#!/usr/bin/env node
/**
 * Build Slidev pour un slug → dossier dist-<slug>/ à la racine du dépôt.
 * Usage : node tools/build-deck.mjs <slug>
 */
import fs from 'node:fs'
import path from 'node:path'
import { fileURLToPath } from 'node:url'
import { execFileSync } from 'node:child_process'
import { sitePath } from './site-base.mjs'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const root = path.resolve(__dirname, '..')

function publishBuild(wipDir, finalDir) {
  fs.mkdirSync(finalDir, { recursive: true })
  fs.cpSync(wipDir, finalDir, { recursive: true, force: true })
  fs.rmSync(wipDir, { recursive: true, force: true })
}

function slidevBin() {
  const p = path.join(root, 'node_modules', '.bin', 'slidev')
  if (fs.existsSync(p)) return p
  return 'slidev'
}

const slug = process.argv[2]
if (!slug || slug.startsWith('wip_')) {
  console.error('usage: node tools/build-deck.mjs <slug>')
  process.exit(1)
}

const entry = path.join(root, 'slides', slug, 'slides.md')
const metaPath = path.join(root, 'slides', slug, 'meta.json')
if (!fs.existsSync(entry) || !fs.existsSync(metaPath)) {
  console.error(`[build-deck] slides/${slug}/ incomplet (slides.md + meta.json requis)`)
  process.exit(1)
}

const finalDir = path.join(root, `dist-${slug}`)
const wipDir = path.join(root, '.slide-wip', slug)
const base = sitePath(`/slides/${slug}/`)
if (!base.endsWith('/')) throw new Error(`base invalide: ${base}`)

fs.rmSync(wipDir, { recursive: true, force: true })
fs.mkdirSync(wipDir, { recursive: true })
/* Ne pas supprimer slides/<slug>/index.html avant le build : Slidev s’attend à pouvoir unlink ce fichier en fin de build. */
console.log(`[build-deck] ${slug} → dist-${slug}/ (base=${base})`)
try {
  execFileSync(
    slidevBin(),
    ['build', entry, '--out', wipDir, '--base', base],
    { stdio: 'inherit', cwd: root, env: process.env },
  )
  publishBuild(wipDir, finalDir)
  /* Slidev peut écrire un index.html à côté de slides.md — inutile et bruyant au build suivant */
  try {
    fs.rmSync(path.join(root, 'slides', slug, 'index.html'), { force: true })
  } catch {
    /* ignore */
  }
} catch (e) {
  try {
    fs.rmSync(wipDir, { recursive: true, force: true })
  } catch {
    /* ignore */
  }
  process.exit(1)
}