grunk/src/world/spook_manager/spook_manager.gd

class_name SpookManager extends Resource
## A strategy for handling horror elements through the level.

const SPAWN_GROUP := "BeastSpawnPoint"
const BEAST_GROUP := "GrunkBeast"

@export var grunkbeast_scene: PackedScene

var debug_set_alert_level: int:
	set = on_alert_raised


func _spawn_beast_at_point(spawn_point: Node3D) -> void:
	print_debug("Spawning active beast at ", spawn_point.global_position)
	var beast: GrunkBeast = grunkbeast_scene.instantiate()
	spawn_point.add_child(beast)


## Spawn a beast somewhere the player isn't looking.
func spawn_beast() -> void:
	var spawn_point := SceneTools.pick_unseen_from_group(SPAWN_GROUP)
	if not spawn_point:
		print_debug("Couldn't find a hidden spawn point... Picking one at random.")
		var nodes := World.instance.get_tree().get_nodes_in_group(SPAWN_GROUP)
		if not nodes:
			print_debug("Oh that's why. There aren't any spawn points. Complain to a developer.")
			return
		@warning_ignore("unsafe_cast")
		spawn_point = nodes.pick_random() as Node3D

	_spawn_beast_at_point(spawn_point)


## Spawn beasts at _every_ spawn point the player can't see.
func spawn_many_beasts() -> void:
	var nodes := World.instance.get_tree().get_nodes_in_group(SPAWN_GROUP)
	for node: Node in nodes:
		var target := node as Node3D
		if is_instance_valid(target) and not SceneTools.player_can_see(target.global_position):
			_spawn_beast_at_point(target)


func on_alert_raised(new_level: int) -> void:
	match new_level:
		0:
			# LEVEL 0: UNAWARE
			pass
		1:
			# LEVEL 1: PASSIVE
			# Beast avoids the player.
			# Set up meet-spook.
			# Get closest MeetSpook point to player.
			if Player.instance:
				var closest := (
					SceneTools.closest_in_group(Player.instance, MeetSpook.GROUP) as MeetSpook
				)
				if closest:
					closest.prepare()
		2:
			# LEVEL 2: AGGRESSIVE
			# Beast pursues player on sight.
			spawn_beast()
		3:
			# LEVEL 3: PREDATORY
			# Beast pursues player relentlessly.
			# The logic for this behavior change is handled directly in the GrunkBeast AI.
			pass
		4:
			# LEVEL 4: SWARMING
			# Many beasts spawn, overwhelming the player.
			spawn_many_beasts()
		5:
			# LEVEL 5: FUN
			# Just kill that fool!
			pass  # TODO


func on_alert_cleared() -> void:
	# Destroy all grunk beasts
	for b: Node in World.instance.get_tree().get_nodes_in_group(BEAST_GROUP):
		b.queue_free()

	# And spawn one back in, if needed
	if World.instance.manager.alert_level >= 2:
		spawn_beast()


## Set the state of spooky effects after a level is initialized & any save state is loaded.
func after_level_init() -> void:
	on_alert_cleared()