import os
import shutil
from fastapi import APIRouter, UploadFile, File, HTTPException
from typing import Dict, Any

from app.services.embedding_service import process_and_create_embeddings

router = APIRouter()


@router.post("/create-embeddings")
async def create_embeddings(file: UploadFile = File(...)):
    """
    Create embeddings from an uploaded Excel or CSV file containing question-answer pairs.

    - **file**: The Excel or CSV file containing questions and answers

    Returns a success message if embeddings are created successfully.
    """
    # Get file extension
    file_extension = os.path.splitext(file.filename)[1].lower()

    # Determine file type based on extension
    if file_extension == ".xlsx" or file_extension == ".xls":
        file_type = "excel"
    elif file_extension == ".csv":
        file_type = "csv"
    else:
        raise HTTPException(
            status_code=400,
            detail="Unsupported file type. Please upload an Excel (.xlsx, .xls) or CSV (.csv) file.",
        )

    # Ensure temp directory exists
    temp_dir = "/app/temp"
    if not os.path.exists(temp_dir):
        os.makedirs(temp_dir, exist_ok=True)

    # Create a temporary file to store the uploaded file
    safe_filename = os.path.basename(file.filename).replace(" ", "_")
    temp_file_path = os.path.join(temp_dir, f"temp_{safe_filename}")

    try:
        # Save the uploaded file
        with open(temp_file_path, "wb") as buffer:
            shutil.copyfileobj(file.file, buffer)

        # Process the file and create embeddings
        result = process_and_create_embeddings(temp_file_path, file_type)

        if result["status"] == "error":
            raise HTTPException(status_code=400, detail=result["message"])

        return result
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))
    finally:
        # Clean up the temporary file
        if os.path.exists(temp_file_path):
            try:
                os.remove(temp_file_path)
            except Exception as e:
                print(
                    f"Warning: Could not remove temporary file {temp_file_path}: {str(e)}"
                )