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* Composable for managing multilingual content and UI language
*/
import { ref, computed, watch } from 'vue'
import { useAuthStore } from '@/stores/auth'
import { useTenantsStore } from '@/stores/tenants'
import api from '@/services/api'
// User's preferred languages in order (cached in memory + localStorage fallback)
const userLanguagePreferences = ref<string[]>([])
const preferencesLoaded = ref(false)
const preferencesLoading = ref(false)
// Initialize from localStorage as fallback
Eif (typeof window !== 'undefined') {
const stored = localStorage.getItem('userLanguagePreferences')
Iif (stored) {
try {
const parsed = JSON.parse(stored)
if (Array.isArray(parsed)) {
userLanguagePreferences.value = parsed
}
} catch {
// Fallback: check for old single language preference
const oldStored = localStorage.getItem('userPreferredLanguage')
if (oldStored) {
userLanguagePreferences.value = [oldStored]
localStorage.removeItem('userPreferredLanguage')
}
}
} else {
// Migrate from old single language preference
const oldStored = localStorage.getItem('userPreferredLanguage')
Iif (oldStored) {
userLanguagePreferences.value = [oldStored]
localStorage.setItem('userLanguagePreferences', JSON.stringify([oldStored]))
localStorage.removeItem('userPreferredLanguage')
}
}
}
/**
* Load preferences from API
*/
async function loadPreferencesFromAPI(): Promise<void> {
Iif (preferencesLoading.value || preferencesLoaded.value) return
// Check if user is authenticated before calling API
const authStore = useAuthStore()
Iif (!authStore.user || !authStore.isAuthenticated) {
preferencesLoaded.value = true
return
}
try {
preferencesLoading.value = true
const response = await api.get('/v1/users/preferences')
Iif (response.data && Array.isArray(response.data.languagePreferences)) {
userLanguagePreferences.value = response.data.languagePreferences
preferencesLoaded.value = true
// Update localStorage cache
if (typeof window !== 'undefined') {
localStorage.setItem(
'userLanguagePreferences',
JSON.stringify(response.data.languagePreferences)
)
}
}
} catch (error) {
console.warn(
'Failed to load language preferences from API, using localStorage fallback:',
error
)
// Keep localStorage value as fallback
} finally {
preferencesLoading.value = false
}
}
/**
* Save preferences to API
*/
async function savePreferencesToAPI(preferences: string[]): Promise<void> {
// Check if user is authenticated before calling API
const authStore = useAuthStore()
if (!authStore.user || !authStore.isAuthenticated) {
// Just update localStorage if not authenticated
Eif (typeof window !== 'undefined') {
localStorage.setItem('userLanguagePreferences', JSON.stringify(preferences))
}
return
}
try {
await api.put('/v1/users/preferences', {
languagePreferences: preferences
})
// Update localStorage cache
Eif (typeof window !== 'undefined') {
localStorage.setItem('userLanguagePreferences', JSON.stringify(preferences))
}
} catch (error) {
console.error('Failed to save language preferences to API:', error)
// Still update localStorage as fallback
if (typeof window !== 'undefined') {
localStorage.setItem('userLanguagePreferences', JSON.stringify(preferences))
}
throw error
}
}
export function useLanguage() {
const authStore = useAuthStore()
const tenantsStore = useTenantsStore()
const activeTenant = computed(() => {
if (!authStore.currentTenant) return null
return tenantsStore.myTenants.find((t) => t.tenantId === authStore.currentTenant)
})
const defaultLanguage = computed(() => {
return activeTenant.value?.defaultLanguage || 'en'
})
const enabledLanguages = computed(() => {
return activeTenant.value?.enabledLanguages || ['en', 'fr']
})
// UI language: first user preference that is a supported UI language.
// Intentionally NOT filtered by enabledLanguages (tenant content config).
// The interface language (en/fr) is a user preference independent of tenant settings.
const preferredUILanguage = computed<string>(() => {
const SUPPORTED_UI_LANGUAGES = ['en', 'fr']
for (const pref of userLanguagePreferences.value) {
Eif (SUPPORTED_UI_LANGUAGES.includes(pref)) {
return pref
}
}
return 'en'
})
const activeLanguage = computed({
get: () => {
// Priority order for content language:
// 1. First user preferred language that is in entity's enabled languages
// 2. Entity's default language (fallback if no user preference matches)
// 3. First enabled language (safety fallback if defaultLanguage not in enabledLanguages)
// 4. 'en' as absolute fallback
// Try each user preferred language in order
for (const prefLang of userLanguagePreferences.value) {
Eif (enabledLanguages.value.includes(prefLang)) {
return prefLang
}
}
// Use entity's default language if available
Eif (enabledLanguages.value.includes(defaultLanguage.value)) {
return defaultLanguage.value
}
// Fallback to first enabled language or 'en'
return enabledLanguages.value[0] || 'en'
},
set: (lang: string) => {
Eif (enabledLanguages.value.includes(lang)) {
// Set as primary preference (move to front if exists, add if not)
const newPrefs = [lang, ...userLanguagePreferences.value.filter((l) => l !== lang)]
userLanguagePreferences.value = newPrefs
// Save to API (fire and forget)
savePreferencesToAPI(newPrefs).catch((err) =>
console.error('Failed to save language preference:', err)
)
}
}
})
/**
* Set full language preference order (saves to API and localStorage)
*/
async function setLanguagePreferences(preferences: string[]): Promise<void> {
// Filter to only valid language codes
const validPrefs = preferences.filter((lang) => typeof lang === 'string' && lang.length === 2)
userLanguagePreferences.value = validPrefs
// Save to API (with localStorage fallback)
await savePreferencesToAPI(validPrefs)
}
/**
* Get current language preference order
*/
function getLanguagePreferences(): string[] {
return [...userLanguagePreferences.value]
}
/**
* Load preferences from database on first use
*/
async function initializePreferences(): Promise<void> {
await loadPreferencesFromAPI()
}
// Watch for tenant changes to clean up invalid preferences
watch([enabledLanguages], () => {
// Keep preferences even if not currently enabled in this tenant
// User might switch tenants and want their preferences preserved
})
/**
* Get translation from multilingual value using preference order
*/
function getTranslation(
value: string | Record<string, string> | null | undefined,
lang?: string
): string {
if (!value) return ''
// If value is a simple string, return it
if (typeof value === 'string') {
return value
}
// If specific language requested, try it first
if (lang && value[lang]) {
return value[lang] || ''
}
// Try each preferred language in order
for (const prefLang of userLanguagePreferences.value) {
if (value[prefLang]) {
return value[prefLang] || ''
}
}
// Try default language
if (defaultLanguage.value && value[defaultLanguage.value]) {
return value[defaultLanguage.value] || ''
}
// Try English as last resort
Iif (value['en']) {
return value['en'] || ''
}
// Return first available translation
const firstKey = Object.keys(value)[0]
return firstKey ? value[firstKey] || '' : ''
}
/**
* Normalize value to multilingual object
*/
function normalizeValue(
value: string | Record<string, string> | null | undefined
): Record<string, string> {
if (!value) {
return {}
}
if (typeof value === 'string') {
return { [defaultLanguage.value]: value }
}
return value
}
/**
* Check if a multilingual value has content in a specific language
*/
function hasTranslation(
value: string | Record<string, string> | null | undefined,
lang: string
): boolean {
if (!value) return false
if (typeof value === 'string') return true
return !!value[lang]
}
/**
* Get flag emoji for language
*/
function getFlag(lang: string): string {
const flags: Record<string, string> = {
en: '🇬🇧',
fr: '🇫🇷'
}
return flags[lang] || lang.toUpperCase()
}
/**
* Get language name
*/
function getLanguageName(lang: string): string {
const names: Record<string, string> = {
en: 'English',
fr: 'Français'
}
return names[lang] || lang
}
/**
* Switch UI language
*/
function switchLanguage(lang: string) {
if (enabledLanguages.value.includes(lang)) {
activeLanguage.value = lang
}
}
return {
// State
activeLanguage,
defaultLanguage,
enabledLanguages,
preferredUILanguage,
preferencesLoading,
// Methods
getTranslation,
normalizeValue,
hasTranslation,
getFlag,
getLanguageName,
switchLanguage,
setLanguagePreferences,
getLanguagePreferences,
initializePreferences
}
}
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