extends KinematicBody

const SPEED_FORWARD = 20
const SPEED_MAX = 20
const SPEED_TURN = 120
const SPEED_AIM = PI / 2

var bullet_alterating = 0
var velocity = Vector3()
var scene_bullet = preload("res://player/bullet.tscn")

# Called when the node enters the scene tree for the first time.
func _ready():
	pass # Replace with function body.

func get_player_input(delta):
	var vec_lateral = transform.basis.x
	var vec_vertical = transform.basis.y
	
	
	if Input.is_action_pressed("player_left"):
		velocity += SPEED_TURN * -vec_lateral * delta
	elif Input.is_action_pressed("player_right"):
		velocity += SPEED_TURN * vec_lateral * delta
		
	if Input.is_action_pressed("player_up"):
		velocity += SPEED_TURN * vec_vertical * delta
	elif Input.is_action_pressed("player_down"):
		velocity += SPEED_TURN * -vec_vertical * delta
	
	if Input.is_action_pressed("player_aim_up"):
		rotate_object_local(Vector3.RIGHT, SPEED_AIM * delta)
	elif Input.is_action_pressed("player_aim_down"):
		rotate_object_local(Vector3.RIGHT, -SPEED_AIM * delta)	
		
	if Input.is_action_pressed("player_aim_left"):
		rotate(Vector3.UP, SPEED_AIM * delta)
	elif Input.is_action_pressed("player_aim_right"):
		rotate(Vector3.UP, -SPEED_AIM * delta)	
		
	# offense
	if Input.is_action_pressed("player_fire"):
		if $bullet_timer.time_left == 0:
			fire_bullet()
		
func fire_bullet():
	var bullet = scene_bullet.instance()
	$"..".add_child(bullet)
	
	bullet_alterating = (bullet_alterating + 1) % 2
	bullet.translation = translation - transform.basis.x * (4 * bullet_alterating - 2)
	bullet.rotation = rotation
	bullet.direction = -transform.basis.z
	
	$bullet_timer.start()
	
func _process(delta):
	# get velocity changes player asks for
	get_player_input(delta)
	
	# move foward according to the camera's POV
	var vec_forward = transform.basis.z
	velocity += SPEED_FORWARD * -vec_forward * delta
	
	# air friction
	var friction = SPEED_MAX / velocity.length()
	velocity *= friction

func _physics_process(_delta):
	velocity = move_and_slide(velocity, Vector3.UP)