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75 lines
3.9 KiB
75 lines
3.9 KiB
from finance.models import Account, Payee, Category, CardStatement, InstallmentPlan, Transaction, SourceRecord |
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from .base import DomainError, identity, lock, money, save, write |
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def validate_category(kind, category): |
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if category is None: |
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return |
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expected = {"INCOME": "INCOME", "EXPENSE": "EXPENSE", "REFUND": "EXPENSE"}.get(kind) |
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if expected != category.kind: |
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raise DomainError("category_kind_mismatch") |
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def record(*, account_id, amount, posting_date, kind, description="", occurrence_date=None, |
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payee_id=None, category_id=None, statement_id=None, refund_of_id=None, |
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installment_plan_id=None, installment_number=None): |
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amount = money(amount) |
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account = lock(Account, account_id, active=True) |
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payee = lock(Payee, payee_id, active=True) if payee_id is not None else None |
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category = lock(Category, category_id, active=True) if category_id is not None else None |
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validate_category(kind, category) |
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statement = lock(CardStatement, statement_id) if statement_id is not None else None |
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if statement and (account.kind != "CREDIT_CARD" or statement.account_id != account.pk): |
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raise DomainError("statement_account_mismatch") |
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plan = lock(InstallmentPlan, installment_plan_id) if installment_plan_id is not None else None |
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if plan: |
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if kind != "EXPENSE" or plan.account_id != account.pk: |
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raise DomainError("installment_account_or_kind_mismatch") |
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if not isinstance(installment_number, int) or isinstance(installment_number, bool) or not 1 <= installment_number <= plan.total_installments: |
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raise DomainError("invalid_installment_number") |
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elif installment_number is not None: |
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raise DomainError("missing_installment_plan") |
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original = lock(Transaction, refund_of_id) if refund_of_id is not None else None |
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if original: |
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if kind != "REFUND" or original.kind != "EXPENSE" or original.account.currency != account.currency: |
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raise DomainError("invalid_refund_reference") |
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obj = Transaction(account=account, amount=amount, posting_date=posting_date, kind=kind, |
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description=description, occurrence_date=occurrence_date, payee=payee, |
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category=category, statement=statement, refund_of=original, |
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installment_plan=plan, installment_number=installment_number) |
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return save(obj) |
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@write("record_transaction") |
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def record_transaction(**kwargs): |
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return record(**kwargs), sorted(key.removesuffix("_id") for key in kwargs) |
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@write("annotate_transaction") |
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def annotate_transaction(*, transaction_id, **changes): |
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if not changes or set(changes) - {"description", "payee_id", "category_id"}: |
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raise DomainError("immutable_transaction") |
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# Reference rows precede transaction rows in every write path. This avoids |
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# a cycle with refund posting (category -> original transaction). |
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references = {} |
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for field, model in (("payee_id", Payee), ("category_id", Category)): |
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if field in changes: |
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value = changes[field] |
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references[field] = lock(model, value, active=True) if value is not None else None |
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obj = lock(Transaction, transaction_id) |
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if "description" in changes: |
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obj.description = changes["description"] |
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if "payee_id" in changes: |
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obj.payee = references["payee_id"] |
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if "category_id" in changes: |
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obj.category = references["category_id"] |
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validate_category(obj.kind, obj.category) |
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return save(obj), sorted(key.removesuffix("_id") for key in changes) |
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@write("attach_source") |
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def attach_source(*, transaction_id, document_hash, source_format, parser_version, item_locator): |
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obj = lock(Transaction, transaction_id) |
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source = save(SourceRecord(transaction=obj, document_hash=document_hash, source_format=source_format, |
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parser_version=parser_version, item_locator=item_locator)) |
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return source, ["transaction", "document_hash", "source_format", "parser_version", "item_locator"]
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