<?php
/*
 * ImiComponent.php
 * Copyright ALM Software Technologies
 * Created by fm 
 * Date created Jul 19, 2008
 * Description: Base Itshomi component class
 * 
 */
class ImiComponent{
    protected $comps = array(),$layout = 'CONTENT_TEXT',$task='',
	$compPath="",$compName = "", $compEvents = null;
    
    function __construct(){
        $this->navigator = &$GLOBALS['navigator'];
    }
    
	function setLayout($nlayout){
		$this->layout = $nlayout;
	}
	
	function compPath(){
		return $this->compPath;
	}
	
	function setPath($p){
		$this->compPath = $p;
	}
	
	function setTask($tsk){
		$this->task = $tsk;
	}
	
	function setName($cname){
		$this->compName = $cname;
	}
	
	/**
	*  get current task (usually value of user request for current query label. Example: if user 
	*  submitted index.php?option=about and option is the current query label, then getTask would 
	*  return 'about'
	*/
	function getTask(){
		return $this->task;	
	}
	
	/**
	*  adds a child component to the current component
	*/
    function addComponent($cname,&$component){
        $this->comps[$cname]=&$component;
    }
    
	/**
	*  executes any composite or children components of the current component
	*/
    function play(){
        foreach($this->comps as $component){
            $component->play();
        }
    }   
    
    function getComponent($cname){
        if(array_key_exists($cname,$this->comps))
            return $this->comps[$cname]; 
        return null;
    } 
    
	/**
	*  loads content of given file, which must exist within the component's folder
	*/
    function getFile($fname){
        return file_get_contents($this->compPath.$fname);
    }
    
	/**
	*  return specified class of current component. The class must be defined within the component's 
	*  folder in a file with the same name as the class, and extension .php
	*  Throws 'Class not found' exception
	*/
	function &getClass($classname){
		$compClass = &$this->navigator->getClass($this->compPath,$classname);
		if($compClass instanceof ImiComponent)
        	$compClass->setPath($this->compPath);
		return $compClass;
	}
	
	/**
	*  return given Framework's utility class
	*  Throws 'Class not found' exception
	*/
	function &getUtil($classname){
		$compClass = &$this->navigator->getUtil($classname);
		if($compClass instanceof ImiComponent)
        	$compClass->setPath($this->compPath);
		return $compClass;
	}
	
	function &getInstance($cname){
		$inst = &$this->navigator->getInstance($cname);
		return $inst;
	}
	
    function addView($view){
        $this->navigator->addView($view);
    } 
    
    function addViewData($p,$view){
		$this->navigator->addViewData($p,$view);
    }  
	
	/**
	*  add component as listener 
	*  @param $evName event name
	*  @param $listener component name
	*  @param $evType (optional)
	*  @param $viewid (optional)
	*/
	function addListener($evName,$listener,$evType=2,$viewid=0){
		$this->navigator->addListener($evName,$listener,$evType=2,$viewid=0);
	}
	
	/**
	*  component quick installer. Use to install a component
	*  make sure to add the events your component must handle to $this->compEvents.
	*/
	function install(){
		if(!is_array($this->compEvents)){
			$this->addViewData('FEEDBACK','Could not find any event to install. Please add your events to $this->compEvents');
			return;
		}	
		foreach($this->compEvents as $ev){
			$this->addListener($ev,$this->compName);
		}	
	}
	
    /**
     * 
     * @param $url
     * @param $title
     * @param $label
     * @param $access (user,admin)
     * @param $position (top,left,right)
     * @return unknown_type
     */
    function addMenuItem($url,$title,$label,$access='user',$position='top'){
    	$atag = 'ADM_';
    	if($access=='user')
    		$atag = '';
    	$p = '_TOP';
    	if($position=='left')
    		$p = '_LEFT';
    	else		
    	if($position=='right')
    		$p = '_RIGHT';
    	$html = '<a href="'.$url.'" title="'.$title.'">'.$label.'</a>';
    	$this->addViewData($atag.'XTRA_MNU'.$p,$html);
    }
    
	/**
	*  return current query label (example: the word between ? and = here: ?option= or ?event=)
	*/
    function webev(){
    	return $this->navigator->getCfg('def_webev_label');
    }
    
	/**
	*  return a given configuration entry
	*/
	function getCfg($key){
		return $this->navigator->getCfg($key);
	}
	
	function checkClearance($ctype,$value){ 
		switch($ctype){
			case 'role':
				if(!$_SESSION['LoggedIn'])
					return false;
				return ($_SESSION['roleid']==$value);	
			break;
		}
	}
	
	/**
	*  throws exception if caller is not admin. Use in your components for access control
	*/
	function adminOnly(){
		global $config;
		if(!$this->checkClearance('role',$config['admrole'])){
			throw new Exception('Access denied');
        }
	}	
	
	/** redirect to specified internal url */
	function redirect($url)
	{
	
		if (!headers_sent())
		{
		  header("Location: http://" . $_SERVER['HTTP_HOST']
				  . "/".dirname($_SERVER['PHP_SELF'])
				  . "/".$url);
		}else
			addlog("Redirect for ".$url." failed. Headers sent already");
	}
    
    /** redirect to specified external url */
    function redirectOut($url)
    {
    
        if (!headers_sent())
        {
          header("Location: " . $url);
        }else
            addlog("Redirect for ".$url." failed. Headers sent already");
    }

	function onComponentAction($compName,$actionName){
		
	}
	
	function onEvent($ev){
	
	}
	
	/**
	* error login with different categories of errors
	*/
	function addlog($msg,$type='sys',$level='error',$prefix=""){
		$date = date("Y-m-d");
		if(strlen($prefix)>0)
			$prefix.='_';
		switch($type){
			case 'sys':
				$fname = 'logs/sys_'.$prefix.$level.'_'.$date;
			break;
			case 'support':
				$fname = 'logs/sup_'.$prefix.$level.'_'.$date;
			break;
			case 'user':
				$fname = 'logs/use_'.$prefix.$level.'_'.$date;
			break;
		}
		error_log("[".date("D Y/m/d H:i:s")."][".$level."]: ".$msg."\r\n",3,$fname);
	}
} 
?>