"""Run several detectors over a frame and merge their detections.

Used for the multi-model (ADetailer-style) setup: each ticked ``models/yolo/<cat>/*.pt``
becomes a :class:`~.yolo.YoloDetector` (tagged with its category), and this detector
concatenates all their results. Detections keep their own ``label`` (category), so the
overlay/table show every model's output together — no cross-model dedup (different
categories are meant to coexist).
"""

from __future__ import annotations

from ..video.frame import Frame
from .base import Detector
from .types import Detection


class MultiYoloDetector(Detector):
    def __init__(self, detectors: list[Detector]) -> None:
        if not detectors:
            raise ValueError("MultiYoloDetector requires at least one detector")
        self._detectors = detectors

    @property
    def name(self) -> str:
        return "Multi(" + " + ".join(d.name for d in self._detectors) + ")"

    def detect(self, frame: Frame) -> list[Detection]:
        out: list[Detection] = []
        for d in self._detectors:
            out.extend(d.detect(frame))
        return out