@startuml

skinparam ClassAttributeIconSize 0

hide circle
hide empty member

main -> "<u>context</u>\n<u>:Context</u>" : <<create>>
"<u>context</u>\n<u>:Context</u>" -> "<u>the_beginning_of_the_day</u>\n<u>:TheBeginningOfTheDay</u>" : <<create>>
"<u>context</u>\n<u>:Context</u>" -> "<u>the_end_of_the_day</u>\n<u>:TheEndOfTheDay</u>" : <<create>>
"<u>context</u>\n<u>:Context</u>" -> "<u>context</u>\n<u>:Context</u>" : state = the_beginning_of_the_day

group state:the_beginning_of_the_day
  main -> "<u>context</u>\n<u>:Context</u>" : context.action()
  "<u>context</u>\n<u>:Context</u>" -> "<u>the_beginning_of_the_day</u>\n<u>:TheBeginningOfTheDay</u>" : the_beginning_of_the_day.action()
  main -> "<u>context</u>\n<u>:Context</u>" : context.greeting()
  "<u>context</u>\n<u>:Context</u>" -> "<u>the_beginning_of_the_day</u>\n<u>:TheBeginningOfTheDay</u>" : the_beginning_of_the_day.greeting()
end

main -> "<u>context</u>\n<u>:Context</u>" : context.change_state()
"<u>context</u>\n<u>:Context</u>" -> "<u>context</u>\n<u>:Context</u>" : state = the_end_of_the_day

group state:the_end_of_the_day
  main -> "<u>context</u>\n<u>:Context</u>" : context.greeting()
  "<u>context</u>\n<u>:Context</u>" -> "<u>the_end_of_the_day</u>\n<u>:TheEndOfTheDay</u>" : the_end_of_the_day.greeting()
  main -> "<u>context</u>\n<u>:Context</u>" : context.action()
  "<u>context</u>\n<u>:Context</u>" -> "<u>the_end_of_the_day</u>\n<u>:TheEndOfTheDay</u>" : the_end_of_the_day.action()
end

@enduml