/**
 * Storage Utility
 * 
 * Used for File Management
 */
var Storage = function() {};
Storage.prototype = {
    /**
     * Initialise
     * 
     * Run when the Utility is created
     */
    init: function UtilStorageInit() {
        if (typeof localStorage !== 'undefined') {
            this._localStorageAvailable = true;
        } else {
            this._localStorageAvailable = false;
        }
        
        this.configureStorage();
    },
    
    /**
     * Configure Storage
     * 
     * If Local Storage is available then use Cookies
     * 
     * @returns {Storage}
     */
    configureStorage: function Storage() {
        if (this._localStorageAvailable) {
            // as we have local storage create a storage object with required functions
            this.save = function StorageSave(id, data) {
                localStorage[id] = JSON.stringify(data);
            };
            this.load = function StorageLoad(id) {
                var data = localStorage[id];
                if (data === null || !data)
                    return null;
                return JSON.parse(data);
            };
            this.clear =  function StorageClear(id) {
                try {
                    localStorage[id] = null;
                } catch(e) {
                    alert(e);
                }
            };
        } else {
            // no local storage so use the old cookie approach
            this.log('localStorage NOT supported', 'warning');
            this.save = function StorageSave(id, data) {
                document.cookie = (id) + "=" + encodeURIComponent(JSON.stringify(data));
            };
            this.load = function StorageLoad(id) {
                var s = "; " + document.cookie + ";", p = s.indexOf("; " + id + "=");
                if (p < 0)
                    return "";
                p = p + id.length + 3;
                var p2 = s.indexOf(";", p + 1);
                return JSON.parse(decodeURIComponent(s.substring(p, p2)));
            };
            this.clear = function StorageClear(id) {
                // TODO: This
            };
        }
        
        try {
            delete this._localStorageAvailable;
            delete this.init;
            delete this.configureStorage;
            delete this.__proto__.init;
            delete this.__proto__.configureStorage;
        } catch(e) {};
    }
};