@startuml
skinparam BackgroundColor F0F0F0

participant "Service Cellular" as srvclr
participant "Application Manager" as appmgr
participant "ApplicaionDesktop" as appdsktp
participant "PinLockWindow" as pinwin
actor User

    == PIN required - potential race case ==

note left of srvclr
    Cellular side data:
    State: PIN required
    SIM: SIM1
    phone: +48500500500
    attempts: 4
end note
/ note left of appdsktp
    Desktop side state:
    Screen Locked
end note
/ note left of pinwin
    Desktop side data:
    None
end note

[o->srvclr : need PIN1
    activate srvclr
srvclr -> appmgr : ActionMessage{RequestPin1, {SIM1, attempts}} via sys::bus message
    deactivate srvclr
    activate appmgr
    appmgr -> appmgr : translate request to action
    appmgr -> appdsktp : forward action
        activate appdsktp
    deactivate appmgr
        appdsktp -> appdsktp : handle(RequestPinAction) -> queued
        deactivate appdsktp

        ... ...
        appdsktp <- User : Unlock screen
        activate appdsktp

note left of pinwin
    Desktop side data:
    State: PIN required
    SIM: SIM1
    attempts: 4
end note
/ note left of appdsktp
    Desktop side state:
    Screen Unlocked
end note

        appdsktp -> pinwin ** : switchWindow(SIM1, requiredPIN, attempts)
        deactivate appdsktp
            activate pinwin
            pinwin -> pinwin : setVisiblePinRequired
            pinwin <- User : Enters PIN
            pinwin <- User : Confirm
        appdsktp <- pinwin : handlePasscode(pinValue)
        activate appdsktp
            deactivate pinwin
note over srvclr, appdsktp #FFAAAA
    can such situation happen?
end note

[o->srvclr : need PIN2
activate srvclr

note left of srvclr
    Cellular side data:
    State: PIN required
    SIM: SIM2
    phone: +48600600600
    attempts: 4
end note
/ note left of pinwin
    Desktop side data:
    State: PIN required
    SIM: SIM1
    attempts: 4
end note

srvclr -> appmgr : ActionMessage{RequestPin1, {SIM2, attempts}} via sys::bus message
    activate appmgr
deactivate srvclr

srvclr <- appdsktp : PinData(pinValue) via sys::bus message
activate srvclr
        deactivate appdsktp
note left of srvclr #FFAAAA
    how to distinguish message
    old SIM and new SIM
    SIM1/SIM2 might be not enough
    is it possible to SIM1 - SIM1 race?
end note
srvclr -> srvclr : ?ignore?

    appmgr -> appmgr : translate request to action
deactivate srvclr
    appmgr -> appdsktp : forward action
        activate appdsktp
    deactivate appmgr
        appdsktp -> appdsktp : handle(RequestPinAction)

note left of pinwin
    Desktop side data:
    State: PIN required
    SIM: SIM2
    attempts: 4
end note

        appdsktp -> pinwin : switchWindow(SIM2, requiredPIN, attempts)
            activate pinwin
        deactivate appdsktp
            pinwin -> pinwin : rebuild
            pinwin -> pinwin : setVisiblePinRequired
            pinwin <- User : Enters PIN
            pinwin <- User : Confirm
        appdsktp <- pinwin : handlePasscode(pinValue)
        activate appdsktp
            deactivate pinwin
srvclr <- appdsktp : PinData(pinValue) via sys::bus message
activate srvclr
        deactivate appdsktp
srvclr -> srvclr : verification passed
deactivate srvclr
note left of srvclr
    Cellular side data:
    State: PIN unlocked
    SIM: SIM2
    phone: +48600600600
    attempts: 4
end note

[o->srvclr : SIM unlocked
activate srvclr
srvclr -> appmgr : ActionMessage{SimUnlocked, {SIM1}} via sys::bus message
    activate appmgr
deactivate srvclr
    appmgr -> appmgr : translate request to action
    appmgr -> appdsktp : forward action
        activate appdsktp
    deactivate appmgr
        appdsktp -> appdsktp : handle(SimUnlockedAction)
        appdsktp -> pinwin !! : delete
        deactivate appdsktp
note left of pinwin
    Desktop side data:
    None
end note

@enduml