import db from './configureFirestore';

const batchSize = 100;
export default function deleteCollection(collectionName: string): Promise<'DONE'|void> {
  return db.collection(collectionName).limit(batchSize).get().then((documents) => {
    const deletionPromises = [];
    documents.forEach((doc) => {
      deletionPromises.push(doc.ref.delete());
    });
    if (deletionPromises.length > 0) {
      return Promise.all(deletionPromises).then(() => deleteCollection(collectionName)).catch(err => console.error(err));
    }
    return 'DONE';
  });
}