using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
using { /UnrealEngine.com/Temporary/Diagnostics }
using { /Verse.org/Colors }

# This is our main device. It controls the door.
# It watches a trigger_device and changes a
# customizable_light_device to simulate a glowing door.
glowing_door_device := class(creative_device):

    # A reference to the trigger placed in front of the door.
    # Wire this up in the UEFN editor.
    @editable
    EnterTrigger : trigger_device = trigger_device{}

    # A reference to a customizable light device on the door.
    # Use a customizable_light_device to fake the glow effect.
    # note: Verse cannot write directly to mesh materials at runtime;
    # a customizable_light_device is the closest real API for
    # changing color on a prop dynamically.
    @editable
    DoorLight : customizable_light_device = customizable_light_device{}

    # OnBegin runs once when the game starts.
    # We subscribe to the trigger events here.
    OnBegin<override>()<suspends> : void =
        # Subscribe to player-enter and player-leave events
        # on the trigger device.
        EnterTrigger.TriggeredEvent.Subscribe(OnPlayerEnter)

    # This function runs when someone enters the trigger.
    OnPlayerEnter(Agent : ?agent) : void =
        # Turn the light bright blue to simulate a glow.
        DoorLight.TurnOn()

    # This function runs when someone leaves the trigger.
    # note: trigger_device only exposes TriggeredEvent (enter).
    # To handle "leave", add a second trigger_device around the
    # door exit, wire it to a second glowing_door_device whose
    # OnPlayerEnter calls TurnOff with the dark values below,
    # or use a timer_device to reset after a delay.
    OnPlayerLeave(Agent : ?agent) : void =
        # Change the light back to simulate no glow.
        DoorLight.TurnOff()