const out = {
  currentlang: 'en',
}

const i18n = {
  lang_change_long:       ['Skipta yfir á íslensku',
                           'Change to english'],
  lang_current:           ['en',
                           'is'],
  header_title:           ['Fíladelfia archival center',
                           'Fíladelfia myndhvelfing'],
  header_logout:          ['Log out',
                           'Skrá út'],
  title:                  ['Title',
                           'Titill'],
  date:                   ['Date',
                           'Dagsetning'],
  language:               ['EN',
                           'IS'],
  upload_goto:            ['Upload',
                           'Upphlaða'],
  login_error:            ['Error while logging in: {0}',
                           'Villa við innskráningu: {0}'],
  login_error_auth:       ['Unknown error from server. Try again later.',
                           'Óþekkt villa frá vefþjóni. Reyndu aftur seinna.'],
  login_missing_email:    ['Email is missing',
                           'Email eða nafn vantar'],
  login_missing_password: ['Password is missing',
                           'Lykilorð vantar'],
  login_email:            ['Email or name',
                           'Email eða nafn'],
  login_password:         ['Password',
                           'Lykilorð'],
  login_submit:           ['Log in',
                           'Skrá inn'],
  upload_missing_title:   ['Title is missing',
                           'Titill vantar'],
  upload_missing_date:    ['Date is missing',
                           'Dagsetning vantar'],
  upload_missing_file:    ['Video file missing',
                           'Myndaskrá vantar'],
  upload_missing_banner:  ['Poster image missing',
                           'Mynd vantar'],
  upload_error:           ['Error while uploading: {0}',
                           'Villa við að hlaða upp myndefni: {0}'],
  unsplash:               ['Photo by {0} on {1}',
                           'Mynd eftir {0} frá {1}'],
  api_down:               ['No internet or browser blocked the request.',
                           'Ekkert net eða vafri blockaði fyrirspurn.'],
  months: {
    '1':                  ['January',
                           'Janúar'],
    '2':                  ['February',
                           'Febrúar'],
    '3':                  ['March',
                           'Mars'],
    '4':                  ['April',
                           'Apríl'],
    '5':                  ['May',
                           'Maí'],
    '6':                  ['June',
                           'Júní'],
    '7':                  ['July',
                           'Júlí'],
    '8':                  ['August',
                           'Ágúst'],
    '9':                  ['September',
                           'September'],
    '10':                 ['Oktober',
                           'Október'],
    '11':                 ['November',
                           'Nóvember'],
    '12':                 ['December',
                           'Desember'],
  },
}
const langs = {
  'en': 0,
  'is': 1,
}

const regexNumber = new RegExp('^\\d+$')

out.langset = function(lang) {
  out.currentlang = lang
  let index = langs[lang]

  for (let key of Object.keys(i18n)) {
    if (!Array.isArray(i18n[key])) {
      out[key] = {}
      for (let subKey of Object.keys(i18n[key])) {
        out[key][subKey] = i18n[key][subKey][index]
      }
    } else {
      out[key] = i18n[key][index]
    }
  }
}

out.langtoggle = function() {
  out.langset(out.currentlang === 'en' ? 'is' : 'en')
  return false
}

out.format = function(str, ...args) {
  return out.mformat(str, ...args).join('')
}

out.mformat = function(str, ...args) {
  let split = (str || '').split(/\{|\}/)
  return split.map(function(item) {
    if (regexNumber.test(item)) {
      return args[Number(item)] || item
    }
    return item
  })
}

out.langset('is')

module.exports = out