dibbler/tests/models/test_transaction.py

from datetime import datetime

import pytest
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import Session

from dibbler.models import Product, Transaction, User
from dibbler.queries.product_stock import product_stock


def insert_test_data(sql_session: Session) -> tuple[User, Product]:
    user = User("Test User")
    product = Product("1234567890123", "Test Product")

    sql_session.add(user)
    sql_session.add(product)
    sql_session.commit()

    return user, product


def test_transaction_no_duplicate_timestamps(sql_session: Session):
    user, _ = insert_test_data(sql_session)

    transaction1 = Transaction.adjust_balance(
        time=datetime(2023, 10, 1, 12, 0, 0),
        user_id=user.id,
        amount=100,
    )

    sql_session.add(transaction1)
    sql_session.commit()

    transaction2 = Transaction.adjust_balance(
        time=transaction1.time,
        user_id=user.id,
        amount=-50,
    )

    sql_session.add(transaction2)

    with pytest.raises(IntegrityError):
        sql_session.commit()


def test_user_not_allowed_to_transfer_to_self(sql_session: Session) -> None:
    user, _ = insert_test_data(sql_session)

    transaction = Transaction.transfer(
        time=datetime(2023, 10, 1, 12, 0, 0),
        user_id=user.id,
        transfer_user_id=user.id,
        amount=50,
    )

    sql_session.add(transaction)

    with pytest.raises(IntegrityError):
        sql_session.commit()


def test_product_foreign_key_constraint(sql_session: Session) -> None:
    user, product = insert_test_data(sql_session)

    transaction = Transaction.add_product(
        time=datetime(2023, 10, 1, 12, 0, 0),
        user_id=user.id,
        product_id=product.id,
        amount=27,
        per_product=27,
        product_count=1,
    )

    sql_session.add(transaction)
    sql_session.commit()

    # Attempt to add a transaction with a non-existent product
    invalid_transaction = Transaction.add_product(
        time=datetime(2023, 10, 1, 12, 0, 1),
        user_id=user.id,
        product_id=9999,  # Non-existent product ID
        amount=27,
        per_product=27,
        product_count=1,
    )

    sql_session.add(invalid_transaction)

    with pytest.raises(IntegrityError):
        sql_session.commit()


def test_user_foreign_key_constraint(sql_session: Session) -> None:
    user, product = insert_test_data(sql_session)

    transaction = Transaction.add_product(
        time=datetime(2023, 10, 1, 12, 0, 0),
        user_id=user.id,
        product_id=product.id,
        amount=27,
        per_product=27,
        product_count=1,
    )

    sql_session.add(transaction)
    sql_session.commit()

    # Attempt to add a transaction with a non-existent user
    invalid_transaction = Transaction.add_product(
        time=datetime(2023, 10, 1, 12, 0, 1),
        user_id=9999,  # Non-existent user ID
        product_id=product.id,
        amount=27,
        per_product=27,
        product_count=1,
    )

    sql_session.add(invalid_transaction)

    with pytest.raises(IntegrityError):
        sql_session.commit()


def test_transaction_buy_product_more_than_stock(sql_session: Session) -> None:
    user, product = insert_test_data(sql_session)

    transactions = [
        Transaction.add_product(
            time=datetime(2023, 10, 1, 12, 0, 0),
            user_id=user.id,
            product_id=product.id,
            amount=27,
            per_product=27,
            product_count=1,
        ),
        Transaction.buy_product(
            time=datetime(2023, 10, 1, 13, 0, 0),
            product_count=10,
            user_id=user.id,
            product_id=product.id,
        ),
    ]

    sql_session.add_all(transactions)
    sql_session.commit()

    assert product_stock(sql_session, product) == 1 - 10


def test_transaction_buy_product_dont_allow_no_add_product_transactions(
    sql_session: Session,
) -> None:
    user, product = insert_test_data(sql_session)

    transaction = Transaction.buy_product(
        time=datetime(2023, 10, 1, 12, 0, 0),
        product_count=1,
        user_id=user.id,
        product_id=product.id,
    )

    sql_session.add(transaction)

    with pytest.raises(ValueError):
        sql_session.commit()


def test_transaction_add_product_deny_amount_over_per_product_times_product_count(
    sql_session: Session,
) -> None:
    user, product = insert_test_data(sql_session)

    with pytest.raises(ValueError):
        _transaction = Transaction.add_product(
            time=datetime(2023, 10, 1, 12, 0, 0),
            user_id=user.id,
            product_id=product.id,
            amount=27 * 2 + 1,  # Invalid amount
            per_product=27,
            product_count=2,
        )


def test_transaction_add_product_allow_amount_under_per_product_times_product_count(
    sql_session: Session,
) -> None:
    user, product = insert_test_data(sql_session)

    transaction = Transaction.add_product(
        time=datetime(2023, 10, 1, 12, 0, 0),
        user_id=user.id,
        product_id=product.id,
        amount=27 * 2 - 1,  # Valid amount
        per_product=27,
        product_count=2,
    )

    sql_session.add(transaction)
    sql_session.commit()