<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Auth;

use Brain\Monkey\Functions;
use Mockery;
use Unsupervised\Schedular\Auth\InstructorNotificationMailer;
use Unsupervised\Schedular\Auth\InstructorNotificationPref;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class InstructorNotificationMailerTest extends TestCase
{
    private InstructorNotificationPref&Mockery\MockInterface $pref;

    protected function setUp(): void
    {
        parent::setUp();
        $this->pref = Mockery::mock(InstructorNotificationPref::class);
    }

    private function mailer(): InstructorNotificationMailer
    {
        return new InstructorNotificationMailer($this->pref);
    }

    private function instructor(string $email): \WP_User
    {
        $user             = Mockery::mock(\WP_User::class);
        $user->user_email = $email;

        return $user;
    }

    public function testLessonNoticeGoesToAnOptedInInstructor(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(true);
        Functions\when('get_userdata')->justReturn($this->instructor('teacher@studio.test'));

        Functions\expect('wp_mail')
            ->once()
            ->with(
                'teacher@studio.test',
                Mockery::on(static fn (string $subject): bool => str_contains($subject, '30 min piano')),
                Mockery::on(static fn (string $body): bool => str_contains($body, 'Ada') && str_contains($body, 'Jul 1'))
            )
            ->andReturn(true);

        self::assertTrue($this->mailer()->notifyLessonBooked(9, 'Ada', '30 min piano', 'Jul 1, 2026 10:00 AM'));
    }

    public function testWeeklyLessonNoticeCountsTheOccurrences(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(true);
        Functions\when('get_userdata')->justReturn($this->instructor('teacher@studio.test'));

        Functions\expect('wp_mail')
            ->once()
            ->with(
                'teacher@studio.test',
                Mockery::type('string'),
                Mockery::on(static fn (string $body): bool => str_contains($body, '3 weekly lessons'))
            )
            ->andReturn(true);

        self::assertTrue($this->mailer()->notifyLessonBooked(9, 'Ada', '30 min piano', 'Jul 1, 2026 10:00 AM', 3));
    }

    public function testEnrollmentNoticeGoesToAnOptedInInstructor(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(true);
        Functions\when('get_userdata')->justReturn($this->instructor('teacher@studio.test'));

        Functions\expect('wp_mail')
            ->once()
            ->with(
                'teacher@studio.test',
                Mockery::on(static fn (string $subject): bool => str_contains($subject, 'Choir')),
                Mockery::on(static fn (string $body): bool => str_contains($body, 'Ada') && str_contains($body, 'Choir'))
            )
            ->andReturn(true);

        self::assertTrue($this->mailer()->notifyEnrollment(9, 'Ada', 'Choir'));
    }

    public function testSendsNothingWhenTheInstructorHasNotOptedIn(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(false);
        // Not even a user lookup: the preference is the first gate.
        Functions\expect('get_userdata')->never();
        Functions\expect('wp_mail')->never();

        self::assertFalse($this->mailer()->notifyLessonBooked(9, 'Ada', '30 min piano', 'Jul 1, 2026 10:00 AM'));
        self::assertFalse($this->mailer()->notifyEnrollment(9, 'Ada', 'Choir'));
    }

    public function testSendsNothingWhenTheInstructorAccountIsGone(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(true);
        Functions\when('get_userdata')->justReturn(false);
        Functions\expect('wp_mail')->never();

        self::assertFalse($this->mailer()->notifyEnrollment(9, 'Ada', 'Choir'));
    }

    public function testSendsNothingWhenTheInstructorHasNoEmail(): void
    {
        $this->pref->shouldReceive('wants')->with(9)->andReturn(true);
        Functions\when('get_userdata')->justReturn($this->instructor(''));
        Functions\expect('wp_mail')->never();

        self::assertFalse($this->mailer()->notifyLessonBooked(9, 'Ada', '30 min piano', 'Jul 1, 2026 10:00 AM'));
    }
}