#!/usr/bin/env node
/**
 * Sert dist-portal + chaque dist-<slug> sous /slides/<slug>/ (tests E2E, prod locale).
 * Comme le plugin Vite en dev : racine du deck → 302 vers /slides/<slug>/1 ; routes Slidev (/1, /2…) via SPA (sirv single).
 */
import http from 'node:http'
import path from 'node:path'
import { fileURLToPath } from 'node:url'
import sirv from 'sirv'
import { listPresentationSlugs } from './list-slugs.mjs'

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
const port = Number(process.env.PREVIEW_PORT || 4174)

const portalStatic = sirv(path.join(root, 'dist-portal'), { etag: true })
const slideSirv = new Map()

function getSirv(slug) {
  if (!slideSirv.has(slug)) {
    slideSirv.set(
      slug,
      sirv(path.join(root, `dist-${slug}`), {
        etag: true,
        single: 'index.html',
      }),
    )
  }
  return slideSirv.get(slug)
}

const server = http.createServer((req, res) => {
  const u = new URL(req.url || '/', 'http://127.0.0.1')
  const pathname = u.pathname
  const m = pathname.match(/^\/slides\/([^/]+)(.*)$/)
  if (m) {
    const slug = m[1]
    const rest = m[2] || '/'
    const slugs = new Set(listPresentationSlugs(root))
    if (!slugs.has(slug)) {
      res.statusCode = 404
      res.end('not found')
      return
    }
    const atDeckRoot = rest === '/' || rest === ''
    if (atDeckRoot && (req.method === 'GET' || req.method === 'HEAD')) {
      res.statusCode = 302
      res.setHeader('Location', `/slides/${slug}/1${u.search || ''}`)
      res.end()
      return
    }
    const orig = req.url
    req.url = rest + (u.search || '')
    getSirv(slug)(req, res, () => {
      req.url = orig
      res.statusCode = 404
      res.end()
    })
    return
  }
  portalStatic(req, res, () => {
    res.statusCode = 404
    res.end('not found')
  })
})

server.listen(port, '127.0.0.1', () => {
  console.log(`[static-preview] http://127.0.0.1:${port}/`)
})