[CCPDA] Redstone controller

function updateOutputs()
    redstone.setOutput("back", out[1])
    redstone.setOutput("left", out[2])
    redstone.setOutput("right", out[3])
    redstone.setOutput("front", out[4])
end

function boolToStr(b)
    if b == true then
        return "true"
    else
        return "false"
    end
end

gui = peripheral.wrap("top")
gui.registerAsEventListener()

out = {false, false, false, false}
button = {0,0,0,0}

updateOutputs()

gui.createGui()


while true do
  a = os.pullEvent()
  if a == "PDA_Use" then
    gui.displayGui()
    gui.addCenText("Redstone Output Control", math.floor(gui.getWidth() / 2), 10, -1)
    button[1] = gui.addButton(1, math.floor(gui.getWidth() / 4), 30, math.floor(gui.getWidth() / 2), 20, "")
    button[2] = gui.addButton(2, math.floor(gui.getWidth() / 4), 60, math.floor(gui.getWidth() / 2), 20, "")
    button[3] = gui.addButton(3, math.floor(gui.getWidth() / 4), 90, math.floor(gui.getWidth() / 2), 20, "")
    button[4] = gui.addButton(4, math.floor(gui.getWidth() / 4), 120, math.floor(gui.getWidth() / 2), 20, "")

    gui.setButtonText(button[1], "Back: "..boolToStr(out[1]))
    gui.setButtonText(button[2], "Left: "..boolToStr(out[2]))
    gui.setButtonText(button[3], "Right: "..boolToStr(out[3]))
    gui.setButtonText(button[4], "Front: "..boolToStr(out[4]))

    while gui.isGuiVisible() do
        a, b = os.pullEvent()
        if a == "GUI_ButtonClick" then
            out[b] = not out[b]
            updateOutputs()

            gui.setButtonText(button[1], "Back: "..boolToStr(out[1]))
            gui.setButtonText(button[2], "Left: "..boolToStr(out[2]))
            gui.setButtonText(button[3], "Right: "..boolToStr(out[3]))
            gui.setButtonText(button[4], "Front: "..boolToStr(out[4]))
        end
    end
  end
end