from fastapi import FastAPI, Query, HTTPException

app = FastAPI()


@app.get("/search")
def search(query: str, n: int = Query(5, ge=1)):
    """
    Endpoint for querying the search engine.
    Args:
        query (str): The search query.
        n (int): Number of results to return (default: 5).
    Returns:
        dict: Query results.
    """
    if not query.strip():
        raise HTTPException(status_code=400, detail="Query cannot be empty.")

    search_engine = app.state.search_engine
    if not search_engine:
        raise HTTPException(status_code=500, detail="Search engine not initialized.")

    try:
        results = search_engine.most_similar(query, n)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=f"An unexpected error occurred: {str(e)}"
        )

    return {"query": query, "results": results}