import toxcore

import std/asyncdispatch, std/asyncfile, std/base64, std/json, std/httpclient,
    std/os, std/strutils, std/uri

{.passL: "-lcrypto".}

const
  readmeText = readFile "README.md"
  spaceApiUrl = "http://spaceapi.hq.c3d2.de:3000/spaceapi.json"
  shalterLockUrl = "http://172.22.99.204/door/lock"
  shalterUnlockUrl = "http://172.22.99.204/door/unlock"
    # These are IP addresses so the door can be unlocked without DNS
  saveFileName = "hqtoxbot.save"
  iconFilename = "avatar.png"
  adminIds = [
    toAddress "DF0AC9107E0A30E7201C6832B017AC836FBD1EDAC390EE99B68625D73C3FD929FB47F1872CA4"
    # Emery
  ]


proc bootstrap(bot: Tox) =
  const servers = [
    ("tox.neuland.technology",
      "15E9C309CFCB79FDDF0EBA057DABB49FE15F3803B1BFF06536AE2E5BA5E4690E".toPublicKey
    )
  ]
  for host, key in servers.items:
    bot.bootstrap(host, key)

proc addAdmin(bot: Tox; id: Address) =
  try:
    discard bot.addFriend(
      id, "You have been granted administrative rights to " & bot.name)
  except ToxError:
    discard

proc sendAvatar(bot: Tox; friend: Friend) =
  discard bot.send(
    friend, TOX_FILE_KIND_AVATAR.uint32,
    iconFilename.getFileSize, iconFilename)

proc sendAvatarChunk(bot: Tox; friend: Friend; file: FileTransfer; pos: uint64;
    size: int) {.async.} =
  let iconFile = openAsync(iconFilename, fmRead)
  iconFile.setFilePos(pos.int64);
  let chunk = await iconFile.read(size)
  close iconFile
  bot.sendChunk(friend, file, pos, chunk)

proc updateAvatar(bot: Tox) =
  assert(iconFilename != "")
  for friend in bot.friends:
    if bot.connectionStatus(friend) != TOX_CONNECTION_NONE:
      bot.sendAvatar(friend)

proc updateStatus(bot: Tox) {.async.} =
  try:
    let
      http = newAsyncHttpClient()
      rsp = await http.get(spaceApiUrl)
      body = await rsp.body
      space = parseJson body
      status = space["status"].getStr
      open = space["state"]["open"].getBool
    if bot.statusMessage != status:
      bot.statusMessage = status
      if open:
        bot.status = TOX_USER_STATUS_NONE
        let iconUrl = space["icon"]["open"].getStr.parseUri
        await http.downloadFile($iconUrl, iconFilename)
      else:
        bot.status = TOX_USER_STATUS_AWAY
        let iconUrl = space["icon"]["closed"].getStr.parseUri
        await http.downloadFile($iconUrl, iconFilename)
      bot.updateAvatar()
    close http
  except:
    echo getCurrentExceptionMsg()
    bot.statusMessage = "status update failed"

type Command = enum
  doorpass,
  help,
  invite,
  lock,
  readme,
  revoke,
  unlock

proc setup(bot: Tox) =
  addTimer(20*1000, oneshot = false) do (fd: AsyncFD) -> bool:
    asyncCheck updateStatus(bot)

  let schalterClient = newAsyncHttpClient()
  schalterClient.headers = newHttpHeaders()

  let conference = bot.newConference()
  `title=`(bot, conference, "C3D2")

  bot.onFriendConnectionStatus do (f: Friend; status: Connection):
    if status != TOX_CONNECTION_NONE:
      bot.invite(f, conference)
      bot.sendAvatar(f)

  bot.onFriendMessage do (f: Friend; msg: string; kind: MessageType):
    proc reply(msg: string) =
      discard bot.send(f, msg)
    try:
      var words = msg.split(' ')
      if words.len < 1:
        words.add "help"
      if words.len < 2:
        words.add ""

      case parseEnum[Command](words[0].normalize)

      of help:
        var cmd = help
        if words[1] != "":
          try: cmd = parseEnum[Command](words[1].normalize)
          except:
            reply("$1 is not a help topic" % words[1])
        case cmd:
          of doorpass:
            reply("""Set the authorization string for opening the door lock. """ &
              """The authorization string will peristent until the bot is restarted.""")
          of help:
            var resp = """Return help message for the following commands:"""
            for e in Command:
              resp.add "\n\t"
              resp.add $e
            reply(resp)
          of invite:
            reply """Invite a new user to the bot."""
          of lock:
            reply("""Lock the HQ door. """ &
              """If the door is already open his command is not effective.""")
          of readme:
            reply """Return bot README"""
          of revoke:
            reply """Remove yourself from the bot roster."""
          of unlock:
            reply """Unlock the HQ door."""

      of doorpass:
        schalterClient.headers["Authorization"] =
          "Basic " & base64.encode(words[1], newline = "")
      of invite:
        for id in words[1..words.high]:
          try:
            discard bot.addFriend(id.toAddress,
                "You have been invited to the $1 by $2 ($3)" % [bot.name,
                bot.name(f), $bot.publicKey(f)])
          except:
            reply(getCurrentExceptionMsg())

      of lock:
        bot.typing(f, true)
        let fut = schalterClient.post(shalterLockUrl)
        fut.addCallback do ():
          bot.typing(f, false)
          if fut.failed:
            reply("lock failed")
          else:
            reply(fut.read.status)

      of readme:
        reply readmeText

      of revoke:
        reply """Tchuss"""
        discard bot.delete(f)

      of unlock:
        bot.typing(f, true)
        let fut = schalterClient.post(shalterUnlockUrl)
        fut.addCallback do ():
          bot.typing(f, false)
          if fut.failed:
            reply("unlock failed")
          else:
            reply(fut.read.status)
    except:
      reply(getCurrentExceptionMsg())

  bot.onFileChunkRequest do (friend: Friend; file: FileTransfer; pos: uint64; size: int):
    if size != 0:
      asyncCheck bot.sendAvatarChunk(friend, file, pos, size)

proc newBot(name: string): Tox =
  result = newTox do (opts: Options):
    opts.localDiscoveryEnabled = true
    opts.ipv6Enabled = true
    if existsFile saveFileName:
      opts.saveDataType = TOX_SAVEDATA_TYPE_TOX_SAVE
      opts.savedata = readFile(saveFileName)

  result.name = name
  result.setup()
  for id in adminIds: result.addAdmin(id)
  result.bootstrap()
  echo result.name, " is at ", result.address

proc main() =
  let bot = newBot("HQ Bot")
  writeFile(saveFileName, bot.saveData)
  echo "DHT port and key: ", bot.udpPort, " ", bot.dhtId

  while true:
    iterate bot
    poll bot.iterationInterval

main()