extends SceneTree

# Headless test: run with
#   godot --headless -s res://tests/test_icon_button_press_fires.gd
# A browser on a phone delivers the touch DOWN and never delivers the
# release. Measured on the deployed web build: presses arrived with correct
# coordinates, landed inside the button, the button latched into its held
# state, and no release ever followed. IconButton emits `pressed` only on
# release, so on the web nothing ever fired - the "Play does nothing" bug.
#
# fire_on_press exists for exactly that platform. This test does not care
# whether THIS run is a web build; it exercises both settings directly, which
# is the only way a headless Linux run can cover the web path at all.
#
# Covers:
#   A. with fire_on_press, a press alone emits - and emits ONCE even if a
#      release does arrive after it
#   B. with fire_on_press, the button does not stay latched in its held
#      state (nothing is coming to clear it)
#   C. without it, the release still drives the press, and dragging off
#      still cancels - the behaviour every other platform keeps
#   D. the default follows OS.has_feature("web")
#
# There is deliberately NO test for bypassing Godot's GUI routing. An earlier
# attempt did that, on the theory that touches were not reaching Controls at
# all - the device then reported `held=y`, proving the button had been
# receiving presses through ordinary routing the whole time. The bypass was
# solving a problem that did not exist, and its set_input_as_handled() call
# swallowed the very events the on-screen probe was reading.

var presses: int = 0


func _initialize() -> void:
	var button_script: GDScript = load("res://ui/IconButton.gd")

	# --- D. the default is the platform rule --------------------------
	var default_button: Control = button_script.new()
	default_button.size = Vector2(120, 120)
	if default_button.fire_on_press != OS.has_feature("web"):
		return _fail("fire_on_press defaults to %s, expected OS.has_feature('web') = %s" \
			% [default_button.fire_on_press, OS.has_feature("web")])
	default_button.free()
	print("fire_on_press defaults to the web feature flag (%s here)" % OS.has_feature("web"))

	# --- A + B. the web path ------------------------------------------
	var web_button: Control = button_script.new()
	web_button.size = Vector2(120, 120)
	web_button.fire_on_press = true
	web_button.pressed.connect(_count)
	root.add_child(web_button)

	presses = 0
	web_button._handle_press(true, Vector2(60, 60))
	if presses != 1:
		return _fail("a press alone emitted %d times with fire_on_press, expected 1" % presses)
	if web_button.pressed_down:
		return _fail("the button latched held with fire_on_press - nothing will ever clear it")
	# A release may still arrive on a platform that sends one; it must not
	# produce a second press for the same tap.
	web_button._handle_press(false, Vector2(60, 60))
	if presses != 1:
		return _fail("a release after a fired press emitted again (%d total)" % presses)
	print("fire_on_press: one tap emits exactly once and does not latch")

	# --- C. every other platform --------------------------------------
	var native_button: Control = button_script.new()
	native_button.size = Vector2(120, 120)
	native_button.fire_on_press = false
	native_button.pressed.connect(_count)
	root.add_child(native_button)

	presses = 0
	native_button._handle_press(true, Vector2(60, 60))
	if presses != 0:
		return _fail("a press emitted without a release while fire_on_press was off")
	if not native_button.pressed_down:
		return _fail("the button did not latch held while waiting for its release")
	native_button._handle_press(false, Vector2(60, 60))
	if presses != 1:
		return _fail("the release did not emit (%d)" % presses)

	# Dragging off before lifting still cancels.
	presses = 0
	native_button._handle_press(true, Vector2(60, 60))
	native_button._handle_press(false, Vector2(400, 400))
	if presses != 0:
		return _fail("releasing outside the button still counted as a press")
	print("release path unchanged: release fires, dragging off cancels")

	print("TEST_ICON_BUTTON_PRESS_FIRES: PASS")
	quit(0)


func _count() -> void:
	presses += 1


func _fail(message: String) -> void:
	print("TEST_ICON_BUTTON_PRESS_FIRES: FAIL (%s)" % message)
	quit(1)