grinders

local mon = peripheral.wrap("top")

buttons = {}

function print()
  mon.clear()
  mon.setTextScale(1)

  mon.setCursorPos(22, 2)
  mon.write("Grinders")

  mon.setCursorPos(9, 5)
  mon.write("Left Grinder")

  mon.setCursorPos(30, 5)
  mon.write("Right Grinder")

  printbutton("leftLight")
  printbutton("rightLight")
end

function newbutton(name, text, func, xmin, xmax, ymin, ymax)
  buttons[name] = {}
  buttons[name]["text"] = text
  buttons[name]["func"] = func
  buttons[name]["xmin"] = xmin
  buttons[name]["xmax"] = xmax
  buttons[name]["ymin"] = ymin
  buttons[name]["ymax"] = ymax
  buttons[name]["active"] = true
end

function printbutton(name)
  if (buttons[name]["active"]) then
    mon.setBackgroundColor(colors.lime)
  else
    mon.setBackgroundColor(colors.red)
  end

  for i = buttons[name]["ymin"], buttons[name]["ymax"], 1 do
    mon.setCursorPos(buttons[name]["xmin"], i)

    for i = buttons[name]["xmin"], buttons[name]["xmax"], 1 do
      mon.write(" ")
    end
  end

  xstart = buttons[name]["xmin"] + 1 + math.floor((buttons[name]["xmax"] - buttons[name]["xmin"] - string.len(buttons[name]["text"])) / 2)
  ystart = buttons[name]["ymin"] + math.floor((buttons[name]["ymax"] - buttons[name]["ymin"]) / 2)

  mon.setCursorPos(xstart, ystart)
  mon.write(buttons[name]["text"])

  mon.setBackgroundColor(colors.black)
end

function getClick()
  event, side, x, y = os.pullEvent("monitor_touch")

  for name, data in pairs(buttons) do
    if y <= data["ymax"] and y >= data["ymin"] then
      if x <= data["xmax"] and y >= data["xmin"] then
        data["func"]()
      end
    end
  end

  print()
end

function lLight()
  buttons["leftLight"]["active"] = not buttons["leftLight"]["active"]
end

function rLight()
  buttons["rightLight"]["active"] = not buttons["rightLight"]["active"]
end

function update()
  if buttons["leftLight"]["active"] == true and buttons["rightLight"]["active"] == true then
    rs.setOutput("left", true)
    rs.setOutput("back", true)
  elseif buttons["leftLight"]["active"] == true and buttons["rightLight"]["active"] == false then
    rs.setOutput("back", true)
    rs.setOutput("left", false)
  elseif buttons["rightLight"]["active"] == true and buttons["leftLight"]["active"] == false then
    rs.setOutput("back", false)
    rs.setOutput("left", true)
  else
    rs.setOutput("left", false)
    rs.setOutput("back", false)
  end
end

buttons = {}

newbutton("leftLight", "Light", lLight, 9, 21, 7, 9)
newbutton("rightLight", "Light", rLight, 30, 42, 7, 9)

while true do
  print()
  update()
  getClick()
end