from fastapi import APIRouter, HTTPException, Depends
from typing import List

from services.simulation import run_simulation
from sqlalchemy.orm import Session
from config.database import SessionLocal

router = APIRouter(prefix="/api/simulations", tags=["Simulations"])


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@router.post("/run", response_model=List[dict])
async def simulate(params: List[dict], iterations: int = 1000, db: Session = Depends(get_db)):
    if not params:
        raise HTTPException(status_code=400, detail="No parameters provided")
    # TODO: you might use db to fetch scenario info or persist results
    results = run_simulation(params, iterations)
    return results