Reactor Control

-- Reactor name appears center of screen.
local reactorTitle = "Reactor Core #01"

-- Reactor menu options
local menu_options =
{
    [1] = {menuOption="Reactor:", option1="  ON  ", option2="  OFF ", yPos=8, option1xPos=22, option2xPos=31, selected=2},
    [2] = {menuOption="Lights:", option1="  ON  ", option2="  OFF ", yPos=9, option1xPos=22, option2xPos=31, selected=2},
    [3] = {menuOption="Info Displays:", option1="  ON  ", option2="  OFF ", yPos=10, option1xPos=22, option2xPos=31, selected=2},
    [4] = {menuOption="Emerg. Flood:", option1="  ON  ", option2="  OFF ", yPos=11, option1xPos=22, option2xPos=31, selected=2},
    [5] = {menuOption="Access Doors:", option1=" OPEN ", option2="CLOSED", yPos=12, option1xPos=22, option2xPos=31, selected=2},
    [6] = {menuOption="", option1="Emergency Shutdown", option2="", yPos=16, option1xPos=17, option2xPos=0, selected=0},
}

-- Clear Screen
term.clear()

-- FUNCTION (Draw Menu)
local function drawMenu()
    for index, data in pairs(menu_options) do
        term.setCursorPos(data.option1xPos-2-data.menuOption:len(), data.yPos)
        term.setBackgroundColor(colors.black)
        term.write(data.menuOption)

        term.setCursorPos(data.option1xPos, data.yPos)
        if data.selected == 1 then
            term.setBackgroundColor(colors.green)
        elseif data.selected == 0 then
            term.setBackgroundColor(colors.red)
        else
            term.setBackgroundColor(colors.gray)
        end
        term.write(data.option1)

        term.setCursorPos(data.option2xPos, data.yPos)
        if data.selected == 2 then
            term.setBackgroundColor(colors.red)
        elseif data.selected == 0 then
            term.setBackgroundColor(colors.red)
        else
            term.setBackgroundColor(colors.gray)
        end
        term.write(data.option2)
    end
end

drawMenu()

-- FUNCTION (Center Text)
local function centerText(text)
    term.setCursorPos(1,3)
    local x,y = term.getSize()
    local x2,y2 = term.getCursorPos()
    term.setCursorPos(math.ceil((x / 2) - (text:len() / 2)), y2)
    term.setBackgroundColor(colors.black)
    write(text)
end

centerText(reactorTitle)

local function checkClick(x,y)
    for index, data in pairs(menu_options) do
        if x > data.option1xPos and x < data.option1:len() + data.option1xPos and y == data.yPos then
            if data.selected ~= 0 then
                return index, 1
            else
                return index, 0
            end
        end

        if x > data.option2xPos and x < data.option2:len() + data.option2xPos and y == data.yPos then
            if data.selected ~= 0 then
                return index, 2
            else
                return index, 0
            end
        end
    end
    return false, false
end

while true do
    local e = {os.pullEvent()}
    local indexSelected, optionSelected = "", ""

    if e[1] == "mouse_click" then
        indexSelected, optionSelected = checkClick(e[3], e[4]) --Check the mouse click

        if indexSelected ~= false and optionSelected ~= false then
            menu_options[indexSelected].selected = optionSelected
        end
    end

    term.setCursorPos(1,19)
    term.setBackgroundColor(colors.black)

    if optionSelected == 1 then
        term.write(menu_options[indexSelected].menuOption .. " " .. menu_options[indexSelected].option1 .. "             ")
    elseif optionSelected == 2 then
        term.write(menu_options[indexSelected].menuOption .. " " .. menu_options[indexSelected].option2 .. "             ")
    elseif optionSelected == 0 then
        term.write(menu_options[indexSelected].menuOption .. " " .. menu_options[indexSelected].option1 .. " " .. menu_options[indexSelected].option2 .. "             ")
    end

    -- Put button actions below
    if indexSelected == 1 and optionSelected == 1 then     -- Reactor On

    elseif indexSelected == 1 and optionSelected == 2 then -- Reactor Off

    elseif indexSelected == 2 and optionSelected == 1 then -- Lights On

    elseif indexSelected == 2 and optionSelected == 2 then -- Lights Off

    elseif indexSelected == 3 and optionSelected == 1 then -- Info Displays ON

    elseif indexSelected == 3 and optionSelected == 2 then -- Info Displays OFF

    elseif indexSelected == 4 and optionSelected == 1 then -- Access Doors On

    elseif indexSelected == 4 and optionSelected == 2 then -- Access Doors Off

    elseif indexSelected == 4 and optionSelected == 0 then -- Emergency Shutdown

    end

    drawMenu()
end