extends Node3D
class_name LevelActive

@export var open_duration: float = 1
@export var target_level_active: LevelActive

var is_open_target: bool = false
var is_open: bool = false
var is_openning: bool = false
var open_progress: float = 0

var body_entered_count: int
var character_list: Array[Character] = []

func init() -> void:
	var area3D: Area3D = %Area3D as Area3D
	if area3D:
		area3D.connect("body_entered", on_body_entered)
		area3D.connect("body_exited", on_body_exited)
	for node in get_children():
		if node is LevelActive:
			node.init()
	on_init()

func _process(delta):
	if is_openning:
		var delta_dir = 1 if is_open_target else -1
		open_progress += delta * delta_dir
		open_progress = clamp(open_progress, 0, open_duration)
		var progress = open_progress / open_duration
		if progress == 1 or progress == 0:
			is_open = is_open_target
			is_openning = false
			on_open_finished()
		on_process_open(progress)
	
func on_body_entered(body: Node3D) -> void:
	if body is Character:
		character_list.append(body)
	body_entered_count += 1
	on_body_entered_count_changed()

func on_body_exited(body: Node3D) -> void:
	if body is Character and body in character_list:
		character_list.erase(body)
	body_entered_count -= 1
	on_body_entered_count_changed()

func set_open(is_open_set: bool) -> void:
	is_open_target = is_open_set
	is_openning = true

func on_open_finished() -> void:
	on_set_open(is_open)
	if target_level_active:
		target_level_active.set_open(is_open)

func on_init() -> void: pass
func on_set_open(_is_open_set: bool) -> void: pass
func on_process_open(_rate: float) -> void: pass
func on_body_entered_count_changed() -> void: pass