extends SceneTree

# Headless test: run with
#   godot --headless -s res://tests/test_dialog_pause.gd
# Forgejo #128: "When a dialog appears, no command should work and the game
# physics should be paused as long as the message is not acknowledged."
#
# Two claims, and they are checked separately because they can fail
# separately: the world must STOP, and the controls must not ANSWER. Presses
# are pushed through the viewport rather than handed to a handler directly -
# calling a handler by hand would prove nothing about whether the engine
# would have delivered the event at all, which is the whole question here.
#
# What a press does while a dialog is up is ACKNOWLEDGE it (#127) and
# nothing else. So "no command works" is not "the press vanishes": it is
# "the press reached the dialog and reached nothing else", and that is what
# is asserted below.
#
# Covers:
#   A. a line goes up and the tree is paused
#   B. the world is frozen: the fleet holds still under a movement order
#   C. GameState's own clock is frozen too - the wave clock does not run
#   D. no command works: a press on a HUD button, delivered the way a finger
#      delivers one, acknowledges the dialog and does not fire the button
#   E. queued lines hold the pause until the LAST one is acknowledged
#   F. after the last one, the world runs and the same press does fire
#   G. leaving the tree with a line up does not leave the game stopped with
#      nothing left that could start it again

var game_state: Node
var scene: Node
var fleet: Node2D
var narration: Control
var button: Control
var build_menu: Control
var presses: int = 0
var stage: int = 0
var elapsed: float = 0.0
var frozen_at: Vector2 = Vector2.ZERO
var frozen_wave_timer: float = 0.0


func _initialize() -> void:
	# GameState is an autoload: a bare GameState.<instance member> does not
	# compile in a SceneTree script, so the node is fetched by name instead.
	game_state = root.get_node("GameState")
	game_state.reset_new_game()
	# Not the prologue. The prologue has its own dialog coverage
	# (test_intro_scene); this is about dialogs in the ordinary game, where
	# there are commands to block in the first place.
	game_state.intro_active = false
	# And no quest chain. Quest briefings are dialogs too (#132), and this
	# test is about what a dialog DOES - it needs to be the one deciding
	# when one appears.
	game_state.reset_quests()
	game_state.rocks = 500


func _fail(message: String) -> bool:
	print("TEST_DIALOG_PAUSE: FAIL (%s)" % message)
	quit(1)
	return true


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


# A press delivered the way the player delivers one: through the viewport, at
# the button's own screen rect, so the engine's routing decides whether it
# arrives rather than the test deciding for it.
func _press_button() -> void:
	var at: Vector2 = button.get_global_rect().get_center()
	for is_down in [true, false]:
		var event: InputEventMouseButton = InputEventMouseButton.new()
		event.button_index = MOUSE_BUTTON_LEFT
		event.pressed = is_down
		event.position = at
		event.global_position = at
		# in_local_coords, deliberately. The other form runs the position
		# through the window's screen transform, and headless has no window -
		# the event then lands nowhere and the button looks broken.
		root.push_input(event, true)


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			scene = load("res://world/Main.tscn").instantiate()
			root.add_child(scene)
			current_scene = scene
			fleet = scene.get_node("Fleet")
			narration = scene.get_node("UI/NarrationBanner")
			button = scene.get_node("UI/BuildButton")
			build_menu = scene.get_node("UI/BuildMenu")
			button.pressed.connect(_on_pressed)
			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < 0.4:
				return false
			if paused:
				return _fail("the game was already stopped before any dialog")
			# The button answers when nothing is in the way. Without this
			# baseline, D below would prove only that the button was
			# unreachable all along.
			presses = 0
			_press_button()
			elapsed = 0.0
			stage = 2
			return false
		2:
			if elapsed < 0.2:
				return false
			if presses == 0:
				return _fail("the build button does not answer a press even with no dialog up")
			print("baseline: a press on the build button fires it")
			# It opened the build menu, which is modal and would block every
			# later press for a reason that has nothing to do with #128.
			build_menu.visible = false

			# --- A. a line stops the game ----------------------------
			narration.say("Hold position.", "TEST")
			narration.say("And stand by.", "TEST")
			if not paused:
				return _fail("a dialog went up and the game kept running")
			print("dialog up: the tree is paused")

			frozen_at = fleet.get_centroid()
			frozen_wave_timer = game_state.wave_timer
			# Ordered somewhere it is nowhere near, so even a little drift
			# would show up. steer_direction persists, so this order stands
			# for the whole frozen second below.
			fleet.move_in_direction(Vector2.RIGHT)
			presses = 0
			elapsed = 0.0
			stage = 3
			return false
		3:
			# --- B and C. a whole second of frozen world -------------
			if elapsed < 1.0:
				return false
			var moved: float = fleet.get_centroid().distance_to(frozen_at)
			if moved > 0.5:
				return _fail("the fleet drifted %.1fpx while a dialog was up" % moved)
			print("fleet held still for 1s under a movement order (%.2fpx)" % moved)
			var ran: float = absf(game_state.wave_timer - frozen_wave_timer)
			if ran > 0.001:
				return _fail("the wave clock ran on %.2fs while a dialog was up" % ran)
			print("the wave clock did not advance")

			# --- D. the press acknowledges, and does nothing else ----
			_press_button()
			if presses != 0:
				return _fail("the build button fired while a dialog was up")
			if build_menu.visible:
				return _fail("the build menu opened from a press meant for the dialog")
			print("a press while the dialog was up did not reach the button")

			# --- E. the queued line keeps the game stopped -----------
			if not narration.is_speaking():
				return _fail("one press acknowledged both queued lines")
			if not paused:
				return _fail("the game restarted with a line still on screen")
			print("a second queued line keeps the game stopped")

			_press_button()
			if presses != 0:
				return _fail("the build button fired on the acknowledging press")
			if narration.is_speaking():
				return _fail("the banner is still speaking after the last line")
			if paused:
				return _fail("the last line was acknowledged and the game is still stopped")
			print("last line acknowledged: the game is running again")

			frozen_at = fleet.get_centroid()
			presses = 0
			elapsed = 0.0
			stage = 4
			return false
		4:
			# --- F. and the world answers again ----------------------
			if elapsed < 0.4:
				return false
			if fleet.get_centroid().distance_to(frozen_at) < 1.0:
				return _fail("the fleet is still frozen after the dialog closed")
			_press_button()
			if presses == 0:
				return _fail("the build button stayed dead after the dialog closed")
			build_menu.visible = false
			print("the world moves again: the fleet flies and the button fires")

			# --- G. torn down mid-line ------------------------------
			narration.say("Interrupted.", "TEST")
			if not paused:
				return _fail("the dialog did not stop the game the second time")
			scene.free()
			scene = null
			if paused:
				return _fail("the scene was torn down mid-dialog and left the game stopped")
			print("a scene torn down mid-dialog leaves the game running")

			print("TEST_DIALOG_PAUSE: PASS")
			quit(0)
			return true
	return false