/**
 * Post-build script: inline remaining external assets (favicon) into index.html
 * and remove leftover files so only a single HTML file remains.
 */
import { readFileSync, writeFileSync, rmSync, existsSync } from 'fs'
import { join, dirname } from 'path'
import { fileURLToPath } from 'url'

const __dirname = dirname(fileURLToPath(import.meta.url))
const distDir = join(__dirname, '..', 'dist')

// Read favicon SVG and encode as data URI
const faviconPath = join(distDir, 'favicon.svg')
if (existsSync(faviconPath)) {
  const svgContent = readFileSync(faviconPath, 'utf8')
  const encoded = Buffer.from(svgContent).toString('base64')
  const dataUri = `data:image/svg+xml;base64,${encoded}`

  // Replace the favicon link in index.html
  const indexPath = join(distDir, 'index.html')
  let html = readFileSync(indexPath, 'utf8')
  html = html.replace(
    /<link rel="icon"[^>]*href="[^"]*favicon\.svg"[^>]*\/?>/i,
    `<link rel="icon" type="image/svg+xml" href="${dataUri}" />`
  )
  writeFileSync(indexPath, html)

  // Remove the standalone SVG
  rmSync(faviconPath)
  console.log('[inline-assets] Inlined favicon.svg into index.html')
}

// Remove any other leftover asset files (e.g. icons.svg from Svelte compiler,
// and the source pwa-icon.svg which is only needed to regenerate the PNGs).
for (const leftover of ['icons.svg', 'pwa-icon.svg']) {
  const p = join(distDir, leftover)
  if (existsSync(p)) {
    rmSync(p)
    console.log(`[inline-assets] Removed ${leftover}`)
  }
}

// Remove assets directory if it exists
const assetsDir = join(distDir, 'assets')
if (existsSync(assetsDir)) {
  rmSync(assetsDir, { recursive: true })
  console.log('[inline-assets] Removed assets/ directory')
}

// Keep the PWA companion files that MUST ship alongside index.html so a user
// can install the app: the web manifest, the service worker, and the icon set.
// (These are public/ files Vite copied into dist/; do not delete them.)
for (const keep of ['manifest.webmanifest', 'sw.js', 'icons']) {
  const p = join(distDir, keep)
  if (existsSync(p)) console.log(`[inline-assets] Preserved PWA ${keep}: ${p}`)
}

console.log('[inline-assets] Done — dist/ contains index.html + PWA files')