import pytest
from solution import BankAccount, InsufficientFunds


@pytest.fixture
def acc():
    return BankAccount("Ayşe", 100)


def test_init_strips_owner_and_sets_balance():
    a = BankAccount("  Ali ", 50, overdraft_limit=20)
    assert a.owner == "Ali" and a.balance == 50.0 and a.overdraft_limit == 20.0


@pytest.mark.parametrize("args", [("", 0), ("   ", 0), ("Ali", -1), ("Ali", 0, -5)])
def test_init_rejects_invalid(args):
    with pytest.raises(ValueError):
        BankAccount(*args)


def test_deposit_increases_balance(acc):
    assert acc.deposit(25) == 125
    assert acc.history == [("deposit", 25)]


@pytest.mark.parametrize("amount", [0, -10])
def test_deposit_rejects_non_positive(acc, amount):
    with pytest.raises(ValueError):
        acc.deposit(amount)


def test_withdraw_within_balance(acc):
    assert acc.withdraw(40) == 60


def test_withdraw_uses_overdraft_up_to_limit():
    a = BankAccount("Can", 10, overdraft_limit=50)
    assert a.withdraw(60) == -50


def test_withdraw_beyond_limit_raises():
    a = BankAccount("Can", 10, overdraft_limit=50)
    with pytest.raises(InsufficientFunds):
        a.withdraw(60.01)


def test_withdraw_rejects_non_positive(acc):
    with pytest.raises(ValueError):
        acc.withdraw(0)


def test_transfer_moves_money(acc):
    other = BankAccount("Veli")
    acc.transfer(other, 30)
    assert (acc.balance, other.balance) == (70, 30)


def test_transfer_to_self_rejected(acc):
    with pytest.raises(ValueError):
        acc.transfer(acc, 10)


def test_interest_on_positive_balance(acc):
    assert acc.apply_interest(0.1) == 110
    assert acc.history[-1] == ("interest", 10.0)


def test_no_interest_on_negative_balance():
    a = BankAccount("Can", 0, overdraft_limit=100)
    a.withdraw(50)
    assert a.apply_interest(0.5) == -50


@pytest.mark.parametrize("rate", [-0.1, 1.5])
def test_interest_rate_bounds(acc, rate):
    with pytest.raises(ValueError):
        acc.apply_interest(rate)


def test_statement_lists_history(acc):
    acc.deposit(5)
    acc.withdraw(10)
    text = acc.statement()
    assert text.splitlines()[0] == "Hesap sahibi: Ayşe"
    assert "withdraw -10.00" in text
    assert text.endswith("Bakiye: 95.00")