ComputerCraft Miner OS

-- This code is recommended to use together with ComputerCraft Turtle OS!
-- ComputerCraft Miner OS pastebin is sE0AU5up!

if not os.loadAPI("data/ExAPI") then
    term.setCursorPos(1,1)
    print("ExAPI is missing!")
    print("You need to have ExAPI in data folder")
    print("ExAPI pastebin is PTK4hM5g")
    print("If you have pastebin enabled type:")
    print("pastebin get PTK4hM5g data/ExAPI")
    error()
end
if not term.isColor() then
  print("Program requires an advanced computer.")
  return
end
sleep(1)
-- Variables.
w,h = term.getSize()
src = 0
osName = ExAPI.readConfig(1)
backgroundImageNumber = ExAPI.readConfig(2)
clockToggled = tonumber(ExAPI.readConfig(3))
backgroundImage = tostring(ExAPI.randomBackground(backgroundImageNumber))
clockTimer = os.startTimer(1)

-- Tables.
startMenu = {
  "               ",
  "  Turtle Scan  ",
  " Turtle Control",
  " Control Panel ",
  "    Reboot     ",
  "   Shutdown    ",
  "               "
}

extraMenu = {
  "                 ",
  " Edit Background ",
  "     Edit GUI    ",
  "    Rename OS    ",
  "  Add background ",
  "                 "
}

contextMenu = {
  "           ",
  "   Reboot  ",
  "    Exit   ",
  "           "
}

if not ExAPI.getModemSide() then
  ExAPI.clearScreen()
  ExAPI.writeCenter("Please add a modem to this computer",math.floor(h/2))
  term.setCursorPos(1,1)
  error()
end

function drawScreen()
  term.setBackgroundColor(colors.white)
  ExAPI.clearScreen()
  background = paintutils.loadImage("data/backgrounds/.background"..backgroundImage)
  paintutils.drawImage(background,1,1)
  drawTitle()
  drawBottom()
  displayTime()
end

function drawTitle()
  term.setCursorPos(1,1)
  term.setBackgroundColor(colors.blue)
  term.clearLine()
  ExAPI.writeCenter(osName,1)
  ExAPI.writeRight("[Extra]",2,1)
end

function drawBottom()
  term.setCursorPos(1,h)
  term.setBackgroundColor(colors.green)
  term.clearLine()
  term.setCursorPos(1,h-1)
  term.setBackgroundColor(colors.green)
  term.clearLine()
  term.setBackgroundColor(colors.blue)
  ExAPI.writeLeft(" [Start] ",0,h-1)
  ExAPI.writeLeft("         ",0,h)
end

function drawStartMenu()
  term.setBackgroundColor(128)
  for k,v in pairs(startMenu) do
    ExAPI.writeLeft(tostring(v),0,h-#startMenu-2+k)
  end
end

function drawInputBox(name)
  term.setBackgroundColor(colors.blue)
  for i=1,7 do
    ExAPI.writeCenter("                                ",math.floor(h/2-4+i))
  end
  term.setTextColor(colors.red)
  ExAPI.writeCenter(name,h/2-4+1)
  term.setBackgroundColor(128)
  ExAPI.writeCenter("                            ",h/2-4+4)
  term.setCursorPos(w-40,h/2-4+4)
  term.setTextColor(1)
  input = read()
  return input
end

function displayTime()
  if clockToggled == 1 then
    term.setBackgroundColor(colors.green)
    time = textutils.formatTime(os.time(),true)
    ExAPI.writeRight(time,2,h-1)
  end
end

function drawMenu1()
  term.setBackgroundColor(128)
  for k,v in pairs(extraMenu) do
    ExAPI.writeRight(tostring(v),-1,k+1)
  end
end

function drawExtMenu(contextX,contextY)
  term.setBackgroundColor(128)
  for k,v in pairs(contextMenu) do
    term.setCursorPos(contextX,contextY - 1 + k)
    term.write(tostring(v))
  end
end

drawScreen()
while true do
  local event,button,x,y,p5 = os.pullEvent()
  if event == "mouse_click" then
    if src == 0 then
      if x >= 1 and x <= 9 and y >= h-1 and button == 1 then
        src = 1
        drawStartMenu()
      elseif x >= w-9 and x <= w-2 and y == 1 and button == 1 then
        src = 2
        drawMenu1()
      elseif x >= 1 and y >= 2 and button == 2 then
        src = 3
        if x >= w - 11 then
            contextX = w - 11
        end
        if y >= h - 7 then
            contextY = h - 6
        end
        if x <= w - 11 then
            contextX = x
        end
        if y <= h - 4 then
            contextY = y
        end
        drawExtMenu(contextX,contextY)
      end
    elseif src == 1 then
      if x >= 1 and x <= 15 and y == h-3 and button == 1 then
        src = 0
        os.shutdown()
      elseif x >= 1 and x <= 15 and y == h-6 and button == 1 then
        src = 0
        ExAPI.turtleControl()
      elseif x >= 1 and x <= 15 and y == h-4 and button == 1 then
        src = 0
        os.reboot()
      elseif x >= 1 and x <= 15 and y == h-5 and button == 1 then
        src = 0
        ControlPanel()
      elseif x >= 1 and x <= 15 and y == h-7 and button == 1 then
        src = 0
        drawScreen()
        ExAPI.turtleScan()
      else
        src = 0
        drawScreen()
      end
    elseif src == 2 then
      if x >= w-17 and x <= w and y == 3 and button == 1 then
        src = 0
        shell.run("paint","data/backgrounds/.background"..backgroundImage)
        clockTimer = os.startTimer(1)
        drawScreen()
      elseif x >= w-17 and x <= w and y == 4 and button == 1 then
        src = 0
        shell.run("edit","startup")
        clockTimer = os.startTimer(1)
        drawScreen()
      elseif x >= w-17 and x <= w and y == 5 and button == 1 then
        src = 0
        drawScreen()
        value = drawInputBox("Enter OS name")
        ExAPI.editConfig(1,value)
        osName = value
        drawScreen()
      elseif x >= w-17 and x <= w and y == 6 and button == 1 then
        src = 0
        shell.run("paint","data/backgrounds/.background"..tostring(backgroundImageNumber))
        ExAPI.editConfig(2,backgroundImageNumber+1)
        backgroundImageNumber = ExAPI.readConfig(2)
        clockTimer = os.startTimer(1)
        drawScreen()
      else
        src = 0
        drawScreen()
      end
    elseif src == 3 then
      if x >= contextX and x <= contextX + 10 and y == contextY + 1 and button == 1 then
        src = 0
        os.reboot()
      elseif x >= contextX and x <= contextX + 10 and y == contextY + 2 and button == 1 then
        src = 0
        term.setBackgroundColor(colors.black)
        ExAPI.clearScreen()
        error()
      else
        src = 0
        drawScreen()
      end
    end
  elseif event == "timer" then
    if button == clockTimer then
      displayTime()
      clockTimer = os.startTimer(1)
    end
  end
end