<?php
// DateTimeTest.php
// Created: 2021-06-14
// Updated: 2022-02-27

declare(strict_types=1);

use PHPUnit\Framework\TestCase;
use Index\DateTime;
use Index\TimeSpan;
use Index\TimeZoneInfo;

/**
 * @covers DateTime
 * @covers TimeSpan
 * @covers TimeZoneInfo
 */
final class DateTimeTest extends TestCase {
    public function testAttributes(): void {
        $index = new DateTime('2021-06-14T21:07:14.359324 CEST');
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);
        $this->assertEquals($index->getDayOfWeek(), DateTime::MONDAY);
        $this->assertEquals($index->getDayOfYear(), 165);
        $this->assertEquals($index->getWeek(), 24);
        $this->assertTrue($index->isDaylightSavingTime());
        $this->assertFalse($index->isLeapYear());
        $this->assertFalse($index->isUTC());

        $indexDate = $index->getDate();
        $this->assertEquals($indexDate->getYear(), 2021);
        $this->assertEquals($indexDate->getMonth(), 6);
        $this->assertEquals($indexDate->getDay(), 14);
        $this->assertEquals($indexDate->getHour(), 0);
        $this->assertEquals($indexDate->getMinute(), 0);
        $this->assertEquals($indexDate->getSecond(), 0);
        $this->assertEquals($indexDate->getMillisecond(), 0);
        $this->assertEquals($indexDate->getMicrosecond(), 0);
        $this->assertEquals($indexDate->getDayOfWeek(), DateTime::MONDAY);
        $this->assertEquals($indexDate->getDayOfYear(), 165);
        $this->assertEquals($indexDate->getWeek(), 24);

        $indexTime = $index->getTimeOfDay();
        $this->assertEquals($indexTime->getHours(), 21);
        $this->assertEquals($indexTime->getMinutes(), 7);
        $this->assertEquals($indexTime->getSeconds(), 14);
        $this->assertEquals($indexTime->getMilliseconds(), 359);
        $this->assertEquals($indexTime->getMicroseconds(), 359324);
    }

    public function testTimeZone(): void {
        $index1 = DateTime::utcNow();
        $index2 = DateTime::now(new TimeZoneInfo('Australia/Melbourne'));
        $this->assertEquals($index1->getUnixTimeSeconds(), $index2->getUnixTimeSeconds());
    }

    public function testSetters(): void {
        $index = new DateTime('2021-06-14T21:07:14.359324 CEST');
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);

        $index = $index->setDate(2005, 3, 9);
        $this->assertEquals($index->getYear(), 2005);
        $this->assertEquals($index->getMonth(), 3);
        $this->assertEquals($index->getDay(), 9);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);

        $index = $index->setISODate(2011, 20, 5);
        $this->assertEquals($index->getYear(), 2011);
        $this->assertEquals($index->getMonth(), 5);
        $this->assertEquals($index->getDay(), 20);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);

        $index = $index->setTime(10, 46, 50, 987654);
        $this->assertEquals($index->getYear(), 2011);
        $this->assertEquals($index->getMonth(), 5);
        $this->assertEquals($index->getDay(), 20);
        $this->assertEquals($index->getHour(), 10);
        $this->assertEquals($index->getMinute(), 46);
        $this->assertEquals($index->getSecond(), 50);
        $this->assertEquals($index->getMillisecond(), 987);
        $this->assertEquals($index->getMicrosecond(), 987654);

        $index = $index->setTimestamp(1623702634);
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 22);
        $this->assertEquals($index->getMinute(), 30);
        $this->assertEquals($index->getSecond(), 34);
        $this->assertEquals($index->getMillisecond(), 0);
        $this->assertEquals($index->getMicrosecond(), 0);
        $this->assertFalse($index->isUTC());
    }

    public function testUnixTimestamp(): void {
        $index = DateTime::fromUnixTimeSeconds(1623696039);
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 18);
        $this->assertEquals($index->getMinute(), 40);
        $this->assertEquals($index->getSecond(), 39);
        $this->assertEquals($index->getMillisecond(), 0);
        $this->assertEquals($index->getMicrosecond(), 0);
        $this->assertEquals($index->getUnixTimeSeconds(), 1623696039);
        $this->assertEquals($index->getUnixTimeMilliseconds(), 1623696039000);
        $this->assertTrue($index->isUTC());

        $index = DateTime::fromUnixTimeMilliseconds(1623696422656);
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 18);
        $this->assertEquals($index->getMinute(), 47);
        $this->assertEquals($index->getSecond(), 2);
        $this->assertEquals($index->getMillisecond(), 656);
        $this->assertEquals($index->getMicrosecond(), 656000);
        $this->assertEquals($index->getUnixTimeSeconds(), 1623696422);
        $this->assertEquals($index->getUnixTimeMilliseconds(), 1623696422656);
        $this->assertTrue($index->isUTC());
    }

    // verify the results of this at some point
    public function testAdding(): void {
        $index = new DateTime('2021-06-14T21:07:14.359324Z');

        // Confirm initial state
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);

        // Add
        $index = $index->add(TimeSpan::create(1, 0, 10, 0));
        $this->assertEquals($index->getDay(), 15);
        $this->assertEquals($index->getMinute(), 17);

        // Add years
        $index = $index->addYears(1);
        $this->assertEquals($index->getYear(), 2022);
        $this->assertEquals($index->getMonth(), 6);
        $index  = $index->addYears(1.5);
        $this->assertEquals($index->getYear(), 2023);
        $this->assertEquals($index->getMonth(), 12);

        // Add months
        $index = $index->addMonths(1);
        $this->assertEquals($index->getMonth(), 12);
        $this->assertEquals($index->getDay(), 16);
        $index = $index->addMonths(1.5);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 15);

        // Add days
        $index = $index->addDays(1);
        $this->assertEquals($index->getDay(), 16);
        $this->assertEquals($index->getHour(), 21);
        $index = $index->addDays(1.5);
        $this->assertEquals($index->getDay(), 18);
        $this->assertEquals($index->getHour(), 9);

        // Add hours
        $index = $index->addHours(1);
        $this->assertEquals($index->getHour(), 10);
        $this->assertEquals($index->getMinute(), 17);
        $index = $index->addHours(1.5);
        $this->assertEquals($index->getHour(), 11);
        $this->assertEquals($index->getMinute(), 47);

        // Add minutes
        $index = $index->addMinutes(1);
        $this->assertEquals($index->getMinute(), 48);
        $this->assertEquals($index->getSecond(), 14);
        $index = $index->addMinutes(1.5);
        $this->assertEquals($index->getMinute(), 49);
        $this->assertEquals($index->getSecond(), 44);

        // Add seconds
        $index = $index->addSeconds(1);
        $this->assertEquals($index->getSecond(), 45);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);
        $index = $index->addSeconds(1.5);
        $this->assertEquals($index->getSecond(), 46);
        $this->assertEquals($index->getMillisecond(), 859);
        $this->assertEquals($index->getMicrosecond(), 859324);

        // Add milliseconds
        $index = $index->addMilliseconds(1);
        $this->assertEquals($index->getMillisecond(), 860);
        $this->assertEquals($index->getMicrosecond(), 860324);
        $index = $index->addMilliseconds(1.5);
        $this->assertEquals($index->getMillisecond(), 861);
        $this->assertEquals($index->getMicrosecond(), 861824);

        // Add microseconds
        $index = $index->addMicroseconds(1);
        $this->assertEquals($index->getMicrosecond(), 861825);
        $index = $index->addMicroseconds(1.5);
        $this->assertEquals($index->getMicrosecond(), 861826);
    }

    public function testSubtract(): void {
        $index = new DateTime('2021-06-14T21:07:14.359324Z');

        // Confirm initial state
        $this->assertEquals($index->getYear(), 2021);
        $this->assertEquals($index->getMonth(), 6);
        $this->assertEquals($index->getDay(), 14);
        $this->assertEquals($index->getHour(), 21);
        $this->assertEquals($index->getMinute(), 7);
        $this->assertEquals($index->getSecond(), 14);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);

        // Subtract
        $index = $index->subtract(TimeSpan::fromDays(400.12));
        $this->assertEquals($index->getYear(), 2020);
        $this->assertEquals($index->getMonth(), 5);
        $this->assertEquals($index->getDay(), 10);
        $this->assertEquals($index->getHour(), 18);
        $this->assertEquals($index->getMinute(), 14);
        $this->assertEquals($index->getSecond(), 26);
        $this->assertEquals($index->getMillisecond(), 359);
        $this->assertEquals($index->getMicrosecond(), 359324);
    }

    public function testDifference(): void {
        $index1 = new DateTime('2021-06-14T21:07:14Z');
        $index2 = DateTime::create(2013, 1, 27, 23, 14, 44, 0, new TimeZoneInfo('Europe/Amsterdam'));
        $diff = $index1->difference($index2);

        $this->assertEquals($diff->getDays(), 3061);
        $this->assertEquals($diff->getHours(), 22);
        $this->assertEquals($diff->getMinutes(), 52);
        $this->assertEquals($diff->getSeconds(), 30);
        $this->assertTrue($diff->isNegative());

        $this->assertEquals($diff->totalDays(), 3061.953125);
        $this->assertEquals($diff->totalHours(), 73486.875);
        $this->assertEquals($diff->totalMinutes(), 4409212.5);
        $this->assertEquals($diff->totalSeconds(), 264552750);
        $this->assertEquals($diff->totalMilliseconds(), 264552750000);
        $this->assertEquals($diff->totalMicroseconds(), 264552750000000);

        $negated = $diff->negate();
        $this->assertEquals($negated->getDays(), 3061);
        $this->assertEquals($negated->getHours(), 22);
        $this->assertEquals($negated->getMinutes(), 52);
        $this->assertEquals($negated->getSeconds(), 30);
        $this->assertFalse($negated->isNegative());
    }

    public function testModify(): void {
        $index = new DateTime('2021-06-14T21:07:14Z');
        $this->assertEquals($index->getMonth(), 6);

        $index = $index->modify('+1 month');
        $this->assertEquals($index->getMonth(), 7);
    }

    public function testCreate(): void {
        $index = DateTime::create(2013, 1, 27, 23, 14, 44, 0, new TimeZoneInfo('Europe/Amsterdam'));
        $this->assertEquals($index->getYear(), 2013);
        $this->assertEquals($index->getMonth(), 1);
        $this->assertEquals($index->getDay(), 27);
        $this->assertEquals($index->getHour(), 23);
        $this->assertEquals($index->getMinute(), 14);
        $this->assertEquals($index->getSecond(), 44);

        $index = $index->setTimezone(new TimeZoneInfo('UTC'));
        $this->assertEquals($index->getHour(), 22);

        $index = $index->setTimezone(new TimeZoneInfo('Asia/Tokyo'));
        $this->assertEquals($index->getDay(), 28);
        $this->assertEquals($index->getHour(), 7);

        $index = $index->setTimezone(new TimeZoneInfo('America/New_York'));
        $this->assertEquals($index->getDay(), 27);
        $this->assertEquals($index->getHour(), 17);

        $index = DateTime::createFromFormat('Y-m-d H:i:s', '2012-05-20 10:14:28');
        $this->assertEquals($index->format('Y-m-d H:i:s'), '2012-05-20 10:14:28');

        $this->assertFalse(DateTime::createFromFormat('Y-m-d H:i:s', 'mewow'));

        $mutable = new \DateTime('2021-06-14T20:20:46Z');

        $index = DateTime::createFromInterface($mutable);
        $this->assertEquals($index->getUnixTimeMilliseconds(), (float)$mutable->format('Uv'));
        $this->assertEquals($index->getTimezone()->getName(), '+00:00');

        $index = DateTime::createFromMutable($mutable);
        $this->assertEquals($index->getUnixTimeMilliseconds(), (float)$mutable->format('Uv'));
    }

    public function testToString(): void {
        $dateTime = DateTime::create(2013, 1, 27, 23, 14, 44, 0, new TimeZoneInfo('Europe/Amsterdam'));
        $this->assertEquals((string)$dateTime, '2013-01-27T23:14:44+01:00');
        $this->assertEquals(json_encode($dateTime), '"2013-01-27T23:14:44+01:00"');
        $this->assertEquals((string)$dateTime->toISO8601String(), '2013-01-27T23:14:44+01:00');
        $this->assertEquals((string)$dateTime->toCookieString(), 'Sunday, 27-Jan-2013 23:14:44 CET');
        $this->assertEquals((string)$dateTime->toRFC822String(), 'Sun, 27 Jan 13 23:14:44 +0100');

        $dateTime = $dateTime->setTimezone(TimeZoneInfo::utc());
        $this->assertEquals((string)$dateTime, '2013-01-27T22:14:44+00:00');
        $this->assertEquals(json_encode($dateTime), '"2013-01-27T22:14:44+00:00"');
        $this->assertEquals((string)$dateTime->toISO8601String(), '2013-01-27T22:14:44+00:00');
        $this->assertEquals((string)$dateTime->toCookieString(), 'Sunday, 27-Jan-2013 22:14:44 UTC');
        $this->assertEquals((string)$dateTime->toRFC822String(), 'Sun, 27 Jan 13 22:14:44 +0000');
    }

    public function testCompare(): void {
        $index1 = new DateTime('2021-06-14T21:07:14Z');
        $index2 = DateTime::create(2013, 1, 27, 23, 14, 44, 0, new TimeZoneInfo('Europe/Amsterdam'));

        $this->assertGreaterThan(0, $index1->compare($index2));
        $this->assertLessThan(0, $index2->compare($index1));
        $this->assertEquals(0, $index1->compare($index1));
    }

    public function testEquals(): void {
        $index1 = new DateTime('2021-06-14T21:07:14Z');
        $index2 = DateTime::create(2013, 1, 27, 23, 14, 44, 0, new TimeZoneInfo('Europe/Amsterdam'));

        $this->assertFalse($index1->equals($index2));
        $this->assertFalse($index2->equals($index1));
        $this->assertTrue($index1->equals($index1));
    }

    public function testCasting(): void {
        $nativeDT = new \DateTime;
        $this->assertInstanceOf(DateTime::class, $nativeDTCast = DateTime::cast($nativeDT));
        $this->assertNotSame($nativeDT, $nativeDTCast);

        $indexDT = new DateTime;
        $this->assertInstanceOf(DateTime::class, $indexDTCast = DateTime::cast($indexDT));
        $this->assertSame($indexDT, $indexDTCast);
    }

    public function testTimeZoneOrder(): void {
        $all = TimeZoneInfo::all(true);
        $lastOffset = null;
        $lastString = null;

        foreach($all as $timeZone) {
            $offset = $timeZone->getOffset();
            $string = $timeZone->getName();

            if($lastOffset !== null) {
                $diff = $lastOffset <=> $offset;
                $this->assertLessThanOrEqual(0, $diff);

                if($diff === 0)
                    $this->assertLessThanOrEqual(0, $lastString <=> $string);
            }

            $lastOffset = $offset;
            $lastString = $string;
        }
    }
}