/*
 * Copyright (c) 2004, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package org.postgresql.localtimedate;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import org.postgresql.core.ServerVersion;
import org.postgresql.util.PSQLException;
import org.postgresql.util.PSQLState;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.chrono.IsoEra;
import java.time.temporal.ChronoField;
import java.time.temporal.Temporal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.TimeZone;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import java.util.stream.Stream;

@RunWith(Parameterized.class)
public class GetObject310Test extends BaseTest4 {

  private static final TimeZone saveTZ = TimeZone.getDefault();

  private static final ZoneOffset UTC = ZoneOffset.UTC; // +0000 always
  private static final ZoneOffset GMT03 = ZoneOffset.of("+03:00"); // +0300 always
  private static final ZoneOffset GMT05 = ZoneOffset.of("-05:00"); // -0500 always
  private static final ZoneOffset GMT13 = ZoneOffset.of("+13:00"); // +1300 always

  public GetObject310Test(BinaryMode binaryMode) {
    setBinaryMode(binaryMode);
  }

  @Parameterized.Parameters(name = "binary = {0}")
  public static Iterable<Object[]> data() {
    Collection<Object[]> ids = new ArrayList<Object[]>();
    for (BinaryMode binaryMode : BinaryMode.values()) {
      ids.add(new Object[]{binaryMode});
    }
    return ids;
  }

  @Override
  public void setUp() throws Exception {
    super.setUp();
    TestUtil.createTable(con, "table1", "timestamp_without_time_zone_column timestamp without time zone,"
            + "timestamp_with_time_zone_column timestamp with time zone,"
            + "date_column date,"
            + "time_without_time_zone_column time without time zone,"
            + "time_with_time_zone_column time with time zone"
    );
  }

  @Override
  public void tearDown() throws SQLException {
    TimeZone.setDefault(saveTZ);
    TestUtil.dropTable(con, "table1");
    super.tearDown();
  }

  /**
   * Test the behavior getObject for date columns.
   */
  @Test
  public void testGetLocalDate() throws SQLException {
    Statement stmt = con.createStatement();
    stmt.executeUpdate(TestUtil.insertSQL("table1","date_column","DATE '1999-01-08'"));

    ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "date_column"));
    try {
      assertTrue(rs.next());
      LocalDate localDate = LocalDate.of(1999, 1, 8);
      assertEquals(localDate, rs.getObject("date_column", LocalDate.class));
      assertEquals(localDate, rs.getObject(1, LocalDate.class));
    } finally {
      rs.close();
    }
  }

  /**
   * Test the behavior getObject for time columns.
   */
  @Test
  public void testGetLocalTime() throws SQLException {
    Statement stmt = con.createStatement();
    stmt.executeUpdate(TestUtil.insertSQL("table1","time_without_time_zone_column","TIME '04:05:06.123456'"));

    ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "time_without_time_zone_column"));
    try {
      assertTrue(rs.next());
      LocalTime localTime = LocalTime.of(4, 5, 6, 123456000);
      assertEquals(localTime, rs.getObject("time_without_time_zone_column", LocalTime.class));
      assertEquals(localTime, rs.getObject(1, LocalTime.class));
    } finally {
      rs.close();
    }
  }

  /**
   * Test the behavior getObject for time columns with null.
   */
  @Test
  public void testGetLocalTimeNull() throws SQLException {
    Statement stmt = con.createStatement();
    stmt.executeUpdate(TestUtil.insertSQL("table1","time_without_time_zone_column","NULL"));

    ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "time_without_time_zone_column"));
    try {
      assertTrue(rs.next());
      assertNull(rs.getObject("time_without_time_zone_column", LocalTime.class));
      assertNull(rs.getObject(1, LocalTime.class));
    } finally {
      rs.close();
    }
  }

  /**
   * Test the behavior getObject for time columns with null.
   */
  @Test
  public void testGetLocalTimeInvalidType() throws SQLException {
    Statement stmt = con.createStatement();
    stmt.executeUpdate(TestUtil.insertSQL("table1","time_with_time_zone_column", "TIME '04:05:06.123456-08:00'"));

    ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "time_with_time_zone_column"));
    try {
      assertTrue(rs.next());
      try {
        assertNull(rs.getObject("time_with_time_zone_column", LocalTime.class));
      } catch (PSQLException e) {
        assertTrue(e.getSQLState().equals(PSQLState.DATA_TYPE_MISMATCH.getState())
                || e.getSQLState().equals(PSQLState.BAD_DATETIME_FORMAT.getState()));
      }
      try {
        assertNull(rs.getObject(1, LocalTime.class));
      } catch (PSQLException e) {
        assertTrue(e.getSQLState().equals(PSQLState.DATA_TYPE_MISMATCH.getState())
                || e.getSQLState().equals(PSQLState.BAD_DATETIME_FORMAT.getState()));
      }
    } finally {
      rs.close();
    }
  }

  /**
   * Test the behavior getObject for timestamp columns.
   */
  @Test
  public void testGetLocalDateTime() throws SQLException {
    assumeTrue(TestUtil.haveIntegerDateTimes(con));

    List<String> zoneIdsToTest = new ArrayList<String>();
    zoneIdsToTest.add("Africa/Casablanca"); // It is something like GMT+0..GMT+1
    zoneIdsToTest.add("America/Adak"); // It is something like GMT-10..GMT-9
    zoneIdsToTest.add("Atlantic/Azores"); // It is something like GMT-1..GMT+0
    zoneIdsToTest.add("Europe/Moscow"); // It is something like GMT+3..GMT+4 for 2000s
    zoneIdsToTest.add("Pacific/Apia"); // It is something like GMT+13..GMT+14
    zoneIdsToTest.add("Pacific/Niue"); // It is something like GMT-11..GMT-11
    for (int i = -12; i <= 13; i++) {
      zoneIdsToTest.add(String.format("GMT%+02d", i));
    }

    List<String> datesToTest = Arrays.asList("2015-09-03T12:00:00", "2015-06-30T23:59:58",
            "1997-06-30T23:59:59", "1997-07-01T00:00:00", "2012-06-30T23:59:59", "2012-07-01T00:00:00",
            "2015-06-30T23:59:59", "2015-07-01T00:00:00", "2005-12-31T23:59:59", "2006-01-01T00:00:00",
            "2008-12-31T23:59:59", "2009-01-01T00:00:00", /* "2015-06-30T23:59:60", */ "2015-07-31T00:00:00",
            "2015-07-31T00:00:01", "2015-07-31T00:00:00.000001",

            // On 2000-03-26 02:00:00 Moscow went to DST, thus local time became 03:00:00
            "2000-03-26T01:59:59", "2000-03-26T02:00:00", "2000-03-26T02:00:01", "2000-03-26T02:59:59",
            "2000-03-26T03:00:00", "2000-03-26T03:00:01", "2000-03-26T03:59:59", "2000-03-26T04:00:00",
            "2000-03-26T04:00:01", "2000-03-26T04:00:00.000001",

            // This is a pre-1970 date, so check if it is rounded properly
            "1950-07-20T02:00:00",

            // Ensure the calendar is proleptic
            "1582-09-30T00:00:00", "1582-10-16T00:00:00",

            // On 2000-10-29 03:00:00 Moscow went to regular time, thus local time became 02:00:00
            "2000-10-29T01:59:59", "2000-10-29T02:00:00", "2000-10-29T02:00:01", "2000-10-29T02:59:59",
            "2000-10-29T03:00:00", "2000-10-29T03:00:01", "2000-10-29T03:59:59", "2000-10-29T04:00:00",
            "2000-10-29T04:00:01", "2000-10-29T04:00:00.000001");

    for (String zoneId : zoneIdsToTest) {
      ZoneId zone = ZoneId.of(zoneId);
      for (String date : datesToTest) {
        localTimestamps(zone, date);
      }
    }
  }

  public void localTimestamps(ZoneId zoneId, String timestamp) throws SQLException {
    TimeZone.setDefault(TimeZone.getTimeZone(zoneId));
    Statement stmt = con.createStatement();
    try {
      stmt.executeUpdate(TestUtil.insertSQL("table1","timestamp_without_time_zone_column","TIMESTAMP '" + timestamp + "'"));

      ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "timestamp_without_time_zone_column"));
      try {
        assertTrue(rs.next());
        LocalDateTime localDateTime = LocalDateTime.parse(timestamp);
        assertEquals(localDateTime, rs.getObject("timestamp_without_time_zone_column", LocalDateTime.class));
        assertEquals(localDateTime, rs.getObject(1, LocalDateTime.class));

        //Also test that we get the correct values when retrieving the data as LocalDate objects
        assertEquals(localDateTime.toLocalDate(), rs.getObject("timestamp_without_time_zone_column", LocalDate.class));
        assertEquals(localDateTime.toLocalDate(), rs.getObject(1, LocalDate.class));
      } finally {
        rs.close();
      }
      stmt.executeUpdate("DELETE FROM table1");
    } finally {
      stmt.close();
    }
  }

  /**
   * Test the behavior getObject for timestamp with time zone columns.
   */
  @Test
  public void testGetTimestampWithTimeZone() throws SQLException {
    runGetOffsetDateTime(UTC);
    runGetOffsetDateTime(GMT03);
    runGetOffsetDateTime(GMT05);
    runGetOffsetDateTime(GMT13);
  }

  private void runGetOffsetDateTime(ZoneOffset offset) throws SQLException {
    Statement stmt = con.createStatement();
    try {
      stmt.executeUpdate(TestUtil.insertSQL("table1","timestamp_with_time_zone_column","TIMESTAMP WITH TIME ZONE '2004-10-19 10:23:54.123456" + offset.toString() + "'"));

      ResultSet rs = stmt.executeQuery(TestUtil.selectSQL("table1", "timestamp_with_time_zone_column"));
      try {
        assertTrue(rs.next());
        LocalDateTime localDateTime = LocalDateTime.of(2004, 10, 19, 10, 23, 54, 123456000);

        OffsetDateTime offsetDateTime = localDateTime.atOffset(offset).withOffsetSameInstant(ZoneOffset.UTC);
        assertEquals(offsetDateTime, rs.getObject("timestamp_with_time_zone_column", OffsetDateTime.class));
        assertEquals(offsetDateTime, rs.getObject(1, OffsetDateTime.class));
      } finally {
        rs.close();
      }
      stmt.executeUpdate("DELETE FROM table1");
    } finally {
      stmt.close();
    }
  }

  @Test
  public void testBcTimestamp() throws SQLException {

    Statement stmt = con.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT '1582-09-30 12:34:56 BC'::timestamp");
    try {
      assertTrue(rs.next());
      LocalDateTime expected = LocalDateTime.of(1582, 9, 30, 12, 34, 56)
          .with(ChronoField.ERA, IsoEra.BCE.getValue());
      LocalDateTime actual = rs.getObject(1, LocalDateTime.class);
      assertEquals(expected, actual);
      assertFalse(rs.next());
    } finally {
      rs.close();
      stmt.close();
    }
  }

  @Test
  public void testBcTimestamptz() throws SQLException {

    Statement stmt = con.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT '1582-09-30 12:34:56Z BC'::timestamp");
    try {
      assertTrue(rs.next());
      OffsetDateTime expected = OffsetDateTime.of(1582, 9, 30, 12, 34, 56, 0, UTC)
          .with(ChronoField.ERA, IsoEra.BCE.getValue());
      OffsetDateTime actual = rs.getObject(1, OffsetDateTime.class);
      assertEquals(expected, actual);
      assertFalse(rs.next());
    } finally {
      rs.close();
      stmt.close();
    }
  }

  @Test
  public void testProlepticCalendarTimestamp() throws SQLException {
    // date time ranges and CTEs are both new with 8.4
    assumeMinimumServerVersion(ServerVersion.v8_4);
    LocalDateTime start = LocalDate.of(1582, 9, 30).atStartOfDay();
    LocalDateTime end = LocalDate.of(1582, 10, 16).atStartOfDay();
    long numberOfDays = Duration.between(start, end).toDays() + 1L;
    List<LocalDateTime> range = Stream.iterate(start, new LocalDateTimePlusOneDay())
        .limit(numberOfDays)
        .collect(Collectors.toList());

    runProlepticTests(LocalDateTime.class, "'1582-09-30 00:00'::timestamp, '1582-10-16 00:00'::timestamp", range);
  }

  @Test
  public void testProlepticCalendarTimestamptz() throws SQLException {
    // date time ranges and CTEs are both new with 8.4
    assumeMinimumServerVersion(ServerVersion.v8_4);
    OffsetDateTime start = LocalDate.of(1582, 9, 30).atStartOfDay().atOffset(UTC);
    OffsetDateTime end = LocalDate.of(1582, 10, 16).atStartOfDay().atOffset(UTC);
    long numberOfDays = Duration.between(start, end).toDays() + 1L;
    List<OffsetDateTime> range = Stream.iterate(start, new OffsetDateTimePlusOneDay())
        .limit(numberOfDays)
        .collect(Collectors.toList());

    runProlepticTests(OffsetDateTime.class, "'1582-09-30 00:00:00 Z'::timestamptz, '1582-10-16 00:00:00 Z'::timestamptz", range);
  }

  private <T extends Temporal> void runProlepticTests(Class<T> clazz, String selectRange, List<T> range) throws SQLException {
    List<T> temporals = new ArrayList<>(range.size());

    PreparedStatement stmt = con.prepareStatement("SELECT * FROM generate_series(" + selectRange + ", '1 day');");
    ResultSet rs = stmt.executeQuery();
    try {
      while (rs.next()) {
        T temporal = rs.getObject(1, clazz);
        temporals.add(temporal);
      }
      assertEquals(range, temporals);
    } finally {
      rs.close();
      stmt.close();
    }
  }

  private static class LocalDateTimePlusOneDay implements UnaryOperator<LocalDateTime> {

    @Override
    public LocalDateTime apply(LocalDateTime x) {
      return x.plusDays(1);
    }
  }

  private static class OffsetDateTimePlusOneDay implements UnaryOperator<OffsetDateTime> {

    @Override
    public OffsetDateTime apply(OffsetDateTime x) {
      return x.plusDays(1);
    }
  }

}
