"""
"Conscript reporting"
This server controls all hugveys and the processing of their narratives. It exposes itself for control to the panopticon server.
"""

import os
import time
import yaml
import zmq
from zmq.asyncio import Context

import asyncio
from hugvey.communication import getTopic, zmqSend, zmqReceive
from hugvey.panopticon import Panopticon
from hugvey.story import Story
from hugvey.voice.google import GoogleVoiceClient
from hugvey.voice.player import Player
from hugvey.voice.streamer import AudioStreamer
import json
import logging
import queue
import threading


logger = logging.getLogger("command")

# def exceptionEmitter(a):
#     print(a)
#     def decorate(func):
#         print('decorate')
#         async def call(*args, **kwargs):
#             print('call')
# #             pre(func, *args, **kwargs)
#             try:
#                 result = await func(*args, **kwargs)
#             except Exception as e:
#                 logger.critical(e, "in", func)
#                 raise e
# #             post(func, *args, **kwargs)
#             return result
#         return call
#     return decorate


class CentralCommand(object):
    """docstring for CentralCommand."""

    def __init__(self, debug_mode=False):
        self.debug = debug_mode
        self.eventQueue = asyncio.Queue()
        self.commandQueue = asyncio.Queue()
        self.isRunning = threading.Event()
        self.hugveys = {}
        self.ctx = Context.instance()
        self.hugveyLock = asyncio.Lock()
        self.start_time = time.time()
        self.languageFiles = {}

    def loadConfig(self, filename):
        if hasattr(self, 'config'):
            raise Exception("Overriding config not supported yet")

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

        self.hugvey_ids = [i + 1 for i in range(self.config['hugveys'])]

        self.loadLanguages()
        
        self.panopticon = Panopticon(self, self.config)
    
    def loadLanguages(self):
        logger.debug('load language files')
        self.languages = {}

        for lang in self.config['languages']:
            lang_filename = os.path.join(self.config['web']['files_dir'], lang['file'])
            self.languageFiles[lang['code']] = lang['file']
            with open(lang_filename, 'r') as fp:
                self.languages[lang['code']] = json.load(fp)


    def getHugveyStatus(self, hv_id):
        status = {'id': hv_id}
        if not hv_id in self.hugveys:
            status['status'] = 'off'
            return status

        hv = self.hugveys[hv_id]
        if not hv.story:
            status['status'] = 'off'
            return status
        
        status['status'] = hv.getStatus()
        status['language'] = hv.language_code
        status['msg'] = hv.story.currentMessage.id if hv.story.currentMessage else None
        status['finished'] = hv.story.isFinished()
        status['history'] = hv.story.getLogSummary()
        status['counts'] = {t: len(a) for t, a in status['history'].items() if t != 'directions' } 

        return status

    def getStatusSummary(self):
        status = {
            'uptime': time.time() - self.start_time,
            'languages': self.config['languages'],
            'hugveys': [],
        }

        for hv_id in self.hugvey_ids:
            status['hugveys'].append(self.getHugveyStatus(hv_id))

        return status

    def commandHugvey(self, hv_id, msg):
        """
        prepare command to be picked up by the sender
        """
        if threading.current_thread().getName() != 'MainThread':
            # Threading nightmares! Adding to queue from other thread/loop (not sure which is the isse)
            # won't trigger asyncios queue.get() so we have to do this thread
            # safe, in the right loop
            self.loop.call_soon_threadsafe(self._queueCommand, hv_id, msg)
        else:
            self._queueCommand(hv_id, msg)

    def _queueCommand(self, hv_id, msg):
        self.commandQueue.put_nowait((hv_id, msg))
#         if msg['action'] == 'play':
#             self.commandQueue.put_nowait((hv_id, {
#             'action': 'play',
#             'msg': "This is an interrption",
#             'id': 'test',
#         }))

    def commandAllHugveys(self, msg):
        for hv_id in self.hugvey_ids:
            self.commandHugvey(hv_id, msg)

    def commandAllActiveHugveys(self, msg):
        for hv_id in self.hugveys:
            self.commandHugvey(hv_id, msg)

    async def commandSender(self):
        s = self.ctx.socket(zmq.PUB)
        s.bind(self.config['events']['cmd_address'])

        self.commandAllHugveys({'action': 'show_yourself'})

        # sleep to allow pending connections to connect
        await asyncio.sleep(1)
        logger.info("Ready to publish commands on: {}".format(
            self.config['events']['cmd_address']))
        logger.debug('Already {} items in queue'.format(
            self.commandQueue.qsize()))

        while self.isRunning.is_set():
            hv_id, cmd = await self.commandQueue.get()
            logger.info('Got command to send: {} {}'.format(hv_id, cmd))
            zmqSend(s, hv_id, cmd)

        logger.warn('Stopping command sender')
        s.close()

    async def instantiateHugvey(self, hugvey_id, msg):
        '''
        Start a HugveyState, according to a show_yourself reply

        'event': 'connection',
        'id': self.hugvey_id,
        'host': socket.gethostname(),
        'ip': self.getIp(),
        '''
        async with self.hugveyLock:  # lock to prevent duplicates on creation
            if not hugvey_id in self.hugveys:
                logger.info(f'Instantiate hugvey #{hugvey_id}')
                h = HugveyState(hugvey_id, self)
                h.config(msg['host'], msg['ip'])
                self.hugveys[hugvey_id] = h
                thread = threading.Thread(
                    target=h.start, name=f"hugvey#{hugvey_id}")
                thread.start()
            else:
                logger.info(f'Reconfigure hugvey #{hugvey_id}')
                # (re)configure exisitng hugveys
                h.config(msg['host'], msg['ip'])

    async def eventListener(self):
        s = self.ctx.socket(zmq.SUB)
        s.bind(self.config['events']['listen_address'])
        logger.info("Listen for events on: {}".format(
            self.config['events']['listen_address']))

        for id in self.hugvey_ids:
            s.subscribe(getTopic(id))

        while self.isRunning.is_set():
            try:
                hugvey_id, msg = await zmqReceive(s)
    
                if hugvey_id not in self.hugvey_ids:
                    logger.critical(
                        "Message from alien Hugvey: {}".format(hugvey_id))
                    continue
                elif hugvey_id not in self.hugveys:
                    if msg['event'] == 'connection':
                        # Create a hugvey
                        await self.instantiateHugvey(hugvey_id, msg)
                    else:
                        logger.warning(
                            "Message from uninstantiated Hugvey {}".format(hugvey_id))
                        logger.debug("Message contains: {}".format(msg))
                    continue
                else:
                    self.hugveys[hugvey_id].queueEvent(msg)
#                     await self.hugveys[hugvey_id].eventQueue.put(msg)
            except Exception as e:
                logger.critical(f"Exception while running event loop:")
                logger.exception(e)


    def start(self):
        self.isRunning.set()
        self.loop = asyncio.get_event_loop()
#         self.panopticon_loop = asyncio.new_event_loop()

        self.tasks = {}  # collect tasks so we can cancel in case of error
        self.tasks['eventListener'] = self.loop.create_task(
            self.eventListener())
        self.tasks['commandSender'] = self.loop.create_task(
            self.commandSender())

        # we want the web interface in a separate thread
        self.panopticon_thread = threading.Thread(
            target=self.panopticon.start, name="Panopticon")
        self.panopticon_thread.start()
        
        self.loop.run_forever()

    def stop(self):
        self.isRunning.clear()


class HugveyState(object):
    """Represents the state of a Hugvey client on the server.
    Manages server connections & voice parsing etc.
    """
    
    STATE_PAUSE = "paused"
    STATE_GONE = "gone"
    STATE_RUNNING = "running"

    def __init__(self, id: int, command: CentralCommand):
        
        self.id = id
        self.command = command
        self.logger = logging.getLogger(f"hugvey{self.id}")
        self.loop = asyncio.new_event_loop()
        self.isConfigured = False
        self.isRunning = asyncio.Event(loop=self.loop)
        self.eventQueue = None
        self.language_code = 'en-GB'
        self.story = None
        self.streamer = None
        self.status = self.STATE_PAUSE
        self.google = None
        self.notShuttingDown = True # TODO: allow shutdown of object

    def getStatus(self):
        if self.story.isFinished():
            return "finished"
        return self.status
    
    def config(self, hostname, ip):
        self.ip = ip
        self.hostname = hostname
        self.logger.info(
            f"Hugvey {self.id} at {self.ip}, host: {self.hostname}")

        if self.isConfigured == True:
            # a reconfiguration/reconnection
            pass

        self.isConfigured = True

    def sendCommand(self, msg):
        """
        Send message or command to hugvey
        @param msg: The message to be sent. Probably a dict()
        """
        self.command.commandHugvey(self.id, msg)

    def start(self):
        """
        Start the tasks
        """
        self.isRunning.set()
        self.status = self.STATE_RUNNING
        
        tasks = asyncio.gather(
            self.catchException(self.processAudio()),
            self.catchException(self.handleEvents()),
            self.catchException(self.playStory()),
            loop=self.loop)
#         self.pause()
        self.loop.run_until_complete(tasks)
        

    async def catchException(self, awaitable):
        try:
            await awaitable
        except Exception as e:
            logger.exception(e)
            logger.critical(f"Hugvey restart required but not implemented yet")

            # TODO: restart

    def queueEvent(self, msg):
        if 'time' not in msg:
            # add time, so we can track time passed
            msg['time'] = time.time()
        if not self.eventQueue:
            self.logger.critical("No event queue to put {}".format(msg))
        else:
            # Allow for both the Hugvey Command, or the Story handle the event.
            self.loop.call_soon_threadsafe(self._queueEvent, msg)
            
            
    def _queueEvent(self, msg):
        self.logger.debug(f"Queue event in hugvey loop: {msg}")
        self.eventQueue.put_nowait(msg)
        self.story.events.append(msg)

    async def handleEvents(self):
        self.eventQueue = asyncio.Queue()  # start event queue here, to avoid loop issues
        while self.command.isRunning.is_set():
            event = await self.eventQueue.get()
            self.logger.info("Received: {}".format(event))
            
            if event['event'] == 'connection' and not self.isRunning.is_set():
                self.restart()

            if event['event'] == 'language':
                self.setLanguage(event['code'])
                
            if event['event'] == 'pause':
                self.pause()
            if event['event'] == 'restart':
                self.restart()
            if event['event'] == 'resume':
                self.resume()
            
            if event['event'] == 'change_language':
                self.setLanguage(event['lang_code'])
            if event['event'] == 'play_msg':
                self.logger.info("DO PLAY :-)")
                if not self.story:
                    self.logger.critical("No story to play message in")
                else:
                    #restart first so that story loads the new json
                    self.restart() 
                    # wait a tat for the restart loops to complete
                    await asyncio.sleep(.1)
                    msg = self.story.get(event['msg_id'])
                    if not msg:
                        self.logger.critical("Invalid ID to play: {}".format(event['msg_id']))
                    else:    
                        self.story.setCurrentMessage(msg)

        self.eventQueue = None

    def setLanguage(self, language_code):
        if language_code not in self.command.languages:
            raise Exception("Invalid language {}".format(language_code))
        
        self.logger.info(f"set language: {language_code}")
        self.language_code = language_code
        self.google.setLanguage(language_code)
        
        self.restart()

#         self.story.reset()
#         self.story.setStoryData(self.command.languages[language_code])
    
    def pause(self):
        self.logger.info('Pause')
        if self.google:
            self.google.pause()
        if self.story:
            self.story.pause()
        self.isRunning.clear()
        self.status = self.STATE_PAUSE
    
    def resume(self):
        """ Start playing without reset"""
        self.logger.info('Resume')
        if self.google:
            self.google.resume()
        if self.story:
            self.story.resume()
        self.isRunning.set()
        self.status = self.STATE_RUNNING
    
    def restart(self):
        """ Start playing with reset"""
        self.logger.info('Restart')
        if self.story:
            self.story.stop()
        self.resume()
        self.isRunning.set()
    
    def gone(self):
        '''Status to 'gone' as in, shutdown/crashed/whatever
        '''
        self.pause()
        if self.story:
            self.story.stop()
            
        self.logger.info('Gone')
        self.status = self.STATE_GONE
        

    async def playStory(self):
        while self.notShuttingDown:
            await self.isRunning.wait()
            
            # new story instance on each run
            self.story = Story(self)
            self.story.setStoryData(self.command.languages[self.language_code])
            await self.story.run()
#             self.story = None
    
    def getStreamer(self):
        if not self.streamer:
            self.streamer = AudioStreamer(
                self.command.config['voice']['chunk'],
                self.ip,
                int(self.command.config['voice']['port']))
    
            if self.command.debug:
                self.logger.warn("Debug on: Connecting Audio player")
                self.player = Player(
                    self.command.config['voice']['src_rate'], self.command.config['voice']['out_rate'])
                self.streamer.addConsumer(self.player)
    
            self.logger.info("Start Speech")
            self.google = GoogleVoiceClient(
                hugvey=self,
                src_rate=self.command.config['voice']['src_rate'],
                credential_file=self.command.config['voice']['google_credentials'],
                language_code=self.language_code
            )
            self.streamer.addConsumer(self.google)
        return self.streamer

    async def processAudio(self):
        '''
        Start the audio streamer service
        '''
        
        self.logger.info("Start audio stream")

        while self.notShuttingDown:
            await self.isRunning.wait()
            
            self.logger.info("Start audio stream")
            await self.getStreamer().run()
            self.logger.warn("stream has left the building")
            # if we end up here, the streamer finished, probably meaning hte hugvey shutdown
            self.gone()