<?php

class Cardpay_model extends CI_Model {

    function __construct() {
        
    }

    public function verifyCardData($data){
        $error_status = false;
        $errorArray = array ();
    /*
           $cd['cardnumber'] =  $this->input->post('cardnumber');
            $cd['exp_month'] =   $this->input->post('exp_month');
            $cd['exp_year'] =    $this->input->post('exp_year');
            $cd['cvc'] =         $this->input->post('cvc');
            $cd['description']=  $this->input->post('description');
    */
    
        if ( strlen( $data['cvc'] ) == 0 ){
            $error_status = true;
            $errorArray[]="Enter valid card CVV";
        }

       if ( strlen( $data['cardnumber'] ) == 0 || $this->luhn_check( $data['cardnumber'] ) == false){
            $error_status = true;
            $errorArray[]="Enter valid card number";
        }
        
        if ( strlen( $data['exp_year'] ) == 0 || $data['exp_year'] < date('Y') ){
            $error_status = true;
            $errorArray[]="Enter valid card expiration date";
        }
        else{

            // let us test the month now
        }

        if ( strlen( $data['description'] ) == 0 ){
            $error_status = true;
            $errorArray[]="Enter name on card";
        }

        return [
            "error_status" => $error_status,
            "error_message" => $errorArray
        ];
    }

    public function verifyCCNumber($cardNumber) {
        
            return $this->luhn_check($cardNumber);
    }

    /* Luhn algorithm number checker - (c) 2005-2008 shaman - www.planzero.org *
    * This code has been released into the public domain, however please      *
    * give credit to the original author where possible.                      */

    private function luhn_check($number) {

        // Strip any non-digits (useful for credit card numbers with spaces and hyphens)
        $number=preg_replace('/\D/', '', $number);
    
        // Set the string length and parity
        $number_length=strlen($number);
        $parity=$number_length % 2;
    
        // Loop through each digit and do the maths
        $total=0;
        for ($i=0; $i<$number_length; $i++) {
        $digit=$number[$i];
        // Multiply alternate digits by two
        if ($i % 2 == $parity) {
            $digit*=2;
            // If the sum is two digits, add them together (in effect)
            if ($digit > 9) {
            $digit-=9;
            }
        }
        // Total up the digits
        $total+=$digit;
        }
    
        // If the total mod 10 equals 0, the number is valid
        return ($total % 10 == 0) ? TRUE : FALSE;
    
    }

}