import asyncio
from enum import Enum
import struct

from led_cmds import *

MAGIC_TOKEN_HOST_TO_FW = 0x1d6379e3
MAGIC_TOKEN_FW_TO_HOST = 0x10c65631


class MessageFwToHost(Enum):
    RFID_TOKEN_READ = 0
    BUTTON_NORMAL_PRESS = 1
    ROTARY_ENCODER = 2


class MessageHostToFw(Enum):
    LED_WHEEL_EFFECT_STATIC = 0
    LED_WHEEL_EFFECT_ALEXA_SWIPE = 1
    LED_WHEEL_EFFECT_CIRCULAR = 2
    LED_WHEEL_EFFECT_RANDOM_TWO_COLOR_INTERPOLATION = 3


outgoing_msg_map = {
    EffectStaticConfig: 0,
    EffectAlexaSwipeConfig: 1,
    EffectCircularConfig: 2,
    EffectRandomTwoColorInterpolationConfig: 3,
    EffectSwipeAndChange: 4,
}


class RfidTokenRead:
    def __init__(self, id: bytes):
        self.id = id

    def __repr__(self):
        return "RFID Token (" + " ".join(f"{v:02x}" for v in self.id) + ")"


incomingMsgMap = {0: RfidTokenRead}


class MusicMouseProtocol(asyncio.Protocol):
    def __init__(self):
        super()
        self._msg_callback = None

    def register_message_callback(self, cb):
        self._msg_callback = cb

    def connection_made(self, transport):
        self.transport = transport
        self.in_buff = bytes()

    def send_message(self, message):
        msg_content = message.as_bytes()
        header = struct.pack("<IBH", MAGIC_TOKEN_HOST_TO_FW, outgoing_msg_map[type(message)],
                             len(msg_content))
        self.transport.write(header + msg_content)

    def data_received(self, data):
        self.in_buff += data
        self._parse_message()

    def connection_lost(self, exc):
        print('port closed')
        self.transport.loop.stop()

    def pause_writing(self):
        print('pause writing')
        print(self.transport.get_write_buffer_size())

    def resume_writing(self):
        print(self.transport.get_write_buffer_size())
        print('resume writing')

    def _parse_message(self):
        HEADER_SIZE = 4 + 1 + 2
        if len(self.in_buff) == 0:
            return
        if len(self.in_buff) >= HEADER_SIZE:
            token, msg_type, msg_size = struct.unpack("<IBH", self.in_buff[:HEADER_SIZE])
            if token == MAGIC_TOKEN_FW_TO_HOST and len(self.in_buff) >= HEADER_SIZE + msg_size:
                self._on_msg_receive(msg_type, self.in_buff[HEADER_SIZE:HEADER_SIZE + msg_size])
                self.in_buff = self.in_buff[HEADER_SIZE + msg_size:]
            else:
                idx = self.in_buff.find("\n".encode())
                if idx >= 0:
                    text_msg = self.in_buff[:idx]
                    print("LOG:", text_msg.decode())
                    self.in_buff = self.in_buff[idx + 1:]

    def _on_msg_receive(self, msg_type, msg_payload):
        parsed_msg = incomingMsgMap[msg_type](msg_payload)
        if self._msg_callback is not None:
            self._msg_callback(self, parsed_msg)