"""Invoice dataclass + state machine tests."""

from __future__ import annotations

from datetime import datetime, timedelta, timezone

from cardano_checkout.invoice import Invoice, InvoiceStatus


def _make() -> Invoice:
    return Invoice(
        id="inv_001",
        merchant_id="chromaticcraft",
        derivation_index=0,
        receive_address="addr1...",
        expected_lovelace=5_000_000,   # 5 ADA
        usd_amount=2.50,
    )


def test_defaults_are_pending_and_non_terminal() -> None:
    inv = _make()
    assert inv.status == InvoiceStatus.PENDING
    assert inv.is_terminal is False
    assert inv.ada_amount == 5.0


def test_terminal_states() -> None:
    for s in (InvoiceStatus.CONFIRMED, InvoiceStatus.EXPIRED, InvoiceStatus.CANCELLED):
        inv = _make()
        inv.status = s
        assert inv.is_terminal is True


def test_is_expired_honors_expires_at() -> None:
    past = datetime.now(timezone.utc) - timedelta(minutes=5)
    future = datetime.now(timezone.utc) + timedelta(minutes=5)

    inv = _make()
    inv.expires_at = past
    assert inv.is_expired() is True

    inv.expires_at = future
    assert inv.is_expired() is False

    # Confirmed invoices are never "expired" regardless of timestamp
    inv.expires_at = past
    inv.status = InvoiceStatus.CONFIRMED
    assert inv.is_expired() is False