import pyaudio
import socket
import select
import audioop
import threading
import logging
import time
import zmq
import asyncio
from zmq.asyncio import Context
import yaml
import re
from .communication import zmqReceive, zmqSend, getTopic

logger = logging.getLogger("client")

class VoiceServer(object):
    """A UDP server, providing mic data at 16 kHz"""
    def __init__(self, voice_port: int, input_rate: int, input_name: str = None, target_rate: int = 16000):
        self.voice_port = voice_port
        self.input_rate = input_rate
        self.target_rate = target_rate
        self.stopped = True
        self.clients = []
        self.laststate = None
        self.input_name = input_name

    def get_input_idx(self):
        input_device_idx = None
        # input_device_idx = 6
        # input_device_idx = 0
        devices_count = self.p.get_device_count()
        for i in range(devices_count):
             dev = self.p.get_device_info_by_index(i)
             if input_device_idx is None and dev['maxInputChannels'] > 0:
                 if (self.input_name and self.input_name in dev['name']) or \
                 (not self.input_name and dev['name'] != 'default'):
                     input_device_idx = dev['index']
                     logger.info("Use device {0}: {1}".format(dev['index'],dev['name']))
             logger.debug("{} {:0d} {}".format("* " if input_device_idx == i else "- ", i, dev['name']))
        return input_device_idx


    def onBuffer(self, in_data, frame_count, time_info, status):
        if self.input_rate == self.target_rate:
            f = in_data
        else:
            f, self.laststate = audioop.ratecv(in_data, 2, 1, self.input_rate, self.target_rate, self.laststate)

        for s in self.clients:
            try:
                s.send(f)
            except Exception as e:
                self.clients.remove(s)
                logger.warn("Error sending to {}".format(s.getsockname()))
                pass
        return (None, pyaudio.paContinue)

    def start(self):
        FORMAT = pyaudio.paInt16
        CHANNELS = 1
        CHUNK = 4096

        self.p = pyaudio.PyAudio()
        self.stopped = False

        stream = self.p.open(
            format=FORMAT,
            channels=CHANNELS,
            rate=self.input_rate,
            input=True,
            frames_per_buffer=CHUNK,
            stream_callback=self.onBuffer,
            input_device_index=self.get_input_idx()
            )

        while not self.stopped:
            try:
                self.voice_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                self.voice_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                self.voice_socket.bind(('', self.voice_port))
                self.voice_socket.listen(5)

                read_list = [self.voice_socket]
                logger.info( "Waiting for connections")
                while not self.stopped:
                    (clientsocket, address) = self.voice_socket.accept()
                    self.clients.append(clientsocket)

                logger.info( "Stop recording & streaming")
                self.voice_socket.close()
                # stop Recording
                stream.stop_stream()
                stream.close()
                self.p.terminate()
            except Exception as e:
                logging.critical("Socket Exception {}".format(e))
                self.voice_socket.close()
                time.sleep(.5)

    def stop(self):
        self.stopped = True

    async def asyncStart(self, loop):
        future = loop.run_in_executor(None, self.start)
        r = await future
        # await self.start()

class CommandHandler(object):
    def __init__(self, hugvey_id, cmd_address = "tcp://127.0.0.1:5555", publish_address = "tcp://0.0.0.0:5555"):
        self.eventQueue = []
        self.ctx = Context.instance()
        self.hugvey_id = hugvey_id
        self.cmd_address = cmd_address
        self.publish_address = publish_address
        # self.showMyself() # queue message for connection request

    def handle(self, cmd):
        # self.sendMessage({'reply':'test'})
        if not 'action' in cmd:
            logger.critical("Invalid command: {}".format(cmd))
            return

        logger.info("Received {}".format(cmd))
        if cmd['action'] == 'show_yourself':
            self.showMyself()
        if cmd['action'] == 'play':
            self.cmdPlay(cmd['id'], cmd['msg'])


    def cmdPlay(self, msgId, msgText):
        # espeak(msgText)
        # TODO kill if playing & play wave file
        # preferably a cat (local)/curl (remote) pipe into player
        logger.info("Play: {}".format(msgText))
        time.sleep(2)
        self.sendMessage({
            'event': 'playbackFinish',
            'msgId': msgId
        })

    def showMyself(self):
        """Publish about this hugvey to central command
        """
        self.sendMessage({
            'event': 'connection',
            'id': self.hugvey_id,
            'host': socket.gethostname(),
            'ip': self.getIp(),
        })

    @staticmethod
    def getIp():
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(("185.66.250.60", 80))
        return s.getsockname()[0]


    def sendMessage(self, msg):
        self.eventQueue.append(msg)

    async def command_listener(self):
        s = self.ctx.socket(zmq.SUB)
        s.connect(self.cmd_address)
        topic = getTopic(self.hugvey_id)
        s.subscribe(topic)
        logger.info("Subscribed to commands for {} on {}".format(topic, self.cmd_address))
        while True:
            hugvey_id, cmd = await zmqReceive(s)
            self.handle(cmd)
            # topic, msg = await s.recv_multipart()
            # print('received', msg, time.time())
        s.close()

    async def event_sender(self):
        s = self.ctx.socket(zmq.PUB)
        s.connect(self.publish_address)
        logger.info("Publish on: {}".format(self.publish_address))
        # For some reason, sending only one message is lost, perhaps due
        # to connect() rather than bind() ??
        self.showMyself()
        while True:
            for i in range(len(self.eventQueue)):
                zmqSend(s, self.hugvey_id, self.eventQueue.pop(0))
            if len(self.eventQueue) == 0:
                await asyncio.sleep(0.05)

        s.close()

class Hugvey(object):
    """The Hugvey client, to be ran on the Raspberry Pi's
    """
    def __init__(self):
        self.id = self.getId()
        pass

    def getId(self) -> int:
        """Get Hugvey ID from hostname"""
        h = socket.gethostname()
        return int(re.findall('\d+', h )[0])

    def loadConfig(self, filename):
        with open(filename, 'r') as fp:
            logger.debug('Load config from {}'.format(filename))
            self.config = yaml.safe_load(fp)

    async def startCommandListener():
        return await self.cmd_server.command_listener()

    def start(self):
        self.voice_server = VoiceServer(
            voice_port = int(self.config['voice']['port']),
            input_rate = int(self.config['voice']['input_rate']),
            input_name = self.config['voice']['input_name'],
            target_rate = int(self.config['voice']['target_rate']),
            )
        self.cmd_server = CommandHandler(
            hugvey_id = self.id,
            cmd_address = self.config['events']['cmd_address'],
            publish_address = self.config['events']['publish_address'],
            )
        loop = asyncio.get_event_loop()
        logger.info('start')
        # self.voice_server.asyncStart(loop)
        # loop.run_until_complete(self.voice_server.start())
        asyncio.ensure_future(self.voice_server.asyncStart(loop))
        asyncio.ensure_future(self.cmd_server.command_listener())
        asyncio.ensure_future(self.cmd_server.event_sender())
        self.cmd_server.showMyself()
        loop.run_forever()
        logger.info('done')