Refactor rhythm action architecture

scenes/components/combo_window.gd

@@ -0,0 +1,108 @@
+class_name ComboWindow
+extends Node
+
+signal combo_updated(inputs: Array[StringName])
+signal combo_cleared(reason: StringName)
+
+@export var size := 4
+@export var clear_display_time := 0.35
+
+var slots: Array[StringName] = []
+var pending_clear_reason: StringName = &""
+var _timer: Timer
+
+
+func _ready() -> void:
+	_timer = Timer.new()
+	_timer.one_shot = true
+	_timer.timeout.connect(flush_pending_clear)
+	add_child(_timer)
+
+
+func record(input: StringName) -> void:
+	if input.is_empty():
+		return
+	slots.append(input)
+	combo_updated.emit(get_slots())
+	_emit_bus_signal("combo_updated", [get_slots()])
+	if slots.size() >= size:
+		queue_clear(&"full")
+
+
+func get_slots() -> Array[StringName]:
+	return slots.duplicate()
+
+
+func has_pending_clear() -> bool:
+	return not pending_clear_reason.is_empty()
+
+
+func consume_pending_clear_reason() -> StringName:
+	var reason := pending_clear_reason
+	pending_clear_reason = &""
+	return reason
+
+
+func get_pattern() -> String:
+	var pattern := ""
+	for slot: StringName in slots:
+		if slot != &"Ø":
+			pattern += str(slot)
+	return pattern
+
+
+func get_contiguous_pattern() -> String:
+	var pattern := ""
+	for index: int in range(slots.size() - 1, -1, -1):
+		var slot := slots[index]
+		if slot == &"Ø":
+			break
+		pattern = str(slot) + pattern
+	return pattern
+
+
+func queue_clear(reason: StringName, delay := -1.0) -> void:
+	pending_clear_reason = reason
+	if _timer == null:
+		return
+	_timer.stop()
+	_timer.wait_time = clear_display_time if delay < 0.0 else delay
+	_timer.start()
+
+
+func cancel_pending_clear() -> void:
+	pending_clear_reason = &""
+	if _timer != null:
+		_timer.stop()
+
+
+func flush_pending_clear() -> void:
+	var reason := consume_pending_clear_reason()
+	if reason.is_empty():
+		return
+	if _timer != null:
+		_timer.stop()
+	clear(reason)
+
+
+func clear(reason: StringName = &"") -> void:
+	slots.clear()
+	pending_clear_reason = &""
+	combo_cleared.emit(reason)
+	_emit_bus_signal("combo_cleared", [reason])
+	combo_updated.emit(get_slots())
+	_emit_bus_signal("combo_updated", [get_slots()])
+
+
+func _emit_bus_signal(signal_name: StringName, args: Array) -> void:
+	if not is_inside_tree():
+		return
+	var bus := _event_bus_or_null()
+	if bus != null:
+		bus.emit_signal(signal_name, args[0])
+
+
+func _event_bus_or_null() -> Node:
+	if not is_inside_tree():
+		return null
+	return get_tree().root.get_node_or_null("EventBus")