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

# This is our main device class. It inherits from creative_device
# so it can live in the level and react to game events.
toggle_message_board := class(creative_device):

    # Wire your Button device to this property in the
    # Verse Explorer (Details panel) after uploading.
    @editable
    ButtonDevice : button_device = button_device{}

    # We create an empty map to store widgets.
    # The key is the player. The value is the widget.
    var WidgetMap : [player]text_block = map{}

    # OnBegin runs automatically when the game session starts.
    OnBegin<override>()<suspends> : void =
        # Connect the button's InteractedWithEvent to our handler.
        ButtonDevice.InteractedWithEvent.Subscribe(OnButtonPressed)

    # This function runs every time the button is pressed.
    OnButtonPressed(Agent : agent) : void =
        # We need a player, not just an agent. Convert safely.
        if (Player := player[Agent]):
            # Get the player_ui interface so we can add/remove widgets.
            if (PlayerUI := GetPlayerUI[Player]):
                # Check if this player already has a widget in our map.
                if (ExistingWidget := WidgetMap[Player]):
                    # The widget exists! Let's remove it.
                    PlayerUI.RemoveWidget(ExistingWidget)
                    # Remove it from our map too.
                    set WidgetMap = map{}
                else:
                    # No widget yet. Let's make one!
                    NewWidget := text_block:
                        DefaultText := StringToMessage("Hello, Player!")
                    # Show the widget on this player's screen.
                    # ZOrder 0 places it at the default layer.
                    PlayerUI.AddWidget(NewWidget, player_ui_slot{ZOrder := 0})
                    # Save the widget in our map for this player.
                    if (NewWidgetMap := WidgetMap.Clone[Player -> NewWidget]):
                        set WidgetMap = NewWidgetMap