from fastapi import APIRouter, HTTPException
from app.services.qa import get_answer, chat_history
from app.schemas.chat import ChatRequest, ChatResponse
import time

router = APIRouter()

@router.post("/chat/")
async def chat(request: ChatRequest, session_id: str = "default_session"):
    start_time = time.time()
    
    try:
        answer = get_answer(session_id, request.message)
        latency_ms = int((time.time() - start_time) * 1000)
        return ChatResponse(answer=answer, latency_ms=latency_ms)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Ollama call failed with error: {str(e)}")

@router.get("/health")
async def health():
    return {"status": "healthy"}

@router.get("/sessions")
async def list_sessions():
    return {"sessions": {sid: len(history) for sid, history in chat_history.items()}}