518 lines
18 KiB
Python
518 lines
18 KiB
Python
# The core application of the Mia project.
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# by imacat <imacat@mail.imacat.idv.tw>, 2020/7/31
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# Copyright (c) 2020 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 forms of the Mia core application.
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"""
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import datetime
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import re
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from typing import Optional, List, Dict
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from django import forms
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from django.core.validators import RegexValidator
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from django.db.models import Q, Max
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from django.db.models.functions import Length
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from django.utils.translation import gettext as _
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from .models import Account, Record, Transaction
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from .validators import validate_record_account_code, validate_record_id
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class RecordForm(forms.Form):
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"""An accounting record form.
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Attributes:
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txn_form (TransactionForm): The parent transaction form.
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is_credit (bool): Whether this is a credit record.
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"""
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id = forms.IntegerField(
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required=False,
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error_messages={
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"invalid": _("This accounting record is not valid."),
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},
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validators=[validate_record_id])
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account = forms.CharField(
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error_messages={
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"required": _("Please select the account."),
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},
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validators=[validate_record_account_code])
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summary = forms.CharField(
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required=False,
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max_length=128,
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error_messages={
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"max_length": _("This summary is too long (max. 128 characters)."),
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})
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amount = forms.IntegerField(
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min_value=1,
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error_messages={
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"required": _("Please fill in the amount."),
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"invalid": _("Please fill in a number."),
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"min_value": _("The amount must be at least 1."),
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})
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.txn_form = None
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self.is_credit = None
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def account_title(self) -> Optional[str]:
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"""Returns the title of the specified account, if any.
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Returns:
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The title of the specified account, or None if the specified
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account is not available.
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"""
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try:
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return Account.objects.get(code=self["account"].value()).title
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except KeyError:
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return None
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except Account.DoesNotExist:
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return None
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def clean(self):
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"""Validates the form globally.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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errors = []
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if "id" in self.errors:
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errors = errors + self.errors["id"].as_data()
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validators = [self._validate_transaction,
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self._validate_account_type,
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self._validate_is_credit]
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for validator in validators:
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try:
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validator()
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except forms.ValidationError as e:
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errors.append(e)
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if errors:
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raise forms.ValidationError(errors)
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def _validate_transaction(self) -> None:
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"""Validates whether the transaction matches the transaction form.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "id" in self.errors:
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return
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if self.txn_form.transaction is None:
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if "id" in self.data:
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raise forms.ValidationError(
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_("This record is not for this transaction."),
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code="not_belong")
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else:
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if "id" in self.data:
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record = Record.objects.get(pk=self.data["id"])
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if record.transaction.pk != self.txn_form.transaction.pk:
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raise forms.ValidationError(
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_("This record is not for this transaction."),
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code="not_belong")
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def _validate_account_type(self) -> None:
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"""Validates whether the account is a correct debit or credit account.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "account" in self.errors:
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return
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if self.is_credit:
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if not re.match("^([123489]|7[1234])", self.data["account"]):
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error = forms.ValidationError(
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_("This account is not for credit records."),
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code="not_credit")
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self.add_error("account", error)
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raise error
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else:
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if not re.match("^([1235689]|7[5678])", self.data["account"]):
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error = forms.ValidationError(
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_("This account is not for debit records."),
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code="not_debit")
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self.add_error("account", error)
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raise error
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def _validate_is_credit(self) -> None:
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"""Validates whether debit and credit records are submitted correctly
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as corresponding debit and credit records.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "id" in self.errors:
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return
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if "id" not in self.data:
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return
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record = Record.objects.get(pk=self.data["id"])
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if record.is_credit != self.is_credit:
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if self.is_credit:
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raise forms.ValidationError(
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_("This accounting record is not a credit record."),
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code="not_credit")
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else:
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raise forms.ValidationError(
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_("This accounting record is not a debit record."),
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code="not_debit")
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class TransactionForm(forms.Form):
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"""A transaction form.
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Attributes:
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txn_type (str): The transaction type.
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transaction (Transaction|None): The current transaction or None
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debit_records (list[RecordForm]): The debit records.
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credit_records (list[RecordForm]): The credit records.
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"""
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date = forms.DateField(
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required=True,
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error_messages={
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"required": _("Please fill in the date."),
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"invalid": _("This date is not valid.")
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})
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notes = forms.CharField(
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required=False,
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max_length=128,
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error_messages={
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"max_length": _("These notes are too long (max. 128 characters).")
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})
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Populates the belonging record forms
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self.debit_records = []
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self.credit_records = []
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if len(args) > 0 and isinstance(args[0], dict):
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by_rec_id = {}
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for key in args[0].keys():
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m = re.match(
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("^((debit|credit)-([1-9][0-9]*))-"
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"(id|ord|account|summary|amount)$"),
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key)
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if m is None:
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continue
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rec_id = m.group(1)
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column = m.group(4)
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if rec_id not in by_rec_id:
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by_rec_id[rec_id] = {
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"is_credit": m.group(2) == "credit",
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"no": int(m.group(3)),
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"data": {},
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}
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by_rec_id[rec_id]["data"][column] = args[0][key]
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debit_data_list = [x for x in by_rec_id.values()
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if not x["is_credit"]]
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debit_data_list.sort(key=lambda x: x["no"])
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for x in debit_data_list:
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record_form = RecordForm(x["data"])
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record_form.txn_form = self
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record_form.is_credit = False
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self.debit_records.append(record_form)
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credit_data_list = [x for x in by_rec_id.values()
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if x["is_credit"]]
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credit_data_list.sort(key=lambda x: x["no"])
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for x in credit_data_list:
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record_form = RecordForm(x["data"])
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record_form.txn_form = self
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record_form.is_credit = True
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self.credit_records.append(record_form)
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self.txn_type = None
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self.transaction = None
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def clean(self):
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"""Validates the form globally.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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errors = []
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validators = [self._validate_has_debit_records,
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self._validate_has_credit_records,
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self._validate_balance]
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for validator in validators:
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try:
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validator()
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except forms.ValidationError as e:
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errors.append(e)
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if errors:
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raise forms.ValidationError(errors)
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def _validate_has_debit_records(self) -> None:
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"""Validates whether there is any debit record.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if self.txn_type == "income":
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return
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if len(self.debit_records) > 0:
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return
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if self.txn_type == "transfer":
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raise forms.ValidationError(
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_("Please fill in debit accounting records."),
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code="has_debit_records")
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raise forms.ValidationError(
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_("Please fill in accounting records."),
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code="has_debit_records")
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def _validate_has_credit_records(self) -> None:
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"""Validates whether there is any credit record.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if self.txn_type == "expense":
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return
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if len(self.credit_records) > 0:
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return
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if self.txn_type == "transfer":
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raise forms.ValidationError(
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_("Please fill in credit accounting records."),
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code="has_debit_records")
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raise forms.ValidationError(
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_("Please fill in accounting records."),
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code="has_debit_records")
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def _validate_balance(self) -> None:
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"""Validates whether the total amount of debit and credit records are
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consistent.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if self.txn_type != "transfer":
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return
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if self.debit_total() == self.credit_total():
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return
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raise forms.ValidationError(
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_("The total of the debit and credit amounts are inconsistent."),
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code="balance")
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def is_valid(self) -> bool:
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if not super().is_valid():
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return False
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for x in self.debit_records + self.credit_records:
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if not x.is_valid():
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return False
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return True
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def balance_error(self) -> Optional[str]:
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"""Returns the error message when the transaction is imbalanced.
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Returns:
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The error message when the transaction is imbalanced, or None
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otherwise.
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"""
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errors = [x for x in self.non_field_errors().data
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if x.code == "balance"]
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if errors:
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return errors[0].message
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return None
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def debit_total(self) -> int:
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"""Returns the total amount of the debit records.
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Returns:
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The total amount of the credit records.
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"""
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return sum([int(x.data["amount"]) for x in self.debit_records
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if "amount" in x.data and "amount" not in x.errors])
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def credit_total(self) -> int:
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"""Returns the total amount of the credit records.
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Returns:
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The total amount of the credit records.
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"""
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return sum([int(x.data["amount"]) for x in self.credit_records
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if "amount" in x.data and "amount" not in x.errors])
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class TransactionSortForm(forms.Form):
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"""A form to sort the transactions in a same day."""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.date = None
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self.txn_list: Optional[List[Transaction]] = None
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self.txn_orders: List[TransactionSortForm.Order] = []
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@staticmethod
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def from_post(date: datetime.date, post: Dict[str, str]):
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form = TransactionSortForm({})
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form.date = date
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post_orders: List[TransactionSortForm.Order] = []
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for txn in Transaction.objects.filter(date=date).all():
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key = F"transaction-{txn.pk}-ord"
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if key not in post:
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post_orders.append(form.Order(txn, 9999))
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elif not re.match("^[0-9]+$", post[key]):
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post_orders.append(form.Order(txn, 9999))
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else:
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post_orders.append(form.Order(txn, int(post[key])))
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post_orders.sort(key=lambda x: (x.order, x.txn.ord))
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form.txn_orders = []
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for i in range(len(post_orders)):
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form.txn_orders.append(form.Order(post_orders[i].txn, i + 1))
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form.txn_list = [x.txn for x in form.txn_orders]
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return form
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class Order:
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"""A transaction order"""
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def __init__(self, txn: Transaction, order: int):
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self.txn = txn
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self.order = order
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class AccountForm(forms.Form):
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"""An account form."""
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code = forms.CharField(
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error_messages={
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"required": _("Please fill in the code."),
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"invalid": _("Please fill in a number."),
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"max_length": _("This code is too long (max. 5)."),
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"min_value": _("This code is too long (max. 5)."),
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}, validators=[
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RegexValidator(
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regex="^[1-9]+$",
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message=_("You can only use numbers 1-9 in the code.")),
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])
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title = forms.CharField(
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max_length=128,
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error_messages={
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"required": _("Please fill in the title."),
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"max_length": _("This title is too long (max. 128)."),
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})
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.account = None
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@property
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def parent(self) -> Optional[Account]:
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"""The parent account, or None if this is the topmost account."""
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code = self["code"].value()
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if code is None or len(code) < 2:
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return None
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return Account.objects.get(code=code[:-1])
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def clean(self):
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"""Validates the form globally.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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errors = []
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validators = [self._validate_code_not_under_myself,
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self._validate_code_unique,
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self._validate_code_parent_exists,
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self._validate_code_descendant_code_size]
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for validator in validators:
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try:
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validator()
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except forms.ValidationError as e:
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errors.append(e)
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if errors:
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raise forms.ValidationError(errors)
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def _validate_code_not_under_myself(self) -> None:
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"""Validates whether the code is under itself.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if self.account is None:
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return
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if "code" not in self.data:
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return
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if self.data["code"] == self.account.code:
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return
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if not self.data["code"].startswith(self.account.code):
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return
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error = forms.ValidationError(
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_("You cannot set the code under itself."),
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code="not_under_myself")
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self.add_error("code", error)
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raise error
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def _validate_code_unique(self) -> None:
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"""Validates whether the code is unique.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "code" not in self.data:
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return
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try:
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if self.account is None:
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Account.objects.get(code=self.data["code"])
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else:
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Account.objects.get(Q(code=self.data["code"]),
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~Q(pk=self.account.pk))
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except Account.DoesNotExist:
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return
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error = forms.ValidationError(_("This code is already in use."),
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code="code_unique")
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self.add_error("code", error)
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raise error
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def _validate_code_parent_exists(self) -> None:
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"""Validates whether the parent account exists.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "code" not in self.data:
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return
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if len(self.data["code"]) < 2:
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return
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try:
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Account.objects.get(code=self.data["code"][:-1])
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except Account.DoesNotExist:
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error = forms.ValidationError(
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_("The parent account of this code does not exist."),
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code="code_unique")
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self.add_error("code", error)
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raise error
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return
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def _validate_code_descendant_code_size(self) -> None:
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"""Validates whether the codes of the descendants will be too long.
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Raises:
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forms.ValidationError: When the validation fails.
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"""
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if "code" not in self.data:
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return
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if self.account is None:
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return
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cur_max_len = Account.objects\
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.filter(Q(code__startswith=self.account.code),
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~Q(pk=self.account.pk))\
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.aggregate(max_len=Max(Length("code")))["max_len"]
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if cur_max_len is None:
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return
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new_max_len = cur_max_len - len(self.account.code)\
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+ len(self.data["code"])
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if new_max_len <= 5:
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return
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error = forms.ValidationError(
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_("The descendant account codes will be too long (max. 5)."),
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code="descendant_code_size")
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self.add_error("code", error)
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raise error
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