extends CharacterBody3D


@export var camera: Camera3D

const VIEW_BOB_FREQUENCY = 8
const VIEW_BOB_AMPLITUDE = 0.03

var gravity := 20.0
var speed := 2.0
var turn_speed_sec := 0.1
var turn_degrees := 90
var view_bob_time := 0.0 # increased while velocity is not zero


func _get_input() -> Vector3:
	var input_dir := Vector3()

	if Input.is_action_pressed("move_forward"):
		input_dir -= global_transform.basis.z
	if Input.is_action_pressed("move_backward"):
		input_dir += global_transform.basis.z

	return input_dir.normalized()


func _process_view_bobbing(delta: float) -> void:
	view_bob_time += delta * velocity.length()
	camera.position.y = sin(view_bob_time * VIEW_BOB_FREQUENCY) * VIEW_BOB_AMPLITUDE
	camera.position.x = cos(view_bob_time * (VIEW_BOB_FREQUENCY / 2)) * VIEW_BOB_AMPLITUDE


func _ready() -> void:
	pass


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("turn_left"):
		create_tween().tween_property(
			self,
			"rotation_degrees:y",
			rotation_degrees.y + turn_degrees,
			turn_speed_sec
		)
	if event.is_action_pressed("turn_right"):
		create_tween().tween_property(
			self,
			"rotation_degrees:y",
			rotation_degrees.y - turn_degrees,
			turn_speed_sec
		)


func _process(delta: float) -> void:
	_process_view_bobbing(delta)


func _physics_process(delta: float) -> void:
	velocity.y -= gravity * delta
	var final_velocity = _get_input() * speed

	velocity.x = final_velocity.x
	velocity.z = final_velocity.z
	move_and_slide()