if ('serviceWorker' in navigator) {
    window.addEventListener('load', function() {
        navigator.serviceWorker.register('/firebase-messaging-sw.js');
    });
}

var messaging;

if (firebase.messaging.isSupported()) {
    messaging = firebase.messaging();

    //在頁面停留 1分鐘 才執行
    setTimeout("requestPermission()", 60000);

    //收到訊息後的處理
    messaging.onMessage(function (payload) {
        //如果可以顯示通知就做顯示通知
        if (Notification.permission === 'granted') {
            var data = payload.data;
            var requireInteraction = false;
            if (data.requireInteraction == 'true') {
                var requireInteraction = true;
            }

            var notificationTitle = data.title;
            var notificationOptions = {
                body: data.body,
                icon: data.icon,
                requireInteraction: requireInteraction,
                event_action: data.event_action
            };

            var open_status = false;
            var notification = new Notification(notificationTitle, notificationOptions);
            notification.onclick = function(e) {
                e.preventDefault();
                window.open(data.click_action, '_blank');
                fetch(data.ga_click, {method: 'get'});
                if (data.event_action) {
                    console.log('FCM_click');
                    fetch(data.event_action + '&action=open', {method: 'get'});
                }
                open_status = true;
                notification.close();
            }

            notification.onclose = function(e) {
                if (open_status == false) {
                    e.preventDefault();
                    fetch(data.ga_close, {method: 'get'});
                    if (data.event_action) {
                        console.log('FCM_close');
                        fetch(data.event_action + '&action=close', {method: 'get'});
                    }
                }
            }

            fetch(data.ga_received, { method: 'get' });
            if (data.event_action) {
                console.log('FCM_received');
                fetch(data.event_action + '&action=received', {method: 'get'});
            }
        }
    });
}

function requestPermission() {
    Notification.requestPermission()
    .then(function(permission) {
        if (permission === 'granted') {
            FCM();
            tokenRefresh();
        }
    }).catch(function(err) {
    });
}

function FCM() {
    messaging.getToken().then(function(currentToken) {
        if (currentToken) {
            sendTokenToServer(currentToken);
        } else {
            setTokenSentToServer(false);
        }
    }).catch(function(err) {
        setTokenSentToServer(false);
    });
}

function tokenRefresh() {
    messaging.onTokenRefresh(function() {
        messaging.getToken().then(function(refreshedToken) {
            setTokenSentToServer(false);

            sendTokenToServer(refreshedToken);
        }).catch(function(err) {
        });
    });
}

function sendTokenToServer(currentToken) {
    if (!isTokenSentToServer(currentToken)) {
        var ajax_url = "ajax/firebase/fcm_fetchToken.php";
        $.ajax({
            url: ajax_url,
            data: {notify_token: currentToken, device_id: navigator.userAgent.toLowerCase()},
            type: 'POST',
            cache: false,
            dataType: 'json'
        });
        setTokenSentToServer(true);
    }
}

function isTokenSentToServer(currentToken) {
    //Insert cookie
    var d = new Date();
    d.setTime(d.getTime() + (7 * 24 * 60 * 60 * 1000));
    document.cookie = "regId=" + currentToken + ";expires=" + d.toUTCString() + ";samesite=Strict;";

    if (window.localStorage.getItem('sent_status') === '7') {
        return true;
    }

    return false;
}

function setTokenSentToServer(sent) {
    if (sent) {
        window.localStorage.setItem('sent_status', '7');
    } else {
        window.localStorage.removeItem('sent_status');

        //delete cookie
        var expires = new Date();
        expires.setTime(expires.getTime() - 1);
        document.cookie = "regId=;expires=" + expires.toUTCString() + ";samesite=Strict;";
    }
}