class Group extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'course_id',
        'name',
        'type',
    ];

    protected $casts = [
        'type' => GroupType::class,
        'lecturer_type' => 'array',
    ];

    public function course()
    {
        return $this->belongsTo(Course::class);
    }

    public function lecturers()
    {
        return $this->belongsToMany(Lecturer::class)
            ->withPivot(['lecturer_type']);
    }
}

class Group extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'course_id',
        'name',
        'type',
    ];

    protected $casts = [
        'type' => GroupType::class,
        'lecturer_type' => 'array',
    ];

    public function course()
    {
        return $this->belongsTo(Course::class);
    }

    public function lecturers()
    {
        return $this->belongsToMany(Lecturer::class)
            ->withPivot(['lecturer_type']);
    }
}

class Lecturer extends Model
{
    use HasFactory, SoftDeletes, HasTranslations;

    public $translatable = [
        'first_name',
        'last_name',
        'father_name',
        'position'
    ];

    protected $fillable = [
        'chair_id',
        'first_name',
        'last_name',
        'father_name',
        'position',
        'photo',
    ];

    public function chair()
    {
        return $this->belongsTo(Chair::class);
    }

    public function groups()
    {
        return $this->belongsToMany(Group::class)
            ->withPivot(['lecturer_type']);
    }
}

class Lecturer extends Model
{
    use HasFactory, SoftDeletes, HasTranslations;

    public $translatable = [
        'first_name',
        'last_name',
        'father_name',
        'position'
    ];

    protected $fillable = [
        'chair_id',
        'first_name',
        'last_name',
        'father_name',
        'position',
        'photo',
    ];

    public function chair()
    {
        return $this->belongsTo(Chair::class);
    }

    public function groups()
    {
        return $this->belongsToMany(Group::class)
            ->withPivot(['lecturer_type']);
    }
}