<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Availability;

use Mockery;
use Unsupervised\Schedular\Availability\AvailabilitySlot;
use Unsupervised\Schedular\Availability\WindowValidator;
use Unsupervised\Schedular\Offering\Offering;
use Unsupervised\Schedular\Offering\OfferingRepository;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class WindowValidatorTest extends TestCase
{
    private OfferingRepository&Mockery\MockInterface $offerings;
    private WindowValidator $validator;

    protected function setUp(): void
    {
        parent::setUp();

        $this->offerings = Mockery::mock(OfferingRepository::class);
        $this->validator = new WindowValidator($this->offerings);
    }

    /**
     * The reported bug: 5:30–6:00 PM submitted with the length select left on
     * its 60-minute default. The window fits no lesson, so it used to persist
     * nothing at all and say nothing.
     */
    public function testRejectsAWindowShorterThanTheLessonLength(): void
    {
        $result = $this->validator->validate(3, '2026-09-10 17:30', '2026-09-10 18:00', 60, 0);

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invalid_window', $result->get_error_code());
        // The message names the length actually chosen, so the fix is obvious.
        self::assertStringContainsString('60-minute', $result->get_error_message());
    }

    public function testAcceptsThatSameWindowAtAFittingLessonLength(): void
    {
        $result = $this->validator->validate(3, '2026-09-10 17:30', '2026-09-10 18:00', 30, 0);

        self::assertInstanceOf(AvailabilitySlot::class, $result);
        self::assertSame('2026-09-10 17:30:00', $result->startDt);
        self::assertSame('2026-09-10 18:00:00', $result->endDt);
        self::assertSame(30, $result->durationMinutes);
        self::assertNull($result->offeringId);
        self::assertCount(1, $result->splitByDuration());
    }

    /** @return array<string, array{string, string}> */
    public static function badDateTimes(): array
    {
        return [
            'empty start'        => ['', '2026-09-10 18:00'],
            'empty end'          => ['2026-09-10 17:00', ''],
            'unparseable start'  => ['tomorrow', '2026-09-10 18:00'],
            'unparseable end'    => ['2026-09-10 17:00', 'not a date'],
        ];
    }

    /** @dataProvider badDateTimes */
    public function testRejectsUnusableDateTimes(string $start, string $end): void
    {
        $result = $this->validator->validate(3, $start, $end, 30, 0);

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invalid_datetime', $result->get_error_code());
    }

    public function testRejectsAnEndAtOrBeforeTheStart(): void
    {
        $backwards = $this->validator->validate(3, '2026-09-10 18:00', '2026-09-10 17:00', 30, 0);
        $identical = $this->validator->validate(3, '2026-09-10 18:00', '2026-09-10 18:00', 30, 0);

        self::assertInstanceOf(\WP_Error::class, $backwards);
        self::assertInstanceOf(\WP_Error::class, $identical);
        self::assertSame('invalid_datetime', $backwards->get_error_code());
        self::assertSame('invalid_datetime', $identical->get_error_code());
    }

    public function testRejectsAWindowSpanningTwoDays(): void
    {
        $result = $this->validator->validate(3, '2026-09-10 23:00', '2026-09-11 01:00', 30, 0);

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invalid_window', $result->get_error_code());
        self::assertStringContainsString('same day', $result->get_error_message());
    }

    public function testRejectsAnOfferingOwnedBySomeoneElse(): void
    {
        // Instructor 3 posting instructor 9's offering: accepting it would let a
        // slot inherit another instructor's price and payment routing.
        $this->offerings->shouldReceive('findById')->once()->with(8)
            ->andReturn(new Offering(instructorId: 9, title: 'Theirs', kind: Offering::KIND_PRIVATE_LESSON, id: 8));

        $result = $this->validator->validate(3, '2026-09-10 17:00', '2026-09-10 18:00', 60, 8);

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invalid_offering', $result->get_error_code());
    }

    public function testRejectsAnOfferingThatDoesNotExist(): void
    {
        $this->offerings->shouldReceive('findById')->once()->with(8)->andReturn(null);

        $result = $this->validator->validate(3, '2026-09-10 17:00', '2026-09-10 18:00', 60, 8);

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invalid_offering', $result->get_error_code());
    }

    public function testKeepsAnOfferingTheInstructorOwns(): void
    {
        $this->offerings->shouldReceive('findById')->once()->with(8)
            ->andReturn(new Offering(instructorId: 3, title: 'Mine', kind: Offering::KIND_PRIVATE_LESSON, id: 8));

        $result = $this->validator->validate(3, '2026-09-10 17:00', '2026-09-10 18:00', 60, 8);

        self::assertInstanceOf(AvailabilitySlot::class, $result);
        self::assertSame(8, $result->offeringId);
    }

    public function testFallsBackToTheDefaultLessonLength(): void
    {
        $result = $this->validator->validate(3, '2026-09-10 09:00', '2026-09-10 10:00', 0, 0);

        self::assertInstanceOf(AvailabilitySlot::class, $result);
        self::assertSame(AvailabilitySlot::DEFAULT_DURATION_MINUTES, $result->durationMinutes);
    }

    public function testAcceptsTheDatetimeLocalFormTheFormActuallySubmits(): void
    {
        // The browser posts `Y-m-d\TH:i`, not the canonical space-separated form.
        $result = $this->validator->validate(3, '2026-09-10T17:00', '2026-09-10T18:00', 60, 0);

        self::assertInstanceOf(AvailabilitySlot::class, $result);
        self::assertSame('2026-09-10 17:00:00', $result->startDt);
    }
}