"""LiveKit telephony adapter for Voxtra.

LiveKit provides WebRTC-based real-time communication with native
SIP telephony support. This adapter bridges LiveKit rooms with
Voxtra's voice AI pipeline.

NOTE: This is a Phase 2 adapter. The initial MVP focuses on Asterisk ARI.
This stub defines the interface for future implementation.
"""

from __future__ import annotations

import logging
from typing import Any

from voxtra.config import LiveKitConfig
from voxtra.exceptions import TelephonyError
from voxtra.registry import registry
from voxtra.telephony.base import BaseTelephonyAdapter, EventCallback

logger = logging.getLogger("voxtra.telephony.livekit")


@registry.register_telephony("livekit")
class LiveKitAdapter(BaseTelephonyAdapter):
    """LiveKit SIP telephony adapter (Phase 2).

    Connects to LiveKit's SIP infrastructure to:
    - Accept inbound SIP calls via LiveKit SIP trunks
    - Create dispatch rules for call routing
    - Join AI agents to rooms as participants
    - Stream audio via LiveKit's WebRTC transport

    Configuration::

        telephony:
          provider: livekit
          livekit:
            url: ws://localhost:7880
            api_key: "your-api-key"
            api_secret: "your-api-secret"

    Requires the `livekit` and `livekit-agents` packages::

        pip install voxtra[livekit]
    """

    def __init__(self, config: LiveKitConfig) -> None:
        self.config = config
        self._client: Any = None
        self._connected = False

    async def connect(self) -> None:
        """Connect to LiveKit server."""
        try:
            from livekit import api as livekit_api
        except ImportError:
            raise TelephonyError(
                "livekit is required for LiveKitAdapter. "
                "Install with: pip install voxtra[livekit]"
            )

        if not self.config.api_key or not self.config.api_secret:
            raise TelephonyError("LiveKit API key and secret are required")

        self._client = livekit_api.LiveKitAPI(
            url=self.config.url,
            api_key=self.config.api_key,
            api_secret=self.config.api_secret,
        )
        self._connected = True
        logger.info("Connected to LiveKit at %s", self.config.url)

    async def disconnect(self) -> None:
        """Disconnect from LiveKit."""
        self._connected = False
        self._client = None
        logger.info("Disconnected from LiveKit")

    async def listen(self, callback: EventCallback) -> None:
        """Listen for SIP call events from LiveKit.

        TODO: Implement using LiveKit's SIP participant events
        and room event webhooks.
        """
        raise NotImplementedError(
            "LiveKit adapter is not yet implemented. "
            "Use the Asterisk adapter for the current MVP."
        )

    async def answer_call(self, channel_id: str) -> None:
        """Accept a SIP participant in a LiveKit room."""
        raise NotImplementedError("LiveKit adapter: answer_call not yet implemented")

    async def hangup_call(self, channel_id: str) -> None:
        """Remove a SIP participant from a LiveKit room."""
        raise NotImplementedError("LiveKit adapter: hangup_call not yet implemented")

    async def transfer_call(self, channel_id: str, target: str) -> None:
        """Transfer a SIP call via LiveKit."""
        raise NotImplementedError("LiveKit adapter: transfer_call not yet implemented")

    async def hold_call(self, channel_id: str) -> None:
        """Hold a SIP call in LiveKit."""
        raise NotImplementedError("LiveKit adapter: hold_call not yet implemented")

    async def send_dtmf(self, channel_id: str, digits: str) -> None:
        """Send DTMF via LiveKit SIP."""
        raise NotImplementedError("LiveKit adapter: send_dtmf not yet implemented")

    async def create_media_bridge(self, channel_id: str) -> str:
        """Create a media bridge via LiveKit room."""
        raise NotImplementedError("LiveKit adapter: create_media_bridge not yet implemented")

    async def play_audio(self, channel_id: str, audio_uri: str) -> None:
        """Play audio to a SIP participant via LiveKit."""
        raise NotImplementedError("LiveKit adapter: play_audio not yet implemented")
