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<?php
/*---------------------------------------------------------------------------
		File name ............ common/includes/url-rewriting.inc.php
		Author ............... Antoine Lemoine
		Creation date ........ 22.03.2010
		Modification date .... 29.06.2010
---------------------------------------------------------------------------*/

class UrlRewritingRule {
	var $from;
	var $to;
	var $childs;

	function UrlRewritingRule($from, $to, $childs=null) {
		$this->from = $from;
		$this->to = $to;
		$this->childs = $childs;
	}
}

class UrlRewriting {
	var $lang;
	var $translations_table;
	var $reverse_translations_table;
	var $redirect_table;
	var $url_rewriting_source;
	var $current_url_params;

	function UrlRewriting() {
		global $global;
		$this->url_rewriting_source = isset($_GET['url-rewriting-source']) ? $_GET['url-rewriting-source'] : null;
		$this->current_url_params = array();
		
		$this->translations_table = array();
		$this->reverse_translations_table = array();
		$this->redirect_table = array();
	}
	
	function redirect($url, $redirect_type=null) {
		global $global;
		switch ($redirect_type) {
			case 301 : header("Status: 301 Moved Permanently", false, 301); break;
			default: break;
		}
		header("Location: ".(substr($url,0,7)=='http://' ? '' : $global->config['document_base_href']).$url);
		exit;
	}

	function checkLanguage() {
		global $global;
		
		if (!isset($global->lang) || !in_array($global->lang,$global->config['languages']['availables'])) {
			$global->lang = $global->config['languages']['default'];
			$global->page = 'erreur-404';
		}
	}

	function _setParameters($parameters) {
		global $global;
		
		$pairs = explode('&',$parameters);
		$n = count($pairs);
		for ($i=0; $i<$n; $i++) {
			$p = explode('=',$pairs[$i]);
			switch ($p[0]) {
				case 'page' :
					$global->page = $p[1];
					break;
				case 'lang' :
					$global->lang = $p[1];
					break;
				default :
					$_GET[$p[0]] = $p[1];
			}
			$this->current_url_params[$p[0]] = $p[1];
		}
	}

	function getCurrentUrlParams() {
		$output = array();
		foreach ($this->current_url_params as $key => $value) {
			$output[] = $key.'='.$value;
		}
		return implode('&',$output);
	}

	function parseCurrentUrl() {
		global $global;

		if (isset($_GET['minified'])) return;
		if (!isset($global->config['url_rewriting'])) return;

		$global->page = isset($_GET['page']) ? $_GET['page'] : 'erreur-404';
		$global->lang = isset($_GET['lang']) ? $_GET['lang'] : null;
		if ((!isset($this->url_rewriting_source) || $this->url_rewriting_source=='') && isset($_GET['page'])) {
			$this->current_url_params = $_GET;
		}
		else if (isset($this->url_rewriting_source)) {
			$this->current_url_params = array();
			if (isset($this->redirect_table['*'.$this->url_rewriting_source])) {
				$this->redirect($this->url($this->redirect_table['*'.$this->url_rewriting_source]),301);
			}
			$url_elements = explode('/',$this->url_rewriting_source);
			do {
				$part = implode('/',$url_elements);
				if (isset($this->reverse_translations_table[$part])) {
					foreach ($this->reverse_translations_table[$part] as $parameters) {
						$this->_setParameters($parameters);
					}
					return;
				}
				array_pop($url_elements);
			} while (count($url_elements)>0);
		}
	}

	function addRedirectRule($from, $to) {
		$this->redirect_table['*'.$from] = $to;
	}

	function addRewriteRules() {
		$rules = func_get_args();
		foreach ($rules as $rule) {
			$this->addRewriteRule($rule,false);
		}
		$this->parseCurrentUrl();
	}

	function addRewriteRule($rule, $parse_current_url=true) {
		$from_keys = array();
		$to_keys = array();
		$this->_addRewriteRule($rule,$from_keys,$to_keys);
		if ($parse_current_url) $this->parseCurrentUrl();
	}

	function _addRewriteRule($rule, $from_keys, $to_keys) {
		$from_keys[] = $rule->from;
		$to_keys[] = substr($rule->to,-1,1)=='/' ? substr($rule->to,0,-1) : $rule->to;
		$from_key = implode('&',$from_keys);
		$to_key = implode('/',$to_keys);
		if (!isset($this->translations_table[$from_key])) {
			$this->translations_table[$from_key] = $to_key;
			$this->reverse_translations_table[$to_key] = $from_keys;
		}
		if (isset($rule->childs) && is_array($rule->childs)) {
			foreach ($rule->childs as $child_rule) {
				$this->_addRewriteRule($child_rule,$from_keys,$to_keys);
			}
		}
	}

	function _clean($argument) {
		return str_replace('&amp;','&',$argument);
	}

	function url() {
		global $global;
		$args = func_get_args();
		if (count($args)==1 && is_array($args[0])) $args = $args[0];

		if ($global->config['languages']['enabled'] && substr($args[0],0,5)!='lang=') {
			$args[0] = 'lang='.$global->lang.'&'.$args[0];
		}		

		$anchor = null;
		foreach ($args as $index => $arg) {
			$args[$index] = $this->_clean($arg);
			if ($arg{0}=='#') {
				$anchor = substr($arg,1,strlen($arg));
				unset($args[$index]);
			}
		}

		$arg1 = array_shift($args);
		$parameters = implode('&',$args);
		if ($global->config['url_rewriting']) {
			$page_name = null;
			if (isset($this->translations_table[$arg1])) {
				$page_name = $this->translations_table[$arg1];
			} else {
				$parameters = $arg1.($parameters!='' ? '&'.$parameters : '');
			}
			return (isset($page_name) ? $page_name : '').($parameters!='' ? '?'.$parameters : '').(isset($anchor) ? '#'.$anchor : '');
		} else {
			$parameters = $arg1.($parameters!='' ? '&'.$parameters : '');
			return '.'.'?'.$parameters.(isset($anchor) ? '#'.$anchor : '');
		}
	}

	function encoded_url() {
		$args = func_get_args();
		if (count($args)==1 && is_array($args[0])) $args = $args[0];
		
		return str_replace('&','&amp;',$this->url($args));
	}
}

?>