; (function($) {
	$.fn.extend({
		validate: function(options) {

			var defaults = {
				rules: {},
				messages: {}
			};

			options = $.extend(defaults, options);

			var _isvalid = true;
			var rules = options.rules;
			$(document).data('validator-messages', options.messages);

			$.each(rules, function(elem, rule) {
				var el = $('#' + elem);

				el.keyup(function() {
					$(this).isvalid(el, rule);
				});

				if (!$(this).isvalid(el, rule)) _isvalid = false;
			});
			return _isvalid;
		},

		isvalid: function(elem, rule) {
			var result = true;
			var message = $(document).data('validator-messages')[elem.attr('id')];

			hideError();

			$.each(rule, function(name, v) {
				switch (name) {
					case 'required':
						if (v === true) {
							if (!$(this).required(elem)) {
								showError(message && message.required ? message.required : $(this).messages.required);
								result = false;
							}
						}
						break;
					case 'minlength':
						if (result && !$(this).minlength(elem, Number(v))) {
							showError(message && message.minlength ? message.minlength : $(this).format($(this).messages.minlength, [v]));
							result = false;
						}
						break;

					case 'email':
						if (result && v === true) {
							if (!$(this).email(elem)) {
								showError(message && message.email ? message.email : $(this).messages.email);
								result = false;
							}
						}
						break;

					case 'equalTo':
						if (result && !$(this).equalTo(elem, $('#' + v))) {
							showError(message && message.equalTo ? message.equalTo : $(this).messages.equalTo);
							result = false;
						}
						break;
				}
			});

			function showError(text) {
				elem.parent().append($('<div class="clear" />'));
				elem.parent().append($('<div class="error">' + text + '</div>'));
			}

			function hideError() {
				elem.parent().find('.error').remove();
			}

			return result;
		},

		messages: {
			required: 'Это поле необходимо заполнить.',
			minlength: 'Пожалуйста, введите не меньше {0} символов.',
			email: 'Пожалуйста, введите корректный адрес электронной почты.',
			equalTo: 'Пожалуйста, введите такое же значение ещё раз.'
		},

		format: function(text, params) {
			$.each(params, function(i, n) {
				text = text.replace(new RegExp("\\{" + i + "\\}", "g"), n);
			});
			return text;
		},

		required: function(elem) {
			return $.trim(elem.val()).length > 0
		},

		minlength: function(elem, param) {
			return $.trim(elem.val()).length >= param
		},

		email: function(elem) {
			return /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i.test(elem.val());
		},

		equalTo: function(elem, equal) {
			return $.trim(elem.val()) == $.trim(equal.val());
		}
	});
})(jQuery);