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

# This is our main script block
alert_system := class(creative_device):
    # We store references to our devices here.
    # This is like giving them nicknames.
    @editable
    MasterSwitch : switch_device = switch_device{}
    @editable
    TestSwitch : switch_device = switch_device{}
    @editable
    AlertLabel : text_block_device = text_block_device{}

    # This function runs when the script starts.
    OnBegin<override>()<suspends> : void =
        # Subscribe to the Test Switch events.
        # When a player turns it on, call OnTestSwitchTurnedOn.
        # When a player turns it off, call OnTestSwitchTurnedOff.
        TestSwitch.TurnedOnEvent.Subscribe(OnTestSwitchTurnedOn)
        TestSwitch.TurnedOffEvent.Subscribe(OnTestSwitchTurnedOff)

        # Start with the Alert OFF.
        MasterSwitch.TurnOff()
        UpdateLabelText(false)

    # This function updates the text on the screen.
    # It checks the Master Switch state via a bool we pass in.
    UpdateLabelText(IsOn : logic) : void =
        if (IsOn?):
            # If IsOn is true, the switch is ON.
            AlertLabel.SetText(StringToMessage("ALERT: ON"))
        else:
            # If IsOn is false, the switch is OFF.
            AlertLabel.SetText(StringToMessage("ALERT: OFF"))

    # This event happens when the Test Switch is turned On.
    # It forces the Master Switch to turn On too.
    OnTestSwitchTurnedOn(Agent : agent) : void =
        # Turn the master switch on to match.
        MasterSwitch.TurnOn()
        # Update the text label.
        UpdateLabelText(true)

    # This event happens when the Test Switch is turned Off.
    # It forces the Master Switch to turn Off too.
    OnTestSwitchTurnedOff(Agent : agent) : void =
        # Turn the master switch off to match.
        MasterSwitch.TurnOff()
        # Update the text label.
        UpdateLabelText(false)