class_name MonsterSpawnpoint
extends Node3D

# a spawnpoint that can spawn monsters around the center point
# with a given distance
# monsters are only spawned, if the player is not looking

@onready var spawn_timer: Timer = Timer.new()

# list that holds all spawnable monsters
@export var spawnable_monsters: Array[PackedScene]

# the maximum amount of spawned monsters
# no monsters will spawn, when this number is reached
@export var max_monsters: int = 5

# the maximum distance a monster can spawn around the spawnpoint
@export var max_distance_spawn: float = 10.0

# the maximum lifetime a monster can be in the world
# a monster is then deleted if the following conditions are met:
# the monster has exceeded its maximum lifetime and it is not on screen
# TODO: figure out how to check for the exceeded lifetime and delete
@export var max_lifetime: float = 60.0 # seconds

@export var spawn_cooldown: float = 3.0 # seconds

# a spawnpoint should keep track of spawned entities
#var active_monsters: Array[Monster] = []

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	spawn_timer.wait_time = spawn_cooldown
	spawn_timer.autostart = true
	spawn_timer.timeout.connect(spawn)
	add_child(spawn_timer)
	spawn_timer.start()

func spawn() -> void:
	if $VisibleOnScreenNotifier3D.is_on_screen():
		print("Spawnpoint is visible on screen. Not spawning a monster.")
		return
		
	# TODO: Add a check to not spawn enemies X units near the player
		
	# get a random position near the spawn point
	var spawn_point_x = randf_range(-max_distance_spawn, max_distance_spawn)
	var spawn_point_z = randf_range(-max_distance_spawn, max_distance_spawn)
	
	# instantiate a monster .tscn scene
	var monster_to_spawn = spawnable_monsters[0].instantiate()
	
	# calculate the position of the monster and add the offset of the spawnpoint itself
	var monster_position = Vector3(spawn_point_x, 0.2, spawn_point_z)
	monster_to_spawn.position = monster_position + position
		
	var debug_level_node = get_node("/root/Main/CurrentLevel/DebugLevel")
	debug_level_node.add_child(monster_to_spawn)
	print("spawning mob")
	
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	var time = Time.get_ticks_msec()
	$Diamond.rotation.y = sin(time / 800.0) * 2
	$Diamond.position.y = 1.5 + sin(time / 800.0) * 0.3