<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Zend\Validator\Barcode;

class Royalmail extends AbstractAdapter
{
    protected $rows = array(
        '0' => 1, '1' => 1, '2' => 1, '3' => 1, '4' => 1, '5' => 1,
        '6' => 2, '7' => 2, '8' => 2, '9' => 2, 'A' => 2, 'B' => 2,
        'C' => 3, 'D' => 3, 'E' => 3, 'F' => 3, 'G' => 3, 'H' => 3,
        'I' => 4, 'J' => 4, 'K' => 4, 'L' => 4, 'M' => 4, 'N' => 4,
        'O' => 5, 'P' => 5, 'Q' => 5, 'R' => 5, 'S' => 5, 'T' => 5,
        'U' => 0, 'V' => 0, 'W' => 0, 'X' => 0, 'Y' => 0, 'Z' => 0,
     );

    protected $columns = array(
        '0' => 1, '1' => 2, '2' => 3, '3' => 4, '4' => 5, '5' => 0,
        '6' => 1, '7' => 2, '8' => 3, '9' => 4, 'A' => 5, 'B' => 0,
        'C' => 1, 'D' => 2, 'E' => 3, 'F' => 4, 'G' => 5, 'H' => 0,
        'I' => 1, 'J' => 2, 'K' => 3, 'L' => 4, 'M' => 5, 'N' => 0,
        'O' => 1, 'P' => 2, 'Q' => 3, 'R' => 4, 'S' => 5, 'T' => 0,
        'U' => 1, 'V' => 2, 'W' => 3, 'X' => 4, 'Y' => 5, 'Z' => 0,
    );

    /**
     * Constructor for this barcode adapter
     */
    public function __construct()
    {
        $this->setLength(-1);
        $this->setCharacters('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ');
        $this->setChecksum('royalmail');
    }

    /**
     * Validates the checksum ()
     *
     * @param  string $value The barcode to validate
     * @return bool
     */
    protected function royalmail($value)
    {
        $checksum = substr($value, -1, 1);
        $values   = str_split(substr($value, 0, -1));
        $rowvalue = 0;
        $colvalue = 0;
        foreach ($values as $row) {
            $rowvalue += $this->rows[$row];
            $colvalue += $this->columns[$row];
        }

        $rowvalue %= 6;
        $colvalue %= 6;

        $rowchkvalue = array_keys($this->rows, $rowvalue);
        $colchkvalue = array_keys($this->columns, $colvalue);
        $intersect = array_intersect($rowchkvalue, $colchkvalue);
        $chkvalue    = current($intersect);
        if ($chkvalue == $checksum) {
            return true;
        }

        return false;
    }

    /**
     * Allows start and stop tag within checked chars
     *
     * @param  string $value The barcode to check for allowed characters
     * @return bool
     */
    public function hasValidCharacters($value)
    {
        if ($value[0] == '(') {
            $value = substr($value, 1);

            if ($value[strlen($value) - 1] == ')') {
                $value = substr($value, 0, -1);
            } else {
                return false;
            }
        }

        return parent::hasValidCharacters($value);
    }
}