import express from 'express'
import libLanguages from '../lib/languages.js'
import searchVersions from '../lib/search/versions.js'
import loadLunrResults from '../lib/search/lunr-search.js'
const languages = new Set(Object.keys(libLanguages))
const versions = new Set(Object.values(searchVersions))

const router = express.Router()

router.get('/', async function postSearch(req, res, next) {
  res.set({
    'surrogate-control': 'private, no-store',
    'cache-control': 'private, no-store',
  })

  const { query, version, language, filters, limit: limit_ } = req.query
  const limit = Math.min(parseInt(limit_, 10) || 10, 100)
  if (!versions.has(version) || !languages.has(language)) {
    return res.status(400).json([])
  }
  if (!query || !limit) {
    return res.status(200).json([])
  }

  try {
    const results = await loadLunrResults({
      version,
      language,
      query: `${query} ${filters || ''}`,
      limit,
    })
    // Only reply if the headers have not been sent and the request was not aborted...
    if (!res.headersSent && !req.aborted) {
      return res.status(200).json(results)
    }
  } catch (err) {
    console.error(err)
    // Only reply if the headers have not been sent and the request was not aborted...
    if (!res.headersSent && !req.aborted) {
      return res.status(400).json([])
    }
  }
})

export default router