extends CanvasLayer
## Top-bar HUD: speed/pause buttons and tick counter.
##
## Buttons call Sim.set_speed(); active button is yellow-tinted.
## Tick label updates on every EventBus.sim_tick signal.
## Keyboard shortcuts (pause / speed_normal / speed_fast / speed_ultra) are
## handled here so the bar is the single owner of speed-input logic.

const ACTIVE_MODULATE := Color(1.2, 1.2, 0.8)
const IDLE_MODULATE   := Color.WHITE

@onready var pause_btn  : Button = $Anchor/ButtonRow/PauseBtn
@onready var normal_btn : Button = $Anchor/ButtonRow/NormalBtn
@onready var fast_btn   : Button = $Anchor/ButtonRow/FastBtn
@onready var ultra_btn  : Button = $Anchor/ButtonRow/UltraBtn
@onready var tick_label : Label  = $Anchor/TickLabel

# Maps Speed enum value → the corresponding Button node.
var _speed_buttons: Dictionary = {}


func _ready() -> void:
	pause_btn.text  = Strings.t(&"speed.pause")
	normal_btn.text = Strings.t(&"speed.normal")
	fast_btn.text   = Strings.t(&"speed.fast")
	ultra_btn.text  = Strings.t(&"speed.ultra")
	tick_label.text = "(boot)"

	_speed_buttons = {
		Sim.Speed.PAUSE:  pause_btn,
		Sim.Speed.NORMAL: normal_btn,
		Sim.Speed.FAST:   fast_btn,
		Sim.Speed.ULTRA:  ultra_btn,
	}

	pause_btn.pressed.connect(func() -> void: Sim.set_speed(Sim.Speed.PAUSE))
	normal_btn.pressed.connect(func() -> void: Sim.set_speed(Sim.Speed.NORMAL))
	fast_btn.pressed.connect(func() -> void: Sim.set_speed(Sim.Speed.FAST))
	ultra_btn.pressed.connect(func() -> void: Sim.set_speed(Sim.Speed.ULTRA))

	EventBus.speed_changed.connect(_on_speed_changed)
	EventBus.sim_tick.connect(_on_sim_tick)

	# Reflect the initial speed state without emitting a signal.
	_apply_highlight(Sim.current_speed)


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("pause"):
		Sim.set_speed(Sim.Speed.PAUSE)
	elif event.is_action_pressed("speed_normal"):
		Sim.set_speed(Sim.Speed.NORMAL)
	elif event.is_action_pressed("speed_fast"):
		Sim.set_speed(Sim.Speed.FAST)
	elif event.is_action_pressed("speed_ultra"):
		Sim.set_speed(Sim.Speed.ULTRA)


func _on_speed_changed(new_speed: int) -> void:
	_apply_highlight(new_speed as Sim.Speed)


func _on_sim_tick(tick_number: int) -> void:
	tick_label.text = Strings.t(&"hud.tick").format({"n": tick_number})


func _apply_highlight(speed: Sim.Speed) -> void:
	for s: int in _speed_buttons:
		_speed_buttons[s].modulate = ACTIVE_MODULATE if s == speed else IDLE_MODULATE