/**
 * create validator for form
 * @param {formId} is id of form
 */
function formValidationBuilder(formSelector) {
    formSelector = formSelector || 'form';
    var fields = $(formSelector).find('[data-val="true"]').not('[type=hidden]');

    if (fields.length === 0) {
        return null;
    }

    var validators = {};
    $(fields).each(function (idx, field) {
        var $field = $(field);
        var require = $field.attr('data-val-required');
        var max = $field.attr('data-val-length-max');
        var min = $field.attr('data-val-length-min');
        var lenmsg = $field.attr('data-val-length');
        var regex = $field.attr('data-val-regex');
        var regex_pattern = $field.attr('data-val-regex-pattern');
        var groupClass = $field.closest('div').attr('class') || '';
        var group = groupClass.indexOf('form-group') === -1 ? '.form-group' : null;
        var name = field.name;

        validators[name] = new validatorBuilder(
            name,
            require ? { msg: require } : null,
            max ? { val: max, msg: lenmsg } : null,
            min,
            group,
            regex_pattern ? { regexp: regex_pattern, message: regex } : null);
    });

    var option = {
        icons: {
            valid: 'glyphicon glyphicon-ok',
            invalid: 'glyphicon glyphicon-remove',
            validating: 'glyphicon glyphicon-refresh'
        },
        fields: validators
    };

    return $(formSelector).bootstrapValidator(option);
}