<?php
/**
 * Contains Validation functions
 *
 * @class 		woocommerce_validation
 * @package		WooCommerce
 * @category	Class
 * @author		WooThemes
 */

class woocommerce_validation {
	
	/**
	 * Validates an email using wordpress native is_email function
	 *
	 * @param   string	email address
	 * @return  boolean
	 */
	function is_email( $email ) {
		return is_email( $email );
	}
	
	/**
	 * Validates a phone number using a regular expression
	 *
	 * @param   string	phone number
	 * @return  boolean
	 */
	function is_phone( $phone ) {
		if (strlen(trim(preg_replace('/[\s\#0-9_\-\+\(\)]/', '', $phone)))>0) return false;
		return true;
	}
	
	/**
	 * Checks for a valid postcode (UK)
	 *
	 * @param   string	postcode
	 * @param	string	country
	 * @return  boolean
	 */
	function is_postcode( $postcode, $country ) {
		if (strlen(trim(preg_replace('/[\s\-A-Za-z0-9]/', '', $postcode)))>0) return false;
		if ($country=='GB') :
			return $this->is_GB_postcode( $postcode );
		endif;
		return true;
	}
	
	/* Author: John Gardner */
	function is_GB_postcode( $toCheck ) {
 
		// Permitted letters depend upon their position in the postcode.
		$alpha1 = "[abcdefghijklmnoprstuwyz]";                          // Character 1
		$alpha2 = "[abcdefghklmnopqrstuvwxy]";                          // Character 2
		$alpha3 = "[abcdefghjkstuw]";                                   // Character 3
		$alpha4 = "[abehmnprvwxy]";                                     // Character 4
		$alpha5 = "[abdefghjlnpqrstuwxyz]";                             // Character 5
		
		// Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
		$pcexp[0] = '^('.$alpha1.'{1}'.$alpha2.'{0,1}[0-9]{1,2})([0-9]{1}'.$alpha5.'{2})$';
		
		// Expression for postcodes: ANA NAA
		$pcexp[1] =  '^('.$alpha1.'{1}[0-9]{1}'.$alpha3.'{1})([0-9]{1}'.$alpha5.'{2})$';
		
		// Expression for postcodes: AANA NAA
		$pcexp[2] =  '^('.$alpha1.'{1}'.$alpha2.'[0-9]{1}'.$alpha4.')([0-9]{1}'.$alpha5.'{2})$';
		
		// Exception for the special postcode GIR 0AA
		$pcexp[3] =  '^(gir)(0aa)$';
		
		// Standard BFPO numbers
		$pcexp[4] = '^(bfpo)([0-9]{1,4})$';
		
		// c/o BFPO numbers
		$pcexp[5] = '^(bfpo)(c\/o[0-9]{1,3})$';
		
		// Load up the string to check, converting into lowercase and removing spaces
		$postcode = strtolower($toCheck);
		$postcode = str_replace (' ', '', $postcode);
		
		// Assume we are not going to find a valid postcode
		$valid = false;
		
		// Check the string against the six types of postcodes
		foreach ($pcexp as $regexp) {
		
			if (ereg($regexp,$postcode, $matches)) {
				
				// Load new postcode back into the form element  
				$toCheck = strtoupper ($matches[1] . ' ' . $matches [2]);
				
				// Take account of the special BFPO c/o format
				$toCheck = ereg_replace ('C\/O', 'c/o ', $toCheck);
				
				// Remember that we have found that the code is valid and break from loop
				$valid = true;
				break;
			}
		}

		if ($valid){return true;} else {return false;};
	}
	
	/**
	 * Format the postcode according to the country and length of the postcode
	 *
	 * @param   string	postcode
	 * @param	string	country
	 * @return  string	formatted postcode
	 */
	function format_postcode( $postcode, $country ) {
		$postcode = strtoupper(trim($postcode));
		$postcode = trim(preg_replace('/[\s]/', '', $postcode));
		
		if ($country=='GB') :
			if (strlen($postcode)==7) 
				$postcode = substr_replace($postcode, ' ', 4, 0);
			else 
				$postcode = substr_replace($postcode, ' ', 3, 0);
		endif;
		return $postcode;
	}
	
}