(function($){ 
     $.fn.extend({
        
         valid8: function(options) {            
            return this.each(function(){
                
                $(this).data('valid', false);
                
                var defaultOptions = {
                    regularExpressions: [],
                    ajaxRequests: [],
                    jsFunctions: [],
                    onLoading: defaultOnEvent,
                    onValid: defaultOnEvent,
                    onError: defaultOnEvent,
                    validationEvents: ['keyup','blur'],
                    validationFrequency: 1000,
                    values: null,
                    defaultErrorMessage: 'Required'
                };
                
                if(typeof options == 'string')
                    defaultOptions.defaultErrorMessage = options;
                    
                if(this.type == 'checkbox'){
                    defaultOptions.regularExpressions = [{expression: /^true$/, errormessage: defaultOptions.defaultErrorMessage}];
                    defaultOptions.validationEvents = ['click'];
                } else
                    defaultOptions.regularExpressions = [{expression: /^.+$/, errormessage: defaultOptions.defaultErrorMessage}];
                
                $(this).data('settings', $.extend(defaultOptions, options));
                
                initialize(this);
                
                                
            });
        },
        
                isValid: function() {
                             var valid = true;
                             this.each(function() {
                                     if ($(this).data('useValid8') == true) {
                                     validate(this);
                                     if ($(this).data('valid') == false)
                                     valid = false;
                                     }
                                     });
                             return valid;
                         },
                unValid8: function() {
                      return this.each(function() {
                              if ($(this).data('useValid8') == true)
                              kill(this);
                              });
                  }
        
    });
    
     function initializeDataObject(el) {
         $(el).data('useValid8', true);
         $(el).data('loadings', new Array());
         $(el).data('errors', new Array());
         $(el).data('valids', new Array());
         $(el).data('keypressTimer', null);
     }

    function initialize(el) {
        initializeDataObject(el);
        if($(el).attr('value').length > 0 && el.type != 'checkbox')
            validate(el);

        activate(el);
    };
    
    function activate(el) {
        var events = $(el).data('settings').validationEvents;
        if(typeof events == 'string')
            $(el)[events](function (e){ handleEvent(e, el); });
        else {
            $.each(events, function(i, event){
                $(el)[event](function (e){ handleEvent(e, el); });
            });
        }
    };
    
    function validate(el) {
        // Dispose old errors and valids
        initializeDataObject(el);

        var value;

        // Handle checkbox
        if(el.type == 'checkbox')
            value = el.checked.toString();
        else
            value = el.value;
                
        regexpValidation(value.replace(/^[ \t]+|[ \t]+$/,''),el);
    };
    
    function regexpValidation(value, el){
        
        $.each($(el).data('settings').regularExpressions, function(i, validator){
            if(!validator.expression.test(value))
                $(el).data('errors')[$(el).data('errors').length] = validator.errormessage;
            else if(validator.validmessage)
                $(el).data('valids')[$(el).data('valids').length] = validator.validmessage;
        });
        
        if($(el).data('errors').length > 0)
            onEvent(el,'error',false);
        else if($(el).data('settings').jsFunctions.length > 0) {
            functionValidation(value, el);
        }
        else if($(el).data('settings').ajaxRequests.length > 0){
            fileValidation(value, el);
        }
        else {
            onEvent(el,'valid',true);
        }
                        
    };
    
    function functionValidation(value, el){
            
        $.each($(el).data('settings').jsFunctions, function(i, validator){
            
            var v;
            if(validator.values){
                if(typeof validator.values == 'function')
                    v = validator.values();
            }
            
            var values = v || value;
            
            handleLoading(el, validator);
            
            if(validator['function'](values).valid)
                $(el).data('valids')[$(el).data('valids').length] = validator['function'](values).message;
            else
                $(el).data('errors')[$(el).data('errors').length] = validator['function'](values).message;      
        });
        
        if($(el).data('errors').length > 0)
            onEvent(el,'error',false);
        else if($(el).data('settings').ajaxRequests.length > 0) {
            fileValidation(value, el);
        }
        else {
            onEvent(el,'valid',true);
        }
    };
    
    function fileValidation(value, el){
    

        $.each($(el).data('settings').ajaxRequests, function(i, validator){
            
            var v;
            if(validator.values){
                if(typeof validator.values == 'function')
                    v = validator.values();
            }
            
            var values = v || {value: value};
            
            handleLoading(el, validator);
            
            $.post(validator.url, values,
              function(data, textStatus){
                if(data.valid) {
                    $(el).data('valids')[$(el).data('valids').length] = data.message;
                } else {
                    $(el).data('errors')[$(el).data('errors').length] = data.message;
                }
                    if($(el).data('errors').length > 0)
                        onEvent(el,'error',false);
                    else {
                        onEvent(el,'valid',true);
                    }
              }, "json");
        });
        
    };
    
    function handleEvent(e, el){
        if(e.keyCode && $(el).attr('value').length > 0) {
            clearTimeout($(el).data('keypressTimer'));
            $(el).data('keypressTimer',setTimeout(function() {
                validate(el);
            }, $(el).data('settings').validationFrequency));
        }
        else if(e.keyCode && $(el).attr('value').length <= 0)
            return false;
        else {
            validate(el);
        }
    };
    
    function handleLoading(el, validator) {
        if(validator.loadingmessage){
            $(el).data('loadings')[$(el).data('loadings').length] = validator.loadingmessage;
            onEvent(el,'loading',false);
        }
    };
    
    function defaultOnEvent(messages, el, event){
        setParentClass(el,event);
        setMessage(messages,el);
    }
    
    function onEvent(el, event, valid) {
        
        var capitalizedEvent = event.substring(0,1).toUpperCase() + event.substring(1,event.length);
        
        $(el).data(event, valid);
        $(el).data('settings')['on'+capitalizedEvent]($(el).data(event+'s'),el,event);
    }
    
    function setParentClass(el,className) {
        var parent = $(el).parent();
        parent[0].className = (parent[0].className.replace(/(^\s|(\s*(loading|error|valid)))/g,'') + ' ' + className).replace(/^\s/,'');
    }
    
    function setMessage(messages,el) {
        var parent = $(el).parent();
        var elementId = el.id + "ValidationMessage";
        var elementClass = 'validationMessage';         
        if(!$('#'+elementId).length > 0)
            parent.append('<span id="' + elementId + '" class="' + elementClass + '"></span>');

        $('#'+elementId).html("");
        $('#'+elementId).text(messages[0]);
    };
 function killDataObject(el) {
$(el).data('useValid8', false);
};

function kill(el) {
deActivate(el);
killDataObject(el);
defaultOnEvent('', el, '');
};

function deActivate(el) {
var events = $(el).data('settings').validationEvents;
if (typeof events == 'string')
$(el).unbind(events);
else {
$.each(events, function(i, event) {
$(el).unbind(event);
});
}
};

    
})(jQuery);