class_name FlyCamera
extends Camera3D

# WASD + QE + mouse look fly camera. No collision — you fly through walls
# on purpose, so you can inspect the dungeon from any angle.

@export var move_speed := 8.0
@export var boost_multiplier := 3.0
@export var mouse_sensitivity := 0.002

var _yaw := 0.0
var _pitch := 0.0
var _captured := false

func _ready() -> void:
	_capture()
	_yaw = rotation.y
	_pitch = rotation.x

func _capture() -> void:
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	_captured = true

func _release() -> void:
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	_captured = false

func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseMotion and _captured:
		var m := event as InputEventMouseMotion
		_yaw -= m.relative.x * mouse_sensitivity
		_pitch -= m.relative.y * mouse_sensitivity
		_pitch = clamp(_pitch, deg_to_rad(-85.0), deg_to_rad(85.0))
		rotation = Vector3(_pitch, _yaw, 0.0)
	elif event is InputEventKey and event.pressed and event.keycode == KEY_ESCAPE:
		_release()
	elif event is InputEventMouseButton and event.pressed and not _captured:
		_capture()

func _process(delta: float) -> void:
	var input := Vector3.ZERO
	if Input.is_key_pressed(KEY_W): input.z -= 1.0
	if Input.is_key_pressed(KEY_S): input.z += 1.0
	if Input.is_key_pressed(KEY_A): input.x -= 1.0
	if Input.is_key_pressed(KEY_D): input.x += 1.0
	if Input.is_key_pressed(KEY_E): input.y += 1.0
	if Input.is_key_pressed(KEY_Q): input.y -= 1.0

	var speed := move_speed
	if Input.is_key_pressed(KEY_SHIFT):
		speed *= boost_multiplier

	if input == Vector3.ZERO:
		return

	# Horizontal movement is yaw-relative; vertical stays in world space.
	var yaw_basis := Basis(Vector3.UP, _yaw)
	var dir := yaw_basis * Vector3(input.x, 0.0, input.z)
	dir.y = input.y
	dir = dir.normalized()
	position += dir * speed * delta