'use strict'

const IPFS = require('ipfs')
const Repo = require('ipfs-repo')
const LevelStore = require('datastore-level')

function MemoryLevelStore() {
    return new LevelStore('/memory', {db: require('memdown')})
}
MemoryLevelStore.prototype = new LevelStore('/memory', {db: require('memdown')})
MemoryLevelStore.prototype.constructor = MemoryLevelStore

const stringToUse = 'Hello world from self-contained, self-hosted js-ipfs!!!'

function App() {
    let node

    create()

    function create () {
      // Create the IPFS node instance

      var repo_name = String(Math.random() + Date.now())
      var storage_backends = {
        root: MemoryLevelStore,
        blocks: MemoryLevelStore,
        datastore: MemoryLevelStore,
      }

      node = new IPFS({ repo: new Repo(repo_name, {storageBackends: storage_backends}) })

      node.once('ready', () => {
        console.log('IPFS node is ready')
        ops()
      })
    }

    function ops () {
      node.id((err, res) => {
          if (err) {
              throw err
          }

          document.body.insertAdjacentHTML('beforeend',
              "<h1>Everything is working!</h1>" +
              "<p>Your ID is <strong>" + res.id + "</strong></p>" +
              "<p>Your IPFS version is <strong>" + res.agentVersion + "</strong></p>" +
              "<p>Your IPFS protocol version is <strong>" + res.protocolVersion + "</strong></p>"
          )
      })

      node.files.add([Buffer.from(stringToUse)], (err, filesAdded) => {
        if (err) { console.log("ERROR"); throw err }

        const hash = filesAdded[0].hash
        document.body.insertAdjacentHTML('beforeend', "<hr /><div>Added a file!<br /><a href=\"https://gateway.ipfs.io/ipfs/" + hash + "\">" + hash + "</a></div>")

        node.files.cat(hash, (err, data) => {
          if (err) { console.log("ERROR 2"); throw err }
          document.body.insertAdjacentHTML('beforeend', "<p>Contents of this file: <br />" + data + "</p>")
        })
      })
    }
}

module.exports = App

App()