'use strict'

const co = require('co')
const cli = require('heroku-cli-util')
const {FileCompletion} = require('@heroku-cli/command/lib/completions')

function * run (context) {
  if (context.flags.restart) throw new Error('--restart is no longer available\nUse forego instead: https://github.com/ddollar/forego')
  if (context.flags.concurrency) throw new Error('--concurrency is no longer available\nUse forego instead: https://github.com/ddollar/forego')

  let execArgv = ['start']

  if (context.flags.procfile) execArgv.push('--procfile', context.flags.procfile)
  if (context.flags.env) execArgv.push('--env', context.flags.env)
  if (context.flags.port) execArgv.push('--port', context.flags.port)
  if (context.args.processname) {
    execArgv.push(context.args.processname)
  } else {
    let procfile = context.flags.procfile || 'Procfile'
    let procHash = require('foreman/lib/procfile.js').loadProc(procfile)
    let processes = Object.keys(procHash).filter((x) => x !== 'release')
    execArgv.push(processes.join(','))
  }
  yield require('../../fork_foreman')(execArgv)
}

module.exports = {
  aliases: ['local:start'],
  topic: 'local',
  description: 'run heroku app locally',
  help: 'Start the application specified by a Procfile (defaults to ./Procfile)',
  examples: `$ heroku local
$ heroku local web
$ heroku local web=2
$ heroku local web=1,worker=2`,
  args: [{name: 'processname', optional: true}],
  flags: [
    {name: 'procfile', char: 'f', hasValue: true, description: 'use a different Procfile', completion: FileCompletion},
    {name: 'env', char: 'e', hasValue: true, description: 'location of env file (defaults to .env)', completion: FileCompletion},
    {name: 'port', char: 'p', hasValue: true, description: 'port to listen on'},
    {name: 'restart', char: 'r', hasValue: false, hidden: true, description: 'restart process if it dies'},
    {name: 'concurrency', char: 'c', hasValue: true, hidden: true, description: 'number of processes to start'}
  ],
  run: cli.command(co.wrap(run))
}