<?php

/**
* Manage plugin système trhought php hooks
* @author valentin carruesco
* @category Core
* @license copyright
*/

class Plugin{
	public $id,$name,$author,$link,$licence,$folder,$description,$version,$state,$type,$require,$firms;

	
	function __construct(){
		$this->state = false;
	}

	public static function exist($id){
		foreach(self::getAll() as $plugin)
			if($plugin->id==$id) return true;
		return false;
	}

	public static function addHook($hookName, $functionName){
		$GLOBALS['hooks'][$hookName][] = $functionName;  
	}

	public static function callHook($hookName, $hookArguments = array()) {
		if(!isset($GLOBALS['hooks'][$hookName])) return;
		foreach($GLOBALS['hooks'][$hookName] as $functionName)
			call_user_func_array($functionName, $hookArguments);  
	}
	
	public static function includeAll(){
		global $myFirm;
		
		foreach(self::getAll() as $plugin):
			if(!$plugin->state) continue;
			if(is_numeric($myFirm->id) && !in_array($myFirm->id, $plugin->firms)) continue;
			$main = $plugin->path().SLASH.$plugin->folder.'.plugin.php';
			if(file_exists($main))
				require_once($main);
		endforeach;
	}
	
	public static function getAll($enableOnly = false){
		
		$plugins = array();
		foreach(glob(__ROOT__.PLUGIN_PATH.'*'.SLASH.'app.json') as $file){
			$plugin = self::parseManifest($file);
			if($enableOnly && !$plugin->state) continue;
			$plugins[] = $plugin;
		}

		usort($plugins, function($a, $b){
			if ($a->name == $b->name) 
				$result = 0;

			if($a->name < $b->name){
				$result = -1;
			} else{
				$result = 1;
			}
			return  $result;
		});
		return $plugins;
	}
	
	public static function getById($id){
		$plugin = false;
		foreach(self::getAll() as $onePlugin)
			if($onePlugin->id==$id) $plugin = $onePlugin;
		return $plugin;
	}
	
	public static function parseManifest($file){
		$enabled = self::states();
		$plugin = new self();
		$manifest = json_decode(file_get_contents($file),true);
		if(!$manifest) return $plugin;
		if(!isset($manifest['id']) || !isset($manifest['name']) ) return;
		$plugin->name = $manifest['name'];
		$plugin->id = $manifest['id'];
		$plugin->folder = basename(dirname($file));
		if(isset($enabled[$plugin->id])){
			$plugin->state = true;
			$plugin->firms = $enabled[$plugin->id];
		}
		if(isset($manifest['author'])) $plugin->author = $manifest['author'];
		if(isset($manifest['url'])) $plugin->url = $manifest['url'];
		if(isset($manifest['licence'])) $plugin->licence = $manifest['licence'];
		if(isset($manifest['description'])) $plugin->description = $manifest['description'];
		if(isset($manifest['version'])) $plugin->version = $manifest['version'];
		if(isset($manifest['core'])) $plugin->core = $manifest['core'];
		if(isset($manifest['require'])) $plugin->require = isset($manifest['require'])? $manifest['require']: array();
		return $plugin;
	}
	
	public static function state($id,$state){
		$enabled = self::states();
		$plugin = self::getById($id);
		
		$main = $plugin->path().SLASH.$plugin->folder.'.plugin.php';
		if(file_exists($main))
			require_once($main);
		
		if($state==0){
			unset($enabled[$plugin->id]);
			Plugin::callHook('uninstall',array($plugin->id));
		} else {
			if(!isset($enabled[$plugin->id]))
				$enabled[$plugin->id] = array();
			Plugin::callHook('install',array($plugin->id));
		}
		
		self::states($enabled);
	}
	
	public static  function states($states = false){
		$enabledFile = __ROOT__.PLUGIN_PATH.'enabled.json';
		if(!file_exists($enabledFile)) touch($enabledFile);
		if(!is_array($states)){
			$enabled = json_decode(file_get_contents($enabledFile),true);
			return !is_array($enabled)?array():$enabled;
		}
		file_put_contents($enabledFile,json_encode($states));
	}

	public static function is_active($id){
		$enabled = self::states();
		return isset($enabled[$id]);
	}

	
	public function path(){
		return __ROOT__.PLUGIN_PATH.$this->folder;
	}

	public static function folder($path){
		return str_replace(__ROOT__,'',$path).SLASH;
	}

	public static function url(){
		$bt = debug_backtrace();
		return ROOT_URL.'/'.str_replace(SLASH, '/', PLUGIN_PATH).basename(dirname($bt[0]['file']));
	}


	public static function addCss($css) { 
		$bt =  debug_backtrace();
		if(substr($css, 0,4) != 'http') $css = str_replace(array(__ROOT__,'\\'),array('','/'),dirname($bt[0]['file'])).$css;
		$GLOBALS['hooks']['css_files'][] = $css;  
	}

	public static function callCss($root = null,$cacheVersion = ''){
		if(!isset($GLOBALS['hooks']['css_files'])) return '';
		$stream = '';
		foreach($GLOBALS['hooks']['css_files'] as $css_file){
			$url = $css_file;
			if(isset($root) && substr($css_file,0, 4) != 'http') $url = $root.'/'.$url;
			$stream .='<link rel="stylesheet" href="'.$url.'?v='.$cacheVersion.'">'."\n";
		}
		return $stream;
	}
	
	public static function addJs($js){  
		global $_;
		$bt =  debug_backtrace();
		if(substr($js, 0,4) != 'http') $js = str_replace(array(__ROOT__,'\\'),array('','/'),dirname($bt[0]['file'])).$js;
		$GLOBALS['hooks']['js_files'][] = $js;  
	}

	public static function callJs($root = null,$cacheVersion = ''){
		if(!isset($GLOBALS['hooks']['js_files'])) return '';
		$stream = '';
		foreach($GLOBALS['hooks']['js_files'] as $js_file){
			$url = $js_file;
			if(isset($root) && substr($js_file,0, 4) != 'http') $url = $root.'/'.$url;
			$stream .='<script type="text/javascript" src="'.$url.'?v='.$cacheVersion.'"></script>'."\n";
		}
		return $stream;
	}

	/*
	 Aide à l'inclusion de classes de plugin, ex:
	 require_once('..'.SLASH.'plugin'.SLASH.'issue'.SLASH.'Event.class.php');
	 	devient : 
	 Plugin::need('issue/Event');
	 Il est possible de faires des inclusions mulitples, ex :
	 Plugin::need('issue/Event,client/Client,client/ClientContact');
	*/
	public static function need($selectors){
		foreach(explode(',',$selectors) as $selector){
			list($plugin,$class) = explode('/',$selector);
			require_once(__ROOT__.PLUGIN_PATH.$plugin.SLASH.$class.'.class.php');
		}
	}
	
}

?>