92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
# DrCr: Web-based double-entry bookkeeping framework
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# Copyright (C) 2022 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from . import AMOUNT_DPS
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class Transaction:
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def __init__(self, dt=None, description=None, postings=None):
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self.dt = dt
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self.description = description
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self.postings = postings or []
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def assert_valid(self):
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"""Assert that debits equal credits, and commodities are compatible"""
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if any(p.commodity != '$' for p in self.postings):
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# FIXME: Allow non-$ commodities
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raise AssertionError('Transaction contains multiple commodities')
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if sum(p.quantity for p in self.postings) != 0:
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raise AssertionError('Transaction debits and credits do not balance')
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class Posting:
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def __init__(self, description=None, account=None, quantity=None, commodity=None):
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self.description = description
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self.account = account
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self.quantity = quantity
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self.commodity = commodity
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def amount(self):
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return Amount(self.quantity, self.commodity)
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class Amount:
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__slots__ = ['quantity', 'commodity']
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def __init__(self, quantity, commodity):
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self.quantity = quantity
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self.commodity = commodity
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def __abs__(self):
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return Amount(abs(self.quantity), self.commodity)
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def format(self):
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return '{0}{1:,.{dps}f}'.format(self.commodity, self.quantity / (10**AMOUNT_DPS), dps=AMOUNT_DPS)
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def quantity_string(self):
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return '{:.{dps}f}'.format(self.quantity / (10**AMOUNT_DPS), dps=AMOUNT_DPS)
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class TrialBalancer:
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"""
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Applies transactions to generate a trial balance
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"""
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def __init__(self):
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self.accounts = {}
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def apply_transactions(self, transactions):
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for transaction in transactions:
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for posting in transaction.postings:
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if posting.account not in self.accounts:
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self.accounts[posting.account] = Amount(0, '$') # FIXME: Other commodities
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# FIXME: Handle commodities
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self.accounts[posting.account].quantity += posting.quantity
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def transfer_balance(self, source_account, destination_account, description=None):
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"""Transfer the balance of the source account to the destination account"""
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# TODO: Keep a record of internal transactions?
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if source_account not in self.accounts:
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return
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if destination_account not in self.accounts:
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self.accounts[destination_account] = Amount(0, '$') # FIXME: Other commodities
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# FIXME: Handle commodities
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self.accounts[destination_account].quantity += self.accounts[source_account].quantity
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del self.accounts[source_account]
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