'use strict'

const cli = require('heroku-cli-util')
const co = require('co')

function * run (context, heroku) {
  if (context.args.length === 0) {
    cli.exit(1, 'Usage: heroku config:set KEY1=VALUE1 [KEY2=VALUE2 ...]\nMust specify KEY and VALUE to set.')
  }

  const { reduce, pickBy, mapKeys } = require('lodash')

  function lastRelease () {
    return heroku.request({
      method: 'GET',
      partial: true,
      path: `/apps/${context.app}/releases`,
      headers: { Range: 'version ..; order=desc,max=1' }
    }).then((releases) => releases[0])
  }

  let vars = reduce(context.args, function (vars, v) {
    let idx = v.indexOf('=')
    if (idx === -1) {
      cli.error(`${cli.color.cyan(v)} is invalid. Must be in the format ${cli.color.cyan('FOO=bar')}.`)
      process.exit(1)
    }
    vars[v.slice(0, idx)] = v.slice(idx + 1)
    return vars
  }, {})

  let config

  yield cli.action(
    `Setting ${context.args.map((v) => cli.color.configVar(v.split('=')[0])).join(', ')} and restarting ${cli.color.app(context.app)}`,
    { success: false },
    co(function * () {
      config = yield heroku.request({
        method: 'patch',
        path: `/apps/${context.app}/config-vars`,
        body: vars
      })
      let release = yield lastRelease()
      cli.action.done(`done, ${cli.color.release('v' + release.version)}`)
    })
  )

  config = pickBy(config, (_, k) => vars[k])
  config = mapKeys(config, (_, k) => cli.color.green(k))
  cli.styledObject(config)
  yield context.config.runHook('recache', { type: 'config', app: context.app })
}

let cmd = {
  description: 'set one or more config vars',
  examples: `$ heroku config:set RAILS_ENV=staging
Setting config vars and restarting example... done, v10
RAILS_ENV: staging

$ heroku config:set RAILS_ENV=staging RACK_ENV=staging
Setting config vars and restarting example... done, v11
RAILS_ENV: staging
RACK_ENV:  staging`,
  needsApp: true,
  needsAuth: true,
  variableArgs: true,
  run: cli.command({ preauth: true }, co.wrap(run))
}

module.exports = [
  Object.assign({ topic: 'config', command: 'set' }, cmd),
  Object.assign({ topic: 'config', command: 'add', hidden: true }, cmd)
]