from __future__ import annotations

from abc import ABC, abstractmethod
from collections.abc import Sequence

from PIL import Image

from src.schemas.detection import DetectionResult


class Detector(ABC):
    """Discovers and localizes radiographic findings (Stage 1)."""

    @abstractmethod
    def detect(
        self,
        images: Sequence[Image.Image],
        input_images: list[str],
        case_id: str | None = None,
    ) -> tuple[DetectionResult, list[Image.Image]]:
        """Return (DetectionResult, processed_images).

        processed_images are the padded versions of the input images used
        internally during detection; they are forwarded to Stage 2 and
        visualization so that coordinate spaces remain consistent.
        """