# app/api/dependencies.py
from fastapi import Depends, HTTPException, status
from typing import List
from sqlalchemy.orm import Session
from app.db.session import SessionLocal
from app.core.retrievers import Retriever
from app.core.services.document import DocumentService
from app.core.services.rag import RAGService
from app.core.vector_store.faiss_store import FaissVectorStore

# This is a dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

# This is another common dependency
async def get_current_user(token: str):
    # In a real app, you would decode the token and fetch the user
    if not token:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED)
    return {"email": "user@example.com", "id": 1} # Dummy user


class ServiceContainer:
    def __init__(self, vector_store: FaissVectorStore, retrievers: List[Retriever]):
        # Initialize all services within the container
        self.document_service = DocumentService(vector_store=vector_store)
        self.rag_service = RAGService(
            retrievers=retrievers
        )