const fetch = require('npm-registry-fetch')
const log = require('npmlog')
const npa = require('npm-package-arg')

const getIdentity = require('./utils/get-identity')

const BaseCommand = require('./base-command.js')
class Star extends BaseCommand {
  static get description () {
    return 'Mark your favorite packages'
  }

  /* istanbul ignore next - see test/lib/load-all-commands.js */
  static get name () {
    return 'star'
  }

  /* istanbul ignore next - see test/lib/load-all-commands.js */
  static get usage () {
    return ['[<pkg>...]']
  }

  exec (args, cb) {
    this.star(args).then(() => cb()).catch(cb)
  }

  async star (args) {
    if (!args.length)
      throw new Error(this.usage)

    // if we're unstarring, then show an empty star image
    // otherwise, show the full star image
    const unicode = this.npm.config.get('unicode')
    const unstar = this.npm.config.get('star.unstar')
    const full = unicode ? '\u2605 ' : '(*)'
    const empty = unicode ? '\u2606 ' : '( )'
    const show = unstar ? empty : full

    const pkgs = args.map(npa)
    for (const pkg of pkgs) {
      const [username, fullData] = await Promise.all([
        getIdentity(this.npm, this.npm.flatOptions),
        fetch.json(pkg.escapedName, {
          ...this.npm.flatOptions,
          spec: pkg,
          query: { write: true },
          preferOnline: true,
        }),
      ])

      if (!username)
        throw new Error('You need to be logged in!')

      const body = {
        _id: fullData._id,
        _rev: fullData._rev,
        users: fullData.users || {},
      }

      if (!unstar) {
        log.info('star', 'starring', body._id)
        body.users[username] = true
        log.verbose('star', 'starring', body)
      } else {
        delete body.users[username]
        log.info('unstar', 'unstarring', body._id)
        log.verbose('unstar', 'unstarring', body)
      }

      const data = await fetch.json(pkg.escapedName, {
        ...this.npm.flatOptions,
        spec: pkg,
        method: 'PUT',
        body,
      })

      this.npm.output(show + ' ' + pkg.name)
      log.verbose('star', data)
      return data
    }
  }
}
module.exports = Star
