const crypto = require('crypto')
const { promisify } = require('util')

const store = require('../store')
const pubUtils = require('./utils')
const config = require('../config.json')

const generateKeyPairPromise = promisify(crypto.generateKeyPair)

module.exports = {
  createLocalActor,
  getOrCreateActor
}

function createLocalActor (name, type) {
  return generateKeyPairPromise('rsa', {
    modulusLength: 4096,
    publicKeyEncoding: {
      type: 'spki',
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'pkcs8',
      format: 'pem'
    }
  }).then(pair => {
    const actorBase = pubUtils.usernameToIRI(name)
    return {
      _meta: {
        privateKey: pair.privateKey
      },
      id: `${actorBase}`,
      type: type,
      following: `${actorBase}/following`,
      followers: `${actorBase}/followers`,
      liked: `${actorBase}/liked`,
      inbox: `${actorBase}/inbox`,
      outbox: `${actorBase}/outbox`,
      preferredUsername: name,
      name: `${name} group`,
      summary: `I'm a group about ${name}. Follow me to get all the group posts. Tag me to share with the group. Create other groups by searching for or tagging @yourGroupName@${config.DOMAIN}`,
      icon: `https://${config.DOMAIN}/f/guppe.png`,
      publicKey: {
        id: `${actorBase}#main-key`,
        owner: `${actorBase}`,
        publicKeyPem: pair.publicKey
      }
    }
  })
}

async function getOrCreateActor (preferredUsername, includeMeta) {
  const id = pubUtils.usernameToIRI(preferredUsername)
  let user = await store.actor.getActor(id, includeMeta)
  if (user) {
    return user
  }
  // auto create groups whenever an unknown actor is referenced
  user = await createLocalActor(preferredUsername, 'Group')
  await store.object.save(user)
  // only executed on success
  delete user._id
  if (includeMeta !== true) {
    delete user._meta
  }
  return user
}