extends KinematicBody2D

const DeathEffect = preload("res://Effects/EnemyDeathEffect.tscn")

var knockback = Vector2.ZERO
var velocity = Vector2.ZERO

onready var stats = $Stats
onready var player_detector = $PlayerDetectionZone
onready var sprite = $AnimatedSprite
onready var original_position = global_position

export(int) var acceleration = 300
export(int) var max_speed = 300
export(int) var friction = 200

enum {
	IDLE,
	MOVE,
	CHASE,
	MOVE_BACK
}

onready var state = IDLE

func _physics_process(delta):
	knockback = knockback.move_toward(Vector2.ZERO, 200 * delta)
	knockback = move_and_slide(knockback)

	match state:
		IDLE:
			velocity = velocity.move_toward(Vector2.ZERO, friction)
			seek_player()

		MOVE_BACK:
			# TODO: Navigation here
			pass

		MOVE:
			pass
		CHASE:
			var player = player_detector.player
			if player != null:
				var direction = (player.global_position - global_position).normalized()
				velocity = velocity.move_toward(direction * max_speed, acceleration * delta)
				sprite.flip_h = velocity.x < 0
			else:
				state = IDLE

	velocity = move_and_slide(velocity)

func around_the_original_position():
	return abs(original_position.x - global_position.x) < 5 and abs(original_position.y - global_position.y) < 5


func seek_player():
	if player_detector.is_player_detected():
		state = CHASE


func _on_HurtBox_area_entered(area):
	stats.health -= area.damage
	knockback = area.knockback_vector * 120


func _on_Stats_no_health():
	queue_free()
	var effect = DeathEffect.instance()
	get_parent().add_child(effect)
	effect.global_position = global_position