src/Biz/Testpaper/Pattern/QuestionTypePattern.php

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<?php

namespace Biz\Testpaper\Pattern;

use AppBundle\Common\ArrayToolkit;
use Codeages\Biz\Framework\Context\Biz;

class QuestionTypePattern implements TestpaperPatternInterface
{
    protected $biz;

    public function __construct(Biz $biz)
    {
        $this->biz = $biz;
    }

    public function getTestpaperQuestions($testpaper, $options)
    {
        $questions = $this->getQuestions($options);
        shuffle($questions);
        $typedQuestions = ArrayToolkit::group($questions, 'type');

        $canBuildResult = $this->canBuildWithQuestions($options, $typedQuestions);
        if ($canBuildResult['status'] == 'no') {
            return array('status' => 'error', 'missing' => $canBuildResult['missing']);
        }

        $items = array();
        foreach ($options['counts'] as $type => $needCount) {
            $needCount = intval($needCount);
            if ($needCount == 0) {
                continue;
            }

            if ($options['mode'] == 'difficulty') {
                $difficultiedQuestions = ArrayToolkit::group($typedQuestions[$type], 'difficulty');

                // 按难度百分比选取Question
                $selectedQuestions = $this->selectQuestionsWithDifficultlyPercentage($difficultiedQuestions, $needCount, $options['percentages']);

                // 选择的Question不足的话，补足
                $selectedQuestions = $this->fillQuestionsToNeedCount($selectedQuestions, $typedQuestions[$type], $needCount);

                $itemsOfType = $this->convertQuestionsToItems($testpaper, $selectedQuestions, $needCount, $options);
            } else {
                $itemsOfType = $this->convertQuestionsToItems($testpaper, $typedQuestions[$type], $needCount, $options);
            }
            $items = array_merge($items, $itemsOfType);
        }

        return array('status' => 'ok', 'items' => $items);
    }

    public function canBuild($options)
    {
        $questions = $this->getQuestions($options);
        $typedQuestions = ArrayToolkit::group($questions, 'type');

        return $this->canBuildWithQuestions($options, $typedQuestions);
    }