import queue

from metawatch import protocol

class Watch:
    def __init__(self, fd):
        self._fd = fd
        self._extra_packets = queue.Queue()

    def _read_packet(self, expected):
        while True:
            ib = protocol.InboundPacket(self._fd)
            p = ib.read()
            if isinstance(p, expected):
                return p
            self._extra_packets.put(p)
    
    def get_device_type(self):
        o = protocol.GetDeviceType()
        o.emit(self._fd)
        i = self._read_packet(protocol.GetDeviceTypeResponse)
        return i.device_type

    def get_rtc(self):
        o = protocol.GetRTC()
        o.emit(self._fd)
        i = self._read_packet(protocol.GetRTCResponse)
        return i.datetime