import { readFile } from 'node:fs/promises'
import { resolve } from 'node:path'

const VALID_DOCS = ['imprint', 'privacy-policy']
const VALID_LOCALES = ['en', 'de']

export default defineEventHandler(async (event) => {
  const doc = getRouterParam(event, 'doc')
  const query = getQuery(event)
  const lang = typeof query.lang === 'string' && VALID_LOCALES.includes(query.lang)
    ? query.lang
    : 'en'

  if (!doc || !VALID_DOCS.includes(doc)) {
    throw createError({ statusCode: 404, message: `Unknown legal document: "${doc}". Valid options: ${VALID_DOCS.join(', ')}` })
  }

  const locales = lang === 'en' ? ['en'] : [lang, 'en']

  for (const locale of locales) {
    const filePath = resolve(process.cwd(), `content/${locale}/${doc}.md`)
    try {
      const content = await readFile(filePath, 'utf-8')
      return { locale, doc, content }
    }
    catch {}
  }

  throw createError({ statusCode: 404, message: `Legal document "${doc}" not found` })
})