(function($) {
    /*
    Validation Singleton
    */
	var Validation = function() {        
		// Default
		var maxlen = 50;
		var minlen = 4;
		
        var rules = {
            email : {
               check: function(value, field) {
                   
                   if(value)
                       return testPattern(value, 'email');
                   return true;
               },
               msg : "Epostadresse ikke gyldig"
            },
            url : {
               check : function(value, field) {

                   if(value)
                       return testPattern(value, "^https?://(.+\.)+.{2,4}(/.*)?$");
                   return true;
               },
               msg : "Adresse ikke godtatt"
            },
            required : {
               check: function(value, field) {
					if($(field).attr("type") == "checkbox"){
						if($(field).attr("checked"))
							return true;
						else
							return false;
					}
					if($(field).attr("type") != "checkbox"){
						if(value)
							return true;
						else
							return false;
					}
               },
               msg : "Dette er et påkrevd felt"
            },
            minlength : {
				check: function(value, field) {
					if($(field).attr("minlength") != null){
						minlen = $(field).attr("minlength");
					}
				   
					if(value.length >= minlen)
						return true;
					else
						return false;
               },
               msg : "For få tegn"
            },
			maxlength : {
				check: function(value, field) {
					if($(field).attr("maxlength") != null){
						maxlen = $(field).attr("maxlength");
					}
				   
					if(value.length <= maxlen)
						return true;
					else
						return false;
				},
				msg : "For mange tegn"
			}
		}
        var testPattern = function(value, pattern) {
			var regExp;
			
			if(pattern == 'email'){
				regExp = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
			}
			else {
				regExp = new RegExp(pattern,"");
			}
            return regExp.test(value);
        }
        return {
            
            addRule : function(name, rule) {

                rules[name] = rule;
            },
            getRule : function(name) {

                return rules[name];
            }
        }
    }
    
    /* 
    Form factory 
    */
    var Form = function(form) {
        
        var fields = [];
    
        form.find("[validation]").each(function() {
            var field = $(this);
            if(field.attr('validation') !== undefined) {
                fields.push(new Field(field));
            }
        });
        this.fields = fields;
    }
    Form.prototype = {
        validate : function() {

            for(field in this.fields) {
                
                this.fields[field].validate();
            }
        },
        isValid : function() {
            
            for(field in this.fields) {
                
                if(!this.fields[field].valid) {
            
                    this.fields[field].field.focus();
                    return false;
                }
            }
            return true;
        }
    }
    
    /* 
    Field factory 
    */
    var Field = function(field) {

        this.field = field;
        this.valid = false;
        this.attach("change");
    }
    Field.prototype = {
        
        attach : function(event) {
        
            var obj = this;
            if(event == "change") {
                obj.field.bind("change",function() {
                    return obj.validate();
                });
            }
            if(event == "keyup") {
                obj.field.bind("keyup",function(e) {
                    return obj.validate();
                });
            }
        },
        validate : function() {
            
            var obj = this,
                field = obj.field,
                errorClass = "errorlist",
                errorlist = $(document.createElement("ul")).addClass(errorClass),
                types = field.attr("validation").split(" "),
                container = field,
                errors = []; 
            
            field.next(".errorlist").remove();
			
            for (var type in types) {

                var rule = $.Validation.getRule(types[type]);
                if(!rule.check(field.val(), field)){
                    container.addClass("input_notvalid");
                    errors.push(rule.msg);
                }
            }
			
            if(errors.length) {
                obj.field.unbind("keyup")
                obj.attach("keyup");
                field.after(errorlist.empty());
                for(error in errors) {
                
                    errorlist.append("<li>"+ errors[error] +"</li>");
                }
                obj.valid = false;
            } 
            else {
                errorlist.remove();
				container.removeClass("input_notvalid");
                obj.valid = true;
            }
        }
    }
    
    /*
    Validation extends jQuery prototype
    */
    $.extend($.fn, {
        
        validation : function() {
            
            var validator = new Form($(this));
            $.data($(this)[0], 'validator', validator);
            
            $(this).bind("submit", function(e) {
                validator.validate();
                if(!validator.isValid()) {
                    e.preventDefault();
                }
            });
        },
        validate : function() {
            
            var validator = $.data($(this)[0], 'validator');
            validator.validate();
            return validator.isValid();
            
        }
    });
    $.Validation = new Validation();
})(jQuery);