import msgpack

cdef class Detection:
    def __init__(self, double x, double y, double w, double h, int cls, double confidence):
        self.x = x
        self.y = y
        self.w = w
        self.h = h
        self.cls = cls
        self.confidence = confidence

    def __str__(self):
        return f'{self.cls}: {self.x:.2f} {self.y:.2f} {self.w:.2f} {self.h:.2f}, prob: {(self.confidence*100):.1f}%'

cdef class Annotation:
    def __init__(self, bytes image_bytes, long time, list[Detection] detections):
        self.image = image_bytes
        self.time = time
        self.detections = detections if detections is not None else []

    cdef bytes serialize(self):
        return msgpack.packb({
            "i": self.image,  # "i" = image
            "t": self.time,  # "t" = time
            "d": [  # "d" = detections
                {
                    "x": det.x,
                    "y": det.y,
                    "w": det.w,
                    "h": det.h,
                    "c": det.cls,
                    "p": det.confidence
                } for det in self.detections
            ]
        })