extends Node3D
class_name AI

@onready var character: Character = (get_owner() as Character)
@onready var status: Status = (%Status as Status)

var ai: BeehaveTree
var is_init: bool = false
var has_ai: bool  = false


func _process(delta) -> void:
	if not is_init:
		init()
	else:
		process(delta)


func init() -> void:
	if not status.cfg:
		return
	is_init = true
	var ai_scene: PackedScene = status.cfg.get_ai()
	if not ai_scene:
		return
	ai = ai_scene.instantiate() as BeehaveTree
	ai.tick_rate = 20
	add_child(ai)
	has_ai = true
	on_init()


func process(delta) -> void:
	if has_ai and status.ai_is_alert:
		on_process(delta)
	else:
		if status.cfg.ai:
			stroll()
			var player: Character  = Global.character_mgr.get_player()
			var dir: Vector2       = player.pos2D() - character.pos2D()
			var dist: float        = dir.length()
			var can_see: bool      = character.get_face_dir().angle_to(dir) < PI/2
			var alert_range: float = status.cfg.ai.alert_range if can_see else status.cfg.ai.alert_range_back
			var alert_speed: float = status.cfg.ai.alert_speed if can_see else status.cfg.ai.alert_speed_back
			if dist < alert_range:
				status.ai_alert += alert_speed * delta
				status.emit_status("ai_alert")
				if status.ai_alert >= status.ai_alert_max:
					status.ai_is_alert = true
					status.ai_alert = 0
					status.emit_status("ai_is_alert")
					status.emit_status("ai_alert")
			else:
				status.ai_alert -= status.cfg.ai.alert_recover * delta
				if status.ai_alert < 0:
					status.ai_alert = 0
				status.emit_status("ai_alert")
		else:
			status.ai_is_alert = true
			status.emit_status("ai_is_alert")


func stroll() -> void:
	#todo 闲逛
	character.move_stop()
	pass


func on_init() -> void:
	pass


func on_process(delta):
	pass