extends GutTest
## The input packet is the only thing a client can put on the wire, so its
## bounds are a security surface as much as a format.


func _round_trip(f: InputFrame) -> InputFrame:
	var b := StreamPeerBuffer.new()
	b.big_endian = false
	f.write(b)
	b.seek(0)
	return InputFrame.read(b)


func test_round_trip_preserves_tick_and_buttons() -> void:
	var f := InputFrame.make(123456, Vector2(0.5, -0.25), 1.75,
		InputFrame.BTN_FIRE | InputFrame.BTN_ESCAPE)
	var out := _round_trip(f)
	assert_eq(out.tick, 123456)
	assert_true(out.pressed(InputFrame.BTN_FIRE))
	assert_true(out.pressed(InputFrame.BTN_ESCAPE))
	assert_false(out.pressed(InputFrame.BTN_INTERACT))


func test_move_survives_quantisation_within_tolerance() -> void:
	var out := _round_trip(InputFrame.make(1, Vector2(0.5, -0.25), 0.0, 0))
	assert_almost_eq(out.move.x, 0.5, 0.01)
	assert_almost_eq(out.move.y, -0.25, 0.01)


func test_aim_survives_quantisation() -> void:
	var out := _round_trip(InputFrame.make(1, Vector2.ZERO, 2.5, 0))
	assert_almost_eq(out.aim, 2.5, 0.001)


func test_oversized_move_cannot_be_expressed_on_the_wire() -> void:
	var out := _round_trip(InputFrame.make(1, Vector2(50.0, 50.0), 0.0, 0))
	assert_lt(out.move.length(), 1.45, "the byte encoding must cap the move vector")


func test_frame_is_exactly_the_declared_size() -> void:
	var b := StreamPeerBuffer.new()
	InputFrame.make(1, Vector2.ONE, 1.0, 7).write(b)
	assert_eq(b.data_array.size(), InputFrame.SIZE)