var CookieHelper = {
    
    namespace: "",

    ////////////////// BASE METHODS /////////////////////

    createCookie : function (name, value, days) {
	    var expires;
	    name = this.namespace + "." + name;
	    if (days) {
		    var date = new Date();
		    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
		    expires = "; expires=" + date.toGMTString();
	    }
	    else expires = "";
	    document.cookie = name + "=" + value + expires + "; path=/";
    },

    readCookie : function (name) {
        name = this.namespace + "." + name;
        var nameEQ = name + "=";
	    var ca = document.cookie.split(';');
	    for (var i = 0; i < ca.length; i++) {
		    var c = ca[i];
		    while (c.charAt(0) == ' ') c = c.substring(1, c.length);
		    if (c.indexOf(nameEQ) === 0)
		    {
		        return c.substring(nameEQ.length, c.length);    
		    } 
	    }
	    return null;
    },

    eraseCookie : function eraseCookie(name) {
        name = this.namespace + "." + name;
        this.createCookie(name, "", -1);
    },

    areCookiesEnabled : function () {
	    var r = false;
	    this.createCookie("testing", "Hello", 1);
	    if (this.readCookie("testing") !== null) {
		    r = true;
		    this.eraseCookie("testing");
	    }
	    return r;
    },
    
    ////////////////// BACKBONE MODELS /////////////////////

    //reads backbone model properties if blank
    readModel : function(model, fields)
    {
        for (var i = 0; i < fields.length; i++)
        {
            var fieldName = fields[i];
            if (!model.get(fieldName))
            {
                var value = this.readCookie(fieldName);
                model.set(fieldName, value);
            }
        }
    },
    
    writeModel : function(model, fields)
    {
        for (var i = 0; i < fields.length; i++)
        {
            var fieldName = fields[i];
            var value = model.get(fieldName);
            if (value || value === false || value === "")
            {
                this.createCookie(fieldName, value, 30);
            }
        }
    },

    ////////////////////// CSV ARRAYS //////////////////////////

    //adds value to cookie array if it is not there
    addToArray : function(value, key, days)
    {
        var array = this.getArray(key);

        if (array.indexOf(value) === -1)
        {
            array.push(value);
            this.setArray(array, key, days);
        }
        
    },

    //removes value from array
    removeFromArray : function(value, key)
    {
        var array = this.getArray(key);
        var index = array.indexOf(value);
        if (index >= 0)
        {
            array.splice(index, 1);
            this.setArray(array, key);
        }
    },

    //gets array from cookie (or creates new one)
    getArray : function(key)
    {
        var cookieValue = this.readCookie(key);

        var array = [];
        if (cookieValue)
        {
            array = JSON.parse(cookieValue);
        }

        return array;
    },

    
    //sets array as cookie
    setArray : function(array, key, days)
    {
        days = typeof days === 'undefined' ? 1000 : days;

        var cookieValue = JSON.stringify(array);
        this.createCookie(key, cookieValue, days);
    },



    //////////////// test ///////////////////
    test : function()
    {
        var cookieKey = "CookieHelperTest";

        console.log("cookies enabled: " + CookieHelper.areCookiesEnabled());

        CookieHelper.createCookie(cookieKey, "", 1000);

        //array tests
        CookieHelper.addToArray(1, cookieKey);
        CookieHelper.addToArray(2, cookieKey);
        console.log("expected: 1, 2");
        console.log("real: " + CookieHelper.readCookie(cookieKey));

        CookieHelper.removeFromArray(1, cookieKey);
        console.log("expected: 2");
        console.log("real: " + CookieHelper.readCookie(cookieKey));

        var array = [3, 4, 5];
        CookieHelper.setArray(array, cookieKey);
        console.log("expected: 3, 4, 5");
        console.log("real: " + CookieHelper.readCookie(cookieKey));

        CookieHelper.removeFromArray(3, cookieKey);
        CookieHelper.removeFromArray(5, cookieKey);
        console.log("expected: 4");
        console.log("real: " + CookieHelper.readCookie(cookieKey));

        var test = CookieHelper.getArray(cookieKey);
        console.log("type: " + typeof test + ", array: " + test);
    },
};