;(function(exports){'use strict';var SettingsHelper=function(key,defaultValue){var SETTINGS_KEY=key;var _settings=navigator.mozSettings;var _value=null;var _defaultValue=defaultValue;var _isReady=false;var _callbacks=[];var _return=function sh_return(callback){if(!callback){return;}
callback.apply(null,Array.prototype.slice.call(arguments,1));};var _ready=function sh_ready(callback){if(!callback){return;}
if(_isReady){callback();}else{_callbacks.push(callback);}};var _getValue=function sh_getValue(callback){var req=_settings.createLock().get(SETTINGS_KEY);req.onsuccess=function(){_return(callback,req.result[SETTINGS_KEY]);};req.onerror=function(){console.error('Error getting '+SETTINGS_KEY+'.');_return(callback,null);};};var _setValue=function sh_setValue(value,callback){var obj={};obj[SETTINGS_KEY]=value;var req=_settings.createLock().set(obj);req.onsuccess=function(){_return(callback);};req.onerror=function(){console.error('Error setting '+SETTINGS_KEY+'.');_return(callback);};};var _valuechanged=function sh_valuehanged(e){_value=e.settingValue;};var _init=function sh_init(callback){_getValue(function(value){_value=value?value:_defaultValue;_return(callback);});_settings.addObserver(SETTINGS_KEY,_valuechanged);};_init(function(){_isReady=true;_callbacks.forEach(function(callback){callback();});});return{get:function(callback){_ready(function(){_return(callback,_value?_value:_defaultValue);});},set:function(value,callback){_ready(function(){_setValue(value,_return.bind(null,callback));});},uninit:function(){_settings.removeObserver(SETTINGS_KEY,_valuechanged);}};};exports.SettingsHelper=SettingsHelper;})(this);