<?php

/**
 * Helper -> Validator
 * Helps validating stuff
 */
 
 class Validator {
 
 	/**
 	 * Checks if string is empty
 	 * @param string
 	 * @return boolean
 	 */
  
	public function isEmpty($uri)
	{
		if($uri == ""){
			return true;
		} else {
			return false;
		}
	}
	
	/**
	* Checks if param is numeric
	*/
	
	public function isNumeric($var)
	{
		if(is_numeric($var)) return TRUE;
		
		return FALSE;
	}
	
	/**
 	 * Checks if string is not empty
 	 * @param string
 	 * @return boolean
 	 */
  
	public function notEmpty($uri)
	{
		if($uri != ""){
			return true;
		} else {
			return false;
		}
	}
	
	/**
	* Checks if a date is valid
	* @param date
	* @return bool
	*/
	
	public function validDate($date)
	{
		$dateA = explode("-", $date);
		
		if(checkdate($dateA[1], $dateA[2], $dateA[0]))
		{
			return true;
		} 
		
		return false;
		
	}
	
	/**
	* Checks if a string is alphanumeric 
	* @param array extra allowed chars
	* @param string
	* @return bool
	*/
	
	public function alphaNumeric($string, $allowed = array())
	{
		if(self::isEmpty($string)) return false;
		
		// Capital
		$minus = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
		
		// Mayus
		foreach($minus as $letter)
			$mayus[] = strtoupper($letter);
		
		// Mix them
		$accepted = array_keys(array_flip(array_merge($minus, $mayus, $allowed)));
		
		/*
		* Work
		* We will iterate each character looking if it is accepted
		* A string is an array itself =)
		*/
		
		for($it = 0; $it < strlen($string); $it++)
		{
			if(!in_array($string[$it], $accepted, true))
			{
				if(!is_numeric($string[$it]))
					return false;
			}
		}
		
		return true;
		
	}
	
	/**
	* Checks lenght of a string between a range given
	* @param string
	* @param int min
	* @param int max
	*/
	
	public function validLenght($string, $min, $max)
	{
		if(strlen($string) < $min || strlen($string) > $max)
		{
			return false;
		} else {
			return true;
		} 
	}
	
	/**
	* Checks wether an email is valid or not
	* At leas __ @  _ . _ _ _
	* Complex extensions supported (ej: .co.uk);
	*
	* @param string mail
	* @return bool
	*/
	
	public function validMail($mail)
	{
		if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $mail))
		{
			return false;
		} else {
			return true;
		}
	}
	
	/**
	* Checks that given field is unique in his table (ex: a nickname)
	*
	* @param string field name
	* @param string value for field
	* @param Model Name
	*/
	
	public function validUniqueField($fieldName, $value, $modelName)
	{
		$results = Query::searchBy($fieldName, $value, $modelName);
		
		// If results are not NULL, that field value is already taken
		if($results != NULL)
		{
			return false;
		}
		
		return true;
	}
	
	
	
	
		
}


?>