# KillRewards.verse
# This script listens for eliminations and upgrades the winner's weapon.

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

# We define our main script here. Think of this as the "Brain" of the island.
# It must be a creative_device so UEFN can place it on the island as an actor.
KillRewards := class(creative_device):

    # Step 1: Reference the Elimination Manager.
    # In Verse, we declare a device property and then wire it up in the
    # UEFN Details panel — drag your placed Elimination Manager into this slot.
    @editable
    EliminationManager : elimination_manager_device = elimination_manager_device{}

    # Step 2: Per-player kill counter.
    # We use a weak_map so entries are cleaned up automatically when a player leaves.
    # var means the map itself can be replaced with an updated copy.
    var KillCounts : [player]int = map{}

    # OnBegin is the Verse entry point — called once when the game session starts.
    OnBegin<override>()<suspends> : void =
        # Step 3: Subscribe to the EliminationManager's elimination event.
        # EliminatedEvent fires with an ?agent whenever a player
        # is knocked out. We pass our handler as the subscriber.
        EliminationManager.EliminationEvent.Subscribe(OnElimination)

    # Step 4: Our handler — called automatically each time an elimination occurs.
    # The EliminationEvent passes an ?agent representing the eliminating agent.
    OnElimination(EliminatingAgent : ?agent) : void =
        # Pull the eliminating agent out of the option type.
        # It is an ?agent (option type) because environment kills have no killer.
        if (EliminatingAgentValue := EliminatingAgent?):
            # Cast the agent to a player. Bots are agents but not players.
            if (EliminatingPlayer := player[EliminatingAgentValue]):

                # Step 5: Look up — or initialise — the player's kill count.
                CurrentKills : int =
                    if (Existing := KillCounts[EliminatingPlayer]):
                        Existing
                    else:
                        0

                # Increment and store the new count.
                NewKills := CurrentKills + 1
                if (set KillCounts[EliminatingPlayer] = NewKills) {}

                # Step 6: The Logic (If/Else).
                # Fewer than 3 kills → "Noob" tier  → grant a Shotgun via Item Granter.
                # 3 or more kills   → "Pro"  tier  → grant a Rocket Launcher.
                #
                # Real Verse has no bare Items.Shotgun constant; item granting is done
                # through item_granter_device instances wired up in the Details panel.
                # Wire "ShotgunGranter" to an Item Granter set to grant a Shotgun,
                # and "RocketGranter" to one set to grant a Rocket Launcher.
                if (NewKills < 3):
                    ShotgunGranter.GrantItem(EliminatingPlayer)
                    Print("Got a Shotgun! Keep killing!")   # note: prints to UEFN log
                else:
                    RocketGranter.GrantItem(EliminatingPlayer)
                    Print("You're on fire! Here's a Rocket Launcher!")

    # Step 7: Item Granter device references.
    # Wire these in the UEFN Details panel to Item Granter devices placed on the map.
    # Set each Item Granter's item to the weapon you want to award.
    @editable
    ShotgunGranter : item_granter_device = item_granter_device{}

    @editable
    RocketGranter : item_granter_device = item_granter_device{}