## An array of notes, stored as arrays of data.
## Notes are assumed to be sorted in ascending order by beat.
class_name NoteArray extends Node

## The ID of the note at [param index].
func id_at(index: int) -> int:
	return index

## The beat of the note at [param index].
func beat_at(index: int) -> float:
	return _beats.get(index)

## The type of the note at [param index].
func type_at(index: int) -> Note.TYPE:
	return _types.get(index)

## The lane of the note at [param index].
func lane_at(index: int) -> int:
	return _lanes.get(index)

## The number of notes in the array.
func size() -> int:
	return _beats.size()

## Remove all notes in the array.
func clear() -> void:
	_beats = []
	_types = []
	_lanes = []

# ======= IMPLEMENTATION ======= #
var _beats: Array[float] = []
var _types: Array[Note.TYPE] = []
var _lanes: Array[int] = []

func _append_note(note: Note) -> void:
	_beats.append(note.hit_beat)
	_types.append(note.type)
	_lanes.append(note.lane)

func _append_note_data(beat: float, type: Note.TYPE, lane: int) -> void:
	_beats.append(beat)
	_types.append(type)
	_lanes.append(lane)