490 lines
19 KiB
Python
490 lines
19 KiB
Python
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# The Mia! Accounting Flask Project.
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# Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/4
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# Copyright (c) 2023 imacat.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The balance sheet.
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"""
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import csv
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import typing as t
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from decimal import Decimal
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from io import StringIO
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from urllib.parse import urlparse, ParseResult, parse_qsl, urlencode, \
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urlunparse
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import sqlalchemy as sa
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from flask import url_for, render_template, Response, request
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from accounting import db
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from accounting.models import Currency, BaseAccount, Account, Transaction, \
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JournalEntry
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from accounting.utils.txn_types import TransactionType
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from .option_link import OptionLink
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from .period import Period
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from .period_choosers import BalanceSheetPeriodChooser
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from .report_chooser import ReportChooser
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from .report_type import ReportType
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class BalanceSheetAccount:
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"""An account in the balance sheet."""
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def __init__(self, account: Account, amount: Decimal, url: str):
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"""Constructs an account in the balance sheet.
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:param account: The account.
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:param amount: The amount.
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:param url: The URL to the ledger of the account.
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"""
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self.account: Account = account
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"""The account."""
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self.amount: Decimal = amount
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"""The amount of the account."""
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self.url: str = url
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"""The URL to the ledger of the account."""
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class BalanceSheetSubsection:
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"""A subsection in the balance sheet."""
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def __init__(self, title: BaseAccount):
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"""Constructs a subsection in the balance sheet.
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:param title: The title account.
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"""
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self.title: BaseAccount = title
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"""The title account."""
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self.accounts: list[BalanceSheetAccount] = []
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"""The accounts in the subsection."""
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@property
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def total(self) -> Decimal:
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"""Returns the total of the subsection.
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:return: The total of the subsection.
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"""
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return sum([x.amount for x in self.accounts])
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class BalanceSheetSection:
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"""A section in the balance sheet."""
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def __init__(self, title: BaseAccount):
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"""Constructs a section in the balance sheet.
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:param title: The title account.
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"""
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self.title: BaseAccount = title
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"""The title account."""
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self.subsections: list[BalanceSheetSubsection] = []
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"""The subsections in the section."""
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@property
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def total(self) -> Decimal:
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"""Returns the total of the section.
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:return: The total of the section.
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"""
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return sum([x.total for x in self.subsections])
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class CSVHalfRow:
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"""A half row in the CSV balance sheet."""
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def __init__(self, title: str | None, amount: Decimal | None):
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"""The constructs a half row in the CSV balance sheet.
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:param title: The title.
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:param amount: The amount.
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"""
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self.title: str | None = title
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"""The title."""
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self.amount: Decimal | None = amount
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"""The amount."""
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class CSVRow:
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"""A row in the CSV balance sheet."""
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def __init__(self):
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"""Constructs a row in the CSV balance sheet."""
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self.asset_title: str | None = None
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"""The title of the asset."""
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self.asset_amount: Decimal | None = None
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"""The amount of the asset."""
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self.liability_title: str | None = None
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"""The title of the liability."""
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self.liability_amount: Decimal | None = None
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"""The amount of the liability."""
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@property
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def values(self) -> list[str | Decimal | None]:
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"""Returns the values of the row.
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:return: The values of the row.
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"""
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return [self.asset_title, self.asset_amount,
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self.liability_title, self.liability_amount]
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class BalanceSheetPageParams:
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"""The HTML parameters of the balance sheet."""
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def __init__(self, currency: Currency,
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period: Period,
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has_data: bool,
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assets: BalanceSheetSection,
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liabilities: BalanceSheetSection,
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owner_s_equity: BalanceSheetSection):
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"""Constructs the HTML parameters of the balance sheet.
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:param currency: The currency.
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:param period: The period.
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:param has_data: True if there is any data, or False otherwise.
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:param assets: The assets.
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:param liabilities: The liabilities.
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:param owner_s_equity: The owner's equity.
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"""
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self.currency: Currency = currency
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"""The currency."""
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self.period: Period = period
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"""The period."""
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self.has_data: bool = has_data
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"""True if there is any data, or False otherwise."""
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self.assets: BalanceSheetSection = assets
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"""The assets."""
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self.liabilities: BalanceSheetSection = liabilities
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"""The liabilities."""
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self.owner_s_equity: BalanceSheetSection = owner_s_equity
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"""The owner's equity."""
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self.period_chooser: BalanceSheetPeriodChooser \
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= BalanceSheetPeriodChooser(currency)
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"""The period chooser."""
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self.report_chooser: ReportChooser \
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= ReportChooser(ReportType.BALANCE_SHEET,
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currency=currency,
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period=period)
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"""The report chooser."""
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self.txn_types: t.Type[TransactionType] = TransactionType
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"""The transaction types."""
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@property
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def csv_uri(self) -> str:
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uri: str = request.full_path if request.query_string \
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else request.path
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uri_p: ParseResult = urlparse(uri)
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params: list[tuple[str, str]] = parse_qsl(uri_p.query)
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params = [x for x in params if x[0] != "as"]
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params.append(("as", "csv"))
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parts: list[str] = list(uri_p)
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parts[4] = urlencode(params)
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return urlunparse(parts)
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@property
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def currency_options(self) -> list[OptionLink]:
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"""Returns the currency options.
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:return: The currency options.
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"""
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def get_url(currency: Currency):
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if self.period.is_default:
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return url_for("accounting.report.balance-sheet-default",
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currency=currency)
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return url_for("accounting.report.balance-sheet",
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currency=currency, period=self.period)
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in_use: set[str] = set(db.session.scalars(
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sa.select(JournalEntry.currency_code)
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.group_by(JournalEntry.currency_code)).all())
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return [OptionLink(str(x), get_url(x), x.code == self.currency.code)
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for x in Currency.query.filter(Currency.code.in_(in_use))
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.order_by(Currency.code).all()]
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class BalanceSheet:
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"""The balance sheet."""
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def __init__(self, currency: Currency, period: Period):
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"""Constructs a balance sheet.
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:param currency: The currency.
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:param period: The period.
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"""
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self.currency: Currency = currency
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"""The currency."""
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self.period: Period = period
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"""The period."""
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self.__set_data()
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def __set_data(self) -> None:
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"""Queries and sets assets, the liabilities, and the owner's equity
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sections in the balance sheet.
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:return: The assets, the liabilities, and the owner's equity sections.
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"""
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balances: list[BalanceSheetAccount] = self.__query_balances()
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titles: list[BaseAccount] = BaseAccount.query\
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.filter(BaseAccount.code.in_({"1", "2", "3"})).all()
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subtitles: list[BaseAccount] = BaseAccount.query\
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.filter(BaseAccount.code.in_({x.account.base_code[:2]
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for x in balances})).all()
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sections: dict[str, BalanceSheetSection] \
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= {x.code: BalanceSheetSection(x) for x in titles}
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subsections: dict[str, BalanceSheetSubsection] \
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= {x.code: BalanceSheetSubsection(x) for x in subtitles}
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for subsection in subsections.values():
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sections[subsection.title.code[0]].subsections.append(subsection)
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for balance in balances:
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subsections[balance.account.base_code[:2]].accounts.append(balance)
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self.__has_data: bool = len(balances) > 0
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self.__assets: BalanceSheetSection = sections["1"]
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self.__liabilities: BalanceSheetSection = sections["2"]
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self.__owner_s_equity: BalanceSheetSection = sections["3"]
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def __query_balances(self) -> list[BalanceSheetAccount]:
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"""Queries and returns the balances.
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:return: The balances.
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"""
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sub_conditions: list[sa.BinaryExpression] \
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= [Account.base_code.startswith(x) for x in {"1", "2", "3"}]
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conditions: list[sa.BinaryExpression] \
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= [JournalEntry.currency_code == self.currency.code,
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sa.or_(*sub_conditions)]
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if self.period.end is not None:
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conditions.append(Transaction.date <= self.period.end)
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balance_func: sa.Function = sa.func.sum(sa.case(
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(JournalEntry.is_debit, JournalEntry.amount),
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else_=-JournalEntry.amount)).label("balance")
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select_balance: sa.Select \
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= sa.select(Account.id, Account.base_code, Account.no,
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balance_func)\
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.join(Transaction).join(Account)\
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.filter(*conditions)\
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.group_by(Account.id, Account.base_code, Account.no)\
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.order_by(Account.base_code, Account.no)
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account_balances: list[sa.Row] \
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= db.session.execute(select_balance).all()
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account_by_id: dict[int, Account] \
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= {x.id: x for x in Account.query
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.filter(sa.or_(Account.id.in_({x.id for x in account_balances}),
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Account.base_code == "3351",
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Account.base_code == "3353")).all()}
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def get_url(account: Account) -> str:
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"""Returns the ledger URL of an account.
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:param account: The account.
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:return: The ledger URL of the account.
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"""
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if self.period.is_default:
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return url_for("accounting.report.ledger-default",
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currency=self.currency, account=account)
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return url_for("accounting.report.ledger",
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currency=self.currency, account=account,
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period=self.period)
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balances: list[BalanceSheetAccount] \
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= [BalanceSheetAccount(account=account_by_id[x.id],
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amount=x.balance,
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url=get_url(account_by_id[x.id]))
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for x in account_balances]
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self.__add_accumulated(balances, list(account_by_id.values()))
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self.__add_current_period(balances, list(account_by_id.values()))
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for balance in balances:
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if not balance.account.base_code.startswith("1"):
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balance.amount = -balance.amount
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return balances
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def __add_accumulated(self, balances: list[BalanceSheetAccount],
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accounts: list[Account]) -> None:
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"""Adds the accumulated profit or loss to the balances.
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:param balances: The accounts on the balance sheet.
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:param accounts: The accounts.
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:return: None.
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"""
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code: str = "3351-001"
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amount: Decimal | None = self.__query_accumulated()
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url: str = url_for("accounting.report.income-statement",
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currency=self.currency, period=self.period.before)
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self.__add_owner_s_equity(balances, accounts, code, amount, url)
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def __query_accumulated(self) -> Decimal | None:
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"""Queries and returns the accumulated profit or loss.
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:return: The accumulated profit or loss.
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"""
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if self.period.start is None:
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return None
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conditions: list[sa.BinaryExpression] \
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= [JournalEntry.currency_code == self.currency.code,
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Transaction.date < self.period.start]
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conditions.extend([sa.not_(Account.base_code.startswith(x))
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for x in {"1", "2"}])
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balance_func: sa.Function = sa.func.sum(sa.case(
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(JournalEntry.is_debit, JournalEntry.amount),
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else_=-JournalEntry.amount)).label("balance")
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select_balance: sa.Select = sa.select(balance_func)\
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.join(Transaction).join(Account).filter(*conditions)
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return db.session.scalar(select_balance)
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def __add_current_period(self, balances: list[BalanceSheetAccount],
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accounts: list[Account]) -> None:
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"""Adds the accumulated profit or loss to the balances.
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:param balances: The accounts on the balance sheet.
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:param accounts: The accounts.
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:return: None.
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"""
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code: str = "3353-001"
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amount: Decimal | None = self.__query_currency_period()
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url: str = url_for("accounting.report.income-statement",
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currency=self.currency, period=self.period)
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self.__add_owner_s_equity(balances, accounts, code, amount, url)
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def __query_currency_period(self) -> Decimal | None:
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"""Queries and returns the net income or loss for current period.
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:return: The net income or loss for current period.
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"""
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conditions: list[sa.BinaryExpression] \
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= [JournalEntry.currency_code == self.currency.code]
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if self.period.start is not None:
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conditions.append(Transaction.date >= self.period.start)
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|
if self.period.end is not None:
|
||
|
|
conditions.append(Transaction.date <= self.period.end)
|
||
|
|
conditions.extend([sa.not_(Account.base_code.startswith(x))
|
||
|
|
for x in {"1", "2"}])
|
||
|
|
balance_func: sa.Function = sa.func.sum(sa.case(
|
||
|
|
(JournalEntry.is_debit, JournalEntry.amount),
|
||
|
|
else_=-JournalEntry.amount)).label("balance")
|
||
|
|
select_balance: sa.Select = sa.select(balance_func)\
|
||
|
|
.join(Transaction).join(Account).filter(*conditions)
|
||
|
|
return db.session.scalar(select_balance)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def __add_owner_s_equity(balances: list[BalanceSheetAccount],
|
||
|
|
accounts: list[Account],
|
||
|
|
code: str,
|
||
|
|
amount: Decimal | None,
|
||
|
|
url: str):
|
||
|
|
"""Adds an owner's equity balance.
|
||
|
|
|
||
|
|
:param balances: The accounts on the balance sheet.
|
||
|
|
:param accounts: The accounts.
|
||
|
|
:param code: The code of the account to add.
|
||
|
|
:param amount: The amount.
|
||
|
|
:return: None.
|
||
|
|
"""
|
||
|
|
# There is an existing balance.
|
||
|
|
balance_by_code: dict[str, BalanceSheetAccount] \
|
||
|
|
= {x.account.code: x for x in balances}
|
||
|
|
if code in balance_by_code:
|
||
|
|
balance: BalanceSheetAccount = balance_by_code[code]
|
||
|
|
balance.url = url
|
||
|
|
if amount is not None:
|
||
|
|
balance.amount = balance.amount + amount
|
||
|
|
return
|
||
|
|
# Add a new balance
|
||
|
|
if amount is None:
|
||
|
|
return
|
||
|
|
account_by_code: dict[str, Account] = {x.code: x for x in accounts}
|
||
|
|
balances.append(BalanceSheetAccount(
|
||
|
|
account=account_by_code[code],
|
||
|
|
amount=amount,
|
||
|
|
url=url))
|
||
|
|
|
||
|
|
def csv(self) -> Response:
|
||
|
|
"""Returns the report as CSV for download.
|
||
|
|
|
||
|
|
:return: The response of the report for download.
|
||
|
|
"""
|
||
|
|
filename: str = "balance-sheet-{currency}-{period}.csv"\
|
||
|
|
.format(currency=self.currency.code, period=self.period.spec)
|
||
|
|
rows: list[CSVRow] = self.__get_csv_rows()
|
||
|
|
with StringIO() as fp:
|
||
|
|
writer = csv.writer(fp)
|
||
|
|
writer.writerows([x.values for x in rows])
|
||
|
|
fp.seek(0)
|
||
|
|
response: Response = Response(fp.read(), mimetype="text/csv")
|
||
|
|
response.headers["Content-Disposition"] \
|
||
|
|
= f"attachment; filename={filename}"
|
||
|
|
return response
|
||
|
|
|
||
|
|
def __get_csv_rows(self) -> list[CSVRow]:
|
||
|
|
"""Composes and returns the CSV rows.
|
||
|
|
|
||
|
|
:return: The CSV rows.
|
||
|
|
"""
|
||
|
|
asset_rows: list[CSVHalfRow] = self.__section_csv_rows(self.__assets)
|
||
|
|
liability_rows: list[CSVHalfRow] = []
|
||
|
|
liability_rows.extend(self.__section_csv_rows(self.__liabilities))
|
||
|
|
liability_rows.append(CSVHalfRow("Total", self.__liabilities.total))
|
||
|
|
liability_rows.append(CSVHalfRow(None, None))
|
||
|
|
liability_rows.extend(self.__section_csv_rows(self.__owner_s_equity))
|
||
|
|
liability_rows.append(CSVHalfRow("Total", self.__owner_s_equity.total))
|
||
|
|
rows: list[CSVRow] = [CSVRow() for _ in
|
||
|
|
range(max(len(asset_rows), len(liability_rows)))]
|
||
|
|
for i in range(len(rows)):
|
||
|
|
if i < len(asset_rows):
|
||
|
|
rows[i].asset_title = asset_rows[i].title
|
||
|
|
rows[i].asset_amount = asset_rows[i].amount
|
||
|
|
if i < len(liability_rows) and liability_rows[i].title is not None:
|
||
|
|
rows[i].liability_title = liability_rows[i].title
|
||
|
|
rows[i].liability_amount = liability_rows[i].amount
|
||
|
|
total: CSVRow = CSVRow()
|
||
|
|
total.asset_title = "Total"
|
||
|
|
total.asset_amount = self.__assets.total
|
||
|
|
total.liability_title = "Total"
|
||
|
|
total.liability_amount \
|
||
|
|
= self.__liabilities.total + self.__owner_s_equity.total
|
||
|
|
rows.append(total)
|
||
|
|
return rows
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def __section_csv_rows(section: BalanceSheetSection) -> list[CSVHalfRow]:
|
||
|
|
"""Gathers the CSV rows for a section.
|
||
|
|
|
||
|
|
:param section: The section.
|
||
|
|
:return: The CSV rows for the section.
|
||
|
|
"""
|
||
|
|
rows: list[CSVHalfRow] \
|
||
|
|
= [CSVHalfRow(section.title.title.title(), None)]
|
||
|
|
for subsection in section.subsections:
|
||
|
|
rows.append(CSVHalfRow(f" {subsection.title.title.title()}", None))
|
||
|
|
for account in subsection.accounts:
|
||
|
|
rows.append(CSVHalfRow(f" {str(account.account).title()}",
|
||
|
|
account.amount))
|
||
|
|
return rows
|
||
|
|
|
||
|
|
def html(self) -> str:
|
||
|
|
"""Composes and returns the report as HTML.
|
||
|
|
|
||
|
|
:return: The report as HTML.
|
||
|
|
"""
|
||
|
|
params: BalanceSheetPageParams = BalanceSheetPageParams(
|
||
|
|
currency=self.currency,
|
||
|
|
period=self.period,
|
||
|
|
has_data=self.__has_data,
|
||
|
|
assets=self.__assets,
|
||
|
|
liabilities=self.__liabilities,
|
||
|
|
owner_s_equity=self.__owner_s_equity)
|
||
|
|
return render_template("accounting/report/balance-sheet.html",
|
||
|
|
report=params)
|