import assert from 'node:assert/strict'
import test from 'node:test'
import { SEO_LABELS, formatSeoLabel, pickLabels } from '../app/utils/labels.ts'

test('labels: en and pl carry every L8 key', () => {
  const keys = (o: object, prefix = ''): string[] =>
    Object.entries(o).flatMap(([k, v]) => (v && typeof v === 'object' ? keys(v, `${prefix}${k}.`) : [`${prefix}${k}`]))
  const want = [
    'breadcrumbs.label',
    'pagination.label',
    'pagination.previous',
    'pagination.next',
    'pagination.page',
    'sitemap.title',
    'sitemap.groupTitle',
    'sitemap.pageSuffix',
    'sitemap.all',
    'sitemap.empty',
    'sitemapLink',
    'links.newTab',
  ].sort()
  assert.deepEqual(keys(SEO_LABELS.en).sort(), want)
  assert.deepEqual(keys(SEO_LABELS.pl).sort(), want)
  assert.equal(SEO_LABELS.pl.breadcrumbs.label, 'Ścieżka nawigacji')
  assert.equal(SEO_LABELS.en.links.newTab, '(opens in a new tab)')
})

test('pickLabels: the resolve locale first, then html_lang, then en', () => {
  assert.equal(pickLabels('pl', 'en').pagination.next, 'Następna strona')
  assert.equal(pickLabels('pl-PL', '').pagination.next, 'Następna strona')
  assert.equal(pickLabels('', 'pl-PL').pagination.next, 'Następna strona')
  assert.equal(pickLabels('de', 'pl').pagination.next, 'Następna strona')
  assert.equal(pickLabels('de', 'fr').pagination.next, 'Next page')
  assert.equal(pickLabels(undefined, undefined).sitemap.title, 'Sitemap')
})

test('pickLabels: app overrides change a key, add a locale and fill gaps from en', () => {
  const overrides = { pl: { sitemap: { title: 'Spis stron' } }, de: { pagination: { next: 'Nächste Seite' } } }
  const pl = pickLabels('pl', '', overrides)
  assert.equal(pl.sitemap.title, 'Spis stron')
  assert.equal(pl.sitemap.empty, 'Nie ma jeszcze stron do wyświetlenia.')
  const de = pickLabels('de', '', overrides)
  assert.equal(de.pagination.next, 'Nächste Seite')
  assert.equal(de.pagination.previous, 'Previous page')
  assert.equal(SEO_LABELS.pl.sitemap.title, 'Mapa strony', 'the built-in dictionary is not mutated')
})

test('pickLabels: a non-string override value is ignored', () => {
  const l = pickLabels('en', '', { en: { sitemapLink: 42 as unknown as string, pagination: 'x' as unknown as object } })
  assert.equal(l.sitemapLink, 'Sitemap')
  assert.equal(l.pagination.label, 'Pagination')
})

test('formatSeoLabel: fills {name} placeholders and leaves unknown ones', () => {
  assert.equal(formatSeoLabel(SEO_LABELS.pl.sitemap.all, { group: 'Wpisy', count: 12 }), 'Wpisy: wszystkie (12)')
  assert.equal(formatSeoLabel('Page {page} of {pages}', { page: 2 }), 'Page 2 of {pages}')
})