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}/policies", response_model=list[schemas.PolicyOut])
def list_policies(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.Policy).filter(models.Policy.config_id == config_id).order_by(models.Policy.position).all()


@router.post("/{config_id}/policies", response_model=schemas.PolicyOut, status_code=201)
def create_policy(config_id: int, body: schemas.PolicyCreate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    policy = models.Policy(**body.model_dump(), config_id=config_id)
    db.add(policy)
    db.commit()
    db.refresh(policy)
    return policy


@router.get("/{config_id}/policies/{policy_id}", response_model=schemas.PolicyOut)
def get_policy(config_id: int, policy_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    policy = db.query(models.Policy).filter(models.Policy.id == policy_id, models.Policy.config_id == config_id).first()
    if not policy:
        raise HTTPException(status_code=404, detail="Policy not found")
    return policy


@router.put("/{config_id}/policies/{policy_id}", response_model=schemas.PolicyOut)
def update_policy(config_id: int, policy_id: int, body: schemas.PolicyUpdate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    policy = db.query(models.Policy).filter(models.Policy.id == policy_id, models.Policy.config_id == config_id).first()
    if not policy:
        raise HTTPException(status_code=404, detail="Policy not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(policy, field, value)
    db.commit()
    db.refresh(policy)
    return policy


@router.delete("/{config_id}/policies/{policy_id}", status_code=204)
def delete_policy(config_id: int, policy_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    policy = db.query(models.Policy).filter(models.Policy.id == policy_id, models.Policy.config_id == config_id).first()
    if not policy:
        raise HTTPException(status_code=404, detail="Policy not found")
    db.delete(policy)
    db.commit()