from unittest.mock import patch
import pytest
from banking import BankAccount


@pytest.mark.parametrize("amount, expected", [
    (1, 100_001),
    (99_999, 199_999),
    (100_000, 200_000),
    (100_001, 200_001),
])
def test_deposit_bva(account, amount, expected):
    assert account.deposit(amount) == expected


def test_deposit_zero_raises(account):
    with pytest.raises(ValueError, match="Deposit must be positive"):
        account.deposit(0)


def test_deposit_negative_raises(account):
    with pytest.raises(ValueError, match="Deposit must be positive"):
        account.deposit(-1)


@pytest.mark.parametrize("amount, expected", [
    (1, 99_999),
    (99_999, 1),
    (100_000, 0),
])
def test_withdraw_valid_boundaries(account, amount, expected):
    assert account.withdraw(amount) == expected


def test_withdraw_zero_raises(account):
    with pytest.raises(ValueError, match="Withdrawal must be positive"):
        account.withdraw(0)


def test_withdraw_over_balance_raises(account):
    with pytest.raises(ValueError, match="Insufficient funds"):
        account.withdraw(100_001)
    assert account.balance == 100_000


def test_transfer_and_notification_mock(account):
    recipient = BankAccount("Bob", 10_000)
    with patch("banking.send_notification") as mocked:
        assert account.transfer(recipient, 40_000) == 60_000
        assert recipient.balance == 50_000
        mocked.assert_called_once_with("Bob", "Received 40000 from Alice")


def test_transfer_insufficient_funds_does_not_notify(account):
    recipient = BankAccount("Bob")
    with patch("banking.send_notification") as mocked:
        with pytest.raises(ValueError, match="Insufficient funds"):
            account.transfer(recipient, 100_001)
        mocked.assert_not_called()
        assert account.balance == 100_000
        assert recipient.balance == 0


def test_transfer_zero_raises(account):
    with pytest.raises(ValueError, match="Transfer must be positive"):
        account.transfer(BankAccount("Bob"), 0)


def test_transfer_to_self_raises(account):
    with pytest.raises(ValueError, match="Cannot transfer to the same account"):
        account.transfer(account, 100)


def test_blank_owner_raises():
    with pytest.raises(ValueError, match="Owner is required"):
        BankAccount("  ")


def test_negative_initial_balance_raises():
    with pytest.raises(ValueError, match="Initial balance cannot be negative"):
        BankAccount("Alice", -1)