extends RichTextLabel

export(PoolColorArray) var char_colors = PoolColorArray()
export var fade_step_time = 0.1
export var do_autostart = true
export var char_delta = 1.0
export var char_step = 0.01
export var time_until_fadeout = 1.0

var fade_timer
var wait_timer
var delta
var current_max_index
var last_index_delta
var fadein

func set_bbcode_opacity():
	var new_bbcode = str("")
	
	for i in min(char_colors.size(), text.length()):
		if i <= current_max_index:
			if fadein == true:
				char_colors[i].a = min(char_colors[i].a + char_step, 1.0)
			else:
				char_colors[i].a = max(char_colors[i].a - char_step, 0.0)
		new_bbcode += "[color=#" + char_colors[i].to_html(true) + "]" + text[i] + "[/color]"

	set_bbcode(new_bbcode)
	
	if char_colors[char_colors.size() - 1].a == 1.0 and fadein == true:
		fade_timer.stop()
		wait_timer.start()

func set_next_char():
	last_index_delta = delta
	current_max_index = min(current_max_index + 1, text.length())

func reset(_fadein = true):
	delta = 0
	current_max_index = 0
	last_index_delta = delta
	fadein = _fadein

func _ready():
	if char_colors.size() > text.length() or char_colors.size() == 0:
		push_error (str(self.name) + ": Size of character colors more than the text length: " + str(char_colors.size()) + " > " + str(text.length()))
		get_tree().quit(-1)

	if char_colors.size() < text.length():
		var i = char_colors.size() - 1
		while i < text.length() - 1:
			char_colors.append(char_colors[i])
			i += 1

	for i in char_colors.size():
		char_colors[i].a = 0.0

	current_max_index = -1
	set_bbcode_opacity()
	reset(true)
	
	fade_timer = Timer.new()
	fade_timer.set_one_shot(false)
	fade_timer.set_wait_time(fade_step_time)
	fade_timer.set_autostart(do_autostart)
	fade_timer.connect("timeout", self, "_fade_timer_callback")
	add_child(fade_timer)

	wait_timer = Timer.new()
	wait_timer.set_one_shot(true)
	wait_timer.set_wait_time(time_until_fadeout)
	wait_timer.set_autostart(false)
	wait_timer.connect("timeout", self, "_wait_timer_callback")
	add_child(wait_timer)

func _process(_delta):
	delta += _delta

func _fade_timer_callback():
	if current_max_index >= 0:
		if delta > last_index_delta + char_delta:
			set_next_char()

		set_bbcode_opacity()

func _wait_timer_callback():
	reset(false)
	fade_timer.start()