#!/usr/bin/python

import codecs
import json
import random
import socket
import struct
import threading
import time
from datetime import datetime

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes

from .exceptions import check_error, exception

def gendevice(devtype, host, mac, name=None, cloud=None):
    devices = {
        sp1: [0],
        sp2: [0x2711,  # SP2
              0x2719, 0x7919, 0x271a, 0x791a,  # Honeywell SP2
              0x2720,  # SPMini
              0x753e,  # SP3
              0x7D00,  # OEM branded SP3
              0x947a, 0x9479,  # SP3S
              0x2728,  # SPMini2
              0x2733, 0x273e,  # OEM branded SPMini
              0x7530, 0x7546, 0x7918,  # OEM branded SPMini2
              0x7D0D,  # TMall OEM SPMini3
              0x2736  # SPMiniPlus
              ],
        rm: [0x2712,  # RM2
             0x2737,  # RM Mini
             0x273d,  # RM Pro Phicomm
             0x2783,  # RM2 Home Plus
             0x277c,  # RM2 Home Plus GDT
             0x272a,  # RM2 Pro Plus
             0x2787,  # RM2 Pro Plus2
             0x279d,  # RM2 Pro Plus3
             0x27a9,  # RM2 Pro Plus_300
             0x278b,  # RM2 Pro Plus BL
             0x2797,  # RM2 Pro Plus HYC
             0x27a1,  # RM2 Pro Plus R1
             0x27a6,  # RM2 Pro PP
             0x278f,  # RM Mini Shate
             0x27c2,  # RM Mini 3
             0x27d1,  # new RM Mini3
             0x27de  # RM Mini 3 (C)
             ],
        rm4: [0x51da,  # RM4 Mini
              0x5f36,  # RM Mini 3
              0x6026,  # RM4 Pro
              0x6070,  # RM4c Mini
              0x61a2,  # RM4 Pro
              0x610e,  # RM4 Mini
              0x610f,  # RM4c
              0x62bc,  # RM4 Mini
              0x62be  # RM4c Mini
              ],
        a1: [0x2714],  # A1
        mp1: [0x4EB5,  # MP1
              0x4EF7  # Honyar oem mp1
              ],
        hysen: [0x4EAD],  # Hysen controller
        S1C: [0x2722],  # S1 (SmartOne Alarm Kit)
        dooya: [0x4E4D],  # Dooya DT360E (DOOYA_CURTAIN_V2)
        bg1: [0x51E3], # BG Electrical Smart Power Socket
        lb1 : [0x60c8]   # RGB Smart Bulb
    }

    # Look for the class associated to devtype in devices
    [device_class] = [dev for dev in devices if devtype in devices[dev]] or [None]
    if device_class is None:
        return device(host, mac, devtype, name=name, cloud=cloud)
    return device_class(host, mac, devtype, name=name, cloud=cloud)


def discover(timeout=None, local_ip_address=None, discover_ip_address='255.255.255.255'):
    if local_ip_address is None:
        local_ip_address = socket.gethostbyname(socket.gethostname())
    if local_ip_address.startswith('127.'):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(('8.8.8.8', 53))  # connecting to a UDP address doesn't send packets
        local_ip_address = s.getsockname()[0]
    address = local_ip_address.split('.')
    cs = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    cs.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    cs.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    cs.bind((local_ip_address, 0))
    port = cs.getsockname()[1]
    starttime = time.time()

    devices = []

    timezone = int(time.timezone / -3600)
    packet = bytearray(0x30)

    year = datetime.now().year

    if timezone < 0:
        packet[0x08] = 0xff + timezone - 1
        packet[0x09] = 0xff
        packet[0x0a] = 0xff
        packet[0x0b] = 0xff
    else:
        packet[0x08] = timezone
        packet[0x09] = 0
        packet[0x0a] = 0
        packet[0x0b] = 0
    packet[0x0c] = year & 0xff
    packet[0x0d] = year >> 8
    packet[0x0e] = datetime.now().minute
    packet[0x0f] = datetime.now().hour
    subyear = str(year)[2:]
    packet[0x10] = int(subyear)
    packet[0x11] = datetime.now().isoweekday()
    packet[0x12] = datetime.now().day
    packet[0x13] = datetime.now().month
    packet[0x18] = int(address[0])
    packet[0x19] = int(address[1])
    packet[0x1a] = int(address[2])
    packet[0x1b] = int(address[3])
    packet[0x1c] = port & 0xff
    packet[0x1d] = port >> 8
    packet[0x26] = 6
    
    checksum = 0xbeaf
    for b in packet:
        checksum = (checksum + b) & 0xffff

    packet[0x20] = checksum & 0xff
    packet[0x21] = checksum >> 8

    cs.sendto(packet, (discover_ip_address, 80))
    if timeout is None:
        response = cs.recvfrom(1024)
        responsepacket = bytearray(response[0])
        host = response[1]
        devtype = responsepacket[0x34] | responsepacket[0x35] << 8
        mac = responsepacket[0x3a:0x40]
        name = responsepacket[0x40:].split(b'\x00')[0].decode('utf-8')
        cloud = bool(responsepacket[-1])
        device = gendevice(devtype, host, mac, name=name, cloud=cloud)
        cs.close()
        return device

    while (time.time() - starttime) < timeout:
        cs.settimeout(timeout - (time.time() - starttime))
        try:
            response = cs.recvfrom(1024)
        except socket.timeout:
            cs.close()
            return devices
        responsepacket = bytearray(response[0])
        host = response[1]
        devtype = responsepacket[0x34] | responsepacket[0x35] << 8
        mac = responsepacket[0x3a:0x40]
        name = responsepacket[0x40:].split(b'\x00')[0].decode('utf-8')
        cloud = bool(responsepacket[-1])
        device = gendevice(devtype, host, mac, name=name, cloud=cloud)
        devices.append(device)
    cs.close()
    return devices


class device:
    def __init__(self, host, mac, devtype, timeout=10, name=None, cloud=None):
        self.host = host
        self.mac = mac.encode() if isinstance(mac, str) else mac
        self.devtype = devtype if devtype is not None else 0x272a
        self.name = name
        self.cloud = cloud
        self.timeout = timeout
        self.count = random.randrange(0xffff)
        self.iv = bytearray(
            [0x56, 0x2e, 0x17, 0x99, 0x6d, 0x09, 0x3d, 0x28, 0xdd, 0xb3, 0xba, 0x69, 0x5a, 0x2e, 0x6f, 0x58])
        self.id = bytearray([0, 0, 0, 0])
        self.type = "Unknown"
        self.lock = threading.Lock()

        self.aes = None
        key = bytearray(
            [0x09, 0x76, 0x28, 0x34, 0x3f, 0xe9, 0x9e, 0x23, 0x76, 0x5c, 0x15, 0x13, 0xac, 0xcf, 0x8b, 0x02])
        self.update_aes(key)

    def update_aes(self, key):
        self.aes = Cipher(algorithms.AES(key), modes.CBC(self.iv),
                          backend=default_backend())

    def encrypt(self, payload):
        encryptor = self.aes.encryptor()
        return encryptor.update(payload) + encryptor.finalize()

    def decrypt(self, payload):
        decryptor = self.aes.decryptor()
        return decryptor.update(payload) + decryptor.finalize()

    def auth(self):
        payload = bytearray(0x50)
        payload[0x04] = 0x31
        payload[0x05] = 0x31
        payload[0x06] = 0x31
        payload[0x07] = 0x31
        payload[0x08] = 0x31
        payload[0x09] = 0x31
        payload[0x0a] = 0x31
        payload[0x0b] = 0x31
        payload[0x0c] = 0x31
        payload[0x0d] = 0x31
        payload[0x0e] = 0x31
        payload[0x0f] = 0x31
        payload[0x10] = 0x31
        payload[0x11] = 0x31
        payload[0x12] = 0x31
        payload[0x1e] = 0x01
        payload[0x2d] = 0x01
        payload[0x30] = ord('T')
        payload[0x31] = ord('e')
        payload[0x32] = ord('s')
        payload[0x33] = ord('t')
        payload[0x34] = ord(' ')
        payload[0x35] = ord(' ')
        payload[0x36] = ord('1')

        response = self.send_packet(0x65, payload)
        check_error(response[0x22:0x24])
        payload = self.decrypt(response[0x38:])

        key = payload[0x04:0x14]
        if len(key) % 16 != 0:
            return False

        self.id = payload[0x00:0x04]
        self.update_aes(key)

        return True

    def get_type(self):
        return self.type

    def send_packet(self, command, payload):
        self.count = (self.count + 1) & 0xffff
        packet = bytearray(0x38)
        packet[0x00] = 0x5a
        packet[0x01] = 0xa5
        packet[0x02] = 0xaa
        packet[0x03] = 0x55
        packet[0x04] = 0x5a
        packet[0x05] = 0xa5
        packet[0x06] = 0xaa
        packet[0x07] = 0x55
        packet[0x24] = self.devtype & 0xff
        packet[0x25] = self.devtype >> 8
        packet[0x26] = command
        packet[0x28] = self.count & 0xff
        packet[0x29] = self.count >> 8
        packet[0x2a] = self.mac[0]
        packet[0x2b] = self.mac[1]
        packet[0x2c] = self.mac[2]
        packet[0x2d] = self.mac[3]
        packet[0x2e] = self.mac[4]
        packet[0x2f] = self.mac[5]
        packet[0x30] = self.id[0]
        packet[0x31] = self.id[1]
        packet[0x32] = self.id[2]
        packet[0x33] = self.id[3]

        # pad the payload for AES encryption
        if payload:
            payload += bytearray((16 - len(payload)) % 16)

        checksum = 0xbeaf
        for b in payload:
            checksum = (checksum + b) & 0xffff

        packet[0x34] = checksum & 0xff
        packet[0x35] = checksum >> 8

        payload = self.encrypt(payload)
        for i in range(len(payload)):
            packet.append(payload[i])

        checksum = 0xbeaf
        for b in packet:
            checksum = (checksum + b) & 0xffff

        packet[0x20] = checksum & 0xff
        packet[0x21] = checksum >> 8

        start_time = time.time()
        with self.lock:
            cs = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            cs.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

            while True:
                try:
                    cs.sendto(packet, self.host)
                    cs.settimeout(1)
                    response = cs.recvfrom(2048)
                    break
                except socket.timeout:
                    if (time.time() - start_time) > self.timeout:
                        cs.close()
                        raise exception(0xfffd)
            cs.close()
        return bytearray(response[0])


class mp1(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "MP1"

    def set_power_mask(self, sid_mask, state):
        """Sets the power state of the smart power strip."""

        packet = bytearray(16)
        packet[0x00] = 0x0d
        packet[0x02] = 0xa5
        packet[0x03] = 0xa5
        packet[0x04] = 0x5a
        packet[0x05] = 0x5a
        packet[0x06] = 0xb2 + ((sid_mask << 1) if state else sid_mask)
        packet[0x07] = 0xc0
        packet[0x08] = 0x02
        packet[0x0a] = 0x03
        packet[0x0d] = sid_mask
        packet[0x0e] = sid_mask if state else 0

        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def set_power(self, sid, state):
        """Sets the power state of the smart power strip."""
        sid_mask = 0x01 << (sid - 1)
        return self.set_power_mask(sid_mask, state)

    def check_power_raw(self):
        """Returns the power state of the smart power strip in raw format."""
        packet = bytearray(16)
        packet[0x00] = 0x0a
        packet[0x02] = 0xa5
        packet[0x03] = 0xa5
        packet[0x04] = 0x5a
        packet[0x05] = 0x5a
        packet[0x06] = 0xae
        packet[0x07] = 0xc0
        packet[0x08] = 0x01

        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x4], int):
            state = payload[0x0e]
        else:
            state = ord(payload[0x0e])
        return state

    def check_power(self):
        """Returns the power state of the smart power strip."""
        state = self.check_power_raw()
        if state is None:
            return {'s1': None, 's2': None, 's3': None, 's4': None}
        data = {}
        data['s1'] = bool(state & 0x01)
        data['s2'] = bool(state & 0x02)
        data['s3'] = bool(state & 0x04)
        data['s4'] = bool(state & 0x08)
        return data


class bg1(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "BG1"

    def get_state(self):
        """Get state of device.
        
        Returns:
            dict: Dictionary of current state
            eg. `{"pwr":1,"pwr1":1,"pwr2":0,"maxworktime":60,"maxworktime1":60,"maxworktime2":0,"idcbrightness":50}`"""
        packet = self._encode(1, b'{}')
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        return self._decode(response)

    def set_state(self, pwr=None, pwr1=None, pwr2=None, maxworktime=None, maxworktime1=None, maxworktime2=None, idcbrightness=None):
        data = {}
        if pwr is not None:
            data['pwr'] = int(bool(pwr))
        if pwr1 is not None:
            data['pwr1'] = int(bool(pwr1))
        if pwr2 is not None:
            data['pwr2'] = int(bool(pwr2))
        if maxworktime is not None:
            data['maxworktime'] = maxworktime
        if maxworktime1 is not None:
            data['maxworktime1'] = maxworktime1
        if maxworktime2 is not None:
            data['maxworktime2'] = maxworktime2
        if idcbrightness is not None:
            data['idcbrightness'] = idcbrightness
        js = json.dumps(data).encode('utf8')
        packet = self._encode(2, js)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        return self._decode(response)

    def _encode(self, flag, js):
        # packet format is:
        # 0x00-0x01 length
        # 0x02-0x05 header
        # 0x06-0x07 00
        # 0x08 flag (1 for read or 2 write?)
        # 0x09 unknown (0xb)
        # 0x0a-0x0d length of json
        # 0x0e- json data
        packet = bytearray(14)
        length = 4 + 2 + 2 + 4 + len(js)
        struct.pack_into('<HHHHBBI', packet, 0, length, 0xa5a5, 0x5a5a, 0x0000, flag, 0x0b, len(js))
        for i in range(len(js)):
            packet.append(js[i])

        checksum = 0xc0ad
        for b in packet[0x08:]:
            checksum = (checksum + b) & 0xffff

        packet[0x06] = checksum & 0xff
        packet[0x07] = checksum >> 8

        return packet

    def _decode(self, response):
        payload = self.decrypt(bytes(response[0x38:]))
        js_len = struct.unpack_from('<I', payload, 0x0a)[0]
        state = json.loads(payload[0x0e:0x0e+js_len])
        return state

class sp1(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "SP1"

    def set_power(self, state):
        packet = bytearray(4)
        packet[0] = state
        response = self.send_packet(0x66, packet)
        check_error(response[0x22:0x24])


class sp2(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "SP2"

    def set_power(self, state):
        """Sets the power state of the smart plug."""
        packet = bytearray(16)
        packet[0] = 2
        if self.check_nightlight():
            packet[4] = 3 if state else 2
        else:
            packet[4] = 1 if state else 0
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def set_nightlight(self, state):
        """Sets the night light state of the smart plug"""
        packet = bytearray(16)
        packet[0] = 2
        if self.check_power():
            packet[4] = 3 if state else 1
        else:
            packet[4] = 2 if state else 0
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def check_power(self):
        """Returns the power state of the smart plug."""
        packet = bytearray(16)
        packet[0] = 1
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x4], int):
            return bool(payload[0x4] == 1 or payload[0x4] == 3 or payload[0x4] == 0xFD)
        return bool(ord(payload[0x4]) == 1 or ord(payload[0x4]) == 3 or ord(payload[0x4]) == 0xFD)

    def check_nightlight(self):
        """Returns the power state of the smart plug."""
        packet = bytearray(16)
        packet[0] = 1
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x4], int):
            return bool(payload[0x4] == 2 or payload[0x4] == 3 or payload[0x4] == 0xFF)
        return bool(ord(payload[0x4]) == 2 or ord(payload[0x4]) == 3 or ord(payload[0x4]) == 0xFF)

    def get_energy(self):
        packet = bytearray([8, 0, 254, 1, 5, 1, 0, 0, 0, 45])
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x7], int):
            energy = int(hex(payload[0x07] * 256 + payload[0x06])[2:]) + int(hex(payload[0x05])[2:]) / 100.0
        else:
            energy = int(hex(ord(payload[0x07]) * 256 + ord(payload[0x06]))[2:]) + int(
                hex(ord(payload[0x05]))[2:]) / 100.0
        return energy


class a1(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "A1"

    def check_sensors(self):
        packet = bytearray(16)
        packet[0] = 1
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        data = {}
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x4], int):
            data['temperature'] = (payload[0x4] * 10 + payload[0x5]) / 10.0
            data['humidity'] = (payload[0x6] * 10 + payload[0x7]) / 10.0
            light = payload[0x8]
            air_quality = payload[0x0a]
            noise = payload[0xc]
        else:
            data['temperature'] = (ord(payload[0x4]) * 10 + ord(payload[0x5])) / 10.0
            data['humidity'] = (ord(payload[0x6]) * 10 + ord(payload[0x7])) / 10.0
            light = ord(payload[0x8])
            air_quality = ord(payload[0x0a])
            noise = ord(payload[0xc])
        if light == 0:
            data['light'] = 'dark'
        elif light == 1:
            data['light'] = 'dim'
        elif light == 2:
            data['light'] = 'normal'
        elif light == 3:
            data['light'] = 'bright'
        else:
            data['light'] = 'unknown'
        if air_quality == 0:
            data['air_quality'] = 'excellent'
        elif air_quality == 1:
            data['air_quality'] = 'good'
        elif air_quality == 2:
            data['air_quality'] = 'normal'
        elif air_quality == 3:
            data['air_quality'] = 'bad'
        else:
            data['air_quality'] = 'unknown'
        if noise == 0:
            data['noise'] = 'quiet'
        elif noise == 1:
            data['noise'] = 'normal'
        elif noise == 2:
            data['noise'] = 'noisy'
        else:
            data['noise'] = 'unknown'
        return data

    def check_sensors_raw(self):
        packet = bytearray(16)
        packet[0] = 1
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        data = {}
        payload = self.decrypt(bytes(response[0x38:]))
        if isinstance(payload[0x4], int):
            data['temperature'] = (payload[0x4] * 10 + payload[0x5]) / 10.0
            data['humidity'] = (payload[0x6] * 10 + payload[0x7]) / 10.0
            data['light'] = payload[0x8]
            data['air_quality'] = payload[0x0a]
            data['noise'] = payload[0xc]
        else:
            data['temperature'] = (ord(payload[0x4]) * 10 + ord(payload[0x5])) / 10.0
            data['humidity'] = (ord(payload[0x6]) * 10 + ord(payload[0x7])) / 10.0
            data['light'] = ord(payload[0x8])
            data['air_quality'] = ord(payload[0x0a])
            data['noise'] = ord(payload[0xc])
        return data


class rm(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "RM2"
        self._request_header = bytes()
        self._code_sending_header = bytes()

    def check_data(self):
        packet = bytearray(self._request_header)
        packet.append(0x04)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        return payload[len(self._request_header) + 4:]

    def send_data(self, data):
        packet = bytearray(self._code_sending_header)
        packet += bytes([0x02, 0x00, 0x00, 0x00])
        packet += data
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def enter_learning(self):
        packet = bytearray(self._request_header)
        packet.append(0x03)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def sweep_frequency(self):
        packet = bytearray(self._request_header)
        packet.append(0x19)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def cancel_sweep_frequency(self):
        packet = bytearray(self._request_header)
        packet.append(0x1e)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])

    def check_frequency(self):
        packet = bytearray(self._request_header)
        packet.append(0x1a)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if payload[len(self._request_header) + 4] == 1:
            return True
        return False

    def find_rf_packet(self):
        packet = bytearray(self._request_header)
        packet.append(0x1b)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if payload[len(self._request_header) + 4] == 1:
            return True
        return False

    def _read_sensor(self, type, offset, divider):
        packet = bytearray(self._request_header)
        packet.append(type)
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        value_pos = len(self._request_header) + offset
        if isinstance(payload[value_pos], int):
            value = (payload[value_pos] + payload[value_pos+1] / divider)
        else:
            value = (ord(payload[value_pos]) + ord(payload[value_pos+1]) / divider)
        return value

    def check_temperature(self):
        return self._read_sensor( 0x01, 4, 10.0 )

class rm4(rm):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "RM4"
        self._request_header = b'\x04\x00'
        self._code_sending_header = b'\xd0\x00'

    def check_temperature(self):
        return self._read_sensor( 0x24, 4, 100.0 )

    def check_humidity(self):
        return self._read_sensor( 0x24, 6, 100.0 )

    def check_sensors(self):
        return {
            'temperature': self.check_temperature(),
            'humidity': self.check_humidity()
        }

# For legacy compatibility - don't use this
class rm2(rm):
    def __init__(self):
        device.__init__(self, None, None, None)

    def discover(self):
        dev = discover()
        self.host = dev.host
        self.mac = dev.mac


class hysen(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "Hysen heating controller"

    # Send a request
    # input_payload should be a bytearray, usually 6 bytes, e.g. bytearray([0x01,0x06,0x00,0x02,0x10,0x00])
    # Returns decrypted payload
    # New behaviour: raises a ValueError if the device response indicates an error or CRC check fails
    # The function prepends length (2 bytes) and appends CRC

    def calculate_crc16(self, input_data):
        from ctypes import c_ushort
        crc16_tab = []
        crc16_constant = 0xA001

        for i in range(0, 256):
            crc = c_ushort(i).value
            for j in range(0, 8):
                if (crc & 0x0001):
                    crc = c_ushort(crc >> 1).value ^ crc16_constant
                else:
                    crc = c_ushort(crc >> 1).value
            crc16_tab.append(hex(crc))

        try:
            is_string = isinstance(input_data, str)
            is_bytes = isinstance(input_data, bytes)

            if not is_string and not is_bytes:
                raise Exception("Please provide a string or a byte sequence "
                                "as argument for calculation.")

            crcValue = 0xffff

            for c in input_data:
                d = ord(c) if is_string else c
                tmp = crcValue ^ d
                rotated = c_ushort(crcValue >> 8).value
                crcValue = rotated ^ int(crc16_tab[(tmp & 0x00ff)], 0)

            return crcValue
        except Exception as e:
            print("EXCEPTION(calculate): {}".format(e))

    def send_request(self, input_payload):

        crc = self.calculate_crc16(bytes(input_payload))

        # first byte is length, +2 for CRC16
        request_payload = bytearray([len(input_payload) + 2, 0x00])
        request_payload.extend(input_payload)

        # append CRC
        request_payload.append(crc & 0xFF)
        request_payload.append((crc >> 8) & 0xFF)

        # send to device
        response = self.send_packet(0x6a, request_payload)
        check_error(response[0x22:0x24])
        response_payload = bytearray(self.decrypt(bytes(response[0x38:])))

        # experimental check on CRC in response (first 2 bytes are len, and trailing bytes are crc)
        response_payload_len = response_payload[0]
        if response_payload_len + 2 > len(response_payload):
            raise ValueError('hysen_response_error', 'first byte of response is not length')
        crc = self.calculate_crc16(bytes(response_payload[2:response_payload_len]))
        if (response_payload[response_payload_len] == crc & 0xFF) and (
                response_payload[response_payload_len + 1] == (crc >> 8) & 0xFF):
            return response_payload[2:response_payload_len]
        raise ValueError('hysen_response_error', 'CRC check on response failed')

    # Get current room temperature in degrees celsius
    def get_temp(self):
        payload = self.send_request(bytearray([0x01, 0x03, 0x00, 0x00, 0x00, 0x08]))
        return payload[0x05] / 2.0

    # Get current external temperature in degrees celsius
    def get_external_temp(self):
        payload = self.send_request(bytearray([0x01, 0x03, 0x00, 0x00, 0x00, 0x08]))
        return payload[18] / 2.0

    # Get full status (including timer schedule)
    def get_full_status(self):
        payload = self.send_request(bytearray([0x01, 0x03, 0x00, 0x00, 0x00, 0x16]))
        data = {}
        data['remote_lock'] = payload[3] & 1
        data['power'] = payload[4] & 1
        data['active'] = (payload[4] >> 4) & 1
        data['temp_manual'] = (payload[4] >> 6) & 1
        data['room_temp'] = (payload[5] & 255) / 2.0
        data['thermostat_temp'] = (payload[6] & 255) / 2.0
        data['auto_mode'] = payload[7] & 15
        data['loop_mode'] = (payload[7] >> 4) & 15
        data['sensor'] = payload[8]
        data['osv'] = payload[9]
        data['dif'] = payload[10]
        data['svh'] = payload[11]
        data['svl'] = payload[12]
        data['room_temp_adj'] = ((payload[13] << 8) + payload[14]) / 2.0
        if data['room_temp_adj'] > 32767:
            data['room_temp_adj'] = 32767 - data['room_temp_adj']
        data['fre'] = payload[15]
        data['poweron'] = payload[16]
        data['unknown'] = payload[17]
        data['external_temp'] = (payload[18] & 255) / 2.0
        data['hour'] = payload[19]
        data['min'] = payload[20]
        data['sec'] = payload[21]
        data['dayofweek'] = payload[22]

        weekday = []
        for i in range(0, 6):
            weekday.append(
                {'start_hour': payload[2 * i + 23], 'start_minute': payload[2 * i + 24], 'temp': payload[i + 39] / 2.0})

        data['weekday'] = weekday
        weekend = []
        for i in range(6, 8):
            weekend.append(
                {'start_hour': payload[2 * i + 23], 'start_minute': payload[2 * i + 24], 'temp': payload[i + 39] / 2.0})

        data['weekend'] = weekend
        return data

    # Change controller mode
    # auto_mode = 1 for auto (scheduled/timed) mode, 0 for manual mode.
    # Manual mode will activate last used temperature.
    # In typical usage call set_temp to activate manual control and set temp.
    # loop_mode refers to index in [ "12345,67", "123456,7", "1234567" ]
    # E.g. loop_mode = 0 ("12345,67") means Saturday and Sunday follow the "weekend" schedule
    # loop_mode = 2 ("1234567") means every day (including Saturday and Sunday) follows the "weekday" schedule
    # The sensor command is currently experimental
    def set_mode(self, auto_mode, loop_mode, sensor=0):
        mode_byte = ((loop_mode + 1) << 4) + auto_mode
        self.send_request(bytearray([0x01, 0x06, 0x00, 0x02, mode_byte, sensor]))

    # Advanced settings
    # Sensor mode (SEN) sensor = 0 for internal sensor, 1 for external sensor,
    # 2 for internal control temperature, external limit temperature. Factory default: 0.
    # Set temperature range for external sensor (OSV) osv = 5..99. Factory default: 42C
    # Deadzone for floor temprature (dIF) dif = 1..9. Factory default: 2C
    # Upper temperature limit for internal sensor (SVH) svh = 5..99. Factory default: 35C
    # Lower temperature limit for internal sensor (SVL) svl = 5..99. Factory default: 5C
    # Actual temperature calibration (AdJ) adj = -0.5. Prescision 0.1C
    # Anti-freezing function (FrE) fre = 0 for anti-freezing function shut down,
    #  1 for anti-freezing function open. Factory default: 0
    # Power on memory (POn) poweron = 0 for power on memory off, 1 for power on memory on. Factory default: 0
    def set_advanced(self, loop_mode, sensor, osv, dif, svh, svl, adj, fre, poweron):
        input_payload = bytearray([0x01, 0x10, 0x00, 0x02, 0x00, 0x05, 0x0a, loop_mode, sensor, osv, dif, svh, svl,
                                   (int(adj * 2) >> 8 & 0xff), (int(adj * 2) & 0xff), fre, poweron])
        self.send_request(input_payload)

    # For backwards compatibility only.  Prefer calling set_mode directly.
    # Note this function invokes loop_mode=0 and sensor=0.
    def switch_to_auto(self):
        self.set_mode(auto_mode=1, loop_mode=0)

    def switch_to_manual(self):
        self.set_mode(auto_mode=0, loop_mode=0)

    # Set temperature for manual mode (also activates manual mode if currently in automatic)
    def set_temp(self, temp):
        self.send_request(bytearray([0x01, 0x06, 0x00, 0x01, 0x00, int(temp * 2)]))

    # Set device on(1) or off(0), does not deactivate Wifi connectivity.
    # Remote lock disables control by buttons on thermostat.
    def set_power(self, power=1, remote_lock=0):
        self.send_request(bytearray([0x01, 0x06, 0x00, 0x00, remote_lock, power]))

    # set time on device
    # n.b. day=1 is Monday, ..., day=7 is Sunday
    def set_time(self, hour, minute, second, day):
        self.send_request(bytearray([0x01, 0x10, 0x00, 0x08, 0x00, 0x02, 0x04, hour, minute, second, day]))

    # Set timer schedule
    # Format is the same as you get from get_full_status.
    # weekday is a list (ordered) of 6 dicts like:
    # {'start_hour':17, 'start_minute':30, 'temp': 22 }
    # Each one specifies the thermostat temp that will become effective at start_hour:start_minute
    # weekend is similar but only has 2 (e.g. switch on in morning and off in afternoon)
    def set_schedule(self, weekday, weekend):
        # Begin with some magic values ...
        input_payload = bytearray([0x01, 0x10, 0x00, 0x0a, 0x00, 0x0c, 0x18])

        # Now simply append times/temps
        # weekday times
        for i in range(0, 6):
            input_payload.append(weekday[i]['start_hour'])
            input_payload.append(weekday[i]['start_minute'])

        # weekend times
        for i in range(0, 2):
            input_payload.append(weekend[i]['start_hour'])
            input_payload.append(weekend[i]['start_minute'])

        # weekday temperatures
        for i in range(0, 6):
            input_payload.append(int(weekday[i]['temp'] * 2))

        # weekend temperatures
        for i in range(0, 2):
            input_payload.append(int(weekend[i]['temp'] * 2))

        self.send_request(input_payload)


S1C_SENSORS_TYPES = {
    0x31: 'Door Sensor',  # 49 as hex
    0x91: 'Key Fob',  # 145 as hex, as serial on fob corpse
    0x21: 'Motion Sensor'  # 33 as hex
}


class S1C(device):
    """
    Its VERY VERY VERY DIRTY IMPLEMENTATION of S1C
    """

    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = 'S1C'

    def get_sensors_status(self):
        packet = bytearray(16)
        packet[0] = 0x06  # 0x06 - get sensors info, 0x07 - probably add sensors
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        if not payload:
            return None
        count = payload[0x4]
        sensors = payload[0x6:]
        sensors_a = [bytearray(sensors[i * 83:(i + 1) * 83]) for i in range(len(sensors) // 83)]

        sens_res = []
        for sens in sensors_a:
            status = ord(chr(sens[0]))
            _name = str(bytes(sens[4:26]).decode())
            _order = ord(chr(sens[1]))
            _type = ord(chr(sens[3]))
            _serial = bytes(codecs.encode(sens[26:30], "hex")).decode()

            type_str = S1C_SENSORS_TYPES.get(_type, 'Unknown')

            r = {
                'status': status,
                'name': _name.strip('\x00'),
                'type': type_str,
                'order': _order,
                'serial': _serial,
            }
            if r['serial'] != '00000000':
                sens_res.append(r)
        result = {
            'count': count,
            'sensors': sens_res
        }
        return result


class dooya(device):
    def __init__(self, *args, **kwargs):
        device.__init__(self, *args, **kwargs)
        self.type = "Dooya DT360E"

    def _send(self, magic1, magic2):
        packet = bytearray(16)
        packet[0] = 0x09
        packet[2] = 0xbb
        packet[3] = magic1
        packet[4] = magic2
        packet[9] = 0xfa
        packet[10] = 0x44
        response = self.send_packet(0x6a, packet)
        check_error(response[0x22:0x24])
        payload = self.decrypt(bytes(response[0x38:]))
        return ord(payload[4])

    def open(self):
        return self._send(0x01, 0x00)

    def close(self):
        return self._send(0x02, 0x00)

    def stop(self):
        return self._send(0x03, 0x00)

    def get_percentage(self):
        return self._send(0x06, 0x5d)

    def set_percentage_and_wait(self, new_percentage):
        current = self.get_percentage()
        if current > new_percentage:
            self.close()
            while current is not None and current > new_percentage:
                time.sleep(0.2)
                current = self.get_percentage()

        elif current < new_percentage:
            self.open()
            while current is not None and current < new_percentage:
                time.sleep(0.2)
                current = self.get_percentage()
        self.stop()

class lb1(device):
    state_dict = []
    effect_map_dict = { 'lovely color' : 0,
                        'flashlight' : 1,
                        'lightning' : 2,
                        'color fading' : 3,
                        'color breathing' : 4,
                        'multicolor breathing' : 5,
                        'color jumping' : 6,
                        'multicolor jumping' : 7 }

    def __init__(self, host, mac, devtype):
        device.__init__(self, host, mac, devtype)
        self.type = "SmartBulb"

    def send_command(self,command, type = 'set'):
        packet = bytearray(16+(int(len(command)/16) + 1)*16)
        packet[0x02] = 0xa5
        packet[0x03] = 0xa5
        packet[0x04] = 0x5a
        packet[0x05] = 0x5a
        packet[0x08] = 0x02 if type == "set" else 0x01 # 0x01 => query, # 0x02 => set
        packet[0x09] = 0x0b
        packet[0x0a] = len(command)
        packet[0x0e:] = map(ord, command)

        checksum = 0xbeaf
        for b in packet:
            checksum = (checksum + b) & 0xffff

        packet[0x00] = (0x0c + len(command)) & 0xff
        packet[0x06] = checksum & 0xff  # Checksum 1 position
        packet[0x07] = checksum >> 8  # Checksum 2 position

        response = self.send_packet(0x6a, packet)
        check_error(response[0x36:0x38])
        payload = self.decrypt(bytes(response[0x38:]))

        responseLength = int(payload[0x0a]) | (int(payload[0x0b]) << 8)
        if responseLength > 0:
            self.state_dict = json.loads(payload[0x0e:0x0e+responseLength])

    def set_json(self, jsonstr):
        reconvert = json.loads(jsonstr)
        if 'bulb_sceneidx' in reconvert.keys():
            reconvert['bulb_sceneidx'] = self.effect_map_dict.get(reconvert['bulb_sceneidx'], 255)

        self.send_command(json.dumps(reconvert))
        return json.dumps(self.state_dict)

    def set_state(self, state):
        cmd = '{"pwr":%d}' % (1 if state == "ON" or state == 1 else 0)
        self.send_command(cmd)

    def get_state(self):
        cmd = "{}"
        self.send_command(cmd)
        return self.state_dict

# Setup a new Broadlink device via AP Mode. Review the README to see how to enter AP Mode.
# Only tested with Broadlink RM3 Mini (Blackbean)
def setup(ssid, password, security_mode):
    # Security mode options are (0 - none, 1 = WEP, 2 = WPA1, 3 = WPA2, 4 = WPA1/2)
    payload = bytearray(0x88)
    payload[0x26] = 0x14  # This seems to always be set to 14
    # Add the SSID to the payload
    ssid_start = 68
    ssid_length = 0
    for letter in ssid:
        payload[(ssid_start + ssid_length)] = ord(letter)
        ssid_length += 1
    # Add the WiFi password to the payload
    pass_start = 100
    pass_length = 0
    for letter in password:
        payload[(pass_start + pass_length)] = ord(letter)
        pass_length += 1

    payload[0x84] = ssid_length  # Character length of SSID
    payload[0x85] = pass_length  # Character length of password
    payload[0x86] = security_mode  # Type of encryption (00 - none, 01 = WEP, 02 = WPA1, 03 = WPA2, 04 = WPA1/2)

    checksum = 0xbeaf
    for b in payload:
        checksum = (checksum + b) & 0xffff

    payload[0x20] = checksum & 0xff  # Checksum 1 position
    payload[0x21] = checksum >> 8  # Checksum 2 position

    sock = socket.socket(socket.AF_INET,  # Internet
                         socket.SOCK_DGRAM)  # UDP
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    sock.sendto(payload, ('255.255.255.255', 80))
    sock.close()