import assert from 'node:assert/strict';
import test from 'node:test';

import {
  createCanaryPolicy,
  describeCanaryMatch,
  resolveCanaryTarget,
} from './canary-routing.mjs';

const policy = createCanaryPolicy({
  usernames: ['john'],
  wechatUserIds: ['wx_ul610et8'],
});

test('canary routes the configured john identity to candidate', () => {
  assert.equal(resolveCanaryTarget({ id: 'a6fb1e97', username: 'john' }, policy), 'candidate');
});

test('canary routes the exact 唐 WeChat identity by immutable user id', () => {
  assert.equal(
    resolveCanaryTarget({ id: 'a70ff537', displayName: '唐', wechatUserId: 'wx_ul610et8' }, policy),
    'candidate',
  );
});

test('same nickname without the configured immutable identity stays on stable', () => {
  assert.equal(
    resolveCanaryTarget({ id: 'other-user', displayName: '唐', wechatUserId: 'wx_other' }, policy),
    'stable',
  );
});

test('unrecognized, missing, and malformed identities fail closed to stable', () => {
  for (const identity of [null, {}, { username: 'admin' }, { id: 'wx_ul610et8' }]) {
    assert.equal(resolveCanaryTarget(identity, policy), 'stable');
  }
});

test('match description never exposes display-name routing', () => {
  const result = describeCanaryMatch({ id: 'other', displayName: '唐' }, policy);
  assert.equal(result.target, 'stable');
  assert.equal(result.matched, false);
  assert.equal(result.identity.username, '');
});