"""
Unit tests for the Stripe webhook dispatcher (app/billing/webhooks.py).

Covers the pure, DB-free surface:
  - _ts_to_dt timestamp conversion
  - _STRIPE_STATUS_MAP status normalization (the 'canceled'/'cancelled' trap)
  - handle_event dispatch: unknown types are a no-op; known types call the right
    handler; a handler that raises is swallowed (one bad event must not abort the
    rest of a delivery batch).

The individual _on_* handlers open a control_session and are covered separately
by integration tests against a live control DB (not included here — see
tests/README.md).
"""

from datetime import datetime

import app.billing.webhooks as wh


# ── _ts_to_dt ────────────────────────────────────────────────────────────────

def test_ts_to_dt_none_returns_none():
    assert wh._ts_to_dt(None) is None


def test_ts_to_dt_epoch():
    # 0 → 1970-01-01T00:00:00, naive (tzinfo stripped)
    dt = wh._ts_to_dt(0)
    assert dt == datetime(1970, 1, 1, 0, 0, 0)
    assert dt.tzinfo is None


def test_ts_to_dt_known_value():
    # 2021-01-01T00:00:00Z == 1609459200
    assert wh._ts_to_dt(1609459200) == datetime(2021, 1, 1, 0, 0, 0)


# ── _STRIPE_STATUS_MAP ───────────────────────────────────────────────────────

def test_status_map_both_cancel_spellings():
    # Stripe emits 'canceled' (one L); we must normalize to our 'cancelled'.
    assert wh._STRIPE_STATUS_MAP['canceled'] == 'cancelled'
    assert wh._STRIPE_STATUS_MAP['cancelled'] == 'cancelled'


def test_status_map_trial_and_pastdue():
    assert wh._STRIPE_STATUS_MAP['trialing'] == 'trial'
    assert wh._STRIPE_STATUS_MAP['past_due'] == 'past_due'
    assert wh._STRIPE_STATUS_MAP['unpaid'] == 'past_due'


# ── handle_event dispatch ────────────────────────────────────────────────────

def test_unknown_event_type_is_noop():
    # Should simply return without raising and without touching any handler.
    wh.handle_event({'type': 'ping.unhandled', 'data': {'object': {}}})


def test_known_event_dispatches_to_handler(monkeypatch):
    called = {}

    def fake_handler(obj):
        called['obj'] = obj

    monkeypatch.setattr(wh, '_on_payment_failed', fake_handler)

    payload = {'customer': 'cus_123'}
    wh.handle_event({'type': 'invoice.payment_failed', 'data': {'object': payload}})

    assert called.get('obj') == payload


def test_handler_exception_is_swallowed(monkeypatch):
    def boom(obj):
        raise RuntimeError('stripe handler blew up')

    monkeypatch.setattr(wh, '_on_subscription_deleted', boom)

    # Must NOT propagate — a single malformed event cannot abort the batch.
    wh.handle_event({'type': 'customer.subscription.deleted', 'data': {'object': {}}})