mia-accounting/tests/test_site/lib.py

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# The Mia! Accounting Demonstration Website.
# Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/13
# Copyright (c) 2023 imacat.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The common library for the Mia! Accounting demonstration website.
"""
from __future__ import annotations
import datetime as dt
import typing as t
from abc import ABC, abstractmethod
from decimal import Decimal
from secrets import randbelow
import sqlalchemy as sa
from flask import Flask
from . import db
from .auth import User
class Accounts:
"""The shortcuts to the common accounts."""
CASH: str = "1111-001"
BANK: str = "1113-001"
RECEIVABLE: str = "1141-001"
MACHINERY: str = "1441-001"
PAYABLE: str = "2141-001"
SERVICE: str = "4611-001"
RENT_EXPENSE: str = "6252-001"
MEAL: str = "6272-001"
class JournalEntryLineItemData:
"""The journal entry line item data."""
def __init__(self, account: str, description: str | None, amount: str,
original_line_item: JournalEntryLineItemData | None = None):
"""Constructs the journal entry line item data.
:param account: The account code.
:param description: The description.
:param amount: The amount.
:param original_line_item: The original journal entry line item.
"""
self.journal_entry: JournalEntryData | None = None
self.id: int = -1
self.no: int = -1
self.original_line_item: JournalEntryLineItemData | None \
= original_line_item
self.account: str = account
self.description: str | None = description
self.amount: Decimal = Decimal(amount)
def form(self, prefix: str, debit_credit: str, index: int,
is_update: bool) -> dict[str, str]:
"""Returns the line item as form data.
:param prefix: The prefix of the form fields.
:param debit_credit: Either "debit" or "credit".
:param index: The line item index.
:param is_update: True for an update operation, or False otherwise
:return: The form data.
"""
prefix = f"{prefix}-{debit_credit}-{index}"
form: dict[str, str] = {f"{prefix}-account_code": self.account,
f"{prefix}-description": self.description,
f"{prefix}-amount": str(self.amount)}
if is_update and self.id != -1:
form[f"{prefix}-id"] = str(self.id)
form[f"{prefix}-no"] = str(index) if self.no == -1 else str(self.no)
if self.original_line_item is not None:
assert self.original_line_item.id != -1
form[f"{prefix}-original_line_item_id"] \
= str(self.original_line_item.id)
return form
class JournalEntryCurrencyData:
"""The journal entry currency data."""
def __init__(self, currency: str, debit: list[JournalEntryLineItemData],
credit: list[JournalEntryLineItemData]):
"""Constructs the journal entry currency data.
:param currency: The currency code.
:param debit: The debit line items.
:param credit: The credit line items.
"""
self.code: str = currency
self.debit: list[JournalEntryLineItemData] = debit
self.credit: list[JournalEntryLineItemData] = credit
def form(self, index: int, is_update: bool) -> dict[str, str]:
"""Returns the currency as form data.
:param index: The currency index.
:param is_update: True for an update operation, or False otherwise
:return: The form data.
"""
prefix: str = f"currency-{index}"
form: dict[str, str] = {f"{prefix}-code": self.code}
for i in range(len(self.debit)):
form.update(self.debit[i].form(prefix, "debit", i + 1, is_update))
for i in range(len(self.credit)):
form.update(self.credit[i].form(prefix, "credit", i + 1,
is_update))
return form
class JournalEntryData:
"""The journal entry data."""
def __init__(self, days: int, currencies: list[JournalEntryCurrencyData]):
"""Constructs a journal entry.
:param days: The number of days before today.
:param currencies: The journal entry currency data.
"""
self.id: int = -1
self.days: int = days
self.currencies: list[JournalEntryCurrencyData] = currencies
self.note: str | None = None
for currency in self.currencies:
for line_item in currency.debit:
line_item.journal_entry = self
for line_item in currency.credit:
line_item.journal_entry = self
def new_form(self, csrf_token: str, next_uri: str) -> dict[str, str]:
"""Returns the journal entry as a creation form.
:param csrf_token: The CSRF token.
:param next_uri: The next URI.
:return: The journal entry as a creation form.
"""
return self.__form(csrf_token, next_uri, is_update=False)
def update_form(self, csrf_token: str, next_uri: str) -> dict[str, str]:
"""Returns the journal entry as an update form.
:param csrf_token: The CSRF token.
:param next_uri: The next URI.
:return: The journal entry as an update form.
"""
return self.__form(csrf_token, next_uri, is_update=True)
def __form(self, csrf_token: str, next_uri: str, is_update: bool = False) \
-> dict[str, str]:
"""Returns the journal entry as a form.
:param csrf_token: The CSRF token.
:param next_uri: The next URI.
:param is_update: True for an update operation, or False otherwise
:return: The journal entry as a form.
"""
journal_entry_date: dt.date \
= dt.date.today() - dt.timedelta(days=self.days)
form: dict[str, str] = {"csrf_token": csrf_token,
"next": next_uri,
"date": journal_entry_date.isoformat()}
for i in range(len(self.currencies)):
form.update(self.currencies[i].form(i + 1, is_update))
if self.note is not None:
form["note"] = self.note
return form
class BaseTestData(ABC):
"""The base test data."""
def __init__(self, app: Flask, username: str):
"""Constructs the test data.
:param app: The Flask application.
:param username: The username.
"""
self._app: Flask = app
with self._app.app_context():
current_user: User | None = User.query\
.filter(User.username == username).first()
assert current_user is not None
self.__current_user_id: int = current_user.id
self.__journal_entries: list[dict[str, t.Any]] = []
self.__line_items: list[dict[str, t.Any]] = []
self._init_data()
@abstractmethod
def _init_data(self) -> None:
"""Initializes the test data.
:return: None
"""
def populate(self) -> None:
"""Populates the data into the database.
:return: None
"""
from accounting.models import JournalEntry, JournalEntryLineItem
with self._app.app_context():
db.session.execute(sa.insert(JournalEntry), self.__journal_entries)
db.session.execute(sa.insert(JournalEntryLineItem),
self.__line_items)
db.session.commit()
@staticmethod
def _couple(description: str, amount: str, debit: str, credit: str) \
-> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
"""Returns a couple of debit-credit line items.
:param description: The description.
:param amount: The amount.
:param debit: The debit account code.
:param credit: The credit account code.
:return: The debit line item and credit line item.
"""
return JournalEntryLineItemData(debit, description, amount),\
JournalEntryLineItemData(credit, description, amount)
def _add_journal_entry(self, journal_entry_data: JournalEntryData) -> None:
"""Adds a journal entry.
:param journal_entry_data: The journal entry data.
:return: None.
"""
from accounting.models import Account
existing_j_id: set[int] = {x["id"] for x in self.__journal_entries}
existing_l_id: set[int] = {x["id"] for x in self.__line_items}
journal_entry_data.id = self.__new_id(existing_j_id)
date: dt.date \
= dt.date.today() - dt.timedelta(days=journal_entry_data.days)
self.__journal_entries.append(
{"id": journal_entry_data.id,
"date": date,
"no": self.__next_j_no(date),
"note": journal_entry_data.note,
"created_by_id": self.__current_user_id,
"updated_by_id": self.__current_user_id})
debit_no: int = 0
credit_no: int = 0
for currency in journal_entry_data.currencies:
for line_item in currency.debit:
account: Account | None \
= Account.find_by_code(line_item.account)
assert account is not None
debit_no = debit_no + 1
line_item.id = self.__new_id(existing_l_id)
data: dict[str, t.Any] \
= {"id": line_item.id,
"journal_entry_id": journal_entry_data.id,
"is_debit": True,
"no": debit_no,
"account_id": account.id,
"currency_code": currency.code,
"description": line_item.description,
"amount": line_item.amount}
if line_item.original_line_item is not None:
data["original_line_item_id"] \
= line_item.original_line_item.id
self.__line_items.append(data)
for line_item in currency.credit:
account: Account | None \
= Account.find_by_code(line_item.account)
assert account is not None
credit_no = credit_no + 1
line_item.id = self.__new_id(existing_l_id)
data: dict[str, t.Any] \
= {"id": line_item.id,
"journal_entry_id": journal_entry_data.id,
"is_debit": False,
"no": credit_no,
"account_id": account.id,
"currency_code": currency.code,
"description": line_item.description,
"amount": line_item.amount}
if line_item.original_line_item is not None:
data["original_line_item_id"] \
= line_item.original_line_item.id
self.__line_items.append(data)
@staticmethod
def __new_id(existing_id: set[int]) -> int:
"""Generates and returns a new random unique ID.
:param existing_id: The existing ID.
:return: The newly-generated random unique ID.
"""
while True:
obj_id: int = 100000000 + randbelow(900000000)
if obj_id not in existing_id:
existing_id.add(obj_id)
return obj_id
def __next_j_no(self, date: dt.date) -> int:
"""Returns the next journal entry number in a day.
:param date: The journal entry date.
:return: The next journal entry number.
"""
existing: set[int] = {x["no"] for x in self.__journal_entries
if x["date"] == date}
return 1 if len(existing) == 0 else max(existing) + 1
def _add_simple_journal_entry(
self, days: int, currency: str, description: str, amount: str,
debit: str, credit: str) \
-> tuple[JournalEntryLineItemData, JournalEntryLineItemData]:
"""Adds a simple journal entry.
:param days: The number of days before today.
:param currency: The currency code.
:param description: The description.
:param amount: The amount.
:param debit: The debit account code.
:param credit: The credit account code.
:return: The debit line item and credit line item.
"""
debit_item, credit_item = self._couple(
description, amount, debit, credit)
self._add_journal_entry(JournalEntryData(
days, [JournalEntryCurrencyData(
currency, [debit_item], [credit_item])]))
return debit_item, credit_item