// button click handler
const fetchAndBroadcast = async () => {
  // reset UI
  $('#fetching-status').html('')
  $('#fetching-progress').css('visibility', 'hidden')
  $('#fetching-progress').val(0)
  $('#file-download').html('')
  $('#events-found').text('')
  $('#broadcasting-status').html('')
  $('#broadcasting-progress').css('visibility', 'hidden')
  $('#broadcasting-progress').val(0)
  // messages to show to user
  const checkMark = '✓'
  const txt = {
    broadcasting: 'Broadcasting to relays... ',
    fetching: 'Fetching from relays... ',
    download: `Downloading Backup file... ${checkMark}`,
  }
  $('#checking-relays-header').text("Waiting for Relays: ")
  // parse pubkey ('npub' or hexa)
  const pubkey = parsePubkey($('#pubkey').val())
  if (!pubkey) return
  // disable button (will be re-enable at the end of the process)
  $('#fetch-and-broadcast').prop('disabled', true)
  // inform user that app is fetching from relays
  $('#fetching-status').text(txt.fetching)
  // show and update fetching progress bar
  $('#fetching-progress').css('visibility', 'visible')
  $('#fetching-progress').prop('max', relays.length)

  $('#checking-relays-header-box').css('display', 'flex')
  $('#checking-relays-box').css('display', 'flex')
  $('#checking-relays-header').text("Waiting for Relays:")

  // get all events from relays
  const filters =[{ authors: [pubkey] }, { "#p": [pubkey] }] 
  const data = (await getEvents(filters, pubkey)).sort((a, b) => b.created_at - a.created_at)

  // inform user fetching is done
  $('#fetching-status').html(txt.fetching + checkMark)
  $('#fetching-progress').val(relays.length)

  const latestKind3 = data.filter((it) => it.kind == 3 && it.pubkey === pubkey)[0]  
  const myRelaySet = JSON.parse(latestKind3.content)
  relays = Object.keys(myRelaySet).filter(url => myRelaySet[url].write).map(url => url)

  $('#checking-relays-header-box').css('display', 'none')
  $('#checking-relays-box').css('display', 'none')
  // inform user that backup file (js format) is being downloaded
  $('#file-download').html(txt.download)
  downloadFile(data, 'nostr-backup.js')
  // inform user that app is broadcasting events to relays
  $('#broadcasting-status').html(txt.broadcasting)
  // show and update broadcasting progress bar
  $('#broadcasting-progress').css('visibility', 'visible')
  $('#broadcasting-progress').prop('max', relays.length)
  
  $('#checking-relays-header-box').css('display', 'flex')
  $('#checking-relays-box').css('display', 'flex')
  $('#checking-relays-header').text("Broadcasting to Relays:")

  await broadcastEvents(data)

  // inform user that broadcasting is done
  $('#broadcasting-status').html(txt.broadcasting + checkMark)
  $('#broadcasting-progress').val(relays.length)
  // re-enable broadcast button
  $('#fetch-and-broadcast').prop('disabled', false)
}

const getFromExtension = async () => {
  const pubkey = await window.nostr.getPublicKey()
  if (pubkey) $('#pubkey').val(pubkey).change()
}

const pubkeyOnChange = () => {
  $('#fetch-and-broadcast').css('display', '')
  $('#get-from-extension').css('display', 'none')
}

if (window.nostr) {
  $('#fetch-and-broadcast').css('display', 'none')
  $('#get-from-extension').css('display', '')
}