import { spawn } from 'child_process'

const argumentSplitter = new RegExp('("[^"]+")|([^ ]+)', 'g')

export function splitArguments(args) {
  return Array.from(args.matchAll(argumentSplitter)).map(x => x[0])
}

function sendToStream(stream, source) {
  return function(data) {
    let cleaned = data.toString().replace(/\r\n/g, '\n').split('\n')
    cleaned = cleaned.filter(x => Boolean(x.trim()))
    for (let line of cleaned) {
      stream(line, source)
    }
  }
}

export function runCommand(command, arg, stream = () => {}, returnProcess = false) {
  let baseError = new Error('')
  let options = splitArguments(arg)

  if (!command) {
    command = options[0]
    options = options.slice(1)
  }

  return new Promise(function(res, rej) {
    stream(`> ${command} ${options.join(' ')}\n`)
    let processor = spawn(command, options, { shell: true })

    processor.stdout.on('data', sendToStream(stream, 'stdout'))
    processor.stderr.on('data', sendToStream(stream, 'stderr'))
    processor.on('error', function(err) {
      baseError.message = err.message
      if (!returnProcess) rej(baseError)
    })
    processor.on('exit', function (code) {
      if (code !== 0) {
        baseError.message = 'Program returned error code: ' + code
        if (!returnProcess) return rej(baseError)
      }
      if (!returnProcess) res(code)
    })
    if (returnProcess) {
      res(processor)
    }
  })
}