@startuml titlescreen startup
!theme materia-outline
skinparam DefaultFontName Courier
skinparam Shadowing false

participant usc
participant "titlescreen.lua" as main
collections screens
collections pages

usc -> main : load titlescreen.lua

activate main

group construct screens
    main -> screens : create
    screens -> pages : create
    screens -> pages : set callbacks
    main -> screens : set callbacks
    main -> usc : get persistent states
    main <-- usc
    main -> screens : load persistent previous state values
end

main -> usc : get last screen value
main <-- usc

main -> main : set last screen value as current screen

main -> screens : call current screen's init()

activate screens

screens -> usc : set current screen as last screen value

screens -> pages : init()
activate pages

loop main render loop
    main -> screens : call current screen's render()
    activate screens
    screens -> pages : render()
    activate pages
    deactivate screens
    deactivate pages
end

@enduml