class_name Hud
extends CanvasLayer
## Text over the game: the stone count, short messages, a status line for
## playing together and a help line.

const MESSAGE_SECONDS := 2.5

var _stone := Label.new()
var _message := Label.new()
var _status := Label.new()
var _help := Label.new()
var _message_left := 0.0
var _paused := false


func _ready() -> void:
	_stone.position = Vector2(16, 12)
	_stone.add_theme_font_size_override("font_size", 22)
	_message.position = Vector2(16, 48)
	_message.add_theme_font_size_override("font_size", 18)
	_status.add_theme_font_size_override("font_size", 14)
	_status.set_anchors_and_offsets_preset(Control.PRESET_TOP_RIGHT, Control.PRESET_MODE_MINSIZE, 16)
	_status.grow_horizontal = Control.GROW_DIRECTION_BEGIN
	_help.text = tr("HELP")
	_help.add_theme_font_size_override("font_size", 14)
	for label: Label in [_stone, _message, _status, _help]:
		label.add_theme_color_override("font_outline_color", Color.BLACK)
		label.add_theme_constant_override("outline_size", 4)
		add_child(label)
	_help.set_anchors_and_offsets_preset(Control.PRESET_BOTTOM_LEFT, Control.PRESET_MODE_MINSIZE, 16)


func _process(delta: float) -> void:
	if _message_left <= 0.0:
		return
	_message_left -= delta
	if _message_left <= 0.0:
		_message.text = tr("PAUSED") if _paused else ""


func show_stone(count: int) -> void:
	_stone.text = tr("STONE_COUNT") % count


## Shows the text for `key` for a few seconds, with `values` filled into
## its placeholders.
func flash(key: String, values: Array = []) -> void:
	_message.text = tr(key) % values if not values.is_empty() else tr(key)
	_message_left = MESSAGE_SECONDS


## Shows or hides the pause notice. It stays until the game continues and
## returns when a message shown in between ends.
func show_paused(paused: bool) -> void:
	_paused = paused
	_message.text = tr("PAUSED") if paused else ""
	_message_left = 0.0


## Shows `text` in the top right corner until it is replaced.
func show_status(text: String) -> void:
	_status.text = text


## The text currently shown in the status line. Tests read it.
func status_text() -> String:
	return _status.text


## The text currently shown as a message. Tests read it.
func message() -> String:
	return _message.text


## The text currently shown as the stone count. Tests read it.
func stone_text() -> String:
	return _stone.text