from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from app import models, schemas
from app.auth import get_current_user
from app.database import get_db

router = APIRouter()


def _owner_config(config_id: int, db: Session, user: models.User) -> models.Config:
    config = db.query(models.Config).filter(
        models.Config.id == config_id, models.Config.owner_id == user.id
    ).first()
    if not config:
        raise HTTPException(status_code=404, detail="Config not found")
    return config


@router.get("/{config_id}/snat", response_model=list[schemas.SnatOut])
def list_snat(config_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    return db.query(models.Snat).filter(models.Snat.config_id == config_id).all()


@router.post("/{config_id}/snat", response_model=schemas.SnatOut, status_code=201)
def create_snat(config_id: int, body: schemas.SnatCreate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    snat = models.Snat(**body.model_dump(), config_id=config_id)
    db.add(snat)
    db.commit()
    db.refresh(snat)
    return snat


@router.get("/{config_id}/snat/{snat_id}", response_model=schemas.SnatOut)
def get_snat(config_id: int, snat_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
    if not snat:
        raise HTTPException(status_code=404, detail="SNAT entry not found")
    return snat


@router.put("/{config_id}/snat/{snat_id}", response_model=schemas.SnatOut)
def update_snat(config_id: int, snat_id: int, body: schemas.SnatUpdate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
    if not snat:
        raise HTTPException(status_code=404, detail="SNAT entry not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(snat, field, value)
    db.commit()
    db.refresh(snat)
    return snat


@router.delete("/{config_id}/snat/{snat_id}", status_code=204)
def delete_snat(config_id: int, snat_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
    if not snat:
        raise HTTPException(status_code=404, detail="SNAT entry not found")
    db.delete(snat)
    db.commit()