import 'package:flutter/foundation.dart';

/// The five root tabs, in their declared (and displayed) order. Declaration
/// order IS the tab order — the single source shared by `_paginas` and
/// `_navItems` in app.dart (Design ADR-8).
enum RaizPluriWave { escuchar, buscar, favoritos, alarmas, ajustes }

/// Root-to-root navigation state (Design ADR-8). The single source of truth
/// for which of the 5 root tabs is active. Switching roots is a plain
/// notifier update — it never pushes a route.
class EstadoNavegacionRaiz extends ChangeNotifier {
  RaizPluriWave _actual = RaizPluriWave.escuchar;

  RaizPluriWave get actual => _actual;

  /// Declaration order doubles as the bottom-nav index.
  int get indice => _actual.index;

  void irA(RaizPluriWave raiz) {
    if (raiz == _actual) return;
    _actual = raiz;
    notifyListeners();
  }
}