mission-control-v2/backend/routers/voice.py

"""
Voice-Endpoints für „Mit Hermes reden" (Browser-Voice + 3D-Avatar).

Dünner Layer: STT/TTS werden zum Voice-Sidecar (:8650) geproxyt; der Chat geht an den
Hermes-`api_server` (:8642, OpenAI-kompatibel) — denselben vollen Agenten mit Tools +
geteiltem Mem0 wie CLI/Telegram. Mit stabilem `X-Hermes-Session-Id` hält die Plattform den
Transcript server-seitig, daher schickt der Client je Turn nur die neue User-Nachricht.

LAN-only (kein Token in der 2.0-Phase), wie die übrigen MC2-Endpoints.
"""

import logging

import httpx
from fastapi import APIRouter, File, Form, HTTPException, UploadFile
from fastapi.responses import Response, StreamingResponse
from pydantic import BaseModel

from config import HERMES_API_KEY, HERMES_API_MODEL, HERMES_API_URL, VOICE_SERVICE_URL

log = logging.getLogger(__name__)
router = APIRouter(prefix="/api")

_TIMEOUT = httpx.Timeout(120.0, connect=5.0)   # Chatterbox-TTS auf CPU darf dauern


class TTSIn(BaseModel):
    text: str
    engine: str = "piper"
    voice: str = ""
    language: str = ""
    ref_path: str = ""


class ChatIn(BaseModel):
    text: str                       # die neue User-Äußerung (STT-Ergebnis)
    session_id: str                 # stabiler Voice-Faden → server-seitiger Transcript
    session_key: str = ""           # optional: Langzeit-Memory-Scope
    system: str = ""                # optionaler ephemerer System-Prompt (z.B. „antworte knapp/gesprochen")
    model: str = ""


@router.get("/voice/health")
def voice_health() -> dict:
    """Erreichbarkeit des Voice-Sidecars + ob der Hermes-API-Key gesetzt ist."""
    out: dict = {"sidecar": False, "hermes_key": bool(HERMES_API_KEY)}
    try:
        r = httpx.get(f"{VOICE_SERVICE_URL}/health", timeout=httpx.Timeout(5.0))
        out["sidecar"] = r.status_code == 200
        out["detail"] = r.json() if r.status_code == 200 else None
    except Exception as exc:  # noqa: BLE001
        out["error"] = str(exc)
    return out


@router.get("/voice/voices")
def voice_voices() -> dict:
    try:
        r = httpx.get(f"{VOICE_SERVICE_URL}/voices", timeout=httpx.Timeout(10.0))
        r.raise_for_status()
        return r.json()
    except Exception as exc:  # noqa: BLE001
        raise HTTPException(502, f"Voice-Sidecar nicht erreichbar: {exc}")


@router.post("/voice/stt")
async def voice_stt(audio: UploadFile = File(...), language: str = Form(default="")) -> dict:
    """Mikro-Audio → Text (Proxy auf Sidecar /stt)."""
    data = await audio.read()
    if not data:
        raise HTTPException(400, "Leeres Audio.")
    files = {"audio": (audio.filename or "rec.webm", data, audio.content_type or "audio/webm")}
    try:
        async with httpx.AsyncClient(timeout=_TIMEOUT) as client:
            r = await client.post(f"{VOICE_SERVICE_URL}/stt", files=files, data={"language": language})
            r.raise_for_status()
            return r.json()
    except httpx.HTTPError as exc:
        raise HTTPException(502, f"STT fehlgeschlagen: {exc}")


@router.post("/voice/tts")
async def voice_tts(body: TTSIn) -> Response:
    """Text → Sprache (Proxy auf Sidecar /tts), liefert WAV-Bytes."""
    try:
        async with httpx.AsyncClient(timeout=_TIMEOUT) as client:
            r = await client.post(f"{VOICE_SERVICE_URL}/tts", json=body.model_dump())
            r.raise_for_status()
            return Response(content=r.content, media_type=r.headers.get("content-type", "audio/wav"))
    except httpx.HTTPError as exc:
        raise HTTPException(502, f"TTS fehlgeschlagen: {exc}")


@router.post("/voice/chat")
async def voice_chat(body: ChatIn) -> StreamingResponse:
    """Neue User-Äußerung → Hermes-Agent (api_server, streamend). SSE wird 1:1 durchgereicht.

    Mit `X-Hermes-Session-Id` hält die Plattform den Verlauf — wir senden nur die neue Nachricht.
    Auth per Bearer (API_SERVER_KEY); ohne Key liefert :8642 ein 401."""
    if not HERMES_API_KEY:
        raise HTTPException(503, "HERMES_API_KEY/API_SERVER_KEY nicht gesetzt — Agent-Auth fehlt.")

    messages = []
    if body.system:
        messages.append({"role": "system", "content": body.system})
    messages.append({"role": "user", "content": body.text})
    payload = {"model": body.model or HERMES_API_MODEL, "messages": messages, "stream": True}
    headers = {
        "Authorization": f"Bearer {HERMES_API_KEY}",
        "X-Hermes-Session-Id": body.session_id,
    }
    if body.session_key:
        headers["X-Hermes-Session-Key"] = body.session_key

    async def gen():
        try:
            async with httpx.AsyncClient(timeout=httpx.Timeout(None, connect=5.0)) as client:
                async with client.stream(
                    "POST", f"{HERMES_API_URL}/v1/chat/completions", json=payload, headers=headers,
                ) as r:
                    if r.status_code != 200:
                        detail = (await r.aread()).decode("utf-8", "replace")[:500]
                        yield f"data: {{\"error\": \"Hermes {r.status_code}: {detail}\"}}\n\n".encode()
                        return
                    async for chunk in r.aiter_raw():
                        yield chunk
        except httpx.HTTPError as exc:
            yield f"data: {{\"error\": \"Verbindung zu Hermes fehlgeschlagen: {exc}\"}}\n\n".encode()

    return StreamingResponse(gen(), media_type="text/event-stream")