grunk/src/player/player.gd

class_name Player extends CharacterBody3D

const RUN_SPEED := 80.0
const SPRINT_SPEED := 160.0
const AIR_SPEED := 10.0
const JUMP_FORCE := 4.5
const GROUND_FRICTION := 0.3
const AIR_FRICTION := 0.03

const SPRAY_SCALE := 16

var gravity: Vector3 = (
	ProjectSettings.get_setting("physics/3d/default_gravity")
	* ProjectSettings.get_setting("physics/3d/default_gravity_vector")
)

@onready var camera_pivot: Node3D = %CameraPivot
@onready var spray_muzzle: Marker3D = %SprayMuzzle
@onready var raycast: RayCast3D = %RayCast3D

@onready var spray_effect: MeshInstance3D = %SprayEffect


func get_speed() -> float:
	if is_on_floor():
		if Input.is_action_pressed("sprint"):
			return SPRINT_SPEED
		return RUN_SPEED
	return AIR_SPEED


func get_friction() -> float:
	if is_on_floor():
		return GROUND_FRICTION
	return AIR_FRICTION


func _scale_spray_point(point: Vector3) -> float:
	return point.distance_to(spray_muzzle.global_position) * SPRAY_SCALE


func fire_spray() -> void:
	if raycast.is_colliding():
		var collider := raycast.get_collider()
		if collider is GunkBody:
			var point := raycast.get_collision_point()
			var point_scale := point.distance_to(spray_muzzle.global_position) * SPRAY_SCALE
			(collider as GunkBody).paint_continuous(
				point, raycast.get_collision_normal(), point_scale
			)


func _physics_process(delta: float) -> void:
	if Input.is_action_pressed("fire"):
		fire_spray()
		spray_effect.visible = true
	else:
		spray_effect.visible = false

	# Gravity
	if not is_on_floor():
		velocity += gravity * delta

	# Input movement
	var input_dir := Input.get_vector("move_left", "move_right", "move_forward", "move_back")
	var direction := (
		(camera_pivot.global_basis * Vector3(input_dir.x, 0, input_dir.y) * Vector3(1, 0, 1))
		. normalized()
	)
	var movement := direction * get_speed() * delta
	velocity.x += movement.x
	velocity.z += movement.z
	if Input.is_action_just_pressed("jump") and is_on_floor():
		velocity.y = JUMP_FORCE

	# Friction
	var friction := get_friction()
	velocity.x = lerpf(velocity.x, 0, friction)
	velocity.z = lerpf(velocity.z, 0, friction)

	move_and_slide()