'use strict'
const config = require('../config.json')
const consts = require('./consts')

module.exports = {
  usernameToIRI,
  toJSONLD,
  arrayToCollection,
  actorFromActivity
}

function actorFromActivity (activity) {
  if (Object.prototype.toString.call(activity.actor) === '[object String]') {
    return activity.actor
  }
  if (activity.actor.type === 'Link') {
    return activity.actor.href
  }
  return activity.actor.id
}

function arrayToCollection (arr, ordered) {
  return {
    '@context': consts.ASContext,
    totalItems: arr.length,
    type: ordered ? 'orderedCollection' : 'collection',
    [ordered ? 'orderedItems' : 'items']: arr
  }
}

function toJSONLD (obj) {
  obj['@context'] = obj['@context'] || consts.ASContext
  return obj
}

function usernameToIRI (user) {
  return `https://${config.DOMAIN}/u/${user}`
}