var INIT = "INI", SUCCESS = "OK", FAIL = "BAD", CACHE = "CACHE", MISS = "MISS";
    var Gets = [], Sets = [], state = "mshomepage";
    var targetOrigin = "*";
    var SevenDaysMS = 604800000, TimeKey = "_timeOffSet_";
    window.addEventListener("message", handleCacheRequest);
    postMessageToParent(state, INIT);

    function handleCacheRequest(e) {
        if (validateArgs(e)) {
            Sets = e.data.sets;
            Gets = e.data.gets; 
            targetOrigin = e.origin;
            state = e.data.state;
            try {
                if (window.localStorage) {
                    ls = window.localStorage;
                    for (var idx in Sets) {
                        try {
                            if (Sets[idx].key) {
                                var item = ls.getItem(Sets[idx].key);
                                item = merge(item, Sets[idx]);
                                ls.setItem(Sets[idx].key, JSON.stringify(item));
                            }
                        }
                        catch (e) {
                            postMessageToParent(state, FAIL, { key: Sets[idx].key, error: e });
                        }
                    }
                    var item = undefined;
                    for (var gKey in Gets) {
                        var getItemReq = Gets[gKey];
                        item = ls.getItem(getItemReq.key);
                        try{
                            if (!item || itemInvalid(JSON.parse(item, getItemReq._timeOffSet_))) { 
                                window.localStorage.removeItem(getItemReq.key);
                                postMessageToParent(state, MISS, { key: getItemReq.key });
                            }
                            else {
                                postMessageToParent(state, CACHE, JSON.parse(item));
                            }
                        } catch (e) {
                            postMessageToParent(state, FAIL, { key: getItemReq.key, error: e });
                        }
                    }
                }
                window.removeEventListener("message", handleCacheRequest);
            } catch (e) { postMessageToParent(state, FAIL, { error: e }); }
        }
    }
    function postMessageToParent(state, status, payload) {
        window.parent.postMessage(
            { state, status, payload },
            "https://www.microsoft.com"
        );
    }
    function validateArgs(e) { return e.data.state && (!e.sets && !e.gets) }
    function itemInvalid(i, t) { return !i || !i[TimeKey] || (Date.now() - i[TimeKey]) > SevenDaysMS; }
    function merge(trgt, src) {
        if (!trgt) {
            src[TimeKey] = Date.now();
            return src
        };
        trgt = JSON.parse(trgt);
        for (let prop in src) {
            if (hasOwn(src, prop) && !!src[prop]) {
                trgt[prop] = src[prop];
                if(!trgt[TimeKey]){
                    trgt[TimeKey] = Date.now();
                }
            }
        }
        return trgt;
    }