from sqlalchemy.orm import Session
from typing import Optional, List
from .models import Department


def get_by_id(db: Session, entity_id: str) -> Optional[Department]:
    return db.query(Department).filter(Department.id == entity_id).first()


def list_all(db: Session, limit: int = 20, offset: int = 0, **filters) -> List[Department]:
    q = db.query(Department)
    if filters.get("search"):
        search = f"%{filters['search']}%"
        q = q.filter(Department.name.ilike(search))
    return q.order_by(Department.created_at.desc()).limit(limit).offset(offset).all()


def count_all(db: Session, **filters) -> int:
    q = db.query(Department.id)
    if filters.get("search"):
        search = f"%{filters['search']}%"
        q = q.filter(Department.name.ilike(search))
    return q.count()


def create(db: Session, data: dict) -> Department:
    department = Department(**data)
    db.add(department)
    db.flush()
    return department


def update(db: Session, entity_id: str, data: dict) -> Optional[Department]:
    department = get_by_id(db, entity_id)
    if not department:
        return None
    for key, value in data.items():
        setattr(department, key, value)
    db.flush()
    return department


def delete(db: Session, entity_id: str) -> bool:
    department = get_by_id(db, entity_id)
    if not department:
        return False
    db.delete(department)
    db.flush()
    return True