MIN_VALUE = -99
MAX_VALUE = 999
val = 0

function onSave() return JSON.encode(val) end

function onLoad(saved_data)
    if saved_data ~= nil then
        val = JSON.decode(saved_data)
    end

    self.createButton({
        label = tostring(val),
        click_function = "addOrSubtract",
        function_owner = self,
        position = { 0, 0.06, 0 },
        height = 600,
        width = 1000,
        scale = { 1.5, 1.5, 1.5 },
        font_size = 600,
        font_color = { 1, 1, 1, 100 },
        color = { 0, 0, 0, 0 }
    })
end

function updateVal(newVal)
    if tonumber(newVal) then
        val = newVal
        self.editButton({
            index = 0,
            label = tostring(val)
        })
    end
end

function addOrSubtract(_, _, alt_click)
    val = math.min(math.max(val + (alt_click and -1 or 1), MIN_VALUE), MAX_VALUE)
    self.editButton({ index = 0, label = tostring(val) })
end