/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.values.storable;

import static java.time.ZoneOffset.UTC;
import static java.time.ZoneOffset.ofHours;
import static java.util.Collections.singletonList;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.neo4j.values.storable.TimeValue.parse;
import static org.neo4j.values.storable.TimeValue.time;
import static org.neo4j.values.utils.AnyValueTestUtil.assertEqual;
import static org.neo4j.values.utils.AnyValueTestUtil.assertNotEqual;

import java.time.OffsetTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import org.junit.jupiter.api.Test;
import org.neo4j.exceptions.TemporalParseException;

class TimeValueTest {
    static final Supplier<ZoneId> inUTC = () -> UTC;
    static final Supplier<ZoneId> orFail = () -> {
        throw new AssertionError("should not request timezone");
    };

    @Test
    void shouldParseTimeWithOnlyHour() {
        assertEquals(time(14, 0, 0, 0, UTC), parse("14", inUTC));
        assertEquals(time(4, 0, 0, 0, UTC), parse("4", inUTC));
        assertEquals(time(4, 0, 0, 0, UTC), parse("04", inUTC));
    }

    @Test
    void shouldParseTimeWithHourAndMinute() {
        assertEquals(time(14, 5, 0, 0, UTC), parse("1405", inUTC));
        assertEquals(time(14, 5, 0, 0, UTC), parse("14:5", inUTC));
        assertEquals(time(4, 15, 0, 0, UTC), parse("4:15", inUTC));
        assertEquals(time(9, 7, 0, 0, UTC), parse("9:7", inUTC));
        assertEquals(time(3, 4, 0, 0, UTC), parse("03:04", inUTC));
    }

    @Test
    void shouldParseTimeWithHourMinuteAndSecond() {
        assertEquals(time(14, 5, 17, 0, UTC), parse("140517", inUTC));
        assertEquals(time(14, 5, 17, 0, UTC), parse("14:5:17", inUTC));
        assertEquals(time(4, 15, 4, 0, UTC), parse("4:15:4", inUTC));
        assertEquals(time(9, 7, 19, 0, UTC), parse("9:7:19", inUTC));
        assertEquals(time(3, 4, 1, 0, UTC), parse("03:04:01", inUTC));
    }

    @Test
    void shouldParseTimeWithHourMinuteSecondAndFractions() {
        assertEquals(time(14, 5, 17, 123000000, UTC), parse("140517.123", inUTC));
        assertEquals(time(14, 5, 17, 1, UTC), parse("14:5:17.000000001", inUTC));
        assertEquals(time(4, 15, 4, 0, UTC), parse("4:15:4.000", inUTC));
        assertEquals(time(9, 7, 19, 999999999, UTC), parse("9:7:19.999999999", inUTC));
        assertEquals(time(3, 4, 1, 123456789, UTC), parse("03:04:01.123456789", inUTC));

        assertEquals(time(14, 5, 17, 123000000, UTC), parse("140517,123", inUTC));
        assertEquals(time(14, 5, 17, 1, UTC), parse("14:5:17,000000001", inUTC));
        assertEquals(time(4, 15, 4, 0, UTC), parse("4:15:4,000", inUTC));
        assertEquals(time(9, 7, 19, 999999999, UTC), parse("9:7:19,999999999", inUTC));
        assertEquals(time(3, 4, 1, 123456789, UTC), parse("03:04:01,123456789", inUTC));
    }

    @Test
    @SuppressWarnings("ThrowableNotThrown")
    void shouldFailToParseTimeOutOfRange() {
        assertThrows(TemporalParseException.class, () -> parse("24", inUTC));
        assertThrows(TemporalParseException.class, () -> parse("1760", inUTC));
        assertThrows(TemporalParseException.class, () -> parse("173260", inUTC));
        assertThrows(TemporalParseException.class, () -> parse("173250.0000000001", inUTC));
    }

    @Test
    void shouldWriteTime() {
        // given
        for (TimeValue time : new TimeValue[] {
            time(11, 30, 4, 112233440, ofHours(3)),
            time(23, 59, 59, 999999999, ofHours(18)),
            time(23, 59, 59, 999999999, ofHours(-18)),
            time(0, 0, 0, 0, ofHours(-18)),
            time(0, 0, 0, 0, ofHours(18)),
        }) {
            List<TimeValue> values = new ArrayList<>(1);
            ValueWriter<RuntimeException> writer = new ThrowingValueWriter.AssertOnly() {
                @Override
                public void writeTime(OffsetTime offsetTime) {
                    values.add(time(offsetTime));
                }
            };

            // when
            time.writeTo(writer);

            // then
            assertEquals(singletonList(time), values);
        }
    }

    @Test
    void shouldAddDurationToTimes() {
        assertEquals(time(12, 15, 0, 0, UTC), time(12, 0, 0, 0, UTC).add(DurationValue.duration(1, 1, 900, 0)));
        assertEquals(
                time(12, 0, 2, 0, UTC), time(12, 0, 0, 0, UTC).add(DurationValue.duration(0, 0, 1, 1_000_000_000)));
        assertEquals(
                time(12, 0, 0, 0, UTC), time(12, 0, 0, 0, UTC).add(DurationValue.duration(0, 0, 1, -1_000_000_000)));
    }

    @Test
    void shouldReuseInstanceInArithmetics() {
        final TimeValue noon = time(12, 0, 0, 0, UTC);
        assertSame(noon, noon.add(DurationValue.duration(0, 0, 0, 0)));
        assertSame(noon, noon.add(DurationValue.duration(1, 1, 0, 0)));
        assertSame(noon, noon.add(DurationValue.duration(-1, 1, 0, -0)));
    }

    @Test
    void shouldSubtractDurationFromTimes() {
        assertEquals(time(12, 0, 0, 0, UTC), time(12, 15, 0, 0, UTC).sub(DurationValue.duration(1, 1, 900, 0)));
        assertEquals(
                time(12, 0, 0, 0, UTC), time(12, 0, 2, 0, UTC).sub(DurationValue.duration(0, 0, 1, 1_000_000_000)));
        assertEquals(
                time(12, 0, 0, 0, UTC), time(12, 0, 0, 0, UTC).sub(DurationValue.duration(0, 0, 1, -1_000_000_000)));
    }

    @Test
    void shouldEqualItself() {
        assertEqual(time(10, 52, 5, 6, UTC), time(10, 52, 5, 6, UTC));
    }

    @Test
    void shouldNotEqualSameInstantButDifferentTimezone() {
        assertNotEqual(time(10000, UTC), time(10000, ZoneOffset.of("+01:00")));
    }

    @Test
    void shouldNotEqualSameInstantInSameLocalTimeButDifferentTimezone() {
        assertNotEqual(time(10, 52, 5, 6, UTC), time(11, 52, 5, 6, "+01:00"));
    }

    @Test
    void shouldBeAbleToParseTimeThatOverridesHeaderInformation() {
        String headerInformation = "{timezone:-01:00}";
        String data = "14:05:17Z";

        TimeValue expected = TimeValue.parse(data, orFail);
        TimeValue actual = TimeValue.parse(data, orFail, TemporalValue.parseHeaderInformation(headerInformation));

        assertEqual(expected, actual);
        assertEquals(UTC, actual.getZoneOffset());
    }

    @Test
    void shouldBeAbleToParseTimeWithoutTimeZoneWithHeaderInformation() {
        String headerInformation = "{timezone:-01:00}";
        String data = "14:05:17";

        TimeValue expected = TimeValue.parse(data, () -> ZoneId.of("-01:00"));
        TimeValue unexpected = TimeValue.parse(data, inUTC);
        TimeValue actual = TimeValue.parse(data, orFail, TemporalValue.parseHeaderInformation(headerInformation));

        assertEqual(expected, actual);
        assertNotEquals(unexpected, actual);
    }

    @Test
    void shouldWriteDerivedValueThatIsEqual() {
        TimeValue value1 = time(42, ZoneOffset.of("-18:00"));
        TimeValue value2 = time(value1.temporal());

        OffsetTime offsetTime1 = write(value1);
        OffsetTime offsetTime2 = write(value2);

        assertEquals(offsetTime1, offsetTime2);
    }

    @Test
    void shouldCompareDerivedValue() {
        TimeValue value1 = time(4242, ZoneOffset.of("-12:00"));
        TimeValue value2 = time(value1.temporal());

        assertEquals(0, value1.unsafeCompareTo(value2));
    }

    private static OffsetTime write(TimeValue value) {
        AtomicReference<OffsetTime> result = new AtomicReference<>();
        value.writeTo(new ThrowingValueWriter.AssertOnly() {
            @Override
            public void writeTime(OffsetTime offsetTime) {
                result.set(offsetTime);
            }
        });
        return result.get();
    }
}
