import asyncio
import json
import logging
import threading

from ..database.sqlite import SQLiteBase
from ..config import config
from .. import http

from typing import Type
from ..util import Addr

logger = logging.getLogger(__name__)


class SoundSensorHitHandler(asyncio.DatagramProtocol):
    def datagram_received(self, data, addr):
        try:
            data = json.loads(data)
        except json.JSONDecodeError as e:
            logger.error('failed to parse json datagram')
            logger.exception(e)
            return

        try:
            name, hits = data
        except (ValueError, IndexError) as e:
            logger.error('failed to unpack data')
            logger.exception(e)
            return

        self.handler(name, hits)

    def handler(self, name: str, hits: int):
        pass


class Database(SQLiteBase):
    SCHEMA = 1

    def __init__(self):
        super().__init__(dbname='sound_sensor_server')

    def schema_init(self, version: int) -> None:
        cursor = self.cursor()

        if version < 1:
            cursor.execute("CREATE TABLE IF NOT EXISTS status (guard_enabled INTEGER NOT NULL)")
            cursor.execute("INSERT INTO status (guard_enabled) VALUES (-1)")

        self.commit()

    def get_guard_enabled(self) -> int:
        cur = self.cursor()
        cur.execute("SELECT guard_enabled FROM status LIMIT 1")
        return int(cur.fetchone()[0])

    def set_guard_enabled(self, enabled: bool) -> None:
        cur = self.cursor()
        cur.execute("UPDATE status SET guard_enabled=?", (int(enabled),))


class SoundSensorServer:
    def __init__(self,
                 addr: Addr,
                 handler_impl: Type[SoundSensorHitHandler]):
        self.addr = addr
        self.impl = handler_impl
        self.db = Database()

        self._recording_lock = threading.Lock()
        self._recording_enabled = True

        if self.guard_control_enabled():
            current_status = self.db.get_guard_enabled()
            if current_status == -1:
                self.set_recording(config['server']['guard_recording_default']
                                   if 'guard_recording_default' in config['server']
                                   else False)
            else:
                self.set_recording(bool(current_status), update=False)

    @staticmethod
    def guard_control_enabled() -> bool:
        return 'guard_control' in config['server'] and config['server']['guard_control'] is True

    def set_recording(self, enabled: bool, update=True):
        with self._recording_lock:
            self._recording_enabled = enabled
        if update:
            self.db.set_guard_enabled(enabled)

    def is_recording_enabled(self) -> bool:
        with self._recording_lock:
            return self._recording_enabled

    def run(self):
        if self.guard_control_enabled():
            t = threading.Thread(target=self.run_guard_server)
            t.daemon = True
            t.start()

        loop = asyncio.get_event_loop()
        t = loop.create_datagram_endpoint(self.impl, local_addr=self.addr)
        loop.run_until_complete(t)
        loop.run_forever()

    def run_guard_server(self):
        routes = http.routes()

        @routes.post('/guard/enable')
        async def guard_enable(request):
            self.set_recording(True)
            return http.ok()

        @routes.post('/guard/disable')
        async def guard_disable(request):
            self.set_recording(False)
            return http.ok()

        @routes.get('/guard/status')
        async def guard_status(request):
            return http.ok({'enabled': self.is_recording_enabled()})

        asyncio.set_event_loop(asyncio.new_event_loop())  # need to create new event loop in new thread
        http.serve(self.addr, routes, handle_signals=False)  # handle_signals=True doesn't work in separate thread