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from mesh.access import Model, Opcode
import struct


class SimpleOnOffClient(Model):
    SIMPLE_ON_OFF_STATUS = Opcode(0xc4, 0x59, "Simple OnOff Status")
    SIMPLE_ON_OFF_SET = Opcode(0xc1, 0x59, "Simple OnOff Set")
    SIMPLE_ON_OFF_GET = Opcode(0xc2, 0x59, "Simple OnOff Get")
    SIMPLE_ON_OFF_SET_UNACKNOWLEDGED = Opcode(0xc3, 0x59, "Simple OnOff Set Unacknowledged")

    def __init__(self):
        self.opcodes = [
            (self.SIMPLE_ON_OFF_STATUS, self.__simple_on_off_status_handler)]
        self.__tid = 0
        super(SimpleOnOffClient, self).__init__(self.opcodes)

    def set(self, state):
        message = bytearray()
        message += struct.pack("<BB", int(state), self._tid)
        self.send(self.SIMPLE_ON_OFF_SET, message)

    def get(self):
        self.send(self.SIMPLE_ON_OFF_GET)

    def unacknowledged_set(self, state):
        message = bytearray()
        message += struct.pack("<BB", int(state), self._tid)
        self.send(self.SIMPLE_ON_OFF_SET_UNACKNOWLEDGED, message)

    @property
    def _tid(self):
        tid = self.__tid
        self.__tid += 1
        if self.__tid >= 255:
            self.__tid = 0
        return tid

    def __simple_on_off_status_handler(self, opcode, message):
        on_off = "on" if message.data[0] > 0 else "off"
        self.logger.info("Present value is %s", on_off)
