Stargate Control 2

interfaceName = "stargate_0"
stargate = peripheral.wrap(interfaceName)

term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)

local addressFileName = "addresses"

local showRow = 0

function saveAddresses(addresses)
    local file = fs.open(addressFileName,"w")
    file.write(textutils.serialize(addresses))
    file.close()
end

function loadAddresses()
    local file = fs.open(addressFileName,"r")
    local data = file.readAll()
    file.close()
    return textutils.unserialize(data)
end

local addresses = loadAddresses()
if addresses == nil then addresses = {} end
local functions = { "Dial", "Add Address", "Edit Address", "Remove Address", "Toggle Iris" }

function addAddress(name, address)
    if addresses[name] ~= nil then return false end
    addresses[name] = address
    saveAddresses(addresses)
    return true
end

function removeAddress(name)
    if addresses[name] ~= nil then
        addresses[name] = nil
    end
    saveAddresses(addresses)
end

function drawBg(file)
    term.clear()

    local bg = paintutils.loadImage(file)
    paintutils.drawImage(bg, 1, 1)

    term.setCursorPos(1,1)
    term.write("Fort Dusk Stargate Control")
end

function drawMenu()
    drawBg("bg.nfp")
    local options = { "Dial", "Edit Addresses", "Toggle Iris" }

    local buttonWidth = 16
    for i = 1, 3, 1 do
        term.setCursorPos(20 + (buttonWidth / 2 - #options[i] / 2), 7 + ((i - 1) * 4))
        term.write(options[i])
    end
end

function drawButton(column1, row)
    local x = if column1 then 6 else 30 end
    local y = 4 + ((row - 1) * 3)
    paintutils.drawPixel(x, y, 5)
    paintutils.drawPixel(x + 1, y, 8)
    paintutils.drawPixel(x + 2, y, 8)

    term.setCursorPos(x + 4, y)
end

function getAddressNames()
    local names = {}
    for name, _ in pairs(addresses) do
        table.insert(names, name)
    end

    return names
end

local maxAddress = 5
function drawSelectMenu()
    drawBg("address.nfp")

    local names = getAddressNames()

    -- Up and down
    term.setCursorPos(3,3)
    term.write('^')
    term.setCursorPos(3,18)
    term.write('v')

    -- Back button
    term.setCursorPos(42, 2)
    term.write(< Back)

    local column1 = true
    for i = 1 + (2 * showRow), #names, 1, do
        drawButton(column1, math.floor((i - (2 * showRow)) / 2))
        term.write(names[i])
        column1 = not column1
    end
end

drawSelectMenu()