extends Control
## #592: News ticker — scrolling horizontal headline bar, active in The Last Shift zone.
## Lives on UILayer (z-layer 7 per D-049). Not suppressed by insert_active (D-013):
## the ticker is a real-world screen the player can see regardless of insert state.
## Text scrolls left at SCROLL_SPEED px/sec. When current_ticker is null, hides.

const BG_COLOR := Color(0.05, 0.05, 0.07, 0.75)
const TEXT_COLOR := Color(0.784, 0.816, 0.878, 1.0)  # INSERT_COLOR_TEXT
const FONT_SIZE := 13
const SCROLL_SPEED := 60.0  # pixels per second
const BAR_HEIGHT := 28

var _text: String = ""
var _scroll_x: float = 0.0
var _content_width: float = 0.0

@onready var _label: Label = $TickerLabel


func _ready() -> void:
	mouse_filter = Control.MOUSE_FILTER_IGNORE
	_label.add_theme_font_size_override("font_size", FONT_SIZE)
	_label.add_theme_color_override("font_color", TEXT_COLOR)
	visible = false


func update_from_state() -> void:
	var ticker: Variant = GameState.current_snapshot.get("current_ticker")
	if ticker == null or not ticker is Dictionary:
		visible = false
		return
	var new_text: String = ticker.get("text", "")
	if new_text.is_empty():
		visible = false
		return
	if new_text != _text:
		_text = new_text
		_label.text = _text
		# Reset scroll to start from right edge on new headline.
		# Defer width read by one frame: get_minimum_size() returns stale
		# data if called before the layout pass that follows text assignment.
		_scroll_x = size.x
		_content_width = 0.0  # will be updated after layout in _process
		call_deferred("_update_content_width")
	visible = true


func _update_content_width() -> void:
	_content_width = _label.get_minimum_size().x


func _process(delta: float) -> void:
	if not visible:
		return
	_scroll_x -= SCROLL_SPEED * delta
	# Restart from right edge when text has fully exited left.
	if _scroll_x + _content_width < 0.0:
		_scroll_x = size.x
	_label.position.x = _scroll_x