import { test } from 'node:test';
import assert from 'node:assert/strict';
import { applyTestConfig } from './helpers/testConfig.js';
import {
  currencyMeta,
  isSupportedCurrency,
  resolveCurrency,
  resolveLocale,
} from '../src/domain/storeLocales.js';

test('language maps to its natural currency when the shop sells in it', () => {
  applyTestConfig();
  assert.equal(resolveLocale('pl').currency, 'PLN');
  assert.equal(resolveLocale('cs').currency, 'CZK');
  assert.equal(resolveLocale('de').currency, 'EUR');
});

test('unsupported natural currency falls back to EUR with a note', () => {
  applyTestConfig();
  const locale = resolveLocale('tr');
  assert.equal(locale.currency, 'EUR');
  assert.equal(locale.fallback, true);
  assert.equal(locale.reason, 'unsupported_currency');
  assert.equal(locale.naturalCurrency, 'TRY');
  assert.match(String(currencyMeta(locale, 'tr').currency_note), /TRY/);
});

test('an unknown language code falls back to EUR', () => {
  applyTestConfig();
  const locale = resolveLocale('xx');
  assert.equal(locale.currency, 'EUR');
  assert.equal(locale.reason, 'unknown_language');
});

test('no language at all is EUR without a fallback flag', () => {
  applyTestConfig();
  const locale = resolveLocale(null);
  assert.equal(locale.currency, 'EUR');
  assert.equal(locale.fallback, false);
});

test('an explicit supported currency override wins over the language', () => {
  applyTestConfig();
  assert.equal(resolveCurrency('pl', 'CZK').currency, 'CZK');
});

test('an unsupported currency override is ignored, language mapping applies', () => {
  applyTestConfig();
  assert.equal(resolveCurrency('pl', 'JPY').currency, 'PLN');
});

test('STORE_CURRENCIES drives what counts as supported', () => {
  applyTestConfig({ STORE_CURRENCIES: 'PLN,EUR' });
  assert.equal(isSupportedCurrency('CZK'), false);
  assert.equal(resolveLocale('cs').currency, 'EUR');
  assert.equal(resolveLocale('cs').fallback, true);
});

test('currencyMeta omits the fallback fields on a clean resolution', () => {
  applyTestConfig();
  const meta = currencyMeta(resolveLocale('pl'), 'pl');
  assert.deepEqual(meta, { currency: 'PLN' });
});