import assert from 'node:assert';
import fs from 'node:fs';
import { test } from 'node:test';

// Behavioral tests for the welcome-vs-renewal classification (the exact
// decision invoice.paid makes), through the exported pure classifier.

const { classifySubscriptionEmail } = await import('../src/licenseLogic.js');

// Simulated invoice.paid behavior against progressively-delivered license
// state — no SMTP, no Stripe, no handler spin-up required; this is the same
// state machine deliverAndTrackLicenseEmail drives via updateLicense().
test('classification behavior across the real webhook order', () => {
  const uniq = `classify_${Date.now()}`;
  const license = {
    id: `lic_${uniq}`,
    key: 'DC-20F00-0000D-NB3FN-S6HXJ-A7CA0',
    customerId: `cus_${uniq}`,
    subscriptionId: `sub_${uniq}`,
    emailDeliveredAt: null
  };

  // State 1: license row exists (subscription.created already processed),
  // no email ever delivered -> invoice.paid must send the WELCOME email.
  assert.equal(classifySubscriptionEmail(license).extended, false,
    'pre-created license with zero delivered emails = welcome');

  // State 2: welcome email delivered (deliverAndTrackLicenseEmail sets this
  // via updateLicense after SMTP 250). Next invoice.paid = renewal.
  license.emailDeliveredAt = new Date().toISOString();
  assert.equal(classifySubscriptionEmail(license).extended, true,
    'license with a delivered email = extended/renewal');
});

test('classification survives missing/blank email state', () => {
  assert.equal(classifySubscriptionEmail(null).extended, false,
    'null license cannot have delivered mail -> welcome');
  assert.equal(classifySubscriptionEmail({}).extended, false,
    'missing field -> welcome');
  assert.equal(classifySubscriptionEmail({ emailDeliveredAt: '' }).extended, false,
    'blank timestamp -> welcome');
  assert.equal(classifySubscriptionEmail({ emailDeliveredAt: '2026-09-22T00:00:00.000Z' }).extended, true,
    'real timestamp -> extended');
});

// The server must call the classifier, not inline its own logic.
test('server.js delegates classification to classifySubscriptionEmail', () => {
  const src = fs.readFileSync(new URL('../src/server.js', import.meta.url), 'utf8');
  assert.ok(src.includes('classifySubscriptionEmail(license).extended'),
    'handler must use the shared classifier');
  assert.ok(!src.includes('Boolean(license.emailDeliveredAt)'),
    'no inline duplicate of the logic');
});