extends GdUnitTestSuite
## ButtonBounce: buttons grow under the mouse, shrink while held down, pop when asked to,
## and always around their middle.

var _button: Button


func before_test() -> void:
	_button = auto_free(Button.new())
	_button.size = Vector2(40, 40)
	add_child(_button)
	ButtonBounce.add_to(_button)


func _settle() -> void:
	await await_millis(int(maxf(ButtonBounce.DURATION, ButtonBounce.POP_DURATION) * 1000) + 80)


func test_starts_at_its_normal_size_scaled_around_its_middle() -> void:
	assert_vector(_button.scale).is_equal(Vector2.ONE)
	assert_vector(_button.pivot_offset).is_equal(Vector2(20, 20))


func test_pivot_follows_the_size() -> void:
	_button.size = Vector2(60, 30)

	assert_vector(_button.pivot_offset).is_equal(Vector2(30, 15))


func test_grows_when_the_mouse_enters_and_shrinks_back_when_it_leaves() -> void:
	_button.mouse_entered.emit()
	await _settle()
	assert_vector(_button.scale).is_equal_approx(ButtonBounce.HOVER_SCALE, Vector2(0.01, 0.01))

	_button.mouse_exited.emit()
	await _settle()
	assert_vector(_button.scale).is_equal_approx(Vector2.ONE, Vector2(0.01, 0.01))


func test_shrinks_while_held_down() -> void:
	_button.button_down.emit()
	await _settle()

	assert_vector(_button.scale).is_equal_approx(ButtonBounce.PRESSED_SCALE, Vector2(0.01, 0.01))


func test_goes_back_to_normal_when_let_go_away_from_the_mouse() -> void:
	_button.button_down.emit()
	await _settle()

	_button.button_up.emit()
	await _settle()

	assert_vector(_button.scale).is_equal_approx(Vector2.ONE, Vector2(0.01, 0.01))


func test_disabled_button_does_not_grow() -> void:
	_button.disabled = true

	_button.mouse_entered.emit()
	await _settle()

	assert_vector(_button.scale).is_equal(Vector2.ONE)


func test_pop_starts_small_and_springs_back() -> void:
	ButtonBounce.pop(_button)

	assert_vector(_button.scale).is_equal(ButtonBounce.POP_SCALE)
	await _settle()
	assert_vector(_button.scale).is_equal_approx(Vector2.ONE, Vector2(0.01, 0.01))


func test_a_new_animation_stops_the_one_before() -> void:
	_button.mouse_entered.emit()
	_button.button_down.emit()
	await _settle()

	# Only the last one ran to the end
	assert_vector(_button.scale).is_equal_approx(ButtonBounce.PRESSED_SCALE, Vector2(0.01, 0.01))