<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Availability;

use Unsupervised\Schedular\Availability\AvailabilitySlot;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class AvailabilitySlotTest extends TestCase
{
    public function testConstructorAndProperties(): void
    {
        $slot = new AvailabilitySlot(
            instructorId:    5,
            startDt:         '2026-04-01 09:00:00',
            endDt:           '2026-04-01 10:00:00',
            durationMinutes: 30,
            offeringId:      8,
            isBooked:        false,
            recurrenceGroup: 100,
            id:              42,
        );

        self::assertSame(5, $slot->instructorId);
        self::assertSame('2026-04-01 09:00:00', $slot->startDt);
        self::assertSame(30, $slot->durationMinutes);
        self::assertSame(8, $slot->offeringId);
        self::assertSame(100, $slot->recurrenceGroup);
        self::assertFalse($slot->isBooked);
        self::assertSame(42, $slot->id);
    }

    public function testDefaults(): void
    {
        $slot = new AvailabilitySlot(1, '2026-04-01 09:00:00', '2026-04-01 10:00:00');

        self::assertSame(60, $slot->durationMinutes);
        self::assertNull($slot->offeringId);
        self::assertFalse($slot->isBooked);
        self::assertNull($slot->recurrenceGroup);
        self::assertNull($slot->id);
    }

    public function testFromRowMapsCorrectlyAndCastsNullables(): void
    {
        $row = (object) [
            'id'               => '7',
            'instructor_id'    => '3',
            'offering_id'      => null,
            'start_dt'         => '2026-05-10 14:00:00',
            'end_dt'           => '2026-05-10 15:00:00',
            'duration_minutes' => '60',
            'is_booked'        => '1',
            'recurrence_group' => '7',
        ];

        $slot = AvailabilitySlot::fromRow($row);

        self::assertSame(7, $slot->id);
        self::assertSame(3, $slot->instructorId);
        self::assertNull($slot->offeringId);
        self::assertSame(60, $slot->durationMinutes);
        self::assertSame(7, $slot->recurrenceGroup);
        self::assertTrue($slot->isBooked);
    }

    public function testNormalizeDateTimeAcceptsCanonicalAndDatetimeLocalForms(): void
    {
        self::assertSame('2026-04-01 09:00:00', AvailabilitySlot::normalizeDateTime('2026-04-01 09:00:00'));
        self::assertSame('2026-04-01 09:00:00', AvailabilitySlot::normalizeDateTime('2026-04-01 09:00'));
        self::assertSame('2026-04-01 09:00:00', AvailabilitySlot::normalizeDateTime('2026-04-01T09:00'));
        self::assertSame('2026-04-01 09:00:30', AvailabilitySlot::normalizeDateTime('2026-04-01T09:00:30'));
    }

    public function testNormalizeDateTimeRejectsGarbageAndImpossibleDates(): void
    {
        self::assertNull(AvailabilitySlot::normalizeDateTime(''));
        self::assertNull(AvailabilitySlot::normalizeDateTime('not a date'));
        self::assertNull(AvailabilitySlot::normalizeDateTime('next tuesday'));
        self::assertNull(AvailabilitySlot::normalizeDateTime('2026-04-01'));
        self::assertNull(AvailabilitySlot::normalizeDateTime('2026-13-01 09:00:00'));
        self::assertNull(AvailabilitySlot::normalizeDateTime('2026-02-30 09:00:00'));
        self::assertNull(AvailabilitySlot::normalizeDateTime('2026-04-01 25:00:00'));
        self::assertNull(AvailabilitySlot::normalizeDateTime("2026-04-01 09:00:00'); DROP TABLE x;--"));
    }

    public function testSplitByDurationChunksWindowIntoLessonLengthSlots(): void
    {
        $window = new AvailabilitySlot(5, '2026-07-06 09:00:00', '2026-07-06 12:00:00', 60, 8);

        $slots = $window->splitByDuration();

        self::assertCount(3, $slots);
        self::assertSame('2026-07-06 09:00:00', $slots[0]->startDt);
        self::assertSame('2026-07-06 10:00:00', $slots[0]->endDt);
        self::assertSame('2026-07-06 11:00:00', $slots[2]->startDt);
        self::assertSame('2026-07-06 12:00:00', $slots[2]->endDt);

        // Each chunk keeps the window's instructor, duration, and offering.
        self::assertSame(5, $slots[1]->instructorId);
        self::assertSame(60, $slots[1]->durationMinutes);
        self::assertSame(8, $slots[1]->offeringId);
    }

    public function testSplitByDurationDropsRemainderShorterThanALesson(): void
    {
        $window = new AvailabilitySlot(5, '2026-07-06 09:00:00', '2026-07-06 16:30:00', 60);

        $slots = $window->splitByDuration();

        self::assertCount(7, $slots);
        self::assertSame('2026-07-06 16:00:00', $slots[6]->endDt);
    }

    public function testSplitByDurationReturnsEmptyWhenWindowTooShort(): void
    {
        $window = new AvailabilitySlot(5, '2026-07-06 09:00:00', '2026-07-06 09:45:00', 60);

        self::assertSame([], $window->splitByDuration());
    }

    public function testSplitByDurationHandlesThirtyMinuteLessons(): void
    {
        $window = new AvailabilitySlot(5, '2026-07-06 09:00:00', '2026-07-06 10:30:00', 30);

        $slots = $window->splitByDuration();

        self::assertCount(3, $slots);
        self::assertSame('2026-07-06 09:30:00', $slots[0]->endDt);
    }

    public function testToArrayContainsExpectedKeys(): void
    {
        $slot = new AvailabilitySlot(1, '2026-04-01 09:00:00', '2026-04-01 10:00:00', 30, 8, false, null, 10);
        $arr  = $slot->toArray();

        foreach (['id', 'instructor_id', 'offering_id', 'start_dt', 'end_dt', 'duration_minutes', 'is_booked', 'recurrence_group'] as $key) {
            self::assertArrayHasKey($key, $arr);
        }
    }
}