heliostat/src/player/third_person_camera.gd

class_name ThirdPersonCamera
extends Node3D

const CROSSHAIR_MOUSE_JOSTLE: float = 0.6
const CORRECTION_SPEED: float = 10

@export var yaw_sensitivity: float = 0.4
@export var yaw_acceleration: float = 20.0

@export var pitch_sensitivity: float = 0.4
@export var pitch_acceleration: float = 20.0
@export_range(-90.0, 90.0) var pitch_min: float = -70.0
@export_range(-90.0, 90.0) var pitch_max: float = 75.0
@export var invert_pitch: bool = false

@onready var _target: Vector2 = Vector2(global_rotation_degrees.x, rotation_degrees.y)

@onready var _crosshair: Crosshair = get_tree().get_first_node_in_group("CrosshairGroup")


func _ready() -> void:
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED


func jostle(delta: float) -> void:
	rotation_degrees.z += delta


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseMotion:
		var motion: Vector2 = (event as InputEventMouseMotion).relative
		_target.y = _target.y - motion.x * yaw_sensitivity
		_target.x = clampf(
			_target.x + motion.y * pitch_sensitivity * (-1 if invert_pitch else 1),
			pitch_min,
			pitch_max
		)
		_crosshair.jostle(motion * CROSSHAIR_MOUSE_JOSTLE)


func _physics_process(delta: float) -> void:
	rotation_degrees.y = lerpf(rotation_degrees.y, _target.y, delta * yaw_acceleration)
	rotation_degrees.x = lerpf(rotation_degrees.x, _target.x, delta * pitch_acceleration)

	rotation_degrees.z = lerpf(rotation_degrees.z, 0.0, delta * CORRECTION_SPEED)