var resourceHelper = {};

resourceHelper.services = null;
resourceHelper.language = null;
resourceHelper.resources = null;
resourceHelper.sessionKey = "PRM_Resource_Strings";

resourceHelper.init = function (services, language) {
	resourceHelper.services = services;
	resourceHelper.language = language;
	resourceHelper.sessionKey += language;
	//sessionStorage.removeItem(resourceHelper.sessionKey);
	resourceHelper.loadResource();
}

resourceHelper.loadResource = function () {
	if (typeof (Storage) !== "undefined") {
		try {
			if (sessionStorage.getItem(resourceHelper.sessionKey) !== null && sessionStorage.getItem(resourceHelper.sessionKey) !== "") {
				resourceHelper.resources = JSON.parse(sessionStorage.getItem(resourceHelper.sessionKey));
			} else {
				resourceHelper.resources = null;
			}
		}
		catch (e) {
			resourceHelper.resources = null;
		}
	}
	if (resourceHelper.resources === null) {
		$.getJSON(resourceHelper.services + 'ResourceHelper.ashx?language=' + resourceHelper.language, { format: "json" })
			.done(
				function (data) {
					if (typeof (Storage) !== "undefined") {
						sessionStorage.setItem(resourceHelper.sessionKey, JSON.stringify(data.resources));
					}
					resourceHelper.resources = data.resources;
				}
			);
	}
}

resourceHelper.getString = function (key) {
	return resourceHelper.getStringWithFallback(key, "");
}

resourceHelper.getStringWithFallback = function (key, fallback) {
	var value = resourceHelper.retrieveResourceValue(key);
	if (value === null || value === "" || value === undefined) {
		value = fallback;
	}
	return value;
}

resourceHelper.retrieveResourceValue = function (key) {
	var value = "";
	if (resourceHelper.resources != null) {
		var v = resourceHelper.resources[key];
		if (v !== null) {
			value = v;
		}
	}
	return value;
}