from fastapi import APIRouter, Query
from services.var_service import compute_var

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


@router.get("/compute")
def var_compute(
    confidence: float = Query(default=0.95, ge=0.90, le=0.99),
    horizon_days: int = Query(default=1, ge=1, le=30),
    lookback_days: int = Query(default=252, ge=60, le=504),
    default_iv: float = Query(default=0.20, ge=0.05, le=0.80),
):
    """Compute portfolio VaR using Black-Scholes delta approach."""
    return compute_var(
        confidence=confidence,
        horizon_days=horizon_days,
        lookback_days=lookback_days,
        default_iv=default_iv,
    )