import asyncio
import logging
from dataclasses import dataclass
from typing import Callable

from color import Color
from color_convert import DeviceColor, zbConv
from mqtt_io import MqttIo
from protocols import Transport, ZigbeeTransport

log = logging.getLogger('light')


@dataclass
class Light:
    name: str
    transport: Transport
    convertColor: Callable[[Color], DeviceColor]

    requestingColor: Color = Color.fromHex('#000000')
    requestingDeviceColor: DeviceColor = DeviceColor()

    emittingColor: Color = Color.fromHex('#000000')
    online: bool | None = None
    latencyMs: float | None = None

    notifyChanged: Callable | None = None

    def __post_init__(self):
        self.requestingDeviceColor = self.convertColor(self.requestingColor)

    def to_dict(self):
        d = {
            'name': self.name,
            'address': self.transport.linked(),
            'requestingColor': self.requestingColor.hex(),
            'requestingDeviceColor': self.requestingDeviceColor.summary(),
            'emittingColor': self.emittingColor.hex(),
            'online': self.online,
            'latencyMs': self.latencyMs,
        }

        return {'light': d}

    async def setColor(self, c: Color):
        log.info(f'setColor from {self.requestingColor} to {c}')
        if c == self.requestingColor:
            return
        self.requestingColor = c
        self.requestingDeviceColor = self.convertColor(self.requestingColor)

        if self.notifyChanged:
            self.notifyChanged()

        # waits for the relevant round-trip
        log.info(f'transport send {self.requestingDeviceColor.summary()}')
        await self.transport.send(self.requestingDeviceColor)

        self.emittingColor = self.requestingColor
        if self.notifyChanged:
            self.notifyChanged()


def makeZbBar(mqtt: MqttIo, name: str, ieee: str) -> Light:
    return Light(name=name, convertColor=zbConv, transport=ZigbeeTransport(mqtt, name, ieee))


class Lights:
    _d: dict[str, Light] = {}

    def __init__(self, mqtt: MqttIo):
        self.mqtt = mqtt

        self.add(makeZbBar(mqtt, 'do-bar', '0xa4c13844948d2da4'))

    def add(self, d: Light):
        d.notifyChanged = self.notifyChanged
        self._d[d.name] = d

        self.notifyChanged()

    def byName(self, name: str) -> Light:
        return self._d[name]

    def to_dict(self):
        return {'lights': [d.to_dict() for d in sorted(self._d.values(), key=lambda r: r.name)]}

    # the following is bad. Get a better events lib.
    _changeSleepTask: asyncio.Task | None = None

    async def changes(self):  # yields None on any data change
        while True:
            log.info('Lights has a change')
            yield None
            self._changeSleepTask = asyncio.create_task(self._sleep())
            try:
                await self._changeSleepTask
            except asyncio.CancelledError:
                pass
            self._changeSleepTask = None

    async def _sleep(self):
        await asyncio.sleep(100)

    def notifyChanged(self):
        log.info('Lights.notifyChanged()')
        if self._changeSleepTask is not None:
            self._changeSleepTask.cancel()