class OpenCVControlSource(BaseControlSource):
    def __init__(self, cap: cv2.VideoCapture, parent=None):
        super().__init__(parent)
        self.cap = cap

    def set_parameter(self, name, value):
        prop_id = getattr(cv2, name, None)
        if prop_id is None:
            self.errorOccurred.emit(f"Nieznany parametr {name}")
            return
        self.cap.set(prop_id, value)
        self.parameterChanged.emit(name, value)

    def get_parameter(self, name):
        prop_id = getattr(cv2, name, None)
        if prop_id is None:
            self.errorOccurred.emit(f"Nieznany parametr {name}")
            return None
        return self.cap.get(prop_id)

    def list_parameters(self):
        return {
            "CAP_PROP_BRIGHTNESS": self.cap.get(cv2.CAP_PROP_BRIGHTNESS),
            "CAP_PROP_CONTRAST": self.cap.get(cv2.CAP_PROP_CONTRAST),
            "CAP_PROP_SATURATION": self.cap.get(cv2.CAP_PROP_SATURATION),
            "CAP_PROP_GAIN": self.cap.get(cv2.CAP_PROP_GAIN),
            "CAP_PROP_EXPOSURE": self.cap.get(cv2.CAP_PROP_EXPOSURE),
        }