src/Biz/Task/Visitor/CourseItemPagingVisitor.php

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<?php

namespace Biz\Task\Visitor;

use AppBundle\Common\ArrayToolkit;
use Biz\Activity\Service\ActivityService;
use Biz\Course\Dao\CourseChapterDao;
use Biz\Task\Dao\TaskDao;
use Biz\Task\Util\TaskItemNumUtils;
use Biz\Task\Service\TaskService;
use Biz\Task\Strategy\Impl\DefaultStrategy;
use Biz\Task\Strategy\Impl\NormalStrategy;
use Codeages\Biz\Framework\Context\Biz;

class CourseItemPagingVisitor implements CourseStrategyVisitorInterface
{
    /**
     * @var Biz
     */
    private $biz;

    private $courseId;

    private $paging = array(
        'direction' => 'down',
        'limit' => 25,
        'offsetSeq' => 1,
        'offsetTaskId' => 0,
    );

    public function __construct(Biz $biz, $courseId, $paging)
    {
        $this->biz = $biz;
        $this->courseId = $courseId;

        $this->paging = array_merge($this->paging, $paging);
    }

    public function visitDefaultStrategy(DefaultStrategy $defaultStrategy)
    {
        return $this->startPaging();
    }

    public function visitNormalStrategy(NormalStrategy $normalStrategy)
    {
        return $this->startPaging();
    }

    public function startPaging()
    {
        $items = $this->findItems();

        /*
            key 为 lessonId, value 为 array(
                'lesson' => $lesson,
                'isSingleTaskLesson' => true/false,
                'taskId' => $taskId, // 单任务课时才有用
            )
        */
        $lessonInfos = array();