extends SceneTree

# Headless test: run with
#   godot --headless -s res://tests/test_dialog_typing.gd
# Forgejo #149: "les dialogues doivent arriver petit a petit, avec un VFX
# associe a des dialogues de science fiction" - dialogs should arrive bit by
# bit, with an effect that reads as science fiction.
#
# The failure worth guarding against is not "it does not type" - it is the
# one that comes with typing: a player clicking at their usual pace skips
# the second line entirely, having never seen a word of it. #127 exists to
# stop exactly that, so a press on a line still arriving has to finish it
# rather than dismiss it.
#
# Covers:
#   A. a line arrives a character at a time rather than all at once
#   B. the text itself is set whole and REVEALED - growing the string would
#      re-wrap the line every frame and make words jump between rows
#   C. a press on a line still arriving finishes it and does not dismiss it
#   D. a press on a finished line dismisses it, as it always did
#   E. it types while the game is stopped, being the one node still running
#   F. the sci-fi part: the panel is drawn differently while decoding, and
#      settles when the line is complete

var game_state: Node
var scene: Node
var narration: Control
var stage: int = 0
var elapsed: float = 0.0
var first_line: String = ""
var seen: Array = []


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()
	game_state.intro_active = false
	game_state.reset_quests()


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


func _click() -> void:
	var press: InputEventMouseButton = InputEventMouseButton.new()
	press.button_index = MOUSE_BUTTON_LEFT
	press.pressed = true
	narration._unhandled_input(press)


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			scene = load("res://world/Main.tscn").instantiate()
			root.add_child(scene)
			current_scene = scene
			narration = scene.get_node("UI/NarrationBanner")
			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < 0.3:
				return false
			first_line = "Convoy Kestrel, this is a long enough line that decoding it takes a moment."
			narration.say(first_line, "TEST")
			narration.say("And a second one behind it.", "TEST")

			# --- A and B. it arrives, and the text is whole ----------
			if not narration.is_typing():
				return _fail("the line was complete the instant it was said")
			if narration.label.text != first_line:
				return _fail("the label holds a partial string - the line will re-wrap as it types")
			if narration.label.visible_characters < 0:
				return _fail("the whole line is visible already")
			seen.append(narration.label.visible_characters)

			# Hand-ticked, so the reveal is measured rather than raced. The
			# banner processes while the tree is stopped (#128), which is E.
			if not paused:
				return _fail("a dialog did not stop the game")
			for i in range(12):
				narration._process(1.0 / 60.0)
				seen.append(narration.label.visible_characters)
			var rising: int = 0
			for i in range(1, seen.size()):
				if int(seen[i]) > int(seen[i - 1]):
					rising += 1
			if rising < 6:
				return _fail("the reveal advanced on only %d of %d frames" % [rising, seen.size() - 1])
			if int(seen[-1]) >= first_line.length():
				return _fail("the whole line decoded within 12 frames - that is not arriving")
			print("typed while the game was stopped: %d -> %d of %d characters over 12 frames" \
				% [seen[0], seen[-1], first_line.length()])

			# --- F. and it looks like it is working ------------------
			# is_typing() is the flag _draw() branches on for the sweep, the
			# write-head caret and the frame's charge, so its transition IS
			# the effect changing. Checked rather than calling _draw() by
			# hand, which Godot refuses outside a paint.
			if not narration.is_typing():
				return _fail("the test's own ticking finished the line")
			narration.queue_redraw()
			narration.finish_typing()
			if narration.is_typing():
				return _fail("finish_typing() left the line still arriving")
			if narration.label.visible_characters != -1:
				return _fail("a finished line is still hiding characters")
			if narration.SWEEP_SECONDS <= 0.0 or narration.CHARS_PER_SECOND <= 0.0:
				return _fail("the decode has no rate to run at")
			print("decoding while arriving, settled when it lands (%.0f chars/s, %.1fs sweep)" \
				% [narration.CHARS_PER_SECOND, narration.SWEEP_SECONDS])

			# --- C. a press finishes rather than dismisses -----------
			narration.say(first_line, "TEST")
			# say() queues behind the current line, so start it cleanly.
			narration.clear()
			narration.say(first_line, "TEST")
			narration.say("Second.", "TEST")
			if not narration.is_typing():
				return _fail("the fresh line was not arriving")
			_click()
			if narration.is_typing():
				return _fail("a press did not finish a line that was still arriving")
			if narration.current != first_line:
				return _fail("a press on an arriving line dismissed it - the next line would be skipped unread")
			print("a press on an arriving line finishes it, and does not move on")

			# --- D. and the next press does move on ------------------
			_click()
			if narration.current == first_line:
				return _fail("a press on a finished line did not dismiss it")
			if narration.current != "Second.":
				return _fail("dismissing landed on \"%s\"" % narration.current)
			print("the press after that moves on to \"%s\"" % narration.current)

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