(function($) {

	var rules = {
		required: { 
			selector: '.required', 	
			rule: function($el) { 
				return ($el.attr('type') != 'checkbox' && $el.val().length > 0) || $el.attr('checked'); 
			} 
		},
		email: { selector: '.email', rule: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i },
		date: { selector: '.date', rule: /^[0-3]?[0-9]\/[0123]?[0-9]\/[12][09][0-9][0-9]$/ },
		numeric: { selector: '.numeric', rule: /^[\d]*$/ }
	};


	var methods = {
		init: function(options) {

			var settings = {
				'refocus':			true,
				'invalidClass': 	'alert',
				'invalidSelector': 	'label[for=<<id>>]',
				'invalidCallback': 	null,
				'validCallback': 	null,
				'smother': 			false
			};

			if(options) {
				$.extend(settings, options);
			}

			return this.each(function() {
				
				var $this = $(this);

				$this.bind('submit.legit', function(e) {

					if(settings.smother) {
						e.preventDefault();
					}
					
					var feedback = '', focus = false, tmpSelector;

					$this.find('input[type="password"]:enabled, input[type="file"]:enabled, input[type="text"]:enabled, input[type="checkbox"]:enabled, select:enabled, textarea:enabled').each(function() {
						
						var $el = $(this), valid = true;

						for(var i in rules) {

							if($el.is(rules[i].selector)) {
								
								if(i != 'required' && $el.val().length == 0) {
									//the field is empty and only the required rule tests empty fields
									continue;
								}

								if(typeof rules[i].rule.test == 'function') {
									if(!rules[i].rule.test($el.val())) {
										valid = false;
									}
								}
								else if(typeof rules[i].rule == 'function' && !rules[i].rule($el)) {
									valid = false;
								}

							}

						}

						tmpSelector = false;
						if(settings.invalidSelector) {
							tmpSelector = settings.invalidSelector.replace(/<<id>>/g, $el.attr('id')).replace(/<<name>>/g, $el.attr('name'));
						}

						if(!valid) {
							
							if(settings.invalidClass) {
								if(tmpSelector) {
									$(tmpSelector).addClass(settings.invalidClass);
								}
								else {
									$el.addClass(settings.invalidClass);
								}
							}

							feedback += $el.attr('title') + "\n";
							if(!focus) focus = $el;
						}
						else {
							
							if(settings.invalidClass) {
								if(tmpSelector) {
									$(tmpSelector).removeClass(settings.invalidClass);
								}
								else {
									$el.removeClass(settings.invalidClass);
								}
							}
						}

					});

					if(feedback.length > 0) {

						if(settings.refocus) focus.focus();

						if(typeof settings.invalidCallback == 'function') {
							return settings.invalidCallback(feedback);
						}
						else {
							alert(feedback);
							return false;
						}
					}

					if(typeof settings.validCallback == 'function') {
						return settings.validCallback(feedback);
					}
					else {
						return true;
					}
				});
			});
		}, //init
		
		destroy: function() {

			this.unbind('.legit');

			return this;
		}, //destroy

		addRule: function(name, rule) {

			rules[name] = rule;

			return this;
		}
	};

	$.fn.legit = function(method) {
		if(methods[method]) {
			return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
		}
		else if(typeof method === 'object' || !method) {
			return methods.init.apply(this, arguments);
		}
		else {
			$.error('Method ' + method + ' does not exist on jQuery.legit');
		}
	}

})(jQuery);