"use strict";

angular.module("vocabulary")
    .service("loginAndContinueService", ["$location", "IS_AUTHORIZED_AS_TEACHER", function ($location, IS_AUTHORIZED_AS_TEACHER) {
        var locationKey = "loginAndContinueLocation";
        var dataKey = "loginAndContinueData";
        var urlKey = "continueAfterLogin";

        return {
            loginIfNotAuthorized: loginIfNotAuthorized,
            getDataAndClearCache: getDataAndClearCache,
            isDataInCache: isDataInCache,
            saveData: saveData,
            isAuthorized: isAuthorized
        };

        function isAuthorized() {
            return IS_AUTHORIZED_AS_TEACHER;
        }

        function loginIfNotAuthorized(data, redirectUrl) {
            if (IS_AUTHORIZED_AS_TEACHER) {
                return true;
            }
            saveData(data);
            redirectUrl = redirectUrl || $location.url();
            doLogin(redirectAfterLoginUrl(redirectUrl));
        }

        function saveData(data) {
            var currUrl = $location.url();
            sessionStorage.setItem(locationKey, currUrl);
            var dataAsString = JSON.stringify(data);
            sessionStorage.setItem(dataKey, dataAsString);
        }

        function getDataAndClearCache() {
            var currUrl = $location.url();
            var result = null;
            if (currUrl.indexOf(urlKey) >= 0) {
                $location.search(urlKey, null);
                currUrl = $location.url();
                if (currUrl == sessionStorage.getItem(locationKey)) {
                    var dataAsString = sessionStorage.getItem(dataKey);
                    if (dataAsString && dataAsString !== 'undefined') {
                        result = JSON.parse(dataAsString);
                    }
                }
            }
            sessionStorage.setItem(locationKey, "");
            sessionStorage.setItem(dataKey, "");
            return result;
        }

        function isDataInCache(itemKey) {
            var dataAsString = sessionStorage.getItem(dataKey);
            if (dataAsString && dataAsString !== 'undefined') {
                var json = JSON.parse(dataAsString);
                return json ? !!json[itemKey] : false;
            }
        }

        function redirectAfterLoginUrl(url) {
            var separatorChar = url.indexOf("?") >= 0 ? "&" : "?";
            return "/#!" + url + separatorChar + urlKey;
        }
    }]);