CourseWork/app/Services/StudentService.php

<?php

namespace App\Services;

use App\Enums\ScoreEnum;
use App\Models\Student;
use App\Models\Subject;
use App\Models\User;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\Auth;

class StudentService
{
    public function create(array $data): Student
    {
        $user = User::create([
            'email' => $data['email'],
            'password' => $data['password'],
        ]);
        $student = Student::create([
            'name' => $data['name'],
            'last_name' => $data['last_name'],
            'middle_name' => $data['middle_name'],
            'birthday' => $data['birthday'],
            'grade_id' => $data['grade_id'],
        ]);
        $student->user()->save($user);
        $student
            ->lessons()
            ->syncWithPivotValues($student->grade->lessons->pluck('id')->all(), ['score' => ScoreEnum::WithoutScore]);

        return $student;
    }

    public function update(Student $student, array $data): Student
    {
        $student->user()->update([
            'email' => $data['email'],
            'password' => $data['password'],
        ]);

        $student->update([
            'name' => $data['name'],
            'last_name' => $data['last_name'],
            'middle_name' => $data['middle_name'],
            'birthday' => $data['birthday'],
            'grade_id' => $data['grade_id'],
        ]);

        return $student;
    }

    public function delete($model): void
    {
        $model->user()->delete();
        $model->delete();
    }

    public function getScores(Subject $subject): Collection
    {
        $student = Auth::user()->userable;

        return $student->lessons()->where('subject_id', $subject->id)->get();
    }

    public function getAvgScore(Subject $subject)
    {
        $student = Auth::user()->userable;
        $scores = $student
            ->lessons()
            ->where('subject_id', $subject->id)
            ->whereIn('score', ScoreEnum::getNumScores())
            ->pluck('score');

        return round($scores->avg(), 2);
    }

    public function getDebts(): Collection
    {
        $student = Auth::user()->userable;

        return $student->lessons()->whereIn('score', ScoreEnum::getDebtScores())->get();
    }

    public function exportAvgScores()
    {
        $subjects = Auth::user()->userable->grade->subjects;
        $avgScores = collect();

        $subjects->each(function ($subject) use ($avgScores) {
            $avgScores->put($subject->name, $this->getAvgScore($subject));
        });

        return Pdf::loadView('students.avg-scores', [
            'avgScores' => $avgScores,
        ])->download('Успеваемость.pdf');
    }
}