@startuml team-create-activity
title CR-Core — Create Team (activity diagram)

start

:Player runs /team create <name> <tag> <color> [visibility];

if (Name already in use?) then (yes)
  :Reply "team name already taken";
  stop
else (no)
endif

if (Tag already in use?) then (yes)
  :Reply "team tag already taken";
  stop
else (no)
endif

if (Player already in a team?) then (yes)
  :Reply "you already belong to a team";
  stop
else (no)
endif

if (Color valid?) then (no)
  :Reply "unknown color";
  stop
else (yes)
endif

:Create Team(id = randomUUID, name, tag, color, leaderId = playerId, visibility);
note right: visibility defaults to PRIVATE\nif not specified
:Add player as TeamMember(role = LEADER);
:Persist via TeamRepository.save(team);
:Reply "team created";

stop

@enduml