<?php

namespace Tests\Unit;

use App\Support\DateRange;
use DateTime;
use PHPUnit\Framework\TestCase;

class DateRangeTest extends TestCase
{
    public function test_a_single_day_counts_as_one(): void
    {
        $day = new DateTime('2026-07-16');

        $this->assertSame(1, DateRange::inclusiveDays($day, $day));
    }

    public function test_both_ends_are_counted(): void
    {
        // An- und Abreisetag zählen beide mit.
        $this->assertSame(2, DateRange::inclusiveDays(new DateTime('2026-07-16'), new DateTime('2026-07-17')));
        $this->assertSame(5, DateRange::inclusiveDays(new DateTime('2026-07-16'), new DateTime('2026-07-20')));
    }

    public function test_the_order_of_the_arguments_does_not_matter(): void
    {
        $early = new DateTime('2026-07-16');
        $late = new DateTime('2026-07-20');

        $this->assertSame(
            DateRange::inclusiveDays($early, $late),
            DateRange::inclusiveDays($late, $early)
        );
    }

    public function test_month_and_year_boundaries_are_handled(): void
    {
        $this->assertSame(3, DateRange::inclusiveDays(new DateTime('2026-07-30'), new DateTime('2026-08-01')));
        $this->assertSame(3, DateRange::inclusiveDays(new DateTime('2026-12-31'), new DateTime('2027-01-02')));
        // 2028 ist ein Schaltjahr.
        $this->assertSame(2, DateRange::inclusiveDays(new DateTime('2028-02-28'), new DateTime('2028-02-29')));
    }
}