<?php
/**
 * Extend class to add own methods as needed
 */
class DigiMinaPerformanceLevel extends ElggObject {

	/**
	 * Set attributes as needed.
	 */
	protected function initializeAttributes() {
		parent::initializeAttributes();

		$this->attributes['subtype'] = 'dmperformancelevel';
		$this->attributes['access_id'] = ACCESS_PUBLIC;
	}

    /**
     * Returns performance level items
     * @return mixed Array, false on errors
     */
    public function getItems() {
        $options = array(
            'types' => 'object',
            'subtypes' => 'dmitem',
            'limit' => 0,
            'metadata_name_value_pairs' => array('name' => 'dmperformancelevel', 'value' => $this->guid)
        ); 
        return elgg_get_entities_from_metadata($options);
    }

    /**
     * Returns random performance level item or false
     *
     * @return mixed
     */

    public function getRandomItem() {
        $items = $this->getItems();

        if (is_array($items)) {
            if (sizeof($items)>1) {
                $random = array_rand($items, 1);
                return $items[$random];
            } else {
                return $items[0];
            }
        }
        return false;
    }

    /**
     * Returns next level from the same subcompetency if possible
     *
     * @return mixed
     */
    public function getNextPerformanceLevel() {
        $options = array(
            'types' => 'object',
            'subtypes' => 'dmperformancelevel',
            'limit' => 1,
            'container_guid' => $this->getContainerGUID(),
            'metadata_name_value_pairs' => array('name' => 'level', 'value' => ((int)$this->level + 1))
        );
        $next = elgg_get_entities_from_metadata($options);
        if (is_array($next) && sizeof($next)) {
            return $next[0];
        }
        return false;
    }

    /**
     * Returns previous level from the same subcompetency if possible
     *
     * @return mixed
     */
    public function getPreviousPerformanceLevel() {
        $options = array(
            'types' => 'object',
            'subtypes' => 'dmperformancelevel',
            'limit' => 1,
            'container_guid' => $this->getContainerGUID(),
            'metadata_name_value_pairs' => array('name' => 'level', 'value' => ((int)$this->level - 1))
        );
        $next = elgg_get_entities_from_metadata($options);
        if (is_array($next) && sizeof($next)) {
            return $next[0];
        }
        return false;
    }

}