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}/rules", response_model=list[schemas.RuleOut])
def list_rules(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.Rule).filter(models.Rule.config_id == config_id).order_by(models.Rule.position).all()


@router.post("/{config_id}/rules", response_model=schemas.RuleOut, status_code=201)
def create_rule(config_id: int, body: schemas.RuleCreate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    rule = models.Rule(**body.model_dump(), config_id=config_id)
    db.add(rule)
    db.commit()
    db.refresh(rule)
    return rule


@router.get("/{config_id}/rules/{rule_id}", response_model=schemas.RuleOut)
def get_rule(config_id: int, rule_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    rule = db.query(models.Rule).filter(models.Rule.id == rule_id, models.Rule.config_id == config_id).first()
    if not rule:
        raise HTTPException(status_code=404, detail="Rule not found")
    return rule


@router.put("/{config_id}/rules/{rule_id}", response_model=schemas.RuleOut)
def update_rule(config_id: int, rule_id: int, body: schemas.RuleUpdate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    rule = db.query(models.Rule).filter(models.Rule.id == rule_id, models.Rule.config_id == config_id).first()
    if not rule:
        raise HTTPException(status_code=404, detail="Rule not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(rule, field, value)
    db.commit()
    db.refresh(rule)
    return rule


@router.delete("/{config_id}/rules/{rule_id}", status_code=204)
def delete_rule(config_id: int, rule_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
    _owner_config(config_id, db, user)
    rule = db.query(models.Rule).filter(models.Rule.id == rule_id, models.Rule.config_id == config_id).first()
    if not rule:
        raise HTTPException(status_code=404, detail="Rule not found")
    db.delete(rule)
    db.commit()