"""Chat REST route — POST /chat fallback when WS is unavailable."""

from __future__ import annotations

from fastapi import APIRouter, Request
from fastapi.responses import JSONResponse

from shared.schemas import ChatRequest

from app.deep_agent import run_home
from app.ws_context import clear_current_user, set_current_user

router = APIRouter(prefix="/chat", tags=["chat"])


@router.post("")
async def chat(body: ChatRequest, request: Request) -> JSONResponse:
    """REST fallback for home chat.

    In the microservices setup, Traefik ForwardAuth has already validated
    the JWT and injected X-User-Id / X-User-Email / X-User-Tier headers.
    """
    user_id = request.headers.get("X-User-Id", "")
    if not user_id:
        return JSONResponse(status_code=401, content={"detail": "Missing X-User-Id header"})

    set_current_user(user_id)
    try:
        response = await run_home(
            user_id=user_id,
            message=body.message,
            context=body.context.model_dump(),
        )
    finally:
        clear_current_user()

    return JSONResponse(content={"response": response})