sw.js

self.addEventListener('install', (event) => {
    event.waitUntil(self.skipWaiting());
});

self.addEventListener('activate', (event) => {
    event.waitUntil(self.clients.claim());
});

self.addEventListener('sync', (event) => {
    if (event.tag === 'sync-attendance') {
        event.waitUntil(syncRecords());
    }
});

async function syncRecords() {
    const backendUrl = 'https://atomicintel.vercel.app/'; // Replace with deployed URL
    try {
        const dbRequest = indexedDB.open("AttendanceDB", 1);
        dbRequest.onsuccess = async () => {
            const db = dbRequest.result;
            const records = await getAllRecords(db);
            if (records.length === 0) return;

            try {
                const response = await fetch(`${backendUrl}/sync`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify(records)
                });
                if (response.ok) {
                    records.forEach((rec, index) => deleteRecord(db, index + 1));
                    console.log('Synced successfully');
                } else {
                    console.error('Sync failed:', response.status);
                }
            } catch (e) {
                console.error('Sync error:', e);
            }
        };
        dbRequest.onerror = () => console.error('DB open error');
    } catch (e) {
        console.error('SyncRecords error:', e);
    }
}

function getAllRecords(db) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction("records", "readonly");
        const request = tx.objectStore("records").getAll();
        request.onsuccess = () => resolve(request.result);
        request.onerror = () => reject(request.error);
    });
}

function deleteRecord(db, key) {
    const tx = db.transaction("records", "readwrite");
    tx.objectStore("records").delete(key);
    tx.oncomplete = () => console.log(`Record ${key} deleted`);
    tx.onerror = () => console.error(`Failed to delete record ${key}`);
}