<?php

declare(strict_types=1);

namespace App\Tests\Booking;

use App\Booking\Horizon;
use PHPUnit\Framework\TestCase;

class HorizonTest extends TestCase
{
    public function testTheHorizonIsThreeMonthsFromTheGivenDay(): void
    {
        self::assertSame(
            '2026-12-14',
            Horizon::latest(new \DateTimeImmutable('2026-09-14'))->format('Y-m-d'),
        );
    }

    /**
     * PHP's "+3 months" from a 31st overflows into the next month (31 November does not exist,
     * so it becomes 1 December). Pinned rather than clamped: this is a cap, and one extra day of
     * horizon four times a year is not worth the arithmetic it would take to remove. The
     * recurrence code deliberately avoids months for exactly this reason -- see
     * RecurrenceRule::intervalDays() -- but a single boundary can live with it.
     */
    public function testAMonthEndOverflowsByADayAndThatIsAccepted(): void
    {
        self::assertSame(
            '2026-12-01',
            Horizon::latest(new \DateTimeImmutable('2026-08-31'))->format('Y-m-d'),
        );
    }

    public function testTheTimePartIsDroppedSoTheComparisonIsPerDay(): void
    {
        self::assertSame(
            '00:00:00',
            Horizon::latest(new \DateTimeImmutable('2026-09-14 17:42:13'))->format('H:i:s'),
        );
    }

    public function testItDefaultsToToday(): void
    {
        self::assertEquals(
            Horizon::latest(new \DateTimeImmutable('today')),
            Horizon::latest(),
        );
    }
}