<?php namespace GermanAirlinesVa\Schooling\Models;

use Model;

/**
 * Model
 */
class ExamTyperating extends Model
{
  use \October\Rain\Database\Traits\Validation;

  /*
   * Disable timestamps by default.
   * Remove this line if timestamps are defined in the database table.
   */
  public $timestamps = false;

  /**
   * @var string The database table used by the model.
   */
  public $table = 'exams';
  protected $connection = 'germanairlinesva_schooling';

  /**
   * @var array Validation rules
   */
  public $rules = [
    'member_id' => 'required',
    'typerating_id' => 'required',
  ];

  public $belongsTo = [
    'typerating' => 'GermanAirlinesVa\Schooling\Models\Typerating',
    'member' => 'GermanAirlinesVa\Social\Models\Member',
  ];

  public $belongsToMany = [
    'exam_questions' => [
      'GermanAirlinesVa\Schooling\Models\ExamTyperatingQuestion',
      'table' => 'exam_exam_answer_exam_question',
      'key' => 'exam_id',
      'otherKey' => 'exam_question_id',
    ],
    'exam_answers' => [
      'GermanAirlinesVa\Schooling\Models\ExamTyperatingAnswer',
      'table' => 'exam_exam_answer_exam_question',
      'key' => 'exam_id',
      'otherKey' => 'exam_answer_id',
    ],
  ];

  /**
   * The "booting" method of the model.
   *
   * @return void
   */
  protected static function boot()
  {
    parent::boot();

    static::addGlobalScope('exam_typerating_typerating_id', function ($builder) {
      $builder->where('typerating_id', '<>', null);
    });
  }

  public static function createNew($member_id, $typerating_id)
  {
    $exam = new ExamTyperating();
    $exam->member_id = $member_id;
    $exam->typerating_id = $typerating_id;

    $entry = [];
    $questions = ExamTyperatingQuestion::where('typerating_id', $typerating_id)
      ->get()
      ->random(10);
    foreach ($questions as $question) {
      array_push($entry, ['exam_question_id' => $question->id]);
    }

    $exam->exam_questions = $entry;
    $exam->save();
  }

  public function grade()
  {
    $this->load([
      'exam_questions' => function ($query) {
        $query->groupBy('id');
      },
    ]);
    $returnVal = [];
    $returnGrade = 0;
    foreach ($this->exam_questions as $question) {
      $answers = $question->exam_answers;
      $returnAnswers = [];
      $returnAnswerGrade = true;
      foreach ($answers as $answer) {
        $given = $this->exam_answers->contains($answer->id);
        array_push($returnAnswers, [
          'answer' => $answer,
          'status' => $given,
          'grade' => $given == $answer->is_correct,
        ]);
        $returnAnswerGrade = $returnAnswerGrade && $given == $answer->is_correct;
      }
      array_push($returnVal, [
        'question' => $question,
        'answers' => $returnAnswers,
        'grade' => $returnAnswerGrade,
      ]);
      $returnGrade = $returnAnswerGrade ? $returnGrade + 1 : $returnGrade;
    }
    return ['exam' => $returnVal, 'grade' => $returnGrade];
  }
}