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

# This is our main script class. Think of it as the "brain" for the powerup.
class GlassCannonPowerup is WorldDevice():
    # DATA MEMBERS (Variables):
    # These are the settings you can tweak in the editor or here.
    # Duration is how long the buff lasts (in seconds).
    Duration: float = 15.0
    
    # Multiplier is how much damage is boosted. 2.0 means double damage.
    DamageMultiplier: float = 2.0
    
    # This is a reference to the actual Powerup Device in the editor.
    # We link this in the editor, or we can find it programmatically.
    # For simplicity, we assume this script IS attached to the device.
    SelfDevice: DamageAmplifierPowerupDevice = Self
    
    # This tracks who currently has the buff.
    # An "Agent" is a player or NPC.
    # We use an "optional" type because no one has the buff at the start.
    CurrentHolder: optional Agent = none
    
    # INITIALIZATION:
    # This runs once when the island starts or the device spawns.
    OnBegin<override>()<suspends>: void = super.OnBegin() <suspends>
        # We connect our custom function to the device's pickup event.
        # Think of this like plugging a wire into a trigger.
        SelfDevice.ItemPickedUpEvent += OnItemPickedUp
        SelfDevice.ItemDroppedEvent += OnItemDropped

    # EVENT HANDLER: When someone picks up the powerup
    OnItemPickedUp: func(Holder: Agent): void =
        # 1. Check if someone already has the buff.
        # If CurrentHolder is not none, someone is already "Glass Cannoning."
        if CurrentHolder != none:
            # Remove the buff from the previous holder.
            RemoveBuff(CurrentHolder)
        
        # 2. Set the new holder.
        CurrentHolder = Holder
        
        # 3. Apply the buff.
        # In Verse/UEFN, we often use device methods or state changes.
        # Here we simulate the "amplified state" by changing a visual cue 
        # or using the device's native amplification if available.
        # For this example, we'll assume we are managing the logic manually
        # to demonstrate the timer and state tracking.
        
        # NOTE: The native DamageAmplifierPowerupDevice handles the actual 
        # damage math internally. We are just managing the lifecycle here.
        # We trigger the device's activation if it wasn't already active.
        # (Assuming the device is set to "Manual" trigger in editor, 
        # or we rely on the event to signal the effect start).
        
        # 4. Start the countdown timer.
        # "After" creates a delay. When the delay finishes, it runs the lambda.
        After(Duration):
            # This code runs exactly 'Duration' seconds later.
            if CurrentHolder == Holder:
                # Only remove if this holder is still the current one.
                RemoveBuff(Holder)
                CurrentHolder = none

    # EVENT HANDLER: When someone drops the powerup (rare for powerups, but good practice)
    OnItemDropped: func(Dropper: Agent): void =
        if CurrentHolder == Dropper:
            RemoveBuff(Dropper)
            CurrentHolder = none

    # HELPER FUNCTION: Removes the buff effect
    RemoveBuff: func(AgentToRemove: Agent): void =
        # In a full implementation, you might play a sound, change their color,
        # or reset their damage stats if you were doing custom damage math.
        # Since DamageAmplifierPowerupDevice handles the damage multiplier natively,
        # we just need to ensure the device stops affecting them if we were 
        # using a custom damage volume. 
        # For this device, the "effect" is tied to the pickup event triggering 
        # the internal state. When the timer ends, we rely on the device's 
        # internal timeout or we simply stop tracking it in our script.
        
        # Let's play a "power down" sound for feedback!
        # (Assuming a sound prop exists or using a simple visual cue)
        # We'll just print to the debug console for now.
        DebugPrint("{AgentToRemove.GetName()} lost the Glass Cannon buff!")