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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *  * Redistributions in binary form must reproduce the above copyright notice,
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 */
package test.java.time;

import java.time.Duration;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoUnit;

import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertThrows;

/**
 * Test Instant.
 * @bug 8273369 8331202 8364752
 */
@Test
public class TestInstant extends AbstractTest {

    @Test
    public void test_immutable() {
        assertImmutable(Instant.class);
    }

    @DataProvider(name="sampleEpochMillis")
    private Object[][] provider_sampleEpochMillis() {
        return new Object[][] {
            {"Long.MAX_VALUE", Long.MAX_VALUE},
            {"Long.MAX_VALUE-1", Long.MAX_VALUE - 1},
            {"1", 1L},
            {"0", 0L},
            {"-1", -1L},
            {"Long.MIN_VALUE+1", Long.MIN_VALUE + 1},
            {"Long.MIN_VALUE", Long.MIN_VALUE}
        };
    }

    @Test(dataProvider="sampleEpochMillis")
    public void test_epochMillis(String name, long millis) {
        Instant t1 = Instant.ofEpochMilli(millis);
        long m = t1.toEpochMilli();
        assertEquals(millis, m, name);
    }

    /**
     * Checks whether Instant.until() returning microseconds does not throw
     * an ArithmeticException for Instants apart for more than Long.MAX_VALUE
     * nanoseconds.
     */
    @Test
    public void test_microsUntil() {
        var nanoMax = Instant.EPOCH.plusNanos(Long.MAX_VALUE);
        var totalMicros = Instant.EPOCH.until(nanoMax, ChronoUnit.MICROS);
        var plusOneMicro = Instant.EPOCH.until(nanoMax.plusNanos(1000), ChronoUnit.MICROS);
        assertEquals(plusOneMicro - totalMicros, 1L);
    }

    /**
     * Checks whether Instant.until() returning milliseconds does not throw
     * an ArithmeticException for very large/small Instants
     */
    @Test
    public void test_millisUntil() {
        assertEquals(Instant.MIN.until(Instant.MIN.plusSeconds(1), ChronoUnit.MILLIS), 1000L);
        assertEquals(Instant.MAX.plusSeconds(-1).until(Instant.MAX, ChronoUnit.MILLIS), 1000L);
    }

    @DataProvider
    private Object[][] provider_until_1arg() {
        Instant t1 = Instant.ofEpochSecond(0, 10);
        Instant t2 = Instant.ofEpochSecond(10, -20);
        return new Object[][] {
            {t1, t2},
            {t2, t1},
            {Instant.MIN, Instant.MAX},
            {Instant.MAX, Instant.MIN},
        };
    }

    @Test(dataProvider = "provider_until_1arg")
    public void test_until_1arg(Instant start, Instant end) {
        Duration result = start.until(end);
        Duration expected = Duration.ofSeconds(end.getEpochSecond() - start.getEpochSecond(),
                end.getNano() - start.getNano());
        assertEquals(result, expected);
        expected = Duration.between(start, end);
        assertEquals(result, expected);
    }

    @Test
    public void test_until_1arg_NPE() {
        assertThrows(NullPointerException.class, () -> {
            Instant.now().until(null);
        });
    }

    @DataProvider
    private Object[][] valid_instants() {
        var I1 = OffsetDateTime.of(2017, 1, 1, 0, 0, 0, 0, ZoneOffset.of("+02")).toInstant();
        var I2 = OffsetDateTime.of(2017, 1, 1, 0, 0, 0, 0, ZoneOffset.of("+02:02")).toInstant();
        var I3 = OffsetDateTime.of(2017, 1, 1, 0, 0, 0, 0, ZoneOffset.of("+02:02:02")).toInstant();
        var I4 = OffsetDateTime.of(2017, 1, 1, 0, 0, 0, 0, ZoneOffset.of("Z")).toInstant();
        return new Object[][] {
            {"2017-01-01T00:00:00.000+02", I1},
            {"2017-01-01T00:00:00.000+0200", I1},
            {"2017-01-01T00:00:00.000+02:00", I1},
            {"2017-01-01T00:00:00.000+020000", I1},
            {"2017-01-01T00:00:00.000+02:00:00", I1},

            {"2017-01-01T00:00:00.000+0202", I2},
            {"2017-01-01T00:00:00.000+02:02", I2},

            {"2017-01-01T00:00:00.000+020202", I3},
            {"2017-01-01T00:00:00.000+02:02:02", I3},

            {"2017-01-01T00:00:00.000Z", I4},
        };
    }

    @Test(dataProvider = "valid_instants")
    public void test_parse_valid(String instant, Instant expected) {
        assertEquals(Instant.parse(instant), expected);
    }

    @DataProvider
    private Object[][] invalid_instants() {
        return new Object[][] {
            {"2017-01-01T00:00:00.000"},
            {"2017-01-01T00:00:00.000+0"},
            {"2017-01-01T00:00:00.000+0:"},
            {"2017-01-01T00:00:00.000+02:"},
            {"2017-01-01T00:00:00.000+020"},
            {"2017-01-01T00:00:00.000+02:0"},
            {"2017-01-01T00:00:00.000+02:0:"},
            {"2017-01-01T00:00:00.000+02:00:"},
            {"2017-01-01T00:00:00.000+02:000"},
            {"2017-01-01T00:00:00.000+02:00:0"},
            {"2017-01-01T00:00:00.000+02:00:0:"},
            {"2017-01-01T00:00:00.000+0200000"},
            {"2017-01-01T00:00:00.000+02:00:000"},
            {"2017-01-01T00:00:00.000+02:00:00:"},
            {"2017-01-01T00:00:00.000UTC"},
        };
    }

    @Test(dataProvider = "invalid_instants")
    public void test_parse_invalid(String instant) {
        assertThrows(DateTimeParseException.class, () -> Instant.parse(instant));
    }
}
