class_name VNTextbox extends PanelContainer

const VN_REVEAL_TIME = 0.01
const VISIBLE_LINES:int = 4

var label:RichTextLabel;
var text:String = ""
var parsedOutText = ""
var visibleCharacters:int = 0;
var revealTimer:float = 0;

var lineStarts:Array[int] = [];
var newlineIndexes:Array[int] = [];
var wrappedText:String = "";
var currentLine = 0;
var currentViewScrolled = true;
var isSpeedupDown = false;
var isMoreViews = false;
var isClosed = true;

func _ready() -> void:
	label = $MarginContainer/Label
	self.visible = false;

func _process(delta: float) -> void:
	if text == "":
		return;
		
	if currentViewScrolled:
		if Input.is_action_just_pressed("interact"):
			if isMoreViews:
				visibleCharacters = 0;
				currentLine += VISIBLE_LINES;
				currentViewScrolled = false;
				recalculateWrapping();
				return
			isClosed = true;
			setText("");
		return;

	if visibleCharacters >= getCountOfCharactersToScrollInView():
		currentViewScrolled = true;
		#print("Scrolled view");
		#if isMoreViews:
			#print("More views");
		return;

	if Input.is_action_just_pressed("interact"):
		isSpeedupDown = true;
	elif Input.is_action_just_released("interact"):
		isSpeedupDown = false;
	elif !Input.is_action_pressed("interact"):
		isSpeedupDown = false;

	revealTimer += delta;
	if isSpeedupDown:
		revealTimer += delta;

	if revealTimer > VN_REVEAL_TIME:
		revealTimer = 0;
		visibleCharacters += 1;
		label.visible_characters = visibleCharacters;

func getCountOfCharactersToScrollInView() -> int:
	if lineStarts.size() <= VISIBLE_LINES:
		return wrappedText.length();
	if currentLine + VISIBLE_LINES >= lineStarts.size():
		return wrappedText.length() - lineStarts[currentLine];
	return lineStarts[min(lineStarts.size(), currentLine + VISIBLE_LINES)] - lineStarts[currentLine];

func recalculateWrapping():
	# Reset label to default.
	label.text = text;
	label.visible_characters = -1;
	label.fit_content = true;
	isMoreViews = false;

	# Determine where the wrapped newlines are
	lineStarts = [ 0 ];
	var line = 0;
	var wasNewLine = false;
	for i in range(0, text.length()):
		var tLine = label.get_character_line(i);
		if tLine == line:
			wasNewLine = false
			if text[i] == "\n":
				wasNewLine = true
			continue;
		if !wasNewLine:
			newlineIndexes.append(i);
		lineStarts.append(i);
		line = tLine;

	# Create fake pre-wrapped text.
	wrappedText = "";
	for i in range(lineStarts[currentLine], text.length()):
		if newlineIndexes.find(i) != -1 and i != lineStarts[currentLine]:
			wrappedText += "\n";
		wrappedText += text[i];
	
	label.text = wrappedText;
	label.fit_content = false;
	label.visible_characters = 0;

	if lineStarts.size() > currentLine + VISIBLE_LINES:
		isMoreViews = true;

func setText(text:String) -> void:
	self.text = text;
	if text == "":
		isClosed = true;
		self.visible = false;
		return;

	isClosed = false;
	revealTimer = 0;
	visibleCharacters = 0;
	currentLine = 0;
	currentViewScrolled = false;
	recalculateWrapping();
	self.visible = true;