import * as fsp from 'fs/promises'
import { PagesManifest } from 'next/dist/build/webpack/plugins/pages-manifest-plugin'
import * as path from 'path'
import { TransformerConfig } from '../types/config.types'

export const findRoutes = async ({
  config,
}: {
  config: TransformerConfig
}): Promise<Array<[string, string]>> => {
  const pagesManifestPath = path.join(
    config.distDir,
    'server/pages-manifest.json',
  )

  const pagesManifest: PagesManifest = await fsp
    .readFile(pagesManifestPath, 'utf-8')
    .then(JSON.parse)

  const validPaths = Object.entries(pagesManifest).filter(
    ([path]) =>
      !path.startsWith('/_') &&
      !path.startsWith('/api/') &&
      !['/404', '/500'].includes(path),
  )

  return validPaths
}