<?php
/* ***************************************************************************
 * Copyright (C) 2001      Eric Seigne         <erics@rycks.com>
 * Copyright (C) 2004-2009 Destailleur Laurent <eldy@users.sourceforge.net>
 *
 * 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
 * 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.
 * ************************************************************************* */

/**
 *   	\file       htdocs/translate.class.php
 *		\brief      File for Tanslate class
 *		\author	    Eric Seigne
 *		\author	    Laurent Destailleur
 *		\version    $Id$
 */


/**
 *      \class      Translate
 *		\brief      Class to manage translations
 */
class Translate {

	var $dir;						// Directories that contains /langs subdirectory

	var $defaultlang;				// Langue courante en vigueur de l'utilisateur

	var $tab_loaded=array();		// Tableau pour signaler les fichiers deja charges
	var $tab_translate=array();		// Tableau des traductions

	var $cache_labels=array();		// Cache for labels

	var $charset_inputfile=array();	// To store charset encoding used for language
	var $charset_output='UTF-8';	// Codage used by "trans" method outputs


	/**
	 *  \brief      Constructeur de la classe
	 *  \param      dir             Force directory that contains /langs subdirectory
	 *  \param      conf			Objet qui contient la config Dolibarr
	 */
	function Translate($dir = "",$conf)
	{
		// If charset output is forced
		if (! empty($conf->file->character_set_client))
		{
			$this->charset_output=$conf->file->character_set_client;
		}
		if ($dir) $this->dir=array($dir);
		else $this->dir=$conf->file->dol_document_root;
	}


	/**
	 *	\brief		Return string translated for a key
	 *				Translation array must have been loaded before.
	 *	\param		key			Key to translate
	 *	\return		string		Translated string
	 */
	function getTransFromTab($key)
	{
		if (! empty($this->tab_translate[$key]))
		{
			return $this->tab_translate[$key];
		}
		else
		{
			return '';
		}
	}

	/**
	 *	\brief		Positionne la chaine traduite pour une cle donnee.
	 *	\param		key			Key to translate
	 *	\return		string		Translated string
	 */
	function setTransFromTab($key,$value)
	{
		$this->tab_translate[$key]=$value;
	}


	/**
	 *  \brief      Set accessor for this->defaultlang
	 *  \param      srclang     	Language to use
	 */
	function setDefaultLang($srclang='fr_FR')
	{
		//dol_syslog("Translate::setDefaultLang ".$this->defaultlang,LOG_DEBUG);

		$this->origlang=$srclang;

		if (empty($srclang) || $srclang == 'auto')
		{
			$langpref=$_SERVER['HTTP_ACCEPT_LANGUAGE'];
			$langpref=eregi_replace(";[^,]*","",$langpref);
			$langpref=eregi_replace("-","_",$langpref);

			$langlist=split("[;,]",$langpref);

			$langpart=split("_",$langlist[0]);
			//print "Short before _ : ".$langpart[0].'/ Short after _ : '.$langpart[1];

			if (isset($langpart[1])) {
				$srclang=strtolower($langpart[0])."_".strtoupper($langpart[1]);
				// Array to convert long lang code into other long code.
				$longforlong=array('no_nb'=>'nb_NO');
				if (isset($longforlong[strtolower($srclang)])) $srclang=$longforlong[strtolower($srclang)];
			}
			else {
				// Array to convert short lang code into long code.
				$longforshort=array('ca'=>'ca_ES', 'nb'=>'nb_NO', 'no'=>'nb_NO');
				if (isset($longforshort[strtolower($langpart[0])])) $srclang=$longforshort[strtolower($langpart[0])];
				else $srclang=strtolower($langpart[0])."_".strtoupper($langpart[0]);
			}
		}

		$this->defaultlang=$srclang;
	}


	/**
	 *  \brief      Return active language code for current user
	 * 	\remarks	Accessor for this->defaultlang
	 *  \return     string      Language code used (en_US, en_AU, fr_FR, ...)
	 */
	function getDefaultLang()
	{
		return $this->defaultlang;
	}


	/**
	 *	Deprecated function. Do nothing.
	 *	@deprecated		Kept for backward compatibility with third party modules.
	 */
	function setPhpLang()
	{
		return;
	}


	/**
	 *  \brief      Load in a memory array, translation key-value for a particular file.
	 *              If data for file already loaded, do nothing.
	 * 				All data in translation array are stored in UTF-8 format.
	 *  \param      domain      File name to load (.lang file). Use @ before value if domain is in a module directory.
	 *  \param      alt         Use alternate file even if file in target language is found
	 *	\return		int			<0 if KO, >0 if OK
	 *	\remarks	tab_loaded is completed with $domain key.
	 *				Value for key is: 1:Loaded from disk, 2:Not found, 3:Loaded from cache
	 */
	function Load($domain,$alt=0)
	{
		global $conf;
		//dol_syslog("Translate::Load domain=".$domain." alt=".$alt);

		// Check parameters
		if (empty($domain))
		{
			dol_print_error('',"Translate::Load ErrorWrongParameters");
			exit;
		}

		// Check cache
		if (! empty($this->tab_loaded[$domain])) { return; }    // Le fichier de ce domaine est deja charge

		foreach($this->dir as $searchdir)
		{
			$newalt=$alt;

			// If $domain is @xxx instead of xxx then we look for module lang file htdocs/xxx/langs/code_CODE/xxx.lang
			// instead of global lang file htdocs/langs/code_CODE/xxx.lang
			if (eregi('@',$domain))	// It's a language file of a module, we look in dir of this module.
			{
				$domain=eregi_replace('@','',$domain);
				$searchdir=$searchdir ."/".$domain."/langs";
			}
			else $searchdir=$searchdir."/langs";

			// Directory of translation files
			$scandir = $searchdir."/".$this->defaultlang;
			$file_lang =  $scandir . "/".$domain.".lang";
			$filelangexists=is_file($file_lang);
			//print 'Load default_lang='.$this->defaultlang.' alt='.$alt.' newalt='.$newalt.' '.$file_lang."-".$filelangexists.'<br>';

			// Check in "always available" alternate file if not found or if asked
			if ($newalt || ! $filelangexists)
			{
				// Dir of always available alternate file (en_US or fr_FR)
				if ($this->defaultlang == "en_US") $scandiralt = $searchdir."/fr_FR";
				elseif (eregi('^fr',$this->defaultlang) && $this->defaultlang != 'fr_FR') $scandiralt = $searchdir."/fr_FR";
				elseif (eregi('^en',$this->defaultlang) && $this->defaultlang != 'en_US') $scandiralt = $searchdir."/en_US";
				elseif (eregi('^es',$this->defaultlang) && $this->defaultlang != 'es_ES') $scandiralt = $searchdir."/es_ES";
				else $scandiralt = $searchdir."/en_US";

				$file_lang = $scandiralt . "/".$domain.".lang";
				$filelangexists=is_file($file_lang);
				$newalt=1;
			}
			//print 'Load alt='.$alt.' newalt='.$newalt.' '.$file_lang."-".$filelangexists.'<br>';

			if ($filelangexists)
			{
				// Enable cache of lang file in session (faster but need more memory)
				// Speed gain: 40ms - Memory overusage: 200ko (Size of session cache file)
				$enablelangcacheinsession=false;

				if ($enablelangcacheinsession && isset($_SESSION['lang_'.$domain]))
				{
					foreach($_SESSION['lang_'.$domain] as $key => $value)
					{
						$this->tab_translate[$key]=$value;
						$this->tab_loaded[$domain]=3;           // Marque ce fichier comme charge depuis cache session
					}
				}
				else
				{
					if ($fp = @fopen($file_lang,"rt"))
					{
						if ($enablelangcacheinsession) $tabtranslatedomain=array();	// To save lang in session
						$finded = 0;
						while (($ligne = fgets($fp,4096)) && ($finded == 0))
						{
							if ($ligne[0] != "\n" && $ligne[0] != " " && $ligne[0] != "#")
							{
								$tab=split('=',$ligne,2);
								$key=trim($tab[0]);
								//print "Domain=$domain, found a string for $tab[0] with value $tab[1]<br>";
								if (empty($this->tab_translate[$key]) && isset($tab[1]))
								{
									$value=trim(ereg_replace('\\\n',"\n",$tab[1]));

									if (eregi('^CHARSET$',$key))
									{
										// On est tombe sur une balise qui declare le format du fichier lu
										$this->charset_inputfile[$domain]=strtoupper($value);
										//print 'File '.$file_lang.' is declared to have format '.$this->charset_inputfile[$domain].'<br>';
									}
									else
									{
										// On stocke toujours dans le tableau Tab en UTF-8
										//if (empty($this->charset_inputfile[$domain]) || $this->charset_inputfile[$domain] == 'UTF-8')      $value=utf8_decode($value);
										if (empty($this->charset_inputfile[$domain]) || $this->charset_inputfile[$domain] == 'ISO-8859-1') $value=utf8_encode($value);

										// We do not load Separator values for alternate files
										if (! $newalt || (! eregi('^Separator',$key)))
										{
											//print 'XX'.$key;
											$this->tab_translate[$key]=$value;
										}
										if ($enablelangcacheinsession) $tabtranslatedomain[$key]=$value;	// To save lang in session
									}
								}
							}
						}
						fclose($fp);

						// Pour les langues aux fichiers parfois incomplets, on charge la langue alternative
						if (! $newalt && $this->defaultlang != "fr_FR" && $this->defaultlang != "en_US")
						{
							// This function MUST NOY contains call to syslog
							//dol_syslog("Translate::Load loading alternate translation file (to complete ".$this->defaultlang."/".$domain.".lang file)", LOG_DEBUG);
							$this->load($domain,1);
						}

						$this->tab_loaded[$domain]=1;           // Marque ce fichier comme charge

						// To save lang in session
						if ($enablelangcacheinsession && sizeof($tabtranslatedomain)) $_SESSION['lang_'.$domain]=$tabtranslatedomain;

						break;		// Break loop on each root dir
					}
				}
			}
		}

		// Format for date
		if ($domain == 'main')
		{
			$conf->format_date_short=empty($this->tab_translate['FormatDateShort'])?"%d/%m/%Y":$this->tab_translate['FormatDateShort'];					# Format of day with PHP/C tags (strftime functions)
			$conf->format_date_short_java=empty($this->tab_translate['FormatDateShortJava'])?"dd/MM/yyyy":$this->tab_translate['FormatDateShortJava'];	# Format of day with Java tags
			$conf->format_hour_short=empty($this->tab_translate['FormatHourShort'])?"%H:%M":$this->tab_translate['FormatHourShort'];
			$conf->format_date_text_short=empty($this->tab_translate['FormatDateTextShort'])?"%d %b %Y":$this->tab_translate['FormatDateTextShort'];
			$conf->format_date_text=empty($this->tab_translate['FormatDateText'])?"%d %B %Y":$this->tab_translate['FormatDateText'];
			$conf->format_date_hour_short=empty($this->tab_translate['FormatDateHourShort'])?"%d/%m/%Y %H:%M":$this->tab_translate['FormatDateHourShort'];
			$conf->format_date_hour_text_short=empty($this->tab_translate['FormatDateHourTextShort'])?"%d %b %Y %H:%M":$this->tab_translate['FormatDateHourTextShort'];
			$conf->format_date_hour_text=empty($this->tab_translate['FormatDateHourText'])?"%d %B %Y %H:%M":$this->tab_translate['FormatDateHourText'];
			//print $domain." => ".$this->defaultlang." ".$conf->format_date_hour_short." ".$this->tab_translate['FormatDateHourShort'];
		}

		if (empty($this->tab_loaded[$domain])) $this->tab_loaded[$domain]=2;           // Marque ce fichier comme non trouve

		return 1;
	}


	/**
	 *  \brief      Mark domain as not loaded to be able to load it again.
	 *  \param      domain      File name to load (.lang file). Use @ before value if domain is in a module directory.
	 */
	function UnLoad($domain)
	{
		dol_syslog("Translate::UnLoad domain=".$domain." marked as not loaded", LOG_DEBUG);
		$this->tab_loaded[$domain]=0;
	}

	/**
	 *	\brief      Retourne la liste des domaines charg�es en memoire
	 *  \return     array       Tableau des domaines charg�es
	 */
	function list_domainloaded()
	{
		$ret='';
		foreach($this->tab_loaded as $key=>$val)
		{
			if ($ret) $ret.=',';
			$ret.=$key.'='.$val;
		}
		return $ret;
	}


	/**
	 *  \brief      Retourne la version traduite du texte passe en parametre en la codant en HTML
	 *              Si il n'y a pas de correspondance pour ce texte, on cherche dans fichier alternatif
	 *              et si toujours pas trouve, il est retourne tel quel
	 *              Les parametres de cette methode peuvent contenir de balises HTML.
	 *  \param      key         cle de chaine a traduire
	 *  \param      param1      chaine de param1
	 *  \param      param2      chaine de param2
	 *  \param      param3      chaine de param3
	 *  \param      param4      chaine de param4
	 *	\param		maxsize		taille max
	 *  \return     string      Chaine traduite et code en HTML
	 */
	function trans($key, $param1='', $param2='', $param3='', $param4='', $maxsize=0)
	{
		if ($this->getTransFromTab($key))	// Translation is available
		{
			$str=eregi_replace('\\\"','"',$this->tab_translate[$key]);	// To solve some translation keys containing key=abc\"def\"ghi instead of abc"def"ghi
			$str=sprintf($str,$param1,$param2,$param3,$param4);
			if ($maxsize) $str=dol_trunc($str,$maxsize);
			// On remplace les tags HTML par __xx__ pour eviter traduction par htmlentities
			$newstr=ereg_replace('<','__lt__',$str);
			$newstr=ereg_replace('>','__gt__',$newstr);
			$newstr=ereg_replace('"','__quot__',$newstr);

			$newstr=$this->convToOutputCharset($newstr);	// Convert string to $this->charset_output

			// Cryptage en html de la chaine
			// $newstr est une chaine stockee en memoire au format $this->charset_output
			$newstr=htmlentities($newstr,ENT_QUOTES,$this->charset_output);

			// On restaure les tags HTML
			$newstr=ereg_replace('__lt__','<',$newstr);
			$newstr=ereg_replace('__gt__','>',$newstr);
			$newstr=ereg_replace('__quot__','"',$newstr);
			return $newstr;
		}
		else								// Translation is not available
		{
			$newstr=$key;
			if (eregi('CurrencyShort([A-Z]+)$',$key,$reg))
			{
				global $db;
				//$newstr=$this->getLabelFromKey($db,$reg[1],'c_currencies','code_iso','labelshort');
				$newstr=$this->getLabelFromKey($db,$reg[1],'c_currencies','code_iso','code');
			}
			else if (eregi('Currency([A-Z]+)$',$key,$reg))
			{
				global $db;
				$newstr=$this->getLabelFromKey($db,$reg[1],'c_currencies','code_iso','label');
			}
			else if (eregi('SendingMethod([0-9A-Z]+)$',$key,$reg))
			{
				global $db;
				$newstr=$this->getLabelFromKey($db,$reg[1],'expedition_methode','code','libelle');
			}
			return $this->convToOutputCharset($newstr);
		}
	}


	/**
	 *  \brief       Return translated value of a text string
	 *               Si il n'y a pas de correspondance pour ce texte, on cherche dans fichier alternatif
	 *               et si toujours pas trouve, il est retourne tel quel.
	 *               Parameters of this method must not contains any HTML tags.
	 *  \param       key         key of string to translate
	 *  \param       param1      chaine de param1
	 *  \param       param2      chaine de param1
	 *  \param       param3      chaine de param1
	 *  \param       param4      chaine de param1
	 *  \return      string      chaine traduite
	 */
	function transnoentities($key, $param1='', $param2='', $param3='', $param4='')
	{
		$newstr=$key;
		if ($this->getTransFromTab($newstr))
		{
			// Si la traduction est disponible
			$newstr=sprintf($this->tab_translate[$newstr],$param1,$param2,$param3,$param4);
		}
		return $this->convToOutputCharset($newstr);
	}


	/**
	 *  \brief       Return translated value of a text string
	 *               Si il n'y a pas de correspondance pour ce texte, on cherche dans fichier alternatif
	 *               et si toujours pas trouve, il est retourne tel quel.
	 *               No convert to encoding charset of lang object is done.
	 *               Parameters of this method must not contains any HTML tags.
	 *  \param       key         key of string to translate
	 *  \param       param1      chaine de param1
	 *  \param       param2      chaine de param1
	 *  \param       param3      chaine de param1
	 *  \param       param4      chaine de param1
	 *  \return      string      chaine traduite
	 */
	function transnoentitiesnoconv($key, $param1='', $param2='', $param3='', $param4='')
	{
		$newstr=$key;
		if ($this->getTransFromTab($newstr))
		{
			// Si la traduction est disponible
			$newstr=sprintf($this->tab_translate[$newstr],$param1,$param2,$param3,$param4);
		}
		return $newstr;
	}


	/**
	 *  \brief       Retourne la version traduite du texte passe en parametre complete du code pays
	 *  \param       str            chaine a traduire
	 *  \param       countrycode    code pays (FR, ...)
	 *  \return      string         chaine traduite
	 */
	function transcountry($str, $countrycode)
	{
		if ($this->tab_translate["$str$countrycode"]) return $this->trans("$str$countrycode");
		else return $this->trans($str);
	}


	/**
	 *  \brief       Retourne la version traduite du texte passe en parametre complete du code pays
	 *  \param       str            chaine a traduire
	 *  \param       countrycode    code pays (FR, ...)
	 *  \return      string         chaine traduite
	 */
	function transcountrynoentities($str, $countrycode)
	{
		if ($this->tab_translate["$str$countrycode"]) return $this->transnoentities("$str$countrycode");
		else return $this->transnoentities($str);
	}


	/**
	 *  \brief      Convert a string into output charset (this->charset_output that should be defined to conf->file->character_set_client)
	 *  \param      str            	String to convert
	 *  \param		pagecodefrom	Page code of src string
	 *  \return     string         	Converted string
	 */
	function convToOutputCharset($str,$pagecodefrom='UTF-8')
	{
		if ($pagecodefrom == 'ISO-8859-1' && $this->charset_output == 'UTF-8')  $str=utf8_encode($str);
		if ($pagecodefrom == 'UTF-8' && $this->charset_output == 'ISO-8859-1')	$str=utf8_decode($str);
		return $str;
	}


	/**
	 *  \brief       Retourne la liste des langues disponibles
	 *  \return      array     list of languages
	 */
	function get_available_languages($langdir=DOL_DOCUMENT_ROOT)
	{
		// We scan directory langs to detect available languages
		$handle=opendir($langdir ."/langs");
		$langs_available=array();
		while ($file = trim(readdir($handle)))
		{
			if (eregi('^[a-z]+_[A-Z]+',$file))
			{
				array_push($langs_available,$file);
			}
		}
		return $langs_available;
	}


	/**
	 *  \brief      Renvoi si le fichier $filename existe dans la version de la langue courante ou alternative
	 *  \param      filename        nom du fichier a rechercher
	 *  \param      searchalt       cherche aussi dans langue alternative
	 *  \return     boolean         true si existe, false sinon
	 */
	function file_exists($filename,$searchalt=0)
	{
		// Test si fichier dans repertoire de la langue
		foreach($this->dir as $searchdir)
		{
			$htmlfile=$searchdir."/langs/".$this->defaultlang."/".$filename;
			if (is_readable($htmlfile)) return true;

			if ($searchalt) {
				// Test si fichier dans repertoire de la langue alternative
				if ($this->defaultlang != "en_US") $htmlfilealt = $searchdir."/langs/en_US/".$filename;
				else $htmlfilealt = $searchdir."/langs/fr_FR/".$filename;
				if (is_readable($htmlfilealt)) return true;
			}
		}

		return false;
	}


	/**
	 *      \brief      Return a label for a key. Store key-label in a cache.
	 * 		\param		db			Database handler
	 * 		\param		key			Key to get label (key in language file)
	 * 		\param		tablename	Table name without prefix
	 * 		\param		fieldkey	Field for key
	 * 		\param		fieldlabel	Field for label
	 * 		\param		fieldval	Value to find record
	 *      \return     string		Label
	 *		\remarks	This function can be used to get label in database but more often to get code from key id.
	 */
	function getLabelFromKey($db,$key,$tablename,$fieldkey,$fieldlabel)
	{
		// If key empty
		if ($key == '') return '';

		// Check in language array
		if ($this->transnoentities($key) != $key)
		{
			return $this->transnoentities($key);    // Found in language array
		}

		// Check in cache
		if (isset($this->cache_labels[$tablename][$key]))	// Can be defined to 0 or ''
		{
			return $this->cache_labels[$tablename][$key];   // Found in cache
		}

		$sql = "SELECT ".$fieldlabel." as label";
		$sql.= " FROM ".MAIN_DB_PREFIX.$tablename;
		$sql.= " WHERE ".$fieldkey." = '".$key."'";
		dol_syslog('Translate::getLabelFromKey sql='.$sql,LOG_DEBUG);
		$resql = $db->query($sql);
		if ($resql)
		{
			$obj = $db->fetch_object($resql);
			if ($obj) $this->cache_labels[$tablename][$key]=$obj->label;
			else $this->cache_labels[$tablename][$key]='';
			$db->free($resql);
			return $this->cache_labels[$tablename][$key];
		}
		else
		{
			$this->error=$db->lasterror();
			dol_syslog("Translate::getLabelFromKey error=".$this->error,LOG_ERR);
			return -1;
		}
	}

}

?>