Renamed "voucher" to "journal entry".
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src/accounting/journal_entry/utils/description_editor.py
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261
src/accounting/journal_entry/utils/description_editor.py
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# The Mia! Accounting Flask Project.
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# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/27
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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 description editor.
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"""
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import typing as t
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import sqlalchemy as sa
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from accounting import db
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from accounting.models import Account, JournalEntryLineItem
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class DescriptionAccount:
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"""An account for a description tag."""
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def __init__(self, account: Account, freq: int):
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"""Constructs an account for a description tag.
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:param account: The account.
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:param freq: The frequency of the tag with 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.id: int = account.id
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"""The account ID."""
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self.code: str = account.code
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"""The account code."""
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self.freq: int = freq
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"""The frequency of the tag with the account."""
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def __str__(self) -> str:
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"""Returns the string representation of the account.
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:return: The string representation of the account.
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"""
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return str(self.account)
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def add_freq(self, freq: int) -> None:
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"""Adds the frequency of an account.
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:param freq: The frequency of the tag name with the account.
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:return: None.
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"""
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self.freq = self.freq + freq
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class DescriptionTag:
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"""A description tag."""
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def __init__(self, name: str):
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"""Constructs a description tag.
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:param name: The tag name.
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"""
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self.name: str = name
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"""The tag name."""
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self.__account_dict: dict[int, DescriptionAccount] = {}
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"""The accounts that come with the tag, in the order of their
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frequency."""
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self.freq: int = 0
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"""The frequency of the tag."""
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def __str__(self) -> str:
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"""Returns the string representation of the tag.
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:return: The string representation of the tag.
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"""
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return self.name
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def add_account(self, account: Account, freq: int):
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"""Adds an account.
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:param account: The associated account.
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:param freq: The frequency of the tag name with the account.
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:return: None.
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"""
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self.__account_dict[account.id] = DescriptionAccount(account, freq)
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self.freq = self.freq + freq
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@property
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def accounts(self) -> list[DescriptionAccount]:
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"""Returns the accounts by the order of their frequencies.
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:return: The accounts by the order of their frequencies.
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"""
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return sorted(self.__account_dict.values(), key=lambda x: -x.freq)
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@property
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def account_codes(self) -> list[str]:
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"""Returns the account codes by the order of their frequencies.
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:return: The account codes by the order of their frequencies.
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"""
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return [x.code for x in self.accounts]
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class DescriptionType:
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"""A description type"""
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def __init__(self, type_id: t.Literal["general", "travel", "bus"]):
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"""Constructs a description type.
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:param type_id: The type ID, either "general", "travel", or "bus".
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"""
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self.id: t.Literal["general", "travel", "bus"] = type_id
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"""The type ID."""
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self.__tag_dict: dict[str, DescriptionTag] = {}
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"""A dictionary from the tag name to their corresponding tag."""
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def add_tag(self, name: str, account: Account, freq: int) -> None:
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"""Adds a tag.
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:param name: The tag name.
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:param account: The associated account.
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:param freq: The frequency of the tag name with the account.
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:return: None.
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"""
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if name not in self.__tag_dict:
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self.__tag_dict[name] = DescriptionTag(name)
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self.__tag_dict[name].add_account(account, freq)
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@property
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def tags(self) -> list[DescriptionTag]:
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"""Returns the tags by the order of their frequencies.
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:return: The tags by the order of their frequencies.
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"""
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return sorted(self.__tag_dict.values(), key=lambda x: -x.freq)
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class DescriptionDebitCredit:
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"""The description on debit or credit."""
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def __init__(self, debit_credit: t.Literal["debit", "credit"]):
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"""Constructs the description on debit or credit.
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:param debit_credit: Either "debit" or "credit".
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"""
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self.debit_credit: t.Literal["debit", "credit"] = debit_credit
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"""Either debit or credit."""
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self.general: DescriptionType = DescriptionType("general")
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"""The general tags."""
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self.travel: DescriptionType = DescriptionType("travel")
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"""The travel tags."""
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self.bus: DescriptionType = DescriptionType("bus")
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"""The bus tags."""
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self.__type_dict: dict[t.Literal["general", "travel", "bus"],
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DescriptionType] \
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= {x.id: x for x in {self.general, self.travel, self.bus}}
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"""A dictionary from the type ID to the corresponding tags."""
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def add_tag(self, tag_type: t.Literal["general", "travel", "bus"],
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name: str, account: Account, freq: int) -> None:
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"""Adds a tag.
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:param tag_type: The tag type, either "general", "travel", or "bus".
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:param name: The name.
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:param account: The associated account.
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:param freq: The frequency of the tag name with the account.
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:return: None.
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"""
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self.__type_dict[tag_type].add_tag(name, account, freq)
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@property
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def accounts(self) -> list[DescriptionAccount]:
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"""Returns the suggested accounts of all tags in the description editor
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in debit or credit, in their frequency order.
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:return: The suggested accounts of all tags, in their frequency order.
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"""
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accounts: dict[int, DescriptionAccount] = {}
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freq: dict[int, int] = {}
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for tag_type in self.__type_dict.values():
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for tag in tag_type.tags:
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for account in tag.accounts:
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accounts[account.id] = account
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if account.id not in freq:
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freq[account.id] = 0
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freq[account.id] \
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= freq[account.id] + account.freq
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return [accounts[y] for y in sorted(freq.keys(),
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key=lambda x: -freq[x])]
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class DescriptionEditor:
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"""The description editor."""
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def __init__(self):
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"""Constructs the description editor."""
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self.debit: DescriptionDebitCredit = DescriptionDebitCredit("debit")
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"""The debit tags."""
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self.credit: DescriptionDebitCredit = DescriptionDebitCredit("credit")
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"""The credit tags."""
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debit_credit: sa.Label = sa.case(
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(JournalEntryLineItem.is_debit, "debit"),
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else_="credit").label("debit_credit")
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tag_type: sa.Label = sa.case(
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(JournalEntryLineItem.description.like("_%—_%—_%→_%"), "bus"),
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(sa.or_(JournalEntryLineItem.description.like("_%—_%→_%"),
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JournalEntryLineItem.description.like("_%—_%↔_%")),
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"travel"),
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else_="general").label("tag_type")
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tag: sa.Label = get_prefix(JournalEntryLineItem.description, "—")\
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.label("tag")
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select: sa.Select = sa.Select(debit_credit, tag_type, tag,
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JournalEntryLineItem.account_id,
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sa.func.count().label("freq"))\
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.filter(JournalEntryLineItem.description.is_not(None),
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JournalEntryLineItem.description.like("_%—_%"),
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JournalEntryLineItem.original_line_item_id.is_(None))\
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.group_by(debit_credit, tag_type, tag,
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JournalEntryLineItem.account_id)
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result: list[sa.Row] = db.session.execute(select).all()
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accounts: dict[int, Account] \
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= {x.id: x for x in Account.query
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.filter(Account.id.in_({x.account_id for x in result})).all()}
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debit_credit_dict: dict[t.Literal["debit", "credit"],
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DescriptionDebitCredit] \
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= {x.debit_credit: x for x in {self.debit, self.credit}}
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for row in result:
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debit_credit_dict[row.debit_credit].add_tag(
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row.tag_type, row.tag, accounts[row.account_id], row.freq)
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def get_prefix(string: str | sa.Column, separator: str | sa.Column) \
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-> sa.Function:
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"""Returns the SQL function to find the prefix of a string.
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:param string: The string.
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:param separator: The separator.
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:return: The position of the substring, starting from 1.
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"""
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return sa.func.substr(string, 0, get_position(string, separator))
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def get_position(string: str | sa.Column, substring: str | sa.Column) \
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-> sa.Function:
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"""Returns the SQL function to find the position of a substring.
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:param string: The string.
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:param substring: The substring.
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:return: The position of the substring, starting from 1.
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"""
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if db.engine.name == "postgresql":
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return sa.func.strpos(string, substring)
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return sa.func.instr(string, substring)
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