import { describe, expect, it } from 'vitest'

import {
  getMessageDisplayText,
  normalizeLanguageCode,
} from './getMessageDisplayText'

describe('getMessageDisplayText', () => {
  it('returns translated text for the viewer language', () => {
    expect(
      getMessageDisplayText({
        message: {
          text: 'Bonjour',
          i18n: {
            language: 'fr',
            en_text: 'Hello',
          },
        },
        viewerLanguage: 'en-US',
      })
    ).toBe('Hello')
  })

  it('falls back to the original message text when no translation exists', () => {
    expect(
      getMessageDisplayText({
        message: {
          text: 'Bonjour',
          i18n: {
            language: 'fr',
          },
        },
        viewerLanguage: 'es',
      })
    ).toBe('Bonjour')
  })
})

describe('normalizeLanguageCode', () => {
  it('normalizes locale-style language codes to their primary subtag', () => {
    expect(normalizeLanguageCode('fr-FR')).toBe('fr')
    expect(normalizeLanguageCode('en_US')).toBe('en')
  })
})