class_name PlayerController
extends CharacterBody3D
## First-person player controller.
## WASD movement, mouse-look, gravity, and an interaction raycast.

@export var walk_speed: float = 4.0
@export var mouse_sensitivity: float = 0.0025
@export var pitch_limit_deg: float = 89.0

## When true, all movement and look input is ignored (e.g. while seated).
var movement_locked: bool = false

@onready var camera: Camera3D = $Camera3D
@onready var interaction_ray: RayCast3D = $Camera3D/InteractionRay

var _gravity: float = ProjectSettings.get_setting("physics/3d/default_gravity", 9.8)


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


func _unhandled_input(event: InputEvent) -> void:
	if movement_locked:
		return

	# Mouse look.
	if event is InputEventMouseMotion and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
		rotate_y(-event.relative.x * mouse_sensitivity)
		camera.rotate_x(-event.relative.y * mouse_sensitivity)
		var limit := deg_to_rad(pitch_limit_deg)
		camera.rotation.x = clampf(camera.rotation.x, -limit, limit)

	# Release / recapture mouse with Escape (handy for alt-tab / debugging).
	if event.is_action_pressed("ui_cancel"):
		if Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
			Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
		else:
			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED


func _physics_process(delta: float) -> void:
	# Gravity.
	if not is_on_floor():
		velocity.y -= _gravity * delta

	if movement_locked:
		velocity.x = 0.0
		velocity.z = 0.0
		move_and_slide()
		return

	# Horizontal movement from input.
	var input_dir := Input.get_vector(
		"move_left", "move_right", "move_forward", "move_back"
	)
	var direction := (transform.basis * Vector3(input_dir.x, 0.0, input_dir.y)).normalized()
	if direction != Vector3.ZERO:
		velocity.x = direction.x * walk_speed
		velocity.z = direction.z * walk_speed
	else:
		velocity.x = move_toward(velocity.x, 0.0, walk_speed)
		velocity.z = move_toward(velocity.z, 0.0, walk_speed)

	move_and_slide()


## Returns the object currently under the interaction ray, or null.
func get_interaction_target() -> Object:
	if interaction_ray and interaction_ray.is_colliding():
		return interaction_ray.get_collider()
	return null


## Lock or unlock player movement/look (used by sit-down and minigames).
func set_movement_locked(locked: bool) -> void:
	movement_locked = locked