<?php

/**
 * File from http://PrestaShow.pl
 *
 * DISCLAIMER
 * Do not edit or add to this file if you wish to upgrade this module to newer
 * versions in the future.
 *
 *  @authors     PrestaShow.pl <kontakt@prestashow.pl>
 *  @copyright   2015 PrestaShow.pl
 *  @license     http://PrestaShow.pl/license
 */
class PShow_Xml_Parser
{

    /**
     * @var SimpleXMLElement
     */
    private $xml;

    /**
     *
     * @var array of SimpleXMLElement
     */
    protected static $instances = array();

    /**
     * Get instance of SimpleXMLElement
     *
     * @param string $filepath
     * @return SimpleXMLElement
     */
    public static function getInstance($filepath = null)
    {
        if ($filepath === null) {
            if (count(self::$instances) == 0) {
                return false;
            }

            return end(self::$instances);
        }

        $md5 = md5($filepath);

        if (!array_key_exists($md5, self::$instances)) {
            self::$instances[$md5] = new PShow_Xml_Parser();
            self::$instances[$md5]->filepath = $filepath;
        }

        return self::$instances[$md5];
    }

    public function remove_utf8_bom($text)
    {
        $bom = pack('H*', 'EFBBBF');
        $text = preg_replace("/^$bom/", '', $text);
        return $text;
    }

    /**
     * @return array
     */
    public function getElementsByPath($path)
    {
        if (is_array($path)) {
            $path = implode(',', $path) . ',';
        }

        $path = substr(str_replace(',', '/', $path), 0, strlen($path) - 1);

        $tmp = PShow_XMLReaderToSimpleXmlObjects::getInstance($this->filepath)->xpath($path);

        return $tmp;
    }

    /**
     *
     * @param string $path
     * @param SimpleXMLElement $object
     * @return array
     */
    public function getValueByPathAndObject($path, $object)
    {
        if (!is_object($object)) {
            return array();
        }

        return $object->xpath($path);
    }

    /**
     * @return SimpleXMLElement
     */
    public function countElementsByPath($path)
    {
        if (is_array($path)) {
            $path = implode(',', $path) . ',';
        }

        $path = substr(str_replace(',', '/', $path), 0, strlen($path) - 1);

        return PShow_XMLReaderToSimpleXmlObjects::getInstance($this->filepath)
                ->xpath($path, 0, null, true);
    }

    /**
     * @return SimpleXMLElement
     */
    public function getObjectsByPath($path)
    {
        if ($path === null) {
            return array();
        }

        if (is_string($path)) {
            $path = explode(',', $path);
        }

        if (!is_string($path)) {
            $path = implode('/', $path);
        }

        return PShow_XMLReaderToSimpleXmlObjects::getInstance($this->filepath)->xpath($path);
    }

    /**
     * @return SimpleXMLElement
     */
    public function getElementByPath($path, $n = null)
    {

        if (is_string($path)) {
            $path = explode(',', $path);
        }

        if (!is_string($path)) {
            $path = implode('/', $path);
        }

        if (substr($path, -1, 1) == '/') {
            $path = substr($path, 0, strlen($path) - 1);
        }

        $arr = PShow_XMLReaderToSimpleXmlObjects::getInstance($this->filepath)->xpath($path, (int) $n, 1);
        $first = reset($arr);

        if ($first) {
            return new SimpleXMLElement("<?xml version='1.0' standalone='yes'?><data>" . $first->asXML() . "</data>");
        }

        return new SimpleXMLElement("<?xml version='1.0' standalone='yes'?><data>no data</data>");
    }

    /**
     * Get all tags
     *
     * @return array
     */
    public function getAllTags()
    {
        return PShow_XMLReaderToSimpleXmlObjects::getInstance($this->filepath)->getAllTags();
    }

    /**
     * Get n object
     *
     * @param int $n
     * @return boolean
     */
    public function getObject($n = 0)
    {
        
    }

    public function getObjects($objects_path, $start_from = 0, $rows_count = 3)
    {
        $rows = array();
        $objects = $this->getElementsByPath($objects_path);

        $i = 0;

        foreach ($objects as $object) {
            ++$i;

            if ($i >= $start_from) {
                $rows[] = $this->getAllValuesFromObject($object);
            }

            if (count($rows) >= $rows_count) {
                break;
            }
        }

        return $rows;
    }

    /**
     * Get all importable values from SimpleXMLElement
     *
     * @param SimpleXMLElement $object
     * @param array $results
     * @return array
     */
    public function getAllValuesFromObject($object, $with_path = false, &$results = null, $prevPath = null, $isAttr = false)
    {
        if (!is_object($object)) {
            return;
        }

        $fTime = false;

        if ($results === null) {
            $fTime = true;
            $results = array();

            foreach ($object->attributes() as $k => $v) {
                $results[] = md5($prevPath . '@' . $k . $v);
            }
        }

        foreach ($object as $k => $v) {
            $this->getAllValuesFromObject($v->attributes(), true, $results, $prevPath . $k . '/', true);

            if ($with_path) {
                $results[] = md5($prevPath . (($isAttr) ? '@' : '') . $k . $v);
            } else {
                $results[] = (string) $v;
            }

            $this->getAllValuesFromObject($v, true, $results, $prevPath . $k . '/');
        }

        return $results;
    }
}