Automate Change of Screen Brightness

#!/bin/lua

function NightModeExtreme()
    return {
        apply = function(self)
            os.execute("sct 1500")
            os.execute("brightnessctl set 1%")
        end,
    }
end

function NightModeNormal()
    return {
        apply = function(self)
            os.execute("sct 3000")
            os.execute("brightnessctl set 1%")
        end,
    }
end

function NormalMode()
    return {
        applyWithBrightnessAt = function(self, brightness)
            os.execute("sct 6500")
            os.execute("brightnessctl set " .. brightness .. "%")
        end,
    }
end

function AvailableModes(modes)
    return {
        apply = function(self, modeRequest)
            if modeRequest == "Extreme Night Mode" then
                modes.NightModes[2]:apply()
            elseif modeRequest == "Normal Night Mode" then
                modes.NightModes[1]:apply()
            elseif type(modeRequest) == "table" and modeRequest.Mode == "Normal Mode" then
                modes.NormalModes[1]:applyWithBrightnessAt(modeRequest.Brightness)
            end
        end,
    }
end

function DisplayMode(acceptableDisplayModes)
    return {
        providedByUser = function(self)
            local userDisplayMode = self:displayModeRequestedByUser()
            local displayModes = self:displayModes()
            return self:displayModeChosenByUser(displayModes, userDisplayMode)
        end,

        displayModeRequestedByUser = function(self)
            local handle = io.popen("echo '' | dmenu -p \"displayMode:\"")
            local input = handle:read("*a")
            handle:close()
            return input:gsub("\n$", "")
        end,

        displayModes = function(self)
            return {
                { nn = "Normal Night Mode" },
                { ne = "Extreme Night Mode" },
                { n18 = "NightMode, 18" },
                { d80 = "Normal Mode, 80" },
            }
        end,

        displayModeChosenByUser = function(self, displayModes, userInputFromDmenu)
            for i, mode in ipairs(displayModes) do
                for key, value in pairs(mode) do
                    if key == userInputFromDmenu then
                        return value
                    end
                end
            end
            if string.sub(userInputFromDmenu, 1, 1) == "d" then
                return "Normal Mode " .. string.sub(userInputFromDmenu, 2)
            elseif string.sub(userInputFromDmenu, 1, 1) == "n" then
                return "Night Mode " .. string.sub(userInputFromDmenu, 2)
            end
            return nil
        end,
    }
end

function PrimaryDisplay(availableModes)
    return {
        changeAccordingTo = function(self, userMode)
            self:activateUserChosenDisplay(userMode)
        end,

        activateUserChosenDisplay = function(self, userMode)
            local userInput = userMode:providedByUser()
            if userInput == "Extreme Night Mode" then
                availableModes:apply(userInput)
            elseif userInput == "Normal Night Mode" then
                availableModes:apply(userInput)
            elseif string.sub(userInput, 1, 11) == "Normal Mode" then
                local brightnessValue = tonumber(string.sub(userInput, 13))
                availableModes:apply({ Mode = "Normal Mode", Brightness = brightnessValue })
            elseif string.sub(userInput, 1, 10) == "Night Mode" then
                local warmthValue = tonumber(string.sub(userInput, 12)) * 100
                availableModes:apply({ Mode = "Night Mode", Warmth = warmthValue })
            end
        end,
    }
end

local modes = {
    NightModes = {
        NightModeNormal(),
        NightModeExtreme(),
    },
    NormalModes = {
        NormalMode(),
    },
}

local availableModes = AvailableModes(modes)
local displayMode = DisplayMode()
local primaryDisplay = PrimaryDisplay(availableModes)
primaryDisplay:changeAccordingTo(displayMode)
os.exit(0)