using { /Fortnite.com/Devices }   # Rule 1: real module, opened with using
using { /Verse.org/Simulation }    # needed for agent and @editable

# Rule 6: one focused job — this device only manages a simple win condition
win_tracker := class(creative_device):

    @editable
    WinButton : button_device = button_device{}   # Rule 1: real device type

    WinningScore : int = 1                          # Part 3: a constant
    var CurrentScore : int = 0                      # Part 3: a variable

    OnBegin<override>() : void =                    # Part 4: real startup event
        WinButton.InteractedWithEvent.Subscribe(OnWinPressed)  # Rule 1 + Part 4

    # Rule 5: changes state, so <transacts>; validate before acting
    OnWinPressed(Agent : agent)<transacts> : void =
        if (CurrentScore < WinningScore):          # Rule 4: check first
            set CurrentScore += 1                   # then change state
            Print("We have a winner!")             # Rule 7: leave a trail