<?php

// less errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// make sure there's no unnecessary escaping
set_magic_quotes_runtime(0);

// removes magic quotes if that option is enabled
function undoMagic($data) {
	return get_magic_quotes_gpc() ? stripslashes($data) : $data;
}

class Verify {
	
	function Verify($aSetup)
	{
		$this->aFormVars = array();
		$this->aChecks   = array();
		$this->aIsValid  = array();
		$this->oAction   = new Action();
		$this->strErrorIndication = '';
		
		$this->type = $_REQUEST['verify'];
		$aInfo = $aSetup[$this->type];
		
		if (!$aInfo)
			return;
		
		$this->oAction    =& $aInfo['action'];
		$this->aChecks    = $aInfo['checks'];
		$this->strErrorIndication = $aInfo['errorIndication'];

		// verify all checks, fill vars
		$bAllValid = 1;
		foreach (array_keys($this->aChecks) as $name) 
		{
			$check = &$this->aChecks[$name];		
			$this->aFormVars[$name] = undoMagic($_REQUEST[$name]);
			$this->aIsValid[$name]	= $check->isValid($this, $this->aFormVars[$name]);
			if (!$this->aIsValid[$name])
				$bAllValid = 0;
		}
		
		if ($bAllValid == 1)
		{
			$this->oAction->doAction($this->aFormVars);
			exit;
		}
		
	}
	
	function insertVar($formtype, $name) {
		if ($this->type != $formtype) return;

		echo htmlspecialchars($this->aFormVars[$name]);
	}
	
	function errorClass($formtype, $name)
	{
		if ($this->type != $formtype)
			return;
			
		if (!$this->aIsValid[$name])
			echo 'error';
	}
	
	function errorIndication($formtype, $name) {
		if ($this->type != $formtype) return;
		
		if (!$this->aIsValid[$name]) 
			echo $this->strErrorIndication;
	}	
	
	function onError($formtype, $name, $text) {
		if ($this->type != $formtype) return;
		
		if (!$this->aIsValid[$name]) 
			echo $text;
	}	

	function errorSummary($formtype, $pre, $join, $post)
	{
		if ($this->type != $formtype) return;
		
		$aErrors = array();
		foreach ($this->aIsValid as $name => $isValid)
		{
			if (!$isValid)
			{
				$message = $this->aChecks[$name]->errorMessage();
				if ($message != '')
					array_push($aErrors, $message);
			}
		}
		
		if (count($aErrors) == 0)
			return;

		echo $pre;
		echo implode($join, $aErrors);
		echo $post;
	}
	
	function setSelected($formtype, $name, $val) {
		if ($this->type != $formtype) return;
		
		if ($this->aFormVars[$name] == $val)
			echo ' selected="selected"';
	}
	
	function setChecked($formtype, $name, $val, $def = 0) {
		if ($this->type != $formtype) 
		{
			if ($def == 1)
				echo ' checked="checked"';
			return;
		}
		
		if ($this->aFormVars[$name] == $val)
			echo ' checked="checked"';
	}	

}

class Action {
	function doAction(&$aVars) {}
}

class Check {
	var $errorMessage;
	
	function Check($errorMessage) 
	{
		$this->errorMessage = $errorMessage;
	}
	
	function isValid(&$verify, $value)
	{
		return false; 
	}
	
	function errorMessage() 
	{ 
		return $this->errorMessage; 
	}
}

class NonEmptyCheck extends Check 
{
	function NonEmptyCheck($errorMessage)
	{
		$this->Check($errorMessage);
	}
	
	function isValid(&$verify, $value)
	{
		$valueTrimmed = trim($value);
		return ($valueTrimmed != '');
	}
}

class RegexCheck extends Check 
{
	var $regex;
	
	function RegexCheck($regex, $errorMessage) 
	{
		$this->Check($errorMessage);
		$this->regex = $regex;
	}
	
	function isValid(&$verify, $value)
	{
		return preg_match($this->regex, $value);		
	}
}

class PostCodeCheck extends Check
{
	var $errorInvalid;
	
	function PostCodeCheck($errorMessage, $errorInvalid) 
	{
		$this->Check($errorMessage);
		$this->errorInvalid = $errorInvalid;
	}
	
	function isValid(&$verify, $value)
	{
		// check if postcode is in a format we expect
		if (!preg_match('/^[0-9]{4} ?[A-Za-z]{2}$/', $value))
			return false;
	
		// check if postcode is actually valid
		if (!$this->lookup($value))
		{
			$url = 'uitgebreid.php?verify=verify-brochure'
					   . '&naam=' . urlencode(undoMagic($_REQUEST['naam']))			
					   . '&postcode=' . urlencode(undoMagic($_REQUEST['postcode']))			
					   . '&huisnummer=' . urlencode(undoMagic($_REQUEST['huisnummer']));
			$this->errorMessage = str_replace('[uitgebreid]', htmlspecialchars($url), $this->errorInvalid);
			return false;
		}
				
		return true;
	}
	
	function lookup($code)
	{
		// 1234 AB is the only unknown code
		return (strtoupper($code) != '1234 AB');
	}
}

class HuisNummerCheck extends Check
{
	var $errorInvalid;
	
	// $errorMessage = non-empty
	// $errorInvalid = value does not correspond...
	function HuisNummerCheck($errorMessage, $errorInvalid) 
	{
		$this->Check($errorMessage);
		$this->errorInvalid = $errorInvalid;
	}

	function isValid(&$verify, $value)
	{
		$valueTrimmed = trim($value);
		if ($valueTrimmed == '')
			return false;
			
		// check if value corresponds to postcode
		$postcode = $verify->aFormVars['postcode'];
		if (!$this->checkPostcode($postcode, $value))
		{
		   // use second error message
	       $this->errorMessage = $this->errorInvalid . ' ' . $postcode;	
		   return false;
		}
		
		return true;
	}
	
	function checkPostcode($postcode, $num)
	{
		// example
		$num = intval($num);
		return (($num > 0) && ($num < 100));
	}

}

?>