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import express from 'express'

import libLanguages from '../lib/languages.js'

import searchVersions from '../lib/search/versions.js'

import loadLunrResults, { QueryTermError } from '../lib/search/lunr-search.js'

import { cacheControlFactory } from './cache-control.js'

const languages = new Set(Object.keys(libLanguages))

const versions = new Set(Object.values(searchVersions))

const router = express.Router()

const cacheControl = cacheControlFactory(60 * 60 * 24)

const noCacheControl = cacheControlFactory(0)

router.get('/', async function getSearch(req, res, next) {

const { query, version, language, filters, limit: limit_ } = req.query

const limit = Math.min(parseInt(limit_, 10) || 10, 100)

if (!versions.has(version)) {

return res.status(400).json({ error: 'Unrecognized version' })

}

if (!languages.has(language)) {

return res.status(400).json({ error: 'Unrecognized language' })

}

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) {

cacheControl(res)

// Undo the cookie setting that CSRF sets.

// Otherwise it can't be cached in the CDN.

res.removeHeader('set-cookie')

return res.status(200).json(results)

}

} catch (err) {

if (err instanceof QueryTermError) {

// Handled as an not entirely unexpected potential error

return res.status(400).json({ error: err.toString() })

}

console.error(err)

// Only reply if the headers have not been sent and the request was not aborted...

if (!res.headersSent && !req.aborted) {

noCacheControl(res)

return res.status(400).json({ error: err.toString() })

}

}

})

export default router