from datetime import date
from decimal import Decimal

import pytest

from finance.models import Account, Category, Tag, Transaction


pytestmark = pytest.mark.django_db


def test_ungrouped_categories_and_transaction_links_remain_valid():
    account = Account.objects.create(name="Synthetic bank", kind="BANK")
    category = Category.objects.create(name="Synthetic Food", kind="EXPENSE")
    transaction = Transaction.objects.create(
        account=account,
        amount=Decimal("-10.00"),
        posting_date=date(2026, 9, 14),
        kind="EXPENSE",
        category=category,
    )

    category.refresh_from_db()

    assert category.group_id is None
    assert transaction.category_id == category.pk


def test_tags_can_be_attached_without_changing_category():
    account = Account.objects.create(name="Synthetic bank", kind="BANK")
    transaction = Transaction.objects.create(
        account=account,
        amount=Decimal("-10.00"),
        posting_date=date(2026, 9, 14),
        kind="EXPENSE",
    )
    tag = Tag.objects.create(name="Synthetic Tax")

    transaction.tags.add(tag)

    assert list(transaction.tags.all()) == [tag]