from sqlalchemy.orm import Session, joinedload, subqueryload
from typing import Optional, List
from .models import CalculationInput, CalculationResult, ChartDataPoint
from datetime import datetime


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


def list_all(db: Session, limit: int = 20, offset: int = 0, **filters) -> List[CalculationInput]:
    q = db.query(CalculationInput)
    if filters.get("timestamp_start") is not None:
        q = q.filter(CalculationInput.timestamp >= filters["timestamp_start"])
    if filters.get("timestamp_end") is not None:
        q = q.filter(CalculationInput.timestamp <= filters["timestamp_end"])
    return q.order_by(CalculationInput.created_at.desc()).limit(limit).offset(offset).all()


def count_all(db: Session, **filters) -> int:
    q = db.query(CalculationInput.id)
    if filters.get("timestamp_start") is not None:
        q = q.filter(CalculationInput.timestamp >= filters["timestamp_start"])
    if filters.get("timestamp_end") is not None:
        q = q.filter(CalculationInput.timestamp <= filters["timestamp_end"])
    return q.count()


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


def update(db: Session, entity_id: str, data: dict) -> Optional[CalculationInput]:
    obj = db.query(CalculationInput).filter(CalculationInput.id == entity_id).first()
    if obj is None:
        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 = db.query(CalculationInput).filter(CalculationInput.id == entity_id).first()
    if obj is None:
        return False
    db.delete(obj)
    return True


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