brewman/brewman/brewman/routers/reports/trial_balance.py

from datetime import date, datetime

import brewman.schemas.reports as schemas

from fastapi import APIRouter, Depends, Request, Security
from sqlalchemy.orm import Session
from sqlalchemy.sql.expression import func

from ...core.security import get_current_active_user as get_user
from ...core.session import get_finish_date, get_start_date, set_period
from ...db.session import SessionLocal
from ...models.master import AccountBase
from ...models.voucher import Journal, Voucher, VoucherType
from ...schemas.auth import UserToken


router = APIRouter()


# Dependency
def get_db() -> Session:
    try:
        db = SessionLocal()
        yield db
    finally:
        db.close()


@router.get("", response_model=schemas.TrialBalance)
def report_blank(
    request: Request,
    user: UserToken = Security(get_user, scopes=["trial-balance"]),
):
    return {"date": get_finish_date(request.session), "body": []}


@router.get("/{date_}", response_model=schemas.TrialBalance)
def report_data(
    date_: str,
    request: Request,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["trial-balance"]),
):
    set_period(get_start_date(request.session), date_, request.session)
    return {
        "date": date_,
        "body": build_report(datetime.strptime(date_, "%d-%b-%Y"), db),
    }


def build_report(date_: date, db: Session):
    amount_sum = func.sum(Journal.amount * Journal.debit).label("amount")
    query = (
        db.query(AccountBase, amount_sum)
        .join(Journal.voucher)
        .join(Journal.account)
        .filter(Voucher.date <= date_)
        .filter(Voucher.type != VoucherType.by_name("Issue").id)
        .group_by(AccountBase)
        .order_by(AccountBase.type)
        .order_by(func.abs(amount_sum).desc())
        .all()
    )

    body = []
    for account, amount in query:
        if amount != 0:
            tag = "debit" if amount > 0 else "credit"
            body.append(
                {"type": account.type_object.name, "name": account.name, tag: amount}
            )
    return body