var endpoint;
var browserStr = navigator.userAgent.toLowerCase();
var browser='unknown';
    if((browserStr.indexOf("opera") != -1) || (browserStr.indexOf('opr') != -1) ){
        browser ='opera';
    }else if(browserStr.indexOf("ubrowser") != -1 )    {
        browser ='ucbrowser';
    } else if(browserStr.indexOf("chrome") != -1 ){
        browser ='chrome';
    }else if(browserStr.indexOf("safari") != -1){
        browser ='safari';
    }else if(browserStr.indexOf("firefox") != -1 ) {
        browser ='firefox';
    }else if((browserStr.indexOf("msie") != -1 ) || (!!document.documentMode == true )) {
        browser ='ie';
    }else{
        browser ='unknown';
    }

function store_subscription(subscription){
    if (typeof subscription == 'undefined') {
        console.log("subecription denied/ignored");
        return;
    }

    endpoint = subscription.endpoint;
    var post = new XMLHttpRequest();
    post.open('POST', '/register_subs.php');
    endpointSections = endpoint.split('/');
    subscriptionId = endpointSections[endpointSections.length - 1];

    var curUrl = encodeURI(window.location.href);
    var refUrl = encodeURI(document.referrer);
    var jsn = subscription.toJSON();    //ref=> https://developer.mozilla.org/en-US/docs/Web/API/PushSubscription
    var params = "endpoint=" + endpoint;
    params += "&subscriptionId=" + subscriptionId;
    params += "&browser=" + browser;
    params += "&curUrl=" + curUrl;
    params += "&refUrl=" + refUrl;
    params += "&p256dh=" + jsn.keys.p256dh;
    params += "&auth=" + jsn.keys.auth;

    console.log("saved data: "+params);
    post.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    post.send(params);
    return;
}

function Unsubscribe() {
    if(confirm("Are you sure to unsubscribe?")){  
        navigator.serviceWorker.getRegistration()
        .then(function(registration) {
            registration.unregister().then(function(e){
                console.log('user unsubscribed', e);
            });
        });
        return true;
    }else{
        return false;
    }
}

function addShadow(){
            $('html, body').css({overflow: 'hidden', height: '100%'});
            var docHeight = $(document).height();
            $("#overlay").height(docHeight).show();
            if(browser =='opera'){
                $("#overlay").css("padding-left","45%").css("padding-top","170px")
            }
}
function removeShadow(){
            $("#overlay").hide();
            $('html, body').css({overflow: 'auto', height: 'auto'});

}
function  setCookie(cookieName, value, expDays) {
    var expDate = new Date();
    expDate.setDate(expDate.getDate() + expDays);
    var c_value = escape(value) + ((expDays == null) ? "" : "; expires=" + expDate.toUTCString());
    document.cookie = cookieName + "=" + c_value+"; path=/";
}

navigator.serviceWorker.register('/service-worker.js')
.then(function(registration) {
    if(registration.installing) {
        console.log('Service worker installing');
    } else if(registration.waiting) {
        console.log('Waiting to respond the Service worker');
    } else if(registration.active) {
        console.log('Service worker active');
    }
    return registration.pushManager.getSubscription()
    .then(function(subscription) {
        //addShadow();
        if(browser =='ucbrowser'){
           // removeShadow();
        }
        return registration.pushManager.subscribe({ userVisibleOnly: true })
        .then(function(subscription) {
            console.log('subsciption : ',subscription);
            //removeShadow();
            endpoint = subscription.endpoint;
            if(endpoint.length >50){
                var jsn = subscription.toJSON();    
                setCookie('endpoint', endpoint, null);
                setCookie('browser', browser, null);
                setCookie('auth', jsn.keys.auth, null);
                setCookie('p256dh', jsn.keys.p256dh, null);
            }
            return store_subscription(subscription);
        })
        .catch(function(e) {
            if (Notification.permission === 'denied') {
                console.warn('The user has blocked notifications.');
            }else if(e.code == 0){
                console.log("user closed/ignored the subscription request");  
            }else{
                console.warn('Error during pushManager.subscribe()', e);
            } 
            //removeShadow();
            return e;
        })
    })
});