feat: add REST API for flashcards (/api/v1/flashcards/*)

sqlite.go

@@ -166,6 +166,73 @@ func (s *sqliteStore) getLatestByPublicID(ctx context.Context, publicID int64) (
 	return &e, nil
 }
 
+func (s *sqliteStore) listAllPublicIDs(ctx context.Context) ([]int64, error) {
+	rows, err := s.db.QueryContext(ctx,
+		`SELECT f.public_id FROM flashcard f
+		 WHERE f.version = (SELECT MAX(f2.version) FROM flashcard f2 WHERE f2.public_id = f.public_id)
+		 AND f.delete_timestamp IS NULL
+		 AND f.public_id != 0
+		 ORDER BY f.public_id`,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("list ids: %w", err)
+	}
+	defer rows.Close()
+
+	var ids []int64
+	for rows.Next() {
+		var id int64
+		if err := rows.Scan(&id); err != nil {
+			return nil, fmt.Errorf("scan id: %w", err)
+		}
+		ids = append(ids, id)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("rows: %w", err)
+	}
+	return ids, nil
+}
+
+func (s *sqliteStore) getByPublicIDAndVersion(ctx context.Context, publicID int64, version int) (*entry, error) {
+	row := s.db.QueryRowContext(ctx,
+		`SELECT _id, public_id, version, note, repos, host, tags, "user", context, delete_timestamp, created
+		 FROM flashcard WHERE public_id = ? AND version = ?`, publicID, version,
+	)
+
+	var e entry
+	var reposJSON, tagsJSON sql.NullString
+	var host, user, context_, deleteTimestamp sql.NullString
+
+	err := row.Scan(&e.ID, &e.PublicID, &e.Version, &e.Note, &reposJSON, &host, &tagsJSON, &user, &context_, &deleteTimestamp, &e.Created)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("query: %w", err)
+	}
+
+	if reposJSON.Valid {
+		e.Repos = unmarshalStringSlice(reposJSON.String)
+	}
+	if tagsJSON.Valid {
+		e.Tags = unmarshalStringSlice(tagsJSON.String)
+	}
+	if host.Valid {
+		e.Host = host.String
+	}
+	if user.Valid {
+		e.User = user.String
+	}
+	if context_.Valid {
+		e.Context = context_.String
+	}
+	if deleteTimestamp.Valid {
+		e.DeleteTimestamp = deleteTimestamp.String
+	}
+
+	return &e, nil
+}
+
 func (s *sqliteStore) tombstone(ctx context.Context, publicID int64, version int) (int64, error) {
 	result, err := s.db.ExecContext(ctx,
 		`INSERT INTO flashcard (public_id, version, note, delete_timestamp)