<?php

declare(strict_types=1);

/**
 * This file is part of the Carbon package.
 *
 * (c) Brian Nesbitt <brian@nesbot.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Tests\Carbon;

use Carbon\Carbon;
use Carbon\CarbonInterval;
use DateInterval;
use InvalidArgumentException;
use Tests\AbstractTestCase;

class RoundTest extends AbstractTestCase
{
    public function testRoundWithDefaultUnit()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);
        $copy = $dt->copy();
        $ref = $copy->round();
        $this->assertSame($ref, $copy);
        $this->assertCarbon($ref, 2315, 7, 18, 22, 42, 18, 0);

        $this->assertCarbon($dt->copy()->round(5), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->floor()->round(5), 2315, 7, 18, 22, 42, 15, 0);
        $this->assertCarbon($dt->copy()->round(3), 2315, 7, 18, 22, 42, 18, 0);
        $this->assertCarbon($dt->copy()->round(4), 2315, 7, 18, 22, 42, 16, 0);
        $this->assertCarbon($dt->copy()->round(10), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->round(0.5), 2315, 7, 18, 22, 42, 17, 500000);
        $this->assertCarbon($dt->copy()->round(0.25), 2315, 7, 18, 22, 42, 17, 750000);
        $this->assertCarbon($dt->copy()->round(3.8), 2315, 7, 18, 22, 42, 19, 800000);

        $this->assertCarbon($dt->copy()->floor(5), 2315, 7, 18, 22, 42, 15, 0);
        $this->assertCarbon($dt->copy()->floor()->floor(5), 2315, 7, 18, 22, 42, 15, 0);
        $this->assertCarbon($dt->copy()->floor(3), 2315, 7, 18, 22, 42, 15, 0);
        $this->assertCarbon($dt->copy()->floor(4), 2315, 7, 18, 22, 42, 16, 0);
        $this->assertCarbon($dt->copy()->floor(10), 2315, 7, 18, 22, 42, 10, 0);
        $this->assertCarbon($dt->copy()->floor(0.5), 2315, 7, 18, 22, 42, 17, 500000);
        $this->assertCarbon($dt->copy()->floor(0.25), 2315, 7, 18, 22, 42, 17, 500000);
        $this->assertCarbon($dt->copy()->floor(3.8), 2315, 7, 18, 22, 42, 15, 0);

        $this->assertCarbon($dt->copy()->ceil(5), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->floor()->ceil(5), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->ceil(3), 2315, 7, 18, 22, 42, 18, 0);
        $this->assertCarbon($dt->copy()->ceil(4), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->ceil(10), 2315, 7, 18, 22, 42, 20, 0);
        $this->assertCarbon($dt->copy()->ceil(0.5), 2315, 7, 18, 22, 42, 18, 0);
        $this->assertCarbon($dt->copy()->ceil(0.25), 2315, 7, 18, 22, 42, 17, 750000);
        $this->assertCarbon($dt->copy()->ceil(3.8), 2315, 7, 18, 22, 42, 19, 800000);
    }

    public function testRoundWithStrings()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);

        $this->assertCarbon($dt->copy()->round('minute'), 2315, 7, 18, 22, 42, 0, 0);
        $this->assertCarbon($dt->copy()->floor('5 minutes'), 2315, 7, 18, 22, 40, 0, 0);
        $this->assertCarbon($dt->copy()->ceil('5 minutes'), 2315, 7, 18, 22, 45, 0, 0);
    }

    public function testRoundWithStringsException()
    {
        $this->expectExceptionObject(new InvalidArgumentException(
            'Rounding is only possible with single unit intervals.',
        ));
        Carbon::create(2315, 7, 18, 22, 42, 17.643971)->round('2 hours 5 minutes');
    }

    public function testRoundWithInterval()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);

        $this->assertCarbon($dt->copy()->round(CarbonInterval::minute()), 2315, 7, 18, 22, 42, 0, 0);
        $this->assertCarbon($dt->copy()->floor(CarbonInterval::minutes(5)), 2315, 7, 18, 22, 40, 0, 0);
        $this->assertCarbon($dt->copy()->ceil(new DateInterval('PT5M')), 2315, 7, 18, 22, 45, 0, 0);
    }

    public function testRoundWithIntervalException()
    {
        $this->expectExceptionObject(new InvalidArgumentException(
            'Rounding is only possible with single unit intervals.',
        ));

        Carbon::create(2315, 7, 18, 22, 42, 17.643971)->round(CarbonInterval::day()->minutes(5));
    }

    public function testRoundWithBaseUnit()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);
        $copy = $dt->copy();
        $ref = $copy->roundSecond();
        $this->assertSame($ref, $copy);
        $this->assertCarbon($ref, 2315, 7, 18, 22, 42, 18, 0);

        $this->assertCarbon($dt->copy()->roundDay(), 2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundDay(5), 2315, 7, 21, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->ceilDay(), 2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->floorDay(), 2315, 7, 18, 0, 0, 0, 0);

        $this->assertCarbon($dt->copy()->roundYear(), 2316, 1, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->subMonths(2)->roundYear(), 2315, 1, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundYear(2), 2315, 1, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->floorYear(2), 2315, 1, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->ceilYear(2), 2317, 1, 1, 0, 0, 0, 0);

        $this->assertCarbon($dt->copy()->roundMonth(), 2315, 8, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->floorMonth(), 2315, 7, 1, 0, 0, 0, 0);

        for ($i = 1; $i <= Carbon::MONTHS_PER_YEAR; $i++) {
            $dt = Carbon::parse("2021-$i-01")->endOfMonth()->floorMonth();

            $this->assertCarbon($dt, 2021, $i, 1, 0, 0, 0, 0);
        }
    }

    public function testFloorYear()
    {
        $date = Carbon::create(2022)->endOfYear()->floorYear();
        $this->assertCarbon($date, 2022, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->endOfYear()->floorDay()->floorYear();
        $this->assertCarbon($date, 2022, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->endOfYear()->floorYear();
        $this->assertCarbon($date, 2022, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->addMonths(6)->floorYear();
        $this->assertCarbon($date, 2022, 1, 1, 0, 0, 0, 0);
    }

    public function testCeilYear()
    {
        $date = Carbon::create(2022)->addMonths(6)->ceilYear();
        $this->assertCarbon($date, 2023, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->endOfYear()->ceilYear();
        $this->assertCarbon($date, 2023, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->ceilYear();
        $this->assertCarbon($date, 2022, 1, 1, 0, 0, 0, 0);

        $date = Carbon::create(2022)->addMicrosecond()->ceilYear();
        $this->assertCarbon($date, 2023, 1, 1, 0, 0, 0, 0);
    }

    public function testRoundWithMetaUnit()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);
        $copy = $dt->copy();
        $ref = $copy->roundSecond();
        $this->assertSame($ref, $copy);
        $this->assertCarbon($ref, 2315, 7, 18, 22, 42, 18, 0);

        $this->assertCarbon($dt->copy()->roundMillisecond(), 2315, 7, 18, 22, 42, 17, 644000);
        $this->assertCarbon($dt->copy()->roundMillennium(), 2001, 1, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundQuarter(), 2315, 7, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundQuarters(2), 2315, 7, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->subMonth()->floorQuarter(), 2315, 4, 1, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->subMonth()->floorQuarters(2), 2315, 1, 1, 0, 0, 0, 0);
    }

    public function testRoundWeek()
    {
        $dt = Carbon::create(2315, 7, 18, 22, 42, 17.643971);
        $copy = $dt->copy();
        $ref = $copy->roundSecond();
        $this->assertSame($ref, $copy);
        $this->assertCarbon($ref, 2315, 7, 18, 22, 42, 18, 0);

        $this->assertCarbon($dt->copy()->floorWeek(), 2315, 7, 12, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->ceilWeek(), 2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundWeek(), 2315, 7, 19, 0, 0, 0, 0);

        $dt = Carbon::create(2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->floorWeek(), 2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->ceilWeek(), 2315, 7, 19, 0, 0, 0, 0);
        $this->assertCarbon($dt->copy()->roundWeek(), 2315, 7, 19, 0, 0, 0, 0);
    }

    public function testCeilMonth()
    {
        $this->assertCarbon(Carbon::parse('2021-01-29')->ceilMonth(), 2021, 2, 1, 0, 0, 0);
        $this->assertCarbon(Carbon::parse('2021-01-31')->ceilMonth(), 2021, 2, 1, 0, 0, 0);
        $this->assertCarbon(Carbon::parse('2021-12-17')->ceilMonth(), 2022, 1, 1, 0, 0, 0);
    }

    public function testFloorMonth()
    {
        $this->assertCarbon(Carbon::parse('2021-05-31')->floorMonth(3), 2021, 4, 1, 0, 0, 0);
    }

    public function testRoundInvalidArgument()
    {
        $this->expectExceptionObject(new InvalidArgumentException(
            'Unknown unit \'foobar\'.',
        ));

        Carbon::now()->roundUnit('foobar');
    }

    public function testRoundWithNumericPrecisionCarry()
    {
        // A numeric precision >= 60s must carry, like the equivalent string unit.
        $dt = Carbon::create(2026, 1, 1, 14, 21, 37);

        $this->assertCarbon($dt->copy()->round(3600), 2026, 1, 1, 14, 0, 0, 0);
        $this->assertTrue($dt->copy()->round(3600)->eq($dt->copy()->round('hour')));

        $this->assertCarbon($dt->copy()->round(120), 2026, 1, 1, 14, 22, 0, 0);
        $this->assertTrue($dt->copy()->round(120)->eq($dt->copy()->round('2 minutes')));

        $this->assertCarbon($dt->copy()->round(86400), 2026, 1, 2, 0, 0, 0, 0);
        $this->assertTrue($dt->copy()->round(86400)->eq($dt->copy()->round('day')));

        // floor() with numeric precision must also carry, not just clamp within the minute.
        $almostNextHour = Carbon::create(2026, 1, 1, 14, 59, 59);
        $this->assertCarbon($almostNextHour->copy()->floor(3600), 2026, 1, 1, 14, 0, 0, 0);
        $this->assertTrue($almostNextHour->copy()->floor(3600)->eq($almostNextHour->copy()->floor('hour')));

        // ceil() with numeric precision must carry across the hour boundary.
        $halfPastHour = Carbon::create(2026, 1, 1, 14, 30, 0);
        $this->assertCarbon($halfPastHour->copy()->ceil(3600), 2026, 1, 1, 15, 0, 0, 0);
        $this->assertTrue($halfPastHour->copy()->ceil(3600)->eq($halfPastHour->copy()->ceil('hour')));

        // Carry across a month boundary via a day-level numeric precision.
        $monthEnd = Carbon::create(2026, 1, 31, 20, 0, 0);
        $this->assertCarbon($monthEnd->copy()->round(86400), 2026, 2, 1, 0, 0, 0, 0);

        // Sub-minute numeric precision must keep rounding within the second field, unchanged.
        $this->assertCarbon($dt->copy()->round(30), 2026, 1, 1, 14, 21, 30, 0);
    }

    public function testNumericPrecisionCarryFromAnyUnit(): void
    {
        $dt = Carbon::parse('2026-01-01 14:21:03');

        // A precision counting minutes spans a whole day just as one counting
        // seconds does, so it has to carry the same way.
        $this->assertCarbon($dt->copy()->roundMinutes(24 * 60), 2026, 1, 2, 0, 0, 0, 0);
        $this->assertTrue($dt->copy()->roundMinutes(24 * 60)->eq($dt->copy()->round('day')));

        $this->assertCarbon($dt->copy()->roundHours(24), 2026, 1, 2, 0, 0, 0, 0);
        $this->assertTrue($dt->copy()->roundHours(24)->eq($dt->copy()->round('day')));

        $this->assertCarbon($dt->copy()->roundMinutes(60), 2026, 1, 1, 14, 0, 0, 0);
        $this->assertTrue($dt->copy()->roundMinutes(60)->eq($dt->copy()->round('hour')));

        $this->assertCarbon(Carbon::parse('2026-08-20')->roundMonths(12), 2027, 1, 1, 0, 0, 0, 0);
        $this->assertTrue(Carbon::parse('2026-08-20')->roundMonths(12)->eq(Carbon::parse('2026-08-20')->round('year')));

        // A precision that stays inside its own unit is untouched.
        $this->assertCarbon($dt->copy()->roundMinutes(30), 2026, 1, 1, 14, 30, 0, 0);
        $this->assertCarbon($dt->copy()->roundSeconds(30), 2026, 1, 1, 14, 21, 0, 0);
    }
}