(function($) {	
	$.fn.simplevalidation = function(settings) {
		var config = {	
			required_selector: "input.required",
			invalid_field_class: "invalid",
			invalid_form_class: "frm-invalid",
			field_parent: ".field",
			on_valid_callback: function() {},
			on_invalid_callback: function() {}
		};

		if (settings) $.extend(config, settings);

		var regex_email = /^((([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])))\.?$/i,
			regex_phone = /.{7,}/, ///(\d{7,})/,
			regex_file = /\.(doc|docx|jpg|pdf|png|txt)$/,
			is_form_valid = true;				

		this.each(function(i) {	
			var $this = $(this);				
			
			$this.find(config.required_selector).blur(function() {
				// validate each field on blur
				$(this).trigger("validate_field");
			}).bind("validate_field", function() {
				var is_field_valid = false,
					$required_field = $(this);			


				// validation checks for classes
				if($required_field.hasClass("required-email"))
				{
					is_field_valid = regex_email.test($required_field.val());
				}
				else if($required_field.hasClass("required-tel"))
				{
					is_field_valid = regex_phone.test($required_field.val());
				}
				else if($required_field.hasClass("required-file"))
				{
					is_field_valid = regex_file.test($required_field.val());
				}
				else
				{
					is_field_valid = !!$.trim("" + $required_field.val()); // is not empty
				}




				if(is_field_valid)
				{
					$required_field.parents(config.field_parent).removeClass(config.invalid_field_class);
				}
				else
				{
					$required_field.parents(config.field_parent).addClass(config.invalid_field_class);
				}

				is_form_valid &= is_field_valid;
			});
			
			$this.submit(function() {				
				is_form_valid = true;
								
				// validate each field on submit
				$this.find(config.required_selector).each(function() {
					$(this).trigger("validate_field");
				});
				
			
				if(is_form_valid)
				{
					$this.removeClass(config.invalid_form_class);
					if($.isFunction(config.on_valid_callback))
					{
						config.on_valid_callback($this);
					}
				}
				else
				{
					$this.addClass(config.invalid_form_class);
					$this.find(config.field_parent + "." + config.invalid_field_class + ":first").find("input").focus();
					if($.isFunction(config.on_invalid_callback))
					{
						config.on_invalid_callback($this);
					}
				}
				
				return false;
			});
		});

		return this;
	};
})(jQuery);