/**
 * Simple tool for extracting source code from sourcemaps.
 * Puts extracted files in ./<sourcemap_file_name>_extracted/
 * Puts files from `../` (for example, webpack puts there node_modules) dir to _extracted/__/,
 * and files from `./` to _extracted/
 *
 * (c) tggdesu 2019. Licensed under GPLv3.
 */

import * as fs from 'node:fs/promises'
import * as path from 'node:path'
import { question } from 'zx'

interface SourceMap {
  sources: string[]
  sourcesContent: string[]
}

const input = await question('URL or path to file > ')
const outDirDefault = `./assets/${input.split('/').pop()?.split('?')[0]}_extracted`
const outDir = await question(`Output directory [${outDirDefault}]> `)

let content: SourceMap
if (/^https?:\/\//i.test(input)) {
  console.log('[+] Fetching sourcemap')
  const response = await fetch(input)
  content = await response.json() as SourceMap
} else {
  const data = await fs.readFile(input, 'utf-8')
  content = JSON.parse(data) as SourceMap
}

if (!content.sources || !content.sourcesContent || content.sources.length !== content.sourcesContent.length) {
  console.error('[!] Sourcemap is either invalid or does not contain source code')
  process.exit(1)
}

for (let i = 0; i < content.sources.length; i++) {
  const fname = content.sources[i]
    .replace(/[\\/]\.[\\/]/g, '/_/')
    .replace(/[\\/]\.\.[\\/]/g, '/__/')
    .replace(/[:*?'"<>|&]/g, '')
  process.stdout.write(`[~] ${fname}\r`)
  await fs.mkdir(path.join(outDir, path.dirname(fname)), { recursive: true })
  await fs.writeFile(path.join(outDir, fname), content.sourcesContent[i])
}

console.log('\n[v] Finished!')