from typing import NamedTuple, Optional, Sequence

import numpy as np


class DetectionResult(NamedTuple):
    boxes: np.ndarray
    scores: Sequence[float]
    labels: Sequence[int]
    label_names: Optional[Sequence[str]] = None


class ObjectDetector:
    """Detector interface to keep inference agnostic to model details."""

    name: str

    def predict(self, frame: np.ndarray, queries: Sequence[str]) -> DetectionResult:
        raise NotImplementedError