<?php
/**
 * Copyright 2010 Aart-Jan Boor <aart-jan@wemag.nl>
 * Author: Aart-Jan Boor
 * Wemag Advisering <http://www.wemag.nl>
 * Website: http://www.ktplugins.com
 *
 * KTPUtil contains all kinds of functionality to make developing
 * plugins easier.
 * 
 */


class KTPUtil{
	
	/**
	 * Checks if one or more database tables are present and shows an informative error page if a table is missing. Can be used to check
	 * if a user has executed a SQL install script already.
	 * @param array $tables array with database tables to check
	 * @return 
	 */
	public static function doDbTableCheck($tables){
		foreach($tables as $table){
			if(!KTPUtil::checkIfDatabaseTableExists($table)){
				KTPUtil::displayError("The database table <i>\"".$table."\"</i>, which is required to install this plugin, is not present in your DMS database. 
				Please consult the plugin installation instructions on how to install this database table.");
			}
		}
	}
	
	/**
	 * Check if a database table exists. 
	 * @param string $table
	 * @return true if exists, false otherwise.
	 */
    public static function checkIfDatabaseTableExists($table) {
        $res = DBUtil::runQuery("SELECT * FROM $table");
        if (PEAR::isError($res)) {
            return false;
        }
        return true;
    }
    
	/**
	 * Show an error on a nicely formatted error page with a (partial) stack trace as optional debugging information. 
	 * @param string $msg Error message
	 * @param boolean $suppressDebug [optional] if set to true no track trace is shown
	 * @return 
	 */
    public static function displayError($msg, $suppressDebug = false) {
        
        $error = $msg .= "<br><br>";
		if($suppressDebug){
	        $trace = debug_backtrace();
			foreach($trace as $t){
				$msg .= $t['file']." - line ".$t['line']."<br>";
			}
			$msg.="<Br><br>";
		}
		$_SESSION['ktp_error_msg'] = $msg;
        header("Location: ".KTUtil::kt_url()."/plugins/KTPFramework/error.php");
        exit;
    }
	
	/**
	 * Registers output trigger, see tutorial on http://www.ktplugins.com for more information.
	 * @param string $plugin_namespace plugin namespace
	 * @param string $class classname
	 * @param string $file filename
	 * @return 
	 */
	public static function registerOutputTrigger($plugin_namespace,$class,$file){
		return self::registerTrigger($plugin_namespace, "output", $class, $file);
	}
	
	/**
	 * Registers admin output trigger, see tutorial on http://www.ktplugins.com for more information.
	 * @param string $plugin_namespace plugin namespace
	 * @param string $class classname
	 * @param string $file filename
	 * @return 
	 */
	public static function registerAdminOutputTrigger($plugin_namespace,$class,$file){
		return self::registerTrigger($plugin_namespace, "admin_output", $class, $file);
	}
	
	/**
	 * Registers render trigger, see tutorial on http://www.ktplugins.com for more information.
	 * @param string $plugin_namespace plugin namespace
	 * @param string $class classname
	 * @param string $file filename
	 * @return 
	 */
	public static function registerRenderTrigger($plugin_namespace,$class,$file){
		return self::registerTrigger($plugin_namespace, "render", $class, $file);
	}
	
	/**
	 * Registers admin render trigger, see tutorial on http://www.ktplugins.com for more information.
	 * @param string $plugin_namespace plugin namespace
	 * @param string $class classname
	 * @param string $file filename
	 * @return 
	 */
	public static function registerAdminRenderTrigger($plugin_namespace,$class,$file){
		return self::registerTrigger($plugin_namespace, "admin_render", $class, $file);
	}
	
	/**
	 * Add a trigger which is launched when a portlet is added to the sidebar. 
	 * @param string $plugin_namespace plugin namespace
	 * @param string $class classname
	 * @param string $file filename
	 * @return 
	 */
	public static function registerAddPortletTrigger($plugin_namespace,$class,$file){
		return self::registerTrigger($plugin_namespace, "add_portlet", $class, $file);
	}
	
	
	/**
	 * Registers a trigger, use dedicated methods for each different type if possible.
	 * @param object $plugin_namespace
	 * @param object $type
	 * @param object $class
	 * @param object $file
	 * @return 
	 */
	public static function registerTrigger($plugin_namespace,$type,$class,$file){
		$res = DBUtil::getResultArray("SELECT * FROM ktp_fw_triggers WHERE plugin = '".mysql_real_escape_string($plugin_namespace)."' AND type = '".
		mysql_real_escape_string($type)."' AND class = '".mysql_real_escape_string($class)."' AND file = '".mysql_real_escape_string($file)."'");
		if(count($res) == 0){
			$res = DBUtil::runQuery("INSERT INTO ktp_fw_triggers (plugin,type,class,file)
			VALUES ('".mysql_real_escape_string($plugin_namespace)."','".mysql_real_escape_string($type)."','".
			mysql_real_escape_string($class)."','".mysql_real_escape_string($file)."')");
			return $res;		
		}
	}
	

}
?>