<?php

declare(strict_types=1);

namespace App\Tests\Model;

use App\Model\TimeRange;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;
use Twig\Environment;
use Twig\Loader\ArrayLoader;

class TimeRangeTest extends TestCase
{
    public function testAWholeDayRunsFromMidnightToMidnight(): void
    {
        $range = TimeRange::wholeDay();

        self::assertTrue($range->isAllDay());
        self::assertSame(0, $range->startMinute);
        self::assertSame(1440, $range->endMinute);
    }

    public function testTheEndMustComeAfterTheStart(): void
    {
        $this->expectException(\InvalidArgumentException::class);

        TimeRange::fromMinutes(13 * 60, 9 * 60);
    }

    public function testARangeCannotLeaveTheDay(): void
    {
        $this->expectException(\InvalidArgumentException::class);

        TimeRange::fromMinutes(0, 1441);
    }

    public function testTouchingRangesDoNotOverlap(): void
    {
        $morning = TimeRange::fromMinutes(9 * 60, 13 * 60);
        $afternoon = TimeRange::fromMinutes(13 * 60, 17 * 60);

        // Half-open, so handing a desk over at 13:00 is not a collision.
        self::assertFalse($morning->overlaps($afternoon));
        self::assertFalse($afternoon->overlaps($morning));
    }

    public function testPartlyCoveringRangesOverlapBothWays(): void
    {
        $a = TimeRange::fromMinutes(9 * 60, 13 * 60);
        $b = TimeRange::fromMinutes(12 * 60, 17 * 60);

        self::assertTrue($a->overlaps($b));
        self::assertTrue($b->overlaps($a));
    }

    public function testAWholeDayOverlapsEverything(): void
    {
        self::assertTrue(TimeRange::wholeDay()->overlaps(TimeRange::fromMinutes(0, 15)));
    }

    #[DataProvider('urlPairs')]
    public function testParsingTheBoardsQueryParameters(?string $from, ?string $to, ?string $expected): void
    {
        $range = TimeRange::parse($from, $to);

        self::assertSame($expected, null === $range ? null : $range->start().'-'.$range->end());
    }

    /**
     * @return iterable<string, array{?string, ?string, ?string}>
     */
    public static function urlPairs(): iterable
    {
        yield 'both given' => ['09:00', '13:00', '09:00-13:00'];
        yield 'only a start is open to the end of the day' => ['09:00', null, '09:00-24:00'];
        yield 'only an end is open from midnight' => [null, '13:00', '00:00-13:00'];
        yield 'neither means the whole day, i.e. no filter' => [null, null, null];
        yield 'empty strings are the same as absent' => ['', '', null];
        yield 'reversed is rejected' => ['13:00', '09:00', null];
        yield 'equal is rejected' => ['09:00', '09:00', null];
        yield 'nonsense is rejected' => ['halb zehn', '13:00', null];
        yield 'out of range is rejected' => ['25:00', '26:00', null];
    }

    public function testRemainingIsTheWholeSpanWhenNothingIsTaken(): void
    {
        $free = TimeRange::remaining(TimeRange::wholeDay(), []);

        self::assertSame(['00:00–24:00'], self::render($free));
    }

    public function testRemainingSplitsAroundABookingInTheMiddle(): void
    {
        $free = TimeRange::remaining(TimeRange::wholeDay(), [TimeRange::fromMinutes(540, 780)]);

        self::assertSame(['00:00–09:00', '13:00–24:00'], self::render($free));
    }

    public function testRemainingIsEmptyWhenTheSpanIsFullyCovered(): void
    {
        self::assertSame([], TimeRange::remaining(TimeRange::wholeDay(), [TimeRange::wholeDay()]));
    }

    public function testRemainingHandlesOverlappingAndUnsortedInput(): void
    {
        // Bookings on one resource cannot overlap, but the span may be covered by several that
        // touch, and nothing guarantees the order they arrive in.
        $free = TimeRange::remaining(TimeRange::wholeDay(), [
            TimeRange::fromMinutes(780, 1020),
            TimeRange::fromMinutes(540, 900),
        ]);

        self::assertSame(['00:00–09:00', '17:00–24:00'], self::render($free));
    }

    public function testRemainingIgnoresWhatFallsOutsideTheSpan(): void
    {
        $free = TimeRange::remaining(TimeRange::fromMinutes(780, 1020), [TimeRange::fromMinutes(0, 540)]);

        self::assertSame(['13:00–17:00'], self::render($free));
    }

    public function testRemainingClipsABookingThatOverhangsTheSpan(): void
    {
        $free = TimeRange::remaining(TimeRange::fromMinutes(480, 1080), [TimeRange::fromMinutes(0, 600)]);

        self::assertSame(['10:00–18:00'], self::render($free));
    }

    public function testDurationIsInMinutes(): void
    {
        self::assertSame(240, TimeRange::fromMinutes(540, 780)->durationInMinutes());
        self::assertSame(1440, TimeRange::wholeDay()->durationInMinutes());
    }

    /**
     * Regression guard for a trap that cost real debugging time: Twig resolves `range.allDay` by
     * looking for a method literally named `allDay` BEFORE it tries `isAllDay()`, and it happily
     * calls a static one. While the factory was called allDay(), every template read back a
     * freshly built all-day range -- always truthy -- so the whole board silently ignored the
     * selected span. Renaming the factory to wholeDay() is what fixes it; this keeps it fixed.
     */
    public function testTheAllDayAccessorIsNotShadowedInTwig(): void
    {
        $twig = new Environment(new ArrayLoader(['t' => '{{ range.allDay ? "yes" : "no" }}']));

        self::assertSame('no', $twig->render('t', ['range' => TimeRange::fromMinutes(9 * 60, 13 * 60)]));
        self::assertSame('yes', $twig->render('t', ['range' => TimeRange::wholeDay()]));
    }

    public function testAOneSidedRangeReadsAsAbOrBis(): void
    {
        self::assertSame('bis 13:00', (string) TimeRange::fromMinutes(TimeRange::DAY_START, 13 * 60));
        self::assertSame('ab 13:00', (string) TimeRange::fromMinutes(13 * 60, TimeRange::DAY_END));
        self::assertSame('09:00–13:00', (string) TimeRange::fromMinutes(9 * 60, 13 * 60));
        self::assertSame('ganztägig', (string) TimeRange::wholeDay());
    }

    /**
     * @param list<TimeRange> $ranges
     *
     * @return list<string>
     */
    private static function render(array $ranges): array
    {
        return array_map(static fn (TimeRange $range): string => $range->start().'–'.$range->end(), $ranges);
    }
}