<?php
/**
 * DigiMinaItem class
 */
class DigiMinaItem extends ElggObject {

    /**
     * Initialize
     *
     * @return void
     */
	protected function initializeAttributes() {
		parent::initializeAttributes();
		$this->attributes['subtype'] = 'dmitem';
        $this->attributes['access_id'] = ACCESS_PUBLIC;
        $this->deleted = 0;
        $this->dmcompetencymodel = "";
        $this->dmperformancelevel = "";
	}
    
    /**
     * Build From XML
     */
    function buildFromXML($resource_dom, $item_dom) {
    }

    /**
     * Return node text content
     *
     * @param DOMNode $node Node
     *
     * @return string 
     */
    function findNodeText($node) {
        $children = $node->childNodes;
        for ($i=0; $i<$children->length; $i++) {
            $item = $children->item($i);
            if ($item->nodeType == XML_TEXT_NODE || $item->nodeType == XML_CDATA_SECTION_NODE) {
                $child_text = $children->item($i)->textContent;
                if (trim($child_text) != "") {
                    return $children->item($i)->textContent;
                }
            }

        }
        return "";
    }

    /**
     * Return item title from xml
     *
     * @param DOMDocument $item_dom Item DOM document
     *
     * @return string 
     */
    function getTitleFromXML($item_dom) {
        $assessmentItem = $item_dom->getElementsByTagName("assessmentItem")->item(0);
        return $assessmentItem->getAttribute("title");
    }

    /**
     * Return item body from xml
     *
     * @param DOMDocument $item_dom Item DOM document
     *
     * @return string 
     */
    function getItemBodyFromXML($item_dom) {
        $item_body = $item_dom->getElementsByTagName("itemBody")->item(0);
        $children = $item_body->childNodes;
        for ($i=0; $i<$children->length; $i++) {
            $item = $children->item($i);
            if ($item->nodeType != XML_TEXT_NODE && $item->nodeType != XML_CDATA_SECTION_NODE) {
                return $children->item($i)->textContent;
            }
        }
        return "";
    }

    /**
     * Checks can this item be connected with performance level
     * Each performance item can have only one extendedText item or multiple automatic response items
     *
     * @param int $performance_level_guid
     *
     * @return bool
     */
    function is_connectable_with_performance_level($performance_level_guid) {
        if ($this->itemtype == "extendedText") {
            $items = digimina_get_performance_level_items($performance_level_guid);
        } else {
            $options = array(
                "types" => "object",
                "subtypes" => "dmitem",
                "limit" => 0, 
                "metadata_name_value_pairs" => array(array("name" => "itemtype", "value" => "extendedText"), array("name" => "dmperformancelevel", "value" => $performance_level_guid))
             );
            $items = elgg_get_entities_from_metadata($options);
        }
        if (count($items) > 0) {
            return false;
        }
        return true;
    }

    /**
     * Detects if current item type allows automated testing
     *
     * @return bool
     */
    public function detectAutomatedTesting() {
        if (in_array($this->itemtype, array('multipleChoice', 'multipleResponse'))) {
            return true;
        }
        return false;

    }

    /**
     * Returns true or false based on given answer
     *
     * @param mixed $answer User answer
     * @return bool
     *
     */
    function answer($answer) {
        if (in_array($this->itemtype, array("multipleChoice", "multipleResponse"))) {
            if ($answer == $this->correct) {
                return true;
            }
            return false;
        }
        return true;
    }

}