#!/usr/bin/env node
/**
 * Generates src/lib/edit-on-github-routes.js by scanning src/pages for index.mdx.
 * Used by Layout.jsx so "Edit on GitHub" links point to .../index.mdx for those routes.
 * Run automatically with dev and build.
 */

import fs from 'fs'
import path from 'path'
import { fileURLToPath } from 'url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const ROOT = path.join(__dirname, '..')
const PAGES_DIR = path.join(ROOT, 'src/pages')
const OUT_PATH = path.join(ROOT, 'src/lib/edit-on-github-routes.js')

function findIndexMdxRoutes(dir, basePath = '') {
  const entries = fs.readdirSync(dir, { withFileTypes: true })
  const routes = []
  for (const e of entries) {
    const rel = basePath ? `${basePath}/${e.name}` : e.name
    if (e.isDirectory()) {
      routes.push(...findIndexMdxRoutes(path.join(dir, e.name), rel))
    } else if (e.name === 'index.mdx') {
      routes.push('/' + basePath)
    }
  }
  return routes
}

const routes = findIndexMdxRoutes(PAGES_DIR)
  .filter((r) => r !== '') // ignore root index if any
  .sort()

const content = `// Auto-generated by scripts/generate-github-routes.mjs – do not edit
/** Pathnames served by src/pages/.../index.mdx (Edit on GitHub must link to /index.mdx). */
export const EDIT_ON_GITHUB_INDEX_ROUTES = new Set(${JSON.stringify(routes)});
`

fs.mkdirSync(path.dirname(OUT_PATH), { recursive: true })
fs.writeFileSync(OUT_PATH, content, 'utf8')
console.log('Generated', OUT_PATH, 'with', routes.length, 'index routes')