'use strict'

const co = require('co')
const cli = require('heroku-cli-util')
const host = require('../lib/host')

function * run (context, heroku) {
  const util = require('../lib/util')
  const fetcher = require('../lib/fetcher')(heroku)
  const { app, args, flags } = context

  let db = yield fetcher.addon(app, args.database)
  let addon = yield heroku.get(`/addons/${encodeURIComponent(db.name)}`)
  let credential = flags.credential || 'default'

  if (util.starterPlan(db)) throw new Error('This operation is not supported by Hobby tier databases.')

  let attachment = yield cli.action(
    `Enabling Connection Pooling${credential === 'default' ? '' : ' for credential ' + cli.color.addon(credential)} on ${cli.color.addon(addon.name)} to ${cli.color.app(app)}`,
    heroku.post(`/client/v11/databases/${encodeURIComponent(db.name)}/connection-pooling`, {
      body: { name: flags.as, credential: credential, app: app },
      host: host(db)
    })
  )

  yield cli.action(
    `Setting ${cli.color.attachment(attachment.name)} config vars and restarting ${cli.color.app(app)}`,
    { success: false },
    co(function * () {
      let releases = yield heroku.get(`/apps/${app}/releases`, {
        partial: true,
        headers: { 'Range': 'version ..; max=1, order=desc' }
      })
      cli.action.done(`done, v${releases[0].version}`)
    })
  )
}

module.exports = {
  topic: 'pg',
  command: 'connection-pooling:attach',
  description: 'add an attachment to a database using connection pooling',
  needsApp: true,
  needsAuth: true,
  help: `Example:

  heroku pg:connection-pooling:attach postgresql-something-12345 --credential cred-name
`,
  args: [{ name: 'database', optional: true }],
  flags: [
    { name: 'as', description: 'name for add-on attachment', hasValue: true },
    { name: 'credential', char: 'n', hasValue: true, required: false, description: 'name of the credential within the database' }
  ],
  run: cli.command({ preauth: true }, co.wrap(run))
}