55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
/**
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* Detect user's preferred language from their existing notes
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* Uses a single DB-level GROUP BY query — no note content is loaded
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*/
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import { auth } from '@/auth'
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import { prisma } from '@/lib/prisma'
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import { unstable_cache } from 'next/cache'
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import { SupportedLanguage } from './load-translations'
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const SUPPORTED_LANGUAGES = new Set(['en', 'fr', 'es', 'de', 'fa', 'it', 'pt', 'ru', 'zh', 'ja', 'ko', 'ar', 'hi', 'nl', 'pl'])
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const getCachedUserLanguage = unstable_cache(
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async (userId: string): Promise<SupportedLanguage> => {
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try {
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// Single aggregated query — no notes are fetched, only language counts
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const result = await prisma.note.groupBy({
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by: ['language'],
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where: {
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userId,
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language: { not: null }
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},
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_sum: { languageConfidence: true },
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_count: true,
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orderBy: { _sum: { languageConfidence: 'desc' } },
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take: 1,
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})
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if (result.length > 0 && result[0].language) {
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const topLanguage = result[0].language as SupportedLanguage
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if (SUPPORTED_LANGUAGES.has(topLanguage)) {
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return topLanguage
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}
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}
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return 'en'
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} catch (error) {
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console.error('Error detecting user language:', error)
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return 'en'
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}
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},
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['user-language'],
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{ tags: ['user-language'] }
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)
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export async function detectUserLanguage(): Promise<SupportedLanguage> {
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const session = await auth()
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if (!session?.user?.id) {
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return 'en'
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}
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return getCachedUserLanguage(session.user.id)
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}
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