from sqlalchemy.orm import Session, joinedload
from typing import Optional, List
from .models import Report


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


def list_all(
    db: Session,
    limit: int = 20,
    offset: int = 0,
    report_type: Optional[str] = None,
    generated_by_user_id: Optional[str] = None,
) -> List[Report]:
    q = db.query(Report)
    if report_type is not None:
        q = q.filter(Report.report_type == report_type)
    if generated_by_user_id is not None:
        q = q.filter(Report.generated_by_user_id == generated_by_user_id)
    return q.order_by(Report.created_at.desc()).limit(limit).offset(offset).all()


def count_all(
    db: Session,
    report_type: Optional[str] = None,
    generated_by_user_id: Optional[str] = None,
) -> int:
    q = db.query(Report.id)
    if report_type is not None:
        q = q.filter(Report.report_type == report_type)
    if generated_by_user_id is not None:
        q = q.filter(Report.generated_by_user_id == generated_by_user_id)
    return q.count()


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


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


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


def get_with_details(db: Session, entity_id: str) -> Optional[Report]:
    return (
        db.query(Report)
        .options(joinedload(Report.generated_by_user))
        .filter(Report.id == entity_id)
        .first()
    )