#!/usr/bin/env python3
import logging
import threading
import include_homekit

from time import sleep
from typing import Optional, List, Dict, Tuple
from functools import partial
from homekit.config import config
from homekit.util import Addr
from homekit.api import WebApiClient, RequestParams
from homekit.api.types import SoundSensorLocation
from homekit.soundsensor import SoundSensorServer, SoundSensorHitHandler
from homekit.media import MediaNodeType, SoundRecordClient, CameraRecordClient, RecordClient

interrupted = False
logger = logging.getLogger(__name__)
server: SoundSensorServer


def get_related_nodes(node_type: MediaNodeType,
                      sensor_name: str) -> List[str]:
    try:
        if sensor_name not in config[f'sensor_to_{node_type.name.lower()}_nodes_relations']:
            raise ValueError(f'unexpected sensor name {sensor_name}')
        return config[f'sensor_to_{node_type.name.lower()}_nodes_relations'][sensor_name]
    except KeyError:
        return []


def get_node_config(node_type: MediaNodeType,
                    name: str) -> Optional[dict]:
    if name in config[f'{node_type.name.lower()}_nodes']:
        cfg = config[f'{node_type.name.lower()}_nodes'][name]
        if 'min_hits' not in cfg:
            cfg['min_hits'] = 1
        return cfg
    else:
        return None


class HitCounter:
    def __init__(self):
        self.sensors = {}
        self.lock = threading.Lock()
        self._reset_sensors()

    def _reset_sensors(self):
        for loc in SoundSensorLocation:
            self.sensors[loc.name.lower()] = 0

    def add(self, name: str, hits: int):
        if name not in self.sensors:
            raise ValueError(f'sensor {name} not found')

        with self.lock:
            self.sensors[name] += hits

    def get_all(self) -> List[Tuple[str, int]]:
        vals = []
        with self.lock:
            for name, hits in self.sensors.items():
                if hits > 0:
                    vals.append((name, hits))
            self._reset_sensors()
        return vals


class HitHandler(SoundSensorHitHandler):
    def handler(self, name: str, hits: int):
        if not hasattr(SoundSensorLocation, name.upper()):
            logger.error(f'invalid sensor name: {name}')
            return

        should_continue = False
        for node_type in MediaNodeType:
            try:
                nodes = get_related_nodes(node_type, name)
            except ValueError:
                logger.error(f'config for {node_type.name.lower()} node {name} not found')
                return

            for node in nodes:
                node_config = get_node_config(node_type, node)
                if node_config is None:
                    logger.error(f'config for {node_type.name.lower()} node {node} not found')
                    continue
                if hits < node_config['min_hits']:
                    continue
                should_continue = True

        if not should_continue:
            return

        hc.add(name, hits)

        if not server.is_recording_enabled():
            return
        for node_type in MediaNodeType:
            try:
                nodes = get_related_nodes(node_type, name)
                for node in nodes:
                    node_config = get_node_config(node_type, node)
                    if node_config is None:
                        logger.error(f'node config for {node_type.name.lower()} node {node} not found')
                        continue

                    durations = node_config['durations']
                    dur = durations[1] if hits > node_config['min_hits'] else durations[0]
                    record_clients[node_type].record(node, dur*60, {'node': node})

            except ValueError as exc:
                logger.exception(exc)


def hits_sender():
    while not interrupted:
        all_hits = hc.get_all()
        if all_hits:
            api.add_sound_sensor_hits(all_hits)
        sleep(5)


api: Optional[WebApiClient] = None
hc: Optional[HitCounter] = None
record_clients: Dict[MediaNodeType, RecordClient] = {}


# record callbacks
# ----------------

def record_error(type: MediaNodeType,
                 info: dict,
                 userdata: dict):
    node = userdata['node']
    logger.error('recording ' + str(dict) + f' from {type.name.lower()} node ' + node + ' failed')

    record_clients[type].forget(node, info['id'])


def record_finished(type: MediaNodeType,
                    info: dict,
                    fn: str,
                    userdata: dict):
    logger.debug(f'{type.name.lower()} record finished: ' + str(info))

    # audio could have been requested by other user (telegram bot, for example)
    # so we shouldn't 'forget' it here

    # node = userdata['node']
    # record.forget(node, info['id'])


# api client callbacks
# --------------------

def api_error_handler(exc, name, req: RequestParams):
    logger.error(f'api call ({name}, params={req.params}) failed, exception below')
    logger.exception(exc)


if __name__ == '__main__':
    config.load_app('sound_sensor_server')

    hc = HitCounter()
    api = WebApiClient(timeout=(10, 60))
    api.enable_async(error_handler=api_error_handler)

    t = threading.Thread(target=hits_sender)
    t.daemon = True
    t.start()

    sound_nodes = {}
    if 'sound_nodes' in config:
        for nodename, nodecfg in config['sound_nodes'].items():
            sound_nodes[nodename] = Addr.fromstring(nodecfg['addr'])

    camera_nodes = {}
    if 'camera_nodes' in config:
        for nodename, nodecfg in config['camera_nodes'].items():
            camera_nodes[nodename] = Addr.fromstring(nodecfg['addr'])

    if sound_nodes:
        record_clients[MediaNodeType.SOUND] = SoundRecordClient(sound_nodes,
                                                                error_handler=partial(record_error, MediaNodeType.SOUND),
                                                                finished_handler=partial(record_finished, MediaNodeType.SOUND))

    if camera_nodes:
        record_clients[MediaNodeType.CAMERA] = CameraRecordClient(camera_nodes,
                                                                  error_handler=partial(record_error, MediaNodeType.CAMERA),
                                                                  finished_handler=partial(record_finished, MediaNodeType.CAMERA))

    try:
        server = SoundSensorServer(config.get_addr('server.listen'), HitHandler)
        server.run()
    except KeyboardInterrupt:
        interrupted = True
        for c in record_clients.values():
            c.stop()
        logging.info('keyboard interrupt, exiting...')