#!/usr/bin/env node

// [start-readme]
//
// This is a convenience script for replacing the contents of translated
// files with the English content from their corresponding source file.
//
// It's intended to be a workaround to temporarily bypass Crowdin parser bugs
// while we wait for translators to fix them.
//
// Usage:
// script/reset-translated-file.js <filename>
//
// Examples:
//
// $ script/reset-translated-file.js translations/es-XL/content/actions/index.md
//
// [end-readme]

const program = require('commander')
const { execSync } = require('child_process')
const assert = require('assert')
const fs = require('fs')
const path = require('path')
const chalk = require('chalk')

program
  .description('reset translated files')
  .option('-m, --prefer-main', 'Reset file to the translated file, try using the file from `main` branch first, if not found (usually due to renaming), fall back to English source.')
  .parse(process.argv)

const resetToEnglishSource = (translationFilePath) => {
  assert(translationFilePath.startsWith('translations/'), 'path argument must be in the format `translations/<lang>/path/to/file`')
  assert(fs.existsSync(translationFilePath), `file does not exist: ${translationFilePath}`)

  const relativePath = translationFilePath.split(path.sep).slice(2).join(path.sep)
  const englishFile = path.join(process.cwd(), relativePath)
  assert(fs.existsSync(englishFile), `file does not exist: ${englishFile}`)

  // replace file with English source
  const englishContent = fs.readFileSync(englishFile, 'utf8')
  fs.writeFileSync(translationFilePath, englishContent)
  console.log('-> reverted to English: %s', path.relative(process.cwd(), translationFilePath))
}

const [pathArg] = program.args
assert(pathArg, 'first arg must be a target filename')

// Is the arg a fully-qualified path?
const relativePath = fs.existsSync(pathArg)
  ? path.relative(process.cwd(), pathArg)
  : pathArg

if (program.preferMain) {
  try {
    execSync(`git checkout main -- ${relativePath}`, { stdio: 'pipe' })
    console.log('-> reverted to file from main branch: %s', relativePath)
  } catch (e) {
    if (e.message.includes('pathspec')) {
      console.warn(chalk.red(`cannot find ${relativePath} in main branch (likely because it was renamed); falling back to English source file.`))
      resetToEnglishSource(relativePath)
    } else {
      console.warn(e.message)
    }
  }
} else {
  resetToEnglishSource(relativePath)
}