"""Hotkey-Listener via evdev für Push-to-Talk."""

import asyncio
import logging
from pathlib import Path
from typing import Callable, Coroutine

import evdev
from evdev import InputDevice, categorize, ecodes

logger = logging.getLogger(__name__)

AsyncCallback = Callable[[], Coroutine]


def find_keyboard_device() -> InputDevice:
    """Findet das erste Keyboard-Device in /dev/input/."""
    devices = [InputDevice(path) for path in evdev.list_devices()]
    for device in devices:
        capabilities = device.capabilities(verbose=True)
        for (etype_name, _etype_code), events in capabilities.items():
            if etype_name == "EV_KEY":
                key_names = [name for name, _code in events]
                if "KEY_A" in key_names:
                    logger.info("Keyboard gefunden: %s (%s)", device.name, device.path)
                    return device
    raise RuntimeError("Kein Keyboard-Device gefunden in /dev/input/")


class HotkeyListener:
    def __init__(self, key_name: str = "KEY_F12"):
        self.key_name = key_name
        self.key_code = ecodes.ecodes.get(key_name)
        if self.key_code is None:
            raise ValueError(f"Unbekannter Key-Name: {key_name}")
        self.on_press: AsyncCallback | None = None
        self.on_release: AsyncCallback | None = None

    async def _handle_key_event(self, key_down: bool) -> None:
        """Ruft den passenden Callback auf."""
        if key_down and self.on_press:
            await self.on_press()
        elif not key_down and self.on_release:
            await self.on_release()

    async def listen(self) -> None:
        """Lauscht auf evdev-Events der konfigurierten Taste."""
        device = find_keyboard_device()
        logger.info("Lausche auf %s auf %s", self.key_name, device.name)
        async for event in device.async_read_loop():
            if event.type == ecodes.EV_KEY and event.code == self.key_code:
                if event.value == 1:  # Key down
                    logger.debug("%s gedrückt", self.key_name)
                    await self._handle_key_event(key_down=True)
                elif event.value == 0:  # Key up
                    logger.debug("%s losgelassen", self.key_name)
                    await self._handle_key_event(key_down=False)