(function () {
    var hasAccess = false;

    function getAuthToken() {
        try {
            var creds = JSON.parse(localStorage.getItem('jellyfin_credentials'));
            var server = creds && creds.Servers && creds.Servers[0];
            return (server && server.AccessToken) || null;
        } catch (e) {
            return null;
        }
    }

    function checkAccess() {
        var token = getAuthToken();
        if (!token) {
            return Promise.resolve(false);
        }

        return fetch('/JellyLms/RemoteControl/Access', { headers: { 'X-Emby-Token': token } })
            .then(function (resp) { return resp.ok; })
            .catch(function () { return false; });
    }

    function addButton(headerRight) {
        if (headerRight.querySelector('.headerLmsRemoteButton')) {
            return;
        }

        var btn = document.createElement('button');
        btn.setAttribute('is', 'paper-icon-button-light');
        btn.setAttribute('type', 'button');
        btn.className = 'headerLmsRemoteButton headerButton headerButtonRight paper-icon-button-light';
        btn.title = 'Multi-room Remote';
        btn.innerHTML = '<span class="material-icons speaker_group" aria-hidden="true"></span>';
        btn.addEventListener('click', function () {
            window.location.href = '/JellyLms/RemoteControl';
        });

        var castButton = headerRight.querySelector('.headerCastButton');
        if (castButton) {
            headerRight.insertBefore(btn, castButton);
        } else {
            headerRight.appendChild(btn);
        }
    }

    function tryInject() {
        if (!hasAccess) {
            return;
        }

        var headerRight = document.querySelector('.headerRight');
        if (headerRight) {
            addButton(headerRight);
        }
    }

    function init() {
        checkAccess().then(function (ok) {
            hasAccess = ok;
            if (!ok) {
                return;
            }

            tryInject();

            var observer = new MutationObserver(tryInject);
            observer.observe(document.body, { childList: true, subtree: true });
        });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();