extends Node3D
class_name AI

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

var is_init: 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 behavior_tree_res: BehaviorTree = status.cfg.get_ai()
	if not behavior_tree_res:
		print("未配置AI", character.cfg().get_res_name())
		Global.character_mgr.destroy_character(character.id())
		return
	btPlayer.behavior_tree = behavior_tree_res
	on_init()


func process(delta) -> void:
	if not status.ai_is_alert:
		if status.cfg.ai:
			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")
	on_process(delta)
	btPlayer.update(delta)

func on_init() -> void: pass

func on_process(_delta) -> void: pass