extends CharacterBody3D
##玩家
class_name  Player

@onready var people: Node3D = $people

@onready var state_machine: StateMachine = $StateMachine
##导航
@onready var navigation_agent_3d: NavigationAgent3D = $NavigationAgent3D

## 运动方式的枚举
enum Exercise_type{
	no, #没用运动
	navigation, #导航代理
	pathFollow, #路径跟随
}

var currentExerciseType :Exercise_type = Exercise_type.no

var speed:float = 1
var stop_distance:float = 1

signal ArriveTargetPos
##设置目标位(寻路方式运动)
func setTargetPos(targetPos:Vector3,stopDistance = 1)-> void:
	stop_distance = stopDistance
	navigation_agent_3d.target_position = targetPos
	navigation_agent_3d.target_position =navigation_agent_3d.get_final_position()

##去目标位
func goToTarget()-> void:
	currentExerciseType = Exercise_type.navigation
	$NavigationTimer.start()
	state_machine.change_state("Walk")

##停止移动
func stopToTarget()-> void:
	$NavigationTimer.stop()
	state_machine.change_state("Idle")

func _on_navigation_timer_timeout() -> void:
	var direction_3d = (navigation_agent_3d.get_next_path_position() - global_position).normalized()
	velocity = direction_3d*speed*4
	if global_position != navigation_agent_3d.get_next_path_position() :
		look_at_from_position(global_position, navigation_agent_3d.get_next_path_position())
	if navigation_agent_3d.distance_to_target() > stop_distance :
		move_and_slide()
	else :
		stopToTarget()
		ArriveTargetPos.emit()
		currentExerciseType = Exercise_type.no


##区域碰撞检测相关
signal AreaEnter(area: Area3D)

signal AreaExit(area: Area3D)

func _on_area_3d_area_entered(area: Area3D) -> void:
	AreaEnter.emit(area)
	if currentExerciseType == Exercise_type.navigation and area.is_in_group('needStopWalk') :
		stopToTarget()

func _on_area_3d_area_exited(area: Area3D) -> void:
	AreaExit.emit(area)
	if currentExerciseType == Exercise_type.navigation and area.is_in_group('needStopWalk') :
		goToTarget()

var frontPeople = 0
func _on_people_front_area_3d_area_entered(area: Area3D) -> void:
	var peopleWalkFollow = area.get_parent().get_parent()
	if ( area.is_in_group('player') and  peopleWalkFollow.id != self.get_parent().id ) or area.is_in_group('needStopWalk') :
		frontPeople += 1


func _on_people_front_area_3d_area_exited(area: Area3D) -> void:
	var peopleWalkFollow = area.get_parent().get_parent()
	if  ( area.is_in_group('player') and  peopleWalkFollow.id != self.get_parent().id ) or area.is_in_group('needStopWalk') :
		frontPeople -= 1

func changeAreaRadius(radius:int) -> void:
	$Area3D/CollisionShape3D.shape.radius = radius