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}/hosts", response_model=list[schemas.HostOut])
def list_hosts(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.Host).filter(models.Host.config_id == config_id).all()


@router.post("/{config_id}/hosts", response_model=schemas.HostOut, status_code=201)
def create_host(config_id: int, body: schemas.HostCreate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    host = models.Host(**body.model_dump(), config_id=config_id)
    db.add(host)
    db.commit()
    db.refresh(host)
    return host


@router.get("/{config_id}/hosts/{host_id}", response_model=schemas.HostOut)
def get_host(config_id: int, host_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    host = db.query(models.Host).filter(models.Host.id == host_id, models.Host.config_id == config_id).first()
    if not host:
        raise HTTPException(status_code=404, detail="Host entry not found")
    return host


@router.put("/{config_id}/hosts/{host_id}", response_model=schemas.HostOut)
def update_host(config_id: int, host_id: int, body: schemas.HostUpdate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    host = db.query(models.Host).filter(models.Host.id == host_id, models.Host.config_id == config_id).first()
    if not host:
        raise HTTPException(status_code=404, detail="Host entry not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(host, field, value)
    db.commit()
    db.refresh(host)
    return host


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