<?php

/**
 * MessageSource_XLIFF class file.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the BSD License.
 *
 * Copyright(c) 2004 by Qiang Xue. All rights reserved.
 *
 * To contact the author write to {@link mailto:qiang.xue@gmail.com Qiang Xue}
 * The latest version of PRADO can be obtained from:
 * {@link http://prado.sourceforge.net/}
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version $Revision: 1.8 $  $Date: 2005/12/17 06:11:28 $
 * @package System.I18N.core
 */

/**
 * Get the MessageSource class file.
 */
require_once(dirname(__FILE__).'/MessageSource.php');

/**
 * MessageSource_XLIFF class.
 *
 * Using XML XLIFF format as the message source for translation.
 * Details and example of XLIFF can be found in the following URLs.
 *
 * # http://www.opentag.com/xliff.htm
 * # http://www-106.ibm.com/developerworks/xml/library/x-localis2/
 *
 * See the MessageSource::factory() method to instantiate this class.
 *
 * @author Xiang Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version v1.0, last update on Fri Dec 24 16:18:44 EST 2004
 * @package System.I18N.core
 */
class MessageSource_XLIFF extends MessageSource
{
	/**
	 * Message data filename extension.
	 * @var string
	 */
	protected $dataExt = '.xml';

	/**
	 * Separator between culture name and source.
	 * @var string
	 */
	protected $dataSeparator = '.';

	/**
	 * Constructor.
	 * @param string the directory where the messages are stored.
	 * @see MessageSource::factory();
	 */
	function __construct($source)
	{
		$this->source = (string)$source;
	}

	/**
	 * Load the messages from a XLIFF file.
	 * @param string XLIFF file.
	 * @return array of messages.
	 */
	protected function &loadData($filename)
	{
		//load it.
		if(false === ($XML = simplexml_load_file($filename))) {
			return false;
		}

		$translationUnit = $XML->xpath('//trans-unit');

		$translations = array();

		foreach($translationUnit as $unit)
		{
			$source = (string)$unit->source;
			$translations[$source][] = (string)$unit->target;
			$translations[$source][] = (string)$unit['id'];
			$translations[$source][] = (string)$unit->note;
		}

		return $translations;
	}

	/**
	 * Get the last modified unix-time for this particular catalogue+variant.
	 * Just use the file modified time.
	 * @param string catalogue+variant
	 * @return int last modified in unix-time format.
	 */
	protected function getLastModified($source)
	{
		return is_file($source) ? filemtime($source) : 0;
	}

	/**
	 * Get the XLIFF file for a specific message catalogue and cultural
	 * vairant.
	 * @param string message catalogue
	 * @return string full path to the XLIFF file.
	 */
	protected function getSource($variant)
	{
		return $this->source.'/'.$variant;
	}

	/**
	 * Determin if the XLIFF file source is valid.
	 * @param string XLIFF file
	 * @return boolean true if valid, false otherwise.
	 */
	protected function isValidSource($source)
	{
		return is_file($source);
	}

	/**
	 * Get all the variants of a particular catalogue.
	 * @param string catalogue name
	 * @return array list of all variants for this catalogue.
	 */
	protected function getCatalogueList($catalogue)
	{
		$variants = explode('_',$this->culture);
		$source = $catalogue.$this->dataExt;
		$catalogues = array($source);
		$variant = null;

		for($i = 0, $k = count($variants); $i < $k; ++$i)
		{
			if(isset($variants[$i]{0}))
			{
				$variant .= ($variant)?'_'.$variants[$i]:$variants[$i];
				$catalogues[] = $catalogue.$this->dataSeparator.$variant.$this->dataExt;
			}
		}

		$byDir = $this->getCatalogueByDir($catalogue);
		$catalogues = array_merge($byDir,array_reverse($catalogues));
		$files = array();

		foreach($catalogues as $file)
		{
			$files[] = $file;
			$files[] = preg_replace('/\.xml$/', '.xlf', $file);
		}

		return $files;
	}

	/**
	 * Traverse through the directory structure to find the catalogues.
	 * This should only be called by getCatalogueList()
	 * @param string a particular catalogue.
	 * @return array a list of catalogues.
	 * @see getCatalogueList()
	 */
	private function getCatalogueByDir($catalogue)
	{
		$variants = explode('_',$this->culture);
		$catalogues = array();
		$variant = null;

		for($i = 0, $k = count($variants); $i < $k; ++$i)
		{
			if(isset($variants[$i]{0}))
			{
				$variant .= ($variant)?'_'.$variants[$i]:$variants[$i];
				$catalogues[] = $variant.'/'.$catalogue.$this->dataExt;
			}
		}

		return array_reverse($catalogues);
	}

	/**
	 * Returns a list of catalogue and its culture ID.
	 * E.g. array('messages','en_AU')
	 * @return array list of catalogues
	 * @see getCatalogues()
	 */
	public function catalogues()
	{
		return $this->getCatalogues();
	}

	/**
	 * Returns a list of catalogue and its culture ID. This takes care
	 * of directory structures.
	 * E.g. array('messages','en_AU')
	 * @return array list of catalogues
	 */
	protected function getCatalogues($dir=null,$variant=null)
	{
		$dir = $dir?$dir:$this->source;
		$files = scandir($dir);
		$catalogue = array();

		foreach($files as $file)
		{
			if(is_dir($dir.'/'.$file) && preg_match('/^[a-z]{2}(_[A-Z]{2,3})?$/',$file)) {
				$catalogue = array_merge(
					$catalogue,
					$this->getCatalogues($dir.'/'.$file, $file)
				);
			}

			$pos = strpos($file,$this->dataExt);
			if($pos >0 && substr($file, -1*strlen($this->dataExt)) == $this->dataExt)
			{
				$name = substr($file,0,$pos);
				$dot = strrpos($name,$this->dataSeparator);
				$culture = $variant;
				$cat = $name;

				if(is_int($dot))
				{
					$culture = substr($name, $dot+1, strlen($name));
					$cat = substr($name, 0, $dot);
				}

				$details[0] = $cat;
				$details[1] = $culture;
				$catalogue[] = $details;
			}
		}
		sort($catalogue);
		return $catalogue;
	}

	/**
	 * Get the variant for a catalogue depending on the current culture.
	 * @param string catalogue
	 * @return string the variant.
	 * @see save()
	 * @see update()
	 * @see delete()
	 */
	private function getVariants($catalogue='messages')
	{
		if($catalogue === null) {
			$catalogue = 'messages';
		}

		foreach($this->getCatalogueList($catalogue) as $variant)
		{
			$file = $this->getSource($variant);
			if(is_file($file)) {
				return array($variant, $file);
			}
		}
		return false;
	}

	/**
	 * Save the list of untranslated blocks to the translation source.
	 * If the translation was not found, you should add those
	 * strings to the translation source via the <b>append()</b> method.
	 * @param string the catalogue to add to
	 * @return boolean true if saved successfuly, false otherwise.
	 */
	public function save($catalogue='messages')
	{
		$messages = $this->untranslated;
		if(count($messages) <= 0) {
			return false;
		}

		$variants = $this->getVariants($catalogue);

		if($variants) {
			list($variant, $filename) = $variants;
		} else {
			list($variant, $filename) = $this->createMessageTemplate($catalogue);
		}

		if(is_writable($filename) == false) {
			throw new TIOException("Unable to save to file {$filename}, file must be writable.");
		}

		//create a new dom, import the existing xml
		$dom = new DOMDocument();
		$dom->load($filename);

		//find the body element
		$xpath = new DomXPath($dom);
    	$body = $xpath->query('//body')->item(0);

		$lastNodes = $xpath->query('//trans-unit[last()]');
		if(($last=$lastNodes->item(0))!==null) {
			$count = (int)$last->getAttribute('id');
		} else {
			$count = 0;
		}

		//for each message add it to the XML file using DOM
		foreach($messages as $message)
		{
			$unit = $dom->createElement('trans-unit');
			$unit->setAttribute('id',++$count);

			$source = $dom->createElement('source');
			$source->appendChild($dom->createCDATASection($message));

			$target = $dom->createElement('target');
			$target->appendChild($dom->createCDATASection(''));

			$unit->appendChild($dom->createTextNode("\n"));
			$unit->appendChild($source);
			$unit->appendChild($dom->createTextNode("\n"));
			$unit->appendChild($target);
			$unit->appendChild($dom->createTextNode("\n"));

			$body->appendChild($dom->createTextNode("\n"));
			$body->appendChild($unit);
			$body->appendChild($dom->createTextNode("\n"));
		}


		$fileNode = $xpath->query('//file')->item(0);
		$fileNode->setAttribute('date', @date('Y-m-d\TH:i:s\Z'));

		//save it and clear the cache for this variant
		$dom->save($filename);
		if(!empty($this->cache)) {
			$this->cache->clean($variant, $this->culture);
		}

		return true;
	}

	/**
	 * Update the translation.
	 * @param string the source string.
	 * @param string the new translation string.
	 * @param string comments
	 * @param string the catalogue to save to.
	 * @return boolean true if translation was updated, false otherwise.
	 */
	public function update($text, $target, $comments, $catalogue='messages')
	{
		$variants = $this->getVariants($catalogue);

		if($variants) {
			list($variant, $filename) = $variants;
		} else {
			return false;
		}

		if(is_writable($filename) == false) {
			throw new TIOException("Unable to update file {$filename}, file must be writable.");
		}

		//create a new dom, import the existing xml
		$dom = DOMDocument::load($filename);

		//find the body element
		$xpath = new DomXPath($dom);
		$units = $xpath->query('//trans-unit');

		//for each of the existin units
		foreach($units as $unit)
		{
			$found = false;
			$targetted = false;
			$commented = false;

			//in each unit, need to find the source, target and comment nodes
			//it will assume that the source is before the target.
			foreach($unit->childNodes as $node)
			{
				//source node
				if($node->nodeName == 'source' && $node->firstChild->wholeText == $text) {
					$found = true;
				}

				//found source, get the target and notes
				if($found)
				{
					//set the new translated string
					if($node->nodeName == 'target')
					{
						$node->nodeValue = $target;
						$targetted = true;
					}

					//set the notes
					if(!empty($comments) && $node->nodeName == 'note')
					{
						$node->nodeValue = $comments;
						$commented = true;
					}
				}
			}

			//append a target
			if($found && !$targetted) {
				$unit->appendChild($dom->createElement('target',$target));
			}

			//append a note
			if($found && !$commented && !empty($comments)) {
				$unit->appendChild($dom->createElement('note',$comments));
			}

			//finished searching
			if($found) {
				break;
			}
		}

		$fileNode = $xpath->query('//file')->item(0);
		$fileNode->setAttribute('date', @date('Y-m-d\TH:i:s\Z'));

		if($dom->save($filename) >0)
		{
			if(!empty($this->cache)) {
				$this->cache->clean($variant, $this->culture);
			}

			return true;
		}

		return false;
	}

	/**
	 * Delete a particular message from the specified catalogue.
	 * @param string the source message to delete.
	 * @param string the catalogue to delete from.
	 * @return boolean true if deleted, false otherwise.
	 */
	public function delete($message, $catalogue='messages')
	{
		$variants = $this->getVariants($catalogue);
		if($variants) {
			list($variant, $filename) = $variants;
		} else {
			return false;
		}

		if(is_writable($filename) == false) {
			throw new TIOException("Unable to modify file {$filename}, file must be writable.");
		}

		//create a new dom, import the existing xml
		$dom = DOMDocument::load($filename);

		//find the body element
		$xpath = new DomXPath($dom);
		$units = $xpath->query('//trans-unit');

		//for each of the existin units
		foreach($units as $unit)
		{
			//in each unit, need to find the source, target and comment nodes
			//it will assume that the source is before the target.
			foreach($unit->childNodes as $node)
			{
				//source node
				if($node->nodeName == 'source' && $node->firstChild->wholeText == $message)
				{
					//we found it, remove and save the xml file.
					$unit->parentNode->removeChild($unit);
					$fileNode = $xpath->query('//file')->item(0);
					$fileNode->setAttribute('date', @date('Y-m-d\TH:i:s\Z'));

					if(false !== $dom->save($filename)) {
						if(!empty($this->cache)) {
							$this->cache->clean($variant, $this->culture);
						}
						return true;
					}

					return false;
				}
			}
		}

		return false;
	}

	protected function createMessageTemplate($catalogue)
	{
		if($catalogue === null) {
			$catalogue = 'messages';
		}
		
		$variants = $this->getCatalogueList($catalogue);
		$variant = array_shift($variants);
		$file = $this->getSource($variant);
		$dir = dirname($file);

		if(!is_dir($dir)) {
			@mkdir($dir);
			@chmod($dir,PRADO_CHMOD);
		}

		if(!is_dir($dir)) {
			throw new TException("Unable to create directory $dir");
		}
		
		file_put_contents($file, $this->getTemplate($catalogue));
		chmod($file, PRADO_CHMOD);

		return array($variant, $file);
	}

	protected function getTemplate($catalogue)
	{
		$date = @date('c');
		$xml = <<<EOD
<?xml version="1.0" encoding="UTF-8"?>
<xliff version="1.0">
 <file source-language="EN" target-language="{$this->culture}" datatype="plaintext" original="$catalogue" date="$date" product-name="$catalogue">
  <body>
  </body>
 </file>
</xliff>
EOD;
		return $xml;
	}
}