extends CharacterBody2D

class_name Npc

const SPEED = 100
const MINIMUM_STATE_DURATION = 3

const STATES = ['panic', 'dead']

var gravity = ProjectSettings.get_setting("physics/2d/default_gravity")
var direction = 0
var rising_speed = 0

func _ready():
	pick_new_direction()
	$fsm.set_states(STATES)

func panic_state(delta):
	if is_on_wall():
		direction *= -1

	var should_update = (
		$fsm.state_duration >= MINIMUM_STATE_DURATION
		&& ceil($fsm.state_duration) % 2 == (randi() %2)
		)

	if should_update:
		pick_new_direction()
		$fsm.state_duration = 0

	velocity.x = direction
	velocity.y += gravity * delta
	move_and_slide()

func on_enter_dead_state():
	$shape.queue_free()

func dead_state(_delta):
	velocity = Vector2(0, -rising_speed * (randf_range(0.9,1)))
	move_and_slide()


func die(level_speed):
	$fsm.set_next_state('dead')
	rising_speed = level_speed

func pick_new_direction():
	direction = [1,-1][randi_range(0,1)] * SPEED