<?php
/*
 * MODX Revolution
 *
 * Copyright 2006-2011 by MODX, LLC.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
require_once MODX_CORE_PATH . 'model/modx/transport/modpackagebuilder.class.php';

/**
 * Abstracts the package building process for XML builds
 *
 * @package modx
 * @subpackage transport
 */
class modXMLPackageBuilder extends modPackageBuilder {
    /**
     * Build the package from a specific XML file
     * @param string $fileName The XML file to parse
     * @return bool True if successful
     */
    public function build($fileName) {
        if (!$this->parseXML($fileName)) {
            $this->modx->log(modX::LOG_LEVEL_ERROR,'XML parsing failed for '.$fileName);
            return false;
        }

        /* create a new package */
        $this->createPackage($this->build['name'], $this->build['version'], $this->build['release']);
        $this->registerNamespace($this->build['namespace'],$this->build['autoincludes']);

        /* set up some attributes that define install behavior */
        $attributes= array(
            xPDOTransport::UNIQUE_KEY => 'name',
            xPDOTransport::UPDATE_OBJECT => true,
            xPDOTransport::RESOLVE_FILES => true,
            xPDOTransport::RESOLVE_PHP => true,
            xPDOTransport::PRESERVE_KEYS => false,
        );

        foreach ($this->build['vehicles'] as $signature => $vehicle) {
            $c = $this->modx->getObject($vehicle['class_key'],$vehicle['object']);
            if ($c == null) continue;

            if (!isset($vehicle['attributes'])) $vehicle['attributes'] = array();
            $attr = array_merge($attributes,$vehicle['attributes']);

            $v = $this->createVehicle($c,$attr);
            if (isset($vehicle['resolvers']) && !empty($vehicle['resolvers'])) {
                foreach ($vehicle['resolvers'] as $resolver) {
                    $v->resolve($resolver['type'],$resolver);
                }
            }
            $this->putVehicle($v);
        }

        /* zip up the package */
        $this->pack();

        return true;
    }

    /**
     * Parse the XML file
     * @param string $fileName
     * @return bool
     */
    public function parseXML($fileName) {
        $this->build = array(
            'autoincludes' => array(),
            'vehicles' => array(),
        );

        if (!is_file($fileName)) {
            $this->modx->log(xPDO::LOG_LEVEL_ERROR, "Could not find specified XML build file {$fileName}");
            return false;
        } else {
            $fileContent= @ file($fileName);
            $this->buildXML= implode('', $fileContent);
        }
        /* Create the parser and set handlers. */
        $this->xmlParser= xml_parser_create('UTF-8');

        xml_set_object($this->xmlParser, $this);
        xml_parser_set_option($this->xmlParser, XML_OPTION_CASE_FOLDING, 0);
        xml_parser_set_option($this->xmlParser, XML_OPTION_TARGET_ENCODING, 'UTF-8');
        xml_set_element_handler($this->xmlParser, '_handleOpenElement', '_handleCloseElement');
        xml_set_character_data_handler($this->xmlParser, "_handleCData");

        /* Parse it. */
        if (!xml_parse($this->xmlParser, $this->buildXML)) {
            $ln= xml_get_current_line_number($this->xmlParser);
            $msg= xml_error_string(xml_get_error_code($this->xmlParser));
            $this->modx->log(xPDO::LOG_LEVEL_ERROR, "Error parsing XML schema on line $ln: $msg");
            return false;
        }

        /* Free up the parser and clear memory */
        xml_parser_free($this->xmlParser);
        unset ($this->xmlParser);


        return $this->build;
    }

    /**
     * @param xmlParser $parser A reference to the xml parser instance
     * @param string|array $element The opening XML element
     * @param array $attributes An array of attributes on the element
     * @return void
     */
    protected function _handleOpenElement(& $parser, & $element, & $attributes) {
        $element= strtolower($element);
        switch ($element) {
            case 'component':
                while (list ($attrName, $attrValue)= each($attributes)) {
                    $this->build[$attrName]= $attrValue;
                }
                break;
            case 'autoinclude':
                while (list ($attrName, $attrValue)= each($attributes)) {
                    if ($attrName == 'class') {
                        $this->build['autoincludes'][$attrValue] = $attrValue;
                    }
                }
                break;
            case 'vehicle':
                $vehicle = array(
                    'resolvers' => array(),
                    'attributes' => array(),
                );
                while (list ($attrName, $attrValue)= each($attributes)) {
                    switch ($attrName) {
                        case 'class':
                            $vehicle['class_key'] = $attrValue;
                            break;
                        case 'id':
                            $vehicle['object'] = $attrValue;
                            break;
                        default:
                            $vehicle['attributes'][$attrName] = $attrValue;
                            break;
                    }
                }
                $this->build['vehicles'][$vehicle['class_key'].'-'.$vehicle['object']] = $vehicle;
                $this->openVehicle = $vehicle['class_key'].'-'.$vehicle['object'];
                break;
            case 'resolver':
                if ($this->openVehicle == '') break;

                $resolver = array();
                while (list ($attrName, $attrValue)= each($attributes)) {
                    $resolver[$attrName] = $attrValue;
                }
                if (isset($resolver['prependbase']) && $resolver['prependbase'] == true) {
                	$resolver['source'] = $this->modx->getOption('base_path').$resolver['source'];
                }
                $this->build['vehicles'][$this->openVehicle]['resolvers'][] = $resolver;
                break;
        }
    }

    /**
     * Handles a closed XML tag
     * @param xmlParser $parser A reference to the xml parser instance
     * @param string|array $element The closing element
     * @return void
     */
    protected function _handleCloseElement(& $parser, & $element) {
        switch ($element) {
            case 'vehicle':
                $this->openVehicle = '';
                break;
        }
    }

    /**
     * @param xmlParser $parser A reference to the xml parser instance
     * @param $data The data being wrapped in CDATA tags
     * @return void
     */
    protected function _handleCData(& $parser, & $data) {}
}