export const saveToDB = (key, value) => {
    return new Promise((resolve, reject) => {
        const request = indexedDB.open('LimeliteDB', 1);
        request.onupgradeneeded = e => {
            const db = e.target.result;
            if (!db.objectStoreNames.contains('analysisStore')) {
                db.createObjectStore('analysisStore');
            }
        };
        request.onsuccess = e => {
            const db = e.target.result;
            const tx = db.transaction('analysisStore', 'readwrite');
            const store = tx.objectStore('analysisStore');
            const req = value === null ? store.delete(key) : store.put(value, key);
            req.onsuccess = () => resolve();
            req.onerror = () => reject(req.error);
        };
        request.onerror = () => reject(request.error);
    });
};

export const loadFromDB = (key) => {
    return new Promise((resolve, reject) => {
        const request = indexedDB.open('LimeliteDB', 1);
        request.onupgradeneeded = e => {
            const db = e.target.result;
            if (!db.objectStoreNames.contains('analysisStore')) {
                db.createObjectStore('analysisStore');
            }
        };
        request.onsuccess = e => {
            const db = e.target.result;
            if (!db.objectStoreNames.contains('analysisStore')) return resolve(null);
            const tx = db.transaction('analysisStore', 'readonly');
            const store = tx.objectStore('analysisStore');
            const req = store.get(key);
            req.onsuccess = () => resolve(req.result);
            req.onerror = () => reject(req.error);
        };
        request.onerror = () => reject(request.error);
    });
};