class_name Enemy
extends Creature

enum State {
	IDLE,
	CHASE,
	ATTACK
}

@export
var state: State = State.IDLE

@export_category("Parts")
@export
var animation_player: AnimationPlayer

@export
var sprite: Sprite2D

@export
var detection_area: Area2D

var _chase_target: Node2D
var _target_is_left: bool = false

func _play_animation(animation: String) -> void:
	if not animation_player:
		return

	if not animation_player.has_animation(animation):
		return
	
	if animation_player.is_playing() and animation_player.current_animation == animation:
		return
	
	animation_player.play(animation)

func _on_ready() -> void:
	self.detection_area.body_entered.connect(self._on_detection_area_entered)

func _process(delta: float) -> void:
	var animation_name = str(State.keys()[self.state]).to_lower()
	self._play_animation(animation_name)
	sprite.flip_h = self._target_is_left

func _physics_process(delta: float) -> void:
	match self.state:
		State.CHASE:
			if not self._chase_target:
				self.state = State.IDLE
			
			self._target_is_left = self._chase_target.position.x < self.position.x

func _on_detection_area_entered(body: CollisionObject2D) -> void:
	match state:
		State.IDLE:
			if body is Player:
				self._chase_target = body
				self.state = State.CHASE