Jukebox script

--18107's Jukebox
--version 1.0
--last updated 01 July 2015
--requires 'project red' or 'computronics'

local monitor = peripheral.find("monitor")
if monitor == nil then
  term.setTextColor(colors.red)
  print("Error: No monitor detected")
  return
end
local modem = peripheral.find("modem")
local musicList = {}
local monitorWidth, monitorHeight = monitor.getSize()
local song = nil
local playing = nil
local songLength, songName, songAuth, origSongAuth, songDesc
local tempo = 1000
local page = 1
local screen = 1
local noteblock = peripheral.find("iron_noteblock")
local instrum = {0, 0, 0, 0, 0}
local repeatMode = "off" -- off, single, all ordered, all random
local finished = false
local refreshCounter = 1
local ticksPlayed = 0
local updateNeeded = false
math.randomseed(os.time())
math.random()

function newLine()
  local x, y = monitor.getCursorPos()
  monitor.setCursorPos(1, y + 1)
end --newline()

function readNumber(file, size) --reads a binary number
  local number = 0
  for siz = 1, size do
    number = number + bit.blshift(file.read(), 8*(siz-1))
  end --for size
  return number
end --readNumber()

function readString(file, length)
  if length == 0 then return end
  local text = string.char(file.read())
  for char = 2, length do
    text = text..string.char(file.read())
  end --for char
  return text
end --readString()

function refreshMusicList()
  local length = #musicList
  local thisSong
  if playing ~= 0 and playing ~= nil then
    thisSong = musicList[playing]
  end --if playing

  local list = fs.list("")
  local disks = {}
  musicList = {}
  local counter = 1
  local counter2 = 1
  for i = 1, #list do
    if string.sub(list[i],-4)==".nbs" then
      musicList[counter] = list[i]
      counter = counter + 1
    elseif string.sub(list[i],0,4) == "disk" and fs.isDir(list[i]) then
      disks[counter2] = list[i]
      counter2 = counter2 + 1
    end --if ".nbs"
  end --for #list

  for a = 1, #disks do
    list = fs.list(disks[a])
    for b = 1, #list do
      if string.sub(list[b],-4)==".nbs" then
        musicList[counter] = disks[a].."/"..list[b]
        counter = counter + 1
      end --if ".nbs"
    end --for #list
  end --for #disks

  if playing ~= 0 and playing ~= nil then
    if thisSong ~= musicList[playing] then
      playing = playing - length + #musicList --FIXME check if this worked
      updateNeeded = true
    end --if thisSong
  end --if playing

  if page > #musicList/(monitorHeight-3) and #musicList > 0 then
    page = math.ceil(#musicList/(monitorHeight-3))
  end --if page
end --refreshMusicList()

function nextSong()
  if playing == 0 or playing == nil then return end

  if repeatMode == "all random" then
    playing = math.random(#musicList)
  else
    if playing >= #musicList then
    playing = 0
  end --if playing == #musicList
  playing = playing + 1
  end --if repeatMode
  page = math.floor((playing-1)/(monitorHeight-3)) + 1
  updateNeeded = true
end --skip()

function displayMusicList(page, playing)
  refreshMusicList()
  monitor.clear()
  monitor.setCursorPos(monitorWidth-4-20, 1)
  monitor.setTextColor(colors.yellow)
  monitor.write("Repeat: "..repeatMode)
  monitor.setCursorPos(1, 1)
  monitor.setTextColor(colors.cyan)
  monitor.write("18107's Juke Box")
  monitor.setCursorPos(monitorWidth-3, 1)
  monitor.setTextColor(colors.red)
  monitor.write("Stop")
  monitor.setTextColor(colors.white)
  newLine()
  if #musicList > 0 then
    for i = (monitorHeight-3)*(page-1)+1, (monitorHeight-3)*(page-1)+monitorHeight-3 do
      if playing == i then monitor.setTextColor(colors.blue) end
      if i <= #musicList then
        if string.sub(musicList[i],0,4) == "disk" then
          if string.sub(musicList[i],5,5) == "/" then
            monitor.write("Disk : "..string.sub(musicList[i],6,-5))
          else
            monitor.write("Disk "..string.sub(musicList[i],5,5).." : "..string.sub(musicList[i],7,-5))
          end --if "/"
        else
          monitor.write(string.sub(musicList[i],0,-5))
        end --if disk/
      end --if #musicList
      if playing == i then monitor.setTextColor(colors.white) end
      newLine()
    end --for 1, 16
  end --if #musicList
  monitor.setCursorPos(1, monitorHeight-1)
  if playing == 0 or playing == nil then
    monitor.setTextColor(colors.lightGray)
  else
    monitor.setTextColor(colors.cyan)
  end --if playing
  monitor.write("Currently Playing")
  monitor.setCursorPos(monitorWidth-3, monitorHeight-1)
  if playing ~= 0 and playing ~= nil then
    monitor.setTextColor(colors.blue)
  end --if playing
  monitor.write("Skip")
  newLine()
  monitor.setTextColor(colors.green)
  monitor.write("Previous")
  monitor.setCursorPos(monitorWidth-3, monitorHeight)
  monitor.write("Next")
  monitor.setCursorPos(monitorWidth/2+1, monitorHeight)
  monitor.setTextColor(colors.yellow)
  monitor.write(tostring(page))
  monitor.setTextColor(colors.white)
end --displayMusicList()

function displayCurrentlyPlaying(playing, full)
  if full then
    monitor.clear()
    monitor.setCursorPos(monitorWidth-4-20, 1)
    monitor.setTextColor(colors.yellow)
    monitor.write("Repeat: "..repeatMode)
    monitor.setCursorPos(1, 1)
    monitor.setTextColor(colors.cyan)
    monitor.write("18107's Juke Box")
    monitor.setCursorPos(monitorWidth-3, 1)
    monitor.setTextColor(colors.red)
    monitor.write("Stop")
    monitor.setTextColor(colors.white)
    newLine()
    newLine()
    if string.sub(musicList[playing], 0, 4) == "disk" then
      if string.sub(musicList[playing], 5, 5) == "/" then
        monitor.write("Disk : "..string.sub(musicList[playing], 6, -5))
      else
        monitor.write("Disk "..string.sub(musicList[playing],5,5).." : "..string.sub(musicList[playing],7,-5))
      end --if "/"
    else
      monitor.write(string.sub(musicList[playing], 0, -5))
    end --if disk/
    newLine()
    newLine()
    if type(songAuth) == "string" then
      monitor.write("Author: "..songAuth)
    end --if string
    newLine()
    newLine()
    if type(origSongAuth) == "string" then
      monitor.write("Original author: "..origSongAuth)
    end --if string
    newLine()
    newLine()
    if type(songDesc) == "string" then
      for desc = 0, #songDesc/monitorWidth+1 do
        monitor.write(string.sub(songDesc, desc*monitorWidth+1, (desc+1)*monitorWidth))
        newLine()
      end --for #songDesc
    end --if string
    monitor.setCursorPos(1, monitorHeight-1)
    monitor.setTextColor(colors.cyan)
    monitor.write("Song list")
    monitor.setCursorPos(monitorWidth-3, monitorHeight-1)
    monitor.setTextColor(colors.blue)
    monitor.write("Skip")
  end --if full

  monitor.setCursorPos(1, monitorHeight)
  monitor.setTextColor(colors.lightGray)
  local minutes = math.floor(ticksPlayed*100/tempo/60)
  local seconds = math.floor(ticksPlayed*100/tempo) % 60
  if minutes < 10 then monitor.write(" ") end
  monitor.write(minutes..":")
  if seconds < 10 then monitor.write("0") end
  monitor.write(seconds.."")

  minutes = math.floor(songLength*100/tempo/60)
  seconds = math.floor(songLength*100/tempo) % 60
  monitor.setCursorPos(monitorWidth-4, monitorHeight)
  if minutes < 10 then monitor.write(" ") end
  monitor.write(minutes..":")
  if seconds < 10 then monitor.write("0") end
  monitor.write(seconds.."")

  monitor.setTextColor(colors.white)
end --displayCurrentlyPlaying()

function header(song)
  local strLen = 0
  songLength = readNumber(song, 2)
  readNumber(song, 2) --song height
  strLen = readNumber(song, 4)
  songName = readString(song, strLen)
  strLen = readNumber(song, 4)
  songAuth = readString(song, strLen)
  strLen = readNumber(song, 4)
  origSongAuth = readString(song, strLen)
  strLen = readNumber(song, 4)
  songDesc = readString(song, strLen)
  local tempo = readNumber(song, 2)
  readNumber(song, 1) --auto saving
  readNumber(song, 1) --auto saving duration
  readNumber(song, 1) --time signature
  readNumber(song, 4) --minutes spent
  readNumber(song, 4) --left clicks
  readNumber(song, 4) --right clicks
  readNumber(song, 4) --blocks added
  readNumber(song, 4) --blocks removed
  strLen = readNumber(song, 4)
  readString(song, strLen) --MIDI/schematic file name
  return tempo
end --header()

function playSong(number)
  while true do --coroutine loop
    if song ~= nil then song.close() end
    if number == 0 then number = nil end
    while number == nil do
      number = coroutine.yield()
      if number == 0 then number = nil end
    end -- while number == nil
    song = fs.open(musicList[number], "rb")
    if song == nil then
      print("File not found")
      break
    end --if nil

    tempo = header(song)

    ticksPlayed = -1
    local nextTick = 0
    local instrument = 0
    local key = 0
    local running = true
    while running do --song loop
      nextTick = readNumber(song, 2)
      -- if end of file
      if nextTick == 0 or nextTick == nil then
        finished = true
        break
      end --if nextTick
      for tick = 1, nextTick do --wait for next note
        ticksPlayed = ticksPlayed + 1
        number = coroutine.yield()
        if number ~= nil then running = false break end
      end --for tick

      while readNumber(song, 2) ~= 0 do --play chord
        instrument = readNumber(song, 1)
        key = readNumber(song, 1)
        instrum[instrument+1] = bit.bor(instrum[instrument+1], bit.blshift(1, key-33))
        playNote(instrument, key-33)
      end --while chord
      transmitNote()
      instrum = {0, 0, 0, 0, 0}
    end --while song loop
    song = nil
  end --while coroutine loop
end --playSong()

function transmitNote()
  if modem == nil then return end
  for instrument = 1, 5 do
    modem.transmit(instrument, 0, instrum[instrument])
  end --for instrument
end --transmitNote()

function playNote(type, key)
  if noteblock == nil then return end
  if type == 0 then noteblock.playNote(0, key)
  elseif type == 1 then noteblock.playNote(4, key)
  elseif type == 2 then noteblock.playNote(1, key)
  elseif type == 3 then noteblock.playNote(2, key)
  else noteblock.playNote(3, key) end
end

displayMusicList(page)
local play = coroutine.create(playSong)
local arg = nil
local event, side, x, y
os.startTimer(0.1)
while coroutine.status(play) ~= "dead" do
  event, side, x, y = os.pullEventRaw()

  if updateNeeded then
    updateNeeded = false
    if screen == 1 then
      displayMusicList(page, playing)
    elseif screen == 2 then
      displayCurrentlyPlaying(playing, true)
    end --if screen
  end --if update

  if event == "terminate" then
    monitor.clear()
    return
  end --if terminate

  if event == "timer" then
    os.startTimer(100/tempo)
    if finished then
      finished = false
      if repeatMode == "single" then
        arg = playing
      elseif repeatMode == "off" then
        screen = 1
        playing = nil
        tempo = 100 -- slow timer
        refreshCounter = 0
      else
        nextSong()
    arg = playing
      end -- if repeatMode
    if screen == 1 then
        displayMusicList(page, playing)
      elseif screen == 2 then
        displayCurrentlyPlaying(playing, true)
      end --if screen
    end -- if finished

    if refreshCounter <= 0 then
      refreshCounter = 100
      if screen == 1 then
        displayMusicList(page, playing)
      elseif screen == 2 then
        displayCurrentlyPlaying(playing, true)
      end -- if screen
    end -- if refreshCounter
    refreshCounter = refreshCounter - 1
    if screen == 2 then
      displayCurrentlyPlaying(playing, false)
    end --if screen
    coroutine.resume(play, arg)
  end
  arg = nil

  if event == "monitor_touch" then
    if screen == 1 then
      if y > 1 and y < monitorHeight-1 then
        -- select song
        arg = (y-1)+(page-1)*(monitorHeight-3)
        playing = arg
        displayMusicList(page, playing)
      elseif y == monitorHeight-1 then
      if x <= 17 then
          -- currently playing
          if playing ~= 0 and playing ~= nil then
            screen = 2
            displayCurrentlyPlaying(playing, true)
          end --if playing
    elseif x >= monitorWidth-3 then
      nextSong()
      arg = playing
      displayMusicList(page, playing)
      coroutine.resume(play, arg)
    end --if monitorHeight-1
      elseif y == monitorHeight then
        -- previous, next
        if x < 9 then
          page = page - 1
          if page <= 0 then page = 1 end
          displayMusicList(page, playing)
        elseif x > monitorWidth-4 then
          if page*(monitorHeight-3) < #musicList then
            page = page + 1
          end --if page
          displayMusicList(page, playing)
        end --if x
      else --if y
        -- top line
        if x > monitorWidth-4 then
          arg = 0
          playing = arg
          displayMusicList(page, playing)
        elseif x > 16 and x <= monitorWidth-6 then
          if repeatMode == "off" then
            repeatMode = "single"
          elseif repeatMode == "single" then
            repeatMode = "all ordered"
          elseif repeatMode == "all ordered" then
            repeatMode = "all random"
          else -- if repeatMode == "all random"
            repeatMode = "off"
          end -- if repeatMode
          displayMusicList(page, playing)
        end --if x
      end --if y
    elseif screen == 2 then
      if y == monitorHeight-1 then
        if x <= 9 then
          -- song list
          screen = 1
          displayMusicList(page, playing)
        elseif x >= monitorWidth-3 then
          nextSong()
      arg = playing
      displayCurrentlyPlaying(playing, true)
      coroutine.resume(play, arg)
        end --if x
      elseif y == 1 then
        if x > monitorWidth-4 then
        -- stop
        arg = 0
        playing = arg
        screen = 1
        displayMusicList(page, playing)
        elseif x > 16 and x <= monitorWidth-6 then
          if repeatMode == "off" then
            repeatMode = "single"
          elseif repeatMode == "single" then
            repeatMode = "all ordered"
          elseif repeatMode == "all ordered" then
            repeatMode = "all random"
          else -- if repeatMode == "all random"
            repeatMode = "off"
          end -- if repeatMode
          displayCurrentlyPlaying(playing, true)
        end
      end --if y
    end --if screen == 1
  end --monitor touch

  if event == "peripheral" or event == "peripheral_detach" or event == "monitor_resize" then
    modem = peripheral.find("modem")
    monitor = peripheral.find("monitor")
    if monitor == nil then
      term.setTextColor(colors.red)
      print("Error: monitor detached")
      return
    end
    noteblock = peripheral.find("iron_noteblock")
    monitorWidth, monitorHeight = monitor.getSize()
    if screen == 1 then
      displayMusicList(page, playing)
    elseif screen == 2 then
      displayCurrentlyPlaying(playing, true)
    end
  end --if peripheral

  if event == "disk" then
    refreshMusicList()
    updateNeeded = true
  end --if disk

  if event == "disk_eject" then
    if playing ~= 0 and playing ~= nil then
      local length = #musicList
      local thisSong = musicList[playing]
      if string.sub(thisSong, 0, 4) == "disk" then
        if string.sub(thisSong, 5, 5) == "/" then
          if fs.isDir("disk") == false then
            arg = 0
          end --if isDir
        else
          if fs.isDir("disk"..string.sub(thisSong, 5, 5)) == false then
            arg = 0
          end --if isDir
        end --if "/"
      end --if playing disk

      refreshMusicList()
      updateNeeded = true

      if arg == 0 then
        playing = arg
        if screen == 2 then
          screen = 1
        end
        coroutine.resume(play, arg)
      end --if arg
    else --if playing
      refreshMusicList()
      updateNeeded = true
    end --if playing
  end -- if disk_eject
end --while coroutine