/**
 * vin validator
 *
 * @link        http://formvalidation.io/validators/vin/
 * @author      https://twitter.com/nghuuphuoc
 * @copyright   (c) 2013 - 2015 Nguyen Huu Phuoc
 * @license     http://formvalidation.io/license/
 */
(function($) {
    FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
        'en_US': {
            vin: {
                'default': 'Please enter a valid VIN number'
            }
        }
    });

    FormValidation.Validator.vin = {
        /**
         * Validate an US VIN (Vehicle Identification Number)
         *
         * @param {FormValidation.Base} validator The validator plugin instance
         * @param {jQuery} $field Field element
         * @param {Object} options Consist of key:
         * - message: The invalid message
         * @returns {Boolean}
         */
        validate: function(validator, $field, options) {
            var value = validator.getFieldValue($field, 'vin');
            if (value === '') {
                return true;
            }

            // Don't accept I, O, Q characters
            if (!/^[a-hj-npr-z0-9]{8}[0-9xX][a-hj-npr-z0-9]{8}$/i.test(value)) {
                return false;
            }

            value = value.toUpperCase();
            var chars   = {
                    A: 1,   B: 2,   C: 3,   D: 4,   E: 5,   F: 6,   G: 7,   H: 8,
                    J: 1,   K: 2,   L: 3,   M: 4,   N: 5,           P: 7,           R: 9,
                            S: 2,   T: 3,   U: 4,   V: 5,   W: 6,   X: 7,   Y: 8,   Z: 9,
                    '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, '0': 0
                },
                weights = [8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2],
                sum     = 0,
                length  = value.length;
            for (var i = 0; i < length; i++) {
                sum += chars[value.charAt(i) + ''] * weights[i];
            }

            var reminder = sum % 11;
            if (reminder === 10) {
                reminder = 'X';
            }

            return (reminder + '') === value.charAt(8);
        }
    };
}(jQuery));
