// From drive-sync.js:14-27
export function initGoogleAPIs() {
    const CLIENT_ID = localStorage.getItem('estudo_drive_client_id');
    if (!CLIENT_ID) return;

    // Load GAPI (Google API client)
    const scriptGapi = document.createElement('script');
    scriptGapi.src = 'https://apis.google.com/js/api.js';
    scriptGapi.onload = () => {
        gapi.load('client', () => {
            gapi.client.init({
                discoveryDocs: ['https://www.googleapis.com/discovery/v1/apis/drive/v3/rest']
            }).then(() => { gapiInited = true; });
        });
    };
    document.head.appendChild(scriptGapi);
}

// From drive-sync.js:157-171
if (driveData.lastSync && state.lastSync && 
    new Date(driveData.lastSync) > new Date(state.lastSync)) {
    // Drive has newer version
    showConfirm(
        'Found newer version in Drive. Overwrite local data?',
        () => {
            setState(driveData);
            saveStateToDB().then(() => {
                showToast('Data updated from Drive!', 'success');
            });
        }
    );
}

// From drive-sync.js:256-264
document.addEventListener('stateSaved', () => {
    if (gapi.client?.getToken() !== null && state.driveFileId) {
        // Debounce to prevent sync overload
        if (window.driveSyncTimeout) clearTimeout(window.driveSyncTimeout);
        window.driveSyncTimeout = setTimeout(() => {
            SyncQueue.add(() => syncWithDrive());
        }, 10000); // 10s debounce
    }
});

// From drive-sync.js:187-209
state.lastSync = new Date().toISOString();
const accessToken = gapi.client.getToken().access_token;
const metadata = { 
    name: 'estudo-organizado-data.json', 
    mimeType: 'application/json' 
};

const boundary = '-------314159265358979323846';
const multipartRequestBody =
    delimiter +
    'Content-Type: application/json; charset=UTF-8\r\n\r\n' +
    JSON.stringify(metadata) +
    delimiter +
    'Content-Type: application/json\r\n\r\n' +
    JSON.stringify(state) +
    close_delim;

await fetch(
    `https://www.googleapis.com/upload/drive/v3/files/${state.driveFileId}?uploadType=multipart`,
    {
        method: 'PATCH',
        headers: {
            'Authorization': 'Bearer ' + accessToken,
            'Content-Type': 'multipart/related; boundary=' + boundary
        },
        body: multipartRequestBody
    }
);

// From drive-sync.js:56-81
if (status === 'connected') {
    sub.textContent = state.lastSync 
        ? `Synced: ${new Date(state.lastSync).toLocaleString('pt-BR')}` 
        : 'Synchronized';
    btn.textContent = 'Sync Now';
} else if (status === 'syncing') {
    sub.textContent = 'Syncing...';
    btn.textContent = 'Please wait...';
} else {
    sub.textContent = 'Click to connect';
    btn.textContent = 'Connect';
}