@startuml

box User (Untrusted)
    participant User
    participant "Game Client" as Game
    participant "DLL Bind" as DllBind
    participant "Windows Registry" as Registry
end box

box Official Infrastructure (Trusted) #LightBlue
    participant "Renegade X Website" as AuthServer
end box

User -> Game: Launch
Game -> User: Loading Screen (intro video)
group Validate Cached AuthID
    Game -> DllBind: StartVerifyCachedAuthID()
    DllBind -> Registry: Read AuthToken
    activate Registry
    return AuthToken value
    alt AuthToken exists
        DllBind -> AuthServer: Validate AuthID Request
        DllBind -> Game: True (Request started)
        loop Wait for response
            Game -> DllBind: CheckAuthRequest()
            DllBind --> Game: RequestInProgress
        end
        alt Authentication success
            AuthServer --> DllBind: Authentication Token, ID
            Game -> DllBind: CheckAuthRequest()
            DllBind --> Game: Success
            Game -> User: Go to main menu / join server
        else Authentication failed
            AuthServer --> DllBind: Authentication Failed
            Game -> DllBind: CheckAuthRequest()
            DllBind --> Game: Failure
            Game -> User: Go to Login Screen
        else Authentication Server Offline / No Response
            Game -> DllBind: CheckAuthRequest()
            DllBind --> Game: Timeout
            Game -> User: "Unable to login; continue anyways?"
            alt User clicks 'Yes'
                User -> Game: Yes
                Game -> User: Go to main menu / join server
            else User clicks 'Exit'
                User -> Game: Exit
                Game -> Game: Exit
            end
        end
    else
        DllBind -> Game: False (No cached credentials)
        Game -> User: Go to Login
    end
end

group Login
    User -> Game: Login Credentials
    Game -> DllBind: StartLoginRequest()
    DllBind -> AuthServer: Authentication Request
    DllBind --> Game

    loop Wait for response
        Game -> DllBind: CheckAuthRequest()
        DllBind --> Game: RequestInProgress
    end

    alt Authentication Success
        AuthServer --> DllBind: Authentication Token, UserID
        opt Remember Me Checkbox Checked
            DllBind -> Registry: Store AuthID, UserID
            activate Registry
            return
        end

        Game -> DllBind: CheckAuthRequest()
        DllBind --> Game: Success
        Game --> User: Login Success; go to main menu / join server
    else Authentication Failure
        AuthServer --> DllBind: Authentication Failed
        Game -> DllBind: CheckAuthRequest()
        DllBind --> Game: Failure
        Game --> User: Display error; repeat Login
    else Authentication Server Offline / No Response
        Game -> DllBind: CheckAuthRequest()
        DllBind --> Game: Timeout
        Game -> User: "Unable to login; continue anyways?"
        alt User clicks 'Yes'
            User -> Game: Yes
            Game -> User: Go to main menu / join server
        else User clicks 'Exit'
            Game -> Game: Exit
        end
    end
end

@enduml