lua/last.lua

-- put this script in startup/
-- install morefonts in /
-- also ask me for a sanjuuni.sad.ovh password or selfhost it
-- change the last.fm username in checkTrack, and my name in doLastfm
-- https://git.sad.ovh/sophie/convert

local mf = require("../morefonts")

local function drawImage(monitor, image, dx, dy, palette)
    if image == nil then
      printError('Image passed to drawImage was nil.')
      return
    end
    frame = image[1]
--    for _, frame in ipairs(image) do
        for y, row in ipairs(frame) do
            monitor.setCursorPos(dx+1, dy+y)
            monitor.blit(table.unpack(row))
        end
        if frame.palette then for i = 0, #frame.palette do
            local c = frame.palette[i]
            if type(c) == "table" then monitor.setPaletteColor(2^i, table.unpack(c))
            else monitor.setPaletteColor(2^i, c) end
        end end
        if image.animation then sleep(frame.duration or image.secondsPerFrame or 0.05) end
--    end
    monitor.setBackgroundColor(colors.black)
    monitor.setTextColor(colors.white)
    monitor.setCursorPos(1, 1)
end

local function playAudio(title, artist)
  if title == '' or artist == '' then
    print("empty 'audio' sent out")
    return
  end

  local audioReq = http.post({
      url = "https://sanjuuni.sad.ovh/youtube",
      body = textutils.serialiseJSON({
        ["title"] = title,
        ["artist"] = artist
      }),
      headers = {
          ["Content-Type"] = "application/json",
          ["Authorization"] = "<..>"
      }
  })

  if audioReq == nil then -- usually works on the second one, not sure what's broken
    audioReq = http.post({
      url = "https://sanjuuni.sad.ovh/youtube",
      body = textutils.serialiseJSON({
        ["title"] = title,
        ["artist"] = artist
      }),
      headers = {
          ["Content-Type"] = "application/json",
          ["Authorization"] = "<..>"
      }
    })
  end

  local speaker = peripheral.find("speaker")

  local decoder = require("cc.audio.dfpwm").make_decoder()
  local play = true

  parallel.waitForAny(
    function ()
      while decoder do
        local chunk = audioReq.read(16 * 1024)
        if not chunk then break end
        local decoded = decoder(chunk)
        while not speaker.playAudio(decoded) do
          os.pullEvent("speaker_audio_empty")
        end
      end
    end,
    function ()
      while play do
        event, title, artist = os.pullEvent("audio")
        os.queueEvent("audio", title, artist)
        print("play = false")
        play = false
      end
    end
  )
end
local function doLastfm(track)
  if not track["@attr"] then
      local monitor = peripheral.find("monitor")
      local width, height = monitor.getSize()
      monitor.clear()
      os.queueEvent('audio', '', '')

      mf.writeOn(monitor, "Nothing is being played.", nil, nil, {font="Dogica",anchorHor="center",anchorVer="center", wrapWidth = 2 * width})
    return
  end

  local artist = track["artist"]["#text"]
  local album = track["album"]["#text"]
  local title = track["name"]

  os.queueEvent('audio', title, artist)
  print('Displaying ' .. artist .. ' - ' .. title .. ' (on ' .. album ..')')
  local image = track["image"][1]["#text"]

  local imageReq = http.post({
      url = "https://sanjuuni.sad.ovh/render",
      body = textutils.serialiseJSON({
        ["imageUrl"] = image
      }),
      headers = {
          ["Content-Type"] = "application/json",
          ["Authorization"] = "<..>"
      }
  })
  if imageReq == nil then return end

  local monitor = peripheral.find("monitor")
  local width, height = monitor.getSize()
  monitor.clear()

  monitor.setCursorPos(2,2)
  monitor.write("Loading..")

  local data = imageReq.readAll() -- actually read the data.
  monitor.setTextScale(0.5)
  data = textutils.unserialize(data) -- convert the string file data into a usable lua object
  drawImage(monitor, data, 0, 0)

  mf.writeOn(monitor, "Sophie is playing", 20, 4, {font="fonts/3x3-Mono", wrapWidth = 35})
  local _, b = mf.writeOn(monitor, string.sub(title, 1, 14), nil, nil, {font="Dogica", dy = 8, anchorHor = "center", wrapWidth = 2 * width})

  mf.writeOn(monitor, string.sub(artist, 1, 15), nil, nil, {font="Dogica", dy = 11+b, anchorHor = "center", wrapWidth = 2 * width})

end

local lastTrack = nil;
local timer = os.startTimer(1);

local function checkTrack()
  local req = http.get("https://ws.audioscrobbler.com/2.0/?api_key=816cfe50ddeeb73c9987b85de5c19e71&method=User.getrecenttracks&user=yourfriendoss&format=json&limit=1")
  if req == nil then return end
  local rawData = req.readAll();

  local data = textutils.unserialiseJSON(rawData)

  local track = data["recenttracks"]["track"][1];
  if lastTrack ~= nil then
    if lastTrack["name"] == track["name"] then
      return;
    end
  end

  lastTrack = track;
  doLastfm(track)
end

local function updateLastfm()
  while true do
    event, id = os.pullEvent("timer")
    if timer == id then
      checkTrack()
      timer = os.startTimer(1)
    end
  end
end

local function playAudioEvent()
  while true do
    event, title, artist = os.pullEvent("audio")

    parallel.waitForAll(function ()
      playAudio(title, artist)
    end)
  end
end

parallel.waitForAll(updateLastfm, playAudioEvent)