);
    assertEquals("2004-02-03 22:08:56:333", isoFormat(new Date(dateMillisecondLong)));
  }

  private String isoFormat(Date date) {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS", Locale.ROOT);
    sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
    return sdf.format(date);
  }

  public void testDateToolsUTC() throws Exception {
    // Sun, 30 Oct 2005 00:00:00 +0000 -- the last second of 2005's DST in Europe/London
    long time = 1130630400;
    try {
        TimeZone.setDefault(TimeZone.getTimeZone(/* "GMT" */ "Europe/London"));
        String d1 = DateTools.dateToString(new Date(time*1000), DateTools.Resolution.MINUTE);
        String d2 = DateTools.dateToString(new Date((time+3600)*1000), DateTools.Resolution.MINUTE);
        assertFalse("different times", d1.equals(d2));
        assertEquals("midnight", DateTools.stringToTime(d1), time*1000);
        assertEquals("later", DateTools.stringToTime(d2), (time+3600)*1000);
    } finally {
        TimeZone.setDefault(null);
    }
  }

}
