'use strict'

/**
 * This will be removed in next versions as it is not handled in the babel-loader
 * See: https://github.com/geowarin/friendly-errors-webpack-plugin/issues/2
 */
function cleanStackTrace (message) {
  return message
    .replace(/^\s*at\s.*:\d+:\d+[\s)]*\n/gm, '') // at ... ...:x:y
}

function cleanMessage (message) {
  return message
  // match until the last semicolon followed by a space
  // this should match
  // linux => "(SyntaxError: )Unexpected token (5:11)"
  // windows => "(SyntaxError: C:/projects/index.js: )Unexpected token (5:11)"
    .replace(/^Module build failed.*:(\sSyntaxError:(.*:)?)?\s/, 'Syntax Error: ')
}

function isBabelSyntaxError (e) {
  return e.name === 'ModuleBuildError' &&
    e.message.indexOf('SyntaxError') >= 0
}

function transform (error) {
  if (isBabelSyntaxError(error)) {
    return Object.assign({}, error, {
      message: cleanStackTrace(cleanMessage(error.message) + '\n'),
      severity: 1000,
      name: 'Syntax Error'
    })
  }

  return error
}

module.exports = transform
