#!/usr/bin/env python3

from cmd import Cmd
from datetime import datetime, time
from inspect import getargspec
from shlex import shlex
from time import sleep


def drive_ir(pulses):
    # Debugging placeholder
    print(','.join([str(x) for x in pulses]))


class EufyRawIR:
    """ Low level IR signal modulation """

    _IR_PREAMBLE = (3000, 3000)
    _IR_0 = (400, 600)
    _IR_1 = (400, 1600)
    _IR_TRAILER = (400, 20000)

    def _modulate(self, message):
        signal = list(self._IR_PREAMBLE)
        for b in message:
            for i in range(8):
                if (b << i) & 0x80:
                    signal.extend(list(self._IR_1))
                else:
                    signal.extend(list(self._IR_0))
        signal.extend(list(self._IR_TRAILER))
        return 3*signal

    def sendRaw(self, message):
        drive_ir(self._modulate(message))


class EufyIR(EufyRawIR):
    """ High level Eufy commands """

    _HEADER = 0x68

    CLEAN_AUTO = 0x5d
    CLEAN_SPOT = 0x8c
    CLEAN_EDGE = 0x9c
    CLEAN_ROOM = 0xad
    STOP = 0x4f
    POWER_MAX = 0x1c
    POWER_BOOSTIQ = 0x1d
    POWER_STANDARD = 0x1e
    MOVE_FORWARD = 0x2f
    MOVE_BACKWARD = 0x7f
    MOVE_CCW = 0x3f
    MOVE_CW = 0x6f
    SET_TIME = 0xbf
    SET_SCHEDULE = 0xcf
    CANCEL_SCHEDULE = 0xdf
    RETURN_BASE = 0xef

    def __init__(self):
        self._schedule = 0xff

    def _message(self, code):
        now = datetime.now()
        msg = [self._HEADER, code, now.hour, now.minute, self._schedule]
        checksum = sum(msg) & 0xff
        msg.append(checksum)
        return msg

    def send(self, code):
        self.sendRaw(self._message(code))

    def cleanAuto(self):
        self.send(self.CLEAN_AUTO)

    def cleanSpot(self):
        self.send(self.CLEAN_SPOT)

    def cleanEdge(self):
        self.send(self.CLEAN_EDGE)

    def cleanRoom(self):
        self.send(self.CLEAN_ROOM)

    def start(self):
        self.cleanAuto()

    def stop(self):
        self.send(self.STOP)

    def powerMax(self):
        self.send(self.POWER_MAX)

    def powerBoostIQ(self):
        self.send(self.POWER_BOOSTIQ)

    def powerStandard(self):
        self.send(self.POWER_STANDARD)

    def moveForward(self):
        self.send(self.MOVE_FORWARD)

    def moveBackward(self):
        self.send(self.MOVE_BACKWARD)

    def moveCCW(self):
        self.send(self.MOVE_CCW)

    def moveLeft(self):
        self.moveCCW()

    def moveCW(self):
        self.send(self.MOVE_CW)

    def moveRight(self):
        self.moveCW()

    def setTime(self):
        self.send(self.SET_TIME)

    def setSchedule(self, t):
        # FIXME: properly store schedule
        self.send(self.SET_SCHEDULE, t)

    def cancelSchedule(self):
        # FIXME: properly store schedule
        self.send(self.CANCEL_SCHEDULE)

    def returnBase(self):
        self.send(self.RETURN_BASE)


def lexer(f):
    def g(self, args):
        argv = tuple(x.lower() for x in shlex(args))
        s = getargspec(f)
        maxargs = len(s.args or [])
        minargs = maxargs - len(s.defaults or [])
        if minargs <= len(argv) + 1 <= maxargs:
            return f(self, *argv)
        else:
            self.stdout.write("*** Invalid arguments for {}\n".format(f.__name__[3:]))
    return g


class Eufy(Cmd):

    prompt = 'eufy> '

    def __init__(self, *args, **kwargs):
        super(Eufy, self).__init__(*args, **kwargs)
        self.ir = EufyIR()

    @lexer
    def do_clean(self, mode='auto'):
        {
            'auto': self.ir.cleanAuto,
            'spot': self.ir.cleanSpot,
            'edge': self.ir.cleanEdge,
            'room': self.ir.cleanRoom
        }.get(mode)()

    @lexer
    def do_start(self):
        self.ir.cleanAuto()

    @lexer
    def do_stop(self):
        self.ir.stop()

    @lexer
    def do_power(self, mode):
        {
            'standard': self.ir.powerStandard,
            'boostiq': self.ir.powerBoostIQ,
            'max': self.ir.powerMax
        }.get(mode)()

    @lexer
    def do_move(self, direction):
        {
            'forward': self.ir.moveForward,
            'backward': self.ir.moveBackward,
            'ccw': self.ir.moveCCW,
            'cw': self.ir.moveCW,
            'left': self.ir.moveCCW,
            'right': self.ir.moveCW
        }.get(direction)()

    @lexer
    def do_time(self):
        self.ir.setTime()

    @lexer
    def do_schedule(self, t):
        newtime = datetime.now()
        newtime.strptime(t, "%H:%M")
        self.ir.setSchedule(newtime.time())

    @lexer
    def do_base(self):
        self.ir.returnBase()

    @lexer
    def do_pause(self, delay=1):
        sleep(int(delay))

    @lexer
    def do_quit(self):
        return True

    @lexer
    def do_EOF(self):
        return True


if __name__ == '__main__':
    from argparse import ArgumentParser, FileType

    parser = ArgumentParser(description='Eufy RoboVac 11s CLI tool')
    parser.add_argument('-f', '--file', type=FileType('r'), help='read commands from file')
    parser.add_argument('command', nargs='*')
    args = parser.parse_args()

    eufy = Eufy()

    if args.file:
        eufy.cmdqueue.extend(args.file.readlines())

    if args.command:
        eufy.cmdqueue.extend(' '.join(args.command).split(','))

    if eufy.cmdqueue:
        eufy.cmdqueue.append('quit')

    eufy.cmdloop()