sqDiaATM.puml

/'
model the End to End UX (in as much details as possible) 
for withdrawing cash in an atm.
    
actors: consumer, ATM, bank
'/

@startuml Consumer UX at an ATM withdrawl
actor Consumer #green
actor ATM #blue
actor Bank #red

...
Consumer -> ATM: 
... Wait for ATM to be online and available ...

Consumer -> ATM: Insert Card

alt successful card read
    ATM --> Consumer: Present Options

    group Withdrawl
        Consumer -> ATM: Withdraw
        ATM --> Consumer: Amount to withdraw
        loop 5 times
            ATM --> Consumer: Enter PIN
            Consumer -> ATM: PIN
            ATM -> Bank: Verify PIN
            alt verified
                Bank --> ATM: PIN verified
                ATM --> Consumer: Enter Amount
                Consumer -> ATM: Amount
                alt has required cash
                    ATM --> Bank: Propose withdrawl
                    Bank -> Bank: Validate withdrawl request
                    Bank -> Bank: Record request transaction
                    alt accepted
                        Bank --> ATM: Allow withdrawl
                        Bank -> Bank: Record allowed transaction
                        alt dispensed
                            ATM -> ATM: Dispense cash
                            ATM --> Bank: Ack dispense
                            Bank -> Bank: Record withdraw transaction
                            ATM --> Consumer: Display a/c balance
                        else no cash
                            ATM --> Bank: Report error
                            Bank -> Bank: Record transaction error
                            ATM --> Consumer: Display error
                        end
                    else rejected
                        Bank --> ATM: Rejected with Error
                        ATM --> Consumer: Error Message Displayed
                    end
                else no cash or denomination
                    ATM --> Consumer: Display error
                    ATM --> Bank: Notify error
                    Bank -> Bank: Log error
                end 
            else not verified
                Bank -> Bank: Record error transaction
                Bank --> ATM: PIN not verified
                ATM --> Consumer: Retry PIN
            end
        end
            ATM --> Consumer: Card Blocked. Please visit Bank or try after an hour.
    end

else card not read
    ATM --> Consumer: Please re-insert Card
end

@enduml