<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\GroupClass;

use Brain\Monkey\Functions;
use Mockery;
use Unsupervised\Schedular\GroupClass\EnrollmentEndpoint;
use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
use Unsupervised\Schedular\Offering\Offering;
use Unsupervised\Schedular\Offering\OfferingRepository;
use Unsupervised\Schedular\Payment\Payment;
use Unsupervised\Schedular\Payment\PaymentService;
use Unsupervised\Schedular\Registration\RegistrationGate;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class EnrollmentEndpointTest extends TestCase
{
    private EnrollmentRepository $enrollments;
    private OfferingRepository $offerings;
    private RegistrationGate $gate;
    private PaymentService $payments;
    private GroupAccessRepository $access;
    private EnrollmentEndpoint $endpoint;

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

        Functions\when('absint')->alias(static fn ($v): int => abs((int) $v));
        Functions\when('wp_unslash')->returnArg();
        Functions\when('sanitize_text_field')->returnArg();
        Functions\when('get_current_user_id')->justReturn(5);
        Functions\when('current_time')->justReturn('2026-07-24');

        $this->enrollments = Mockery::mock(EnrollmentRepository::class);
        $this->offerings   = Mockery::mock(OfferingRepository::class);
        $this->gate        = Mockery::mock(RegistrationGate::class);
        $this->payments    = Mockery::mock(PaymentService::class);
        $this->access      = Mockery::mock(GroupAccessRepository::class);

        $this->endpoint = new EnrollmentEndpoint(
            $this->enrollments,
            $this->offerings,
            $this->gate,
            $this->payments,
            $this->access,
        );
    }

    private function offering(float $price): Offering
    {
        return new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', price: $price, id: 8);
    }

    private function inviteOnlyOffering(): Offering
    {
        return new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Private Choir', accessMode: Offering::ACCESS_INVITE_ONLY, id: 8);
    }

    private function expectSuccessfulEnrollment(): void
    {
        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
        $this->enrollments->shouldReceive('countActiveForOffering')->never();
        $this->gate->shouldReceive('validate')->andReturn(null);
        $this->enrollments->shouldReceive('insert')->once()->andReturn(44);
        $this->gate->shouldReceive('record')->once();
    }

    public function testEnrollInFreeClassReturnsNullPayment(): void
    {
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->offering(0.0));
        $this->expectSuccessfulEnrollment();
        $this->payments->shouldNotReceive('createForRegistration');

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_REST_Response::class, $result);
        self::assertSame(201, $result->get_status());
        self::assertSame(44, $result->get_data()['id']);
        self::assertNull($result->get_data()['payment']);
    }

    public function testEnrollInPricedClassReturnsPaymentSummary(): void
    {
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->offering(120.0));
        $this->expectSuccessfulEnrollment();
        $this->payments->shouldReceive('createForRegistration')
            ->once()
            ->with(Payment::REG_ENROLLMENT, 44, 5, 3, 120.0, 'CAD', null)
            ->andReturn(new Payment(
                studentId:        5,
                instructorId:     3,
                registrationType: Payment::REG_ENROLLMENT,
                registrationId:   44,
                amount:           120.0,
                method:           Payment::METHOD_ETRANSFER,
                status:           Payment::STATUS_PENDING,
                id:               12,
            ));

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_REST_Response::class, $result);
        self::assertSame(
            ['id' => 12, 'method' => Payment::METHOD_ETRANSFER, 'status' => Payment::STATUS_PENDING],
            $result->get_data()['payment']
        );
    }

    public function testScheduledBillingEnrollmentDefersPayment(): void
    {
        // A monthly group class is billed later by the daily scan, so enrolment
        // succeeds with no payment created now.
        $offering = new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', price: 120.0, billingMode: Offering::BILLING_MONTHLY, id: 8);
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($offering);
        $this->expectSuccessfulEnrollment();
        $this->payments->shouldNotReceive('createForRegistration');

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_REST_Response::class, $result);
        self::assertSame(201, $result->get_status());
        self::assertNull($result->get_data()['payment']);
    }

    public function testRejectsEnrollmentAfterExplicitDeadline(): void
    {
        // current_time is stubbed to 2026-07-24, past the 2026-07-10 deadline.
        $offering = new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', termStart: '2026-07-01', enrollmentDeadline: '2026-07-10', id: 8);
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($offering);
        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
        $this->enrollments->shouldReceive('insert')->never();

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('enrollment_closed', $result->get_error_code());
        self::assertSame(403, $result->error_data['enrollment_closed']['status']);
    }

    public function testRejectsEnrollmentAfterDefaultDeadlineOfFirstClassDay(): void
    {
        // No explicit deadline, so it defaults to term_start (the first class day),
        // which is in the past relative to the stubbed 2026-07-24 "today".
        $offering = new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', termStart: '2026-07-20', id: 8);
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($offering);
        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
        $this->enrollments->shouldReceive('insert')->never();

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

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

    public function testInviteOnlyClassRejectsStudentWithoutGrant(): void
    {
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
        $this->access->shouldReceive('hasGrant')->with(8, 5)->andReturn(false);
        $this->enrollments->shouldReceive('insert')->never();

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_Error::class, $result);
        self::assertSame('invite_required', $result->get_error_code());
        self::assertSame(403, $result->error_data['invite_required']['status']);
    }

    public function testInviteOnlyClassAllowsGrantedStudentAndMarksEnrolled(): void
    {
        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
        $this->access->shouldReceive('hasGrant')->with(8, 5)->andReturn(true);
        $this->expectSuccessfulEnrollment();
        $this->access->shouldReceive('markEnrolled')->once()->with(8, 5);

        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));

        self::assertInstanceOf(\WP_REST_Response::class, $result);
        self::assertSame(201, $result->get_status());
    }
}