using { /Fortnite.com/Devices }
using { /UnrealEngine.com/Temporary/Diagnostics }

# This is our custom device blueprint.
# Think of it as a "Smart Music Remote" that we place in the level.
combat_music_switch := class(creative_device):

    # @editable means you can change these settings in the editor panel.
    # It's like the "dials" on a radio.
    
    # The Guard Spawner that triggers the change.
    @editable
    EnemySpawner: guard_spawner_device = guard_spawner_device{}
    
    # The Music Manager we want to control.
    @editable
    MusicController: music_manager_device = music_manager_device{}
    
    # This is our "Light Switch" variable.
    # It starts as False (Calm Mode).
    is_panic_mode: bool = false

    # This function runs when the device is first placed in the world.
    # It's like the "Power On" button for your code.
    OnBegin<override>()<suspends>: void =
        # Subscribe to the spawner's "Spawned" event.
        # This means: "Hey Spawner, tell me every time you make a new enemy."
        EnemySpawner.SpawnedEvent.Subscribe(SpawnHandler)

    # This is the function that runs when the event happens.
    # 'spawner' is the specific spawner that just made an enemy.
    SpawnHandler := func(spawner: guard_spawner_device): void =
        # Toggle our light switch.
        # If it was False, it becomes True. If True, it becomes False.
        is_panic_mode = !is_panic_mode
        
        if (is_panic_mode):
            # PANIC MODE ON
            # Switch to A Minor (scary) and speed up the tempo.
            # We use SetKey and SetTempo to change the global audio state.
            MusicController.SetKey(MusicKey.A_Minor)
            MusicController.SetTempo(120.0) # Faster beats!
            Print("PANIC MODE ACTIVATED: Music is now SCARY.")
        else:
            # CALM MODE ON
            # Switch back to C Major (safe) and slow down.
            MusicController.SetKey(MusicKey.C_Major)
            MusicController.SetTempo(80.0) # Slow, chill beats.
            Print("CALM MODE: Music is now CHILL.")