import json
import logging

from fastapi import APIRouter, Depends, Request, status
from fastapi.responses import PlainTextResponse, Response
from pydantic import ValidationError
from sqlalchemy.orm import Session

from app.dependencies import get_db
from app.schemas.homeassistant import HomeAssistantPublishEnvelope
from app.services.homeassistant_inbound import (
    UnsupportedHomeAssistantMessage,
    handle_homeassistant_message,
)

router = APIRouter(tags=["homeassistant"])
logger = logging.getLogger(__name__)
BAD_REQUEST_MESSAGE = "bad request"
INTERNAL_SERVER_ERROR_MESSAGE = "internal server error"


@router.post("/homeassistant/publish")
async def publish_from_homeassistant(
    request: Request, db: Session = Depends(get_db)
) -> Response:
    try:
        raw_payload = await request.body()
        data = json.loads(raw_payload)
        envelope = HomeAssistantPublishEnvelope.model_validate(data)
        handle_homeassistant_message(db, envelope)
    except json.JSONDecodeError as exc:
        logger.warning("Rejected Home Assistant publish request due to invalid JSON: %s", exc)
        return PlainTextResponse(BAD_REQUEST_MESSAGE, status_code=status.HTTP_400_BAD_REQUEST)
    except ValidationError as exc:
        logger.warning(
            "Rejected Home Assistant publish request due to validation failure: %s", exc
        )
        return PlainTextResponse(BAD_REQUEST_MESSAGE, status_code=status.HTTP_400_BAD_REQUEST)
    except UnsupportedHomeAssistantMessage as exc:
        logger.warning("Home Assistant publish target/action unsupported: %s", exc)
        return PlainTextResponse(
            INTERNAL_SERVER_ERROR_MESSAGE,
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )
    except ValueError as exc:
        logger.warning("Rejected Home Assistant publish request due to invalid content: %s", exc)
        return PlainTextResponse(BAD_REQUEST_MESSAGE, status_code=status.HTTP_400_BAD_REQUEST)

    return Response(status_code=status.HTTP_200_OK)