from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from app.auth.dependencies import get_current_user, require_role
from app.database import get_db
from app.models.currency import Currency
from app.schemas.currency import CurrencyCreate, CurrencyUpdate, CurrencyOut

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

require_accountant = require_role("accountant")


@router.get("", response_model=list[CurrencyOut])
def list_currencies(db: Session = Depends(get_db), _=Depends(get_current_user)):
    return db.query(Currency).order_by(Currency.code).all()


@router.get("/{currency_id}", response_model=CurrencyOut)
def get_currency(currency_id: int, db: Session = Depends(get_db), _=Depends(get_current_user)):
    obj = db.get(Currency, currency_id)
    if not obj:
        raise HTTPException(status_code=404, detail="Currency not found")
    return obj


@router.post("", response_model=CurrencyOut, status_code=status.HTTP_201_CREATED)
def create_currency(body: CurrencyCreate, db: Session = Depends(get_db), _=Depends(require_accountant)):
    if db.query(Currency).filter(Currency.code == body.code.upper()).first():
        raise HTTPException(status_code=400, detail="Currency code already exists")
    obj = Currency(**body.model_dump(), code=body.code.upper())
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


@router.patch("/{currency_id}", response_model=CurrencyOut)
def update_currency(currency_id: int, body: CurrencyUpdate, db: Session = Depends(get_db), _=Depends(require_accountant)):
    obj = db.get(Currency, currency_id)
    if not obj:
        raise HTTPException(status_code=404, detail="Currency not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(obj, field, value)
    db.commit()
    db.refresh(obj)
    return obj


@router.delete("/{currency_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_currency(currency_id: int, db: Session = Depends(get_db), _=Depends(require_accountant)):
    obj = db.get(Currency, currency_id)
    if not obj:
        raise HTTPException(status_code=404, detail="Currency not found")
    db.delete(obj)
    db.commit()