class_name ChartEvent
extends Resource

@export var event_id: StringName = &""
@export var beat_index := 0
@export var subdivision := 0
@export var subdivisions_per_beat := 1
@export var event_type: StringName = &""
@export var target_id: StringName = &""
@export var payload: Dictionary = {}
@export var lead_beats := 1.0


func beat_position() -> float:
	var safe_subdivisions := maxi(1, subdivisions_per_beat)
	return float(beat_index) + float(subdivision) / float(safe_subdivisions)


func time_seconds(beat_time: float) -> float:
	return beat_position() * maxf(0.001, beat_time)


func key() -> StringName:
	if not event_id.is_empty():
		return event_id
	return StringName("%s:%s:%d:%d" % [event_type, target_id, beat_index, subdivision])