// lib/features/recycling_guide/presentation/providers/recycling_provider.dart
// Riverpod — compatible con lo que usa Persona C en el resto de la app.

import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../data/repositories/recycling_repository.dart';
import '../../domain/entities/recycling_category.dart';

// ── Repositorio singleton ────────────────────────────────────────────
final recyclingRepositoryProvider = Provider<RecyclingRepository>(
  (ref) => RecyclingRepository(),
);

// ── Categorías (carga inicial desde JSON) ────────────────────────────
final recyclingCategoriesProvider =
    FutureProvider<List<RecyclingCategory>>((ref) {
  return ref.watch(recyclingRepositoryProvider).obtenerCategorias();
});

// ── Estado del buscador ──────────────────────────────────────────────
class RecyclingSearchNotifier extends StateNotifier<RecyclingSearchState> {
  final RecyclingRepository _repo;

  RecyclingSearchNotifier(this._repo)
      : super(const RecyclingSearchState.idle());

  Future<void> buscar(String query) async {
    if (query.trim().isEmpty) {
      state = const RecyclingSearchState.idle();
      return;
    }
    state = const RecyclingSearchState.loading();
    final resultados = await _repo.buscar(query);
    state = RecyclingSearchState.done(resultados);
  }

  void limpiar() => state = const RecyclingSearchState.idle();
}

final recyclingSearchProvider =
    StateNotifierProvider<RecyclingSearchNotifier, RecyclingSearchState>((ref) {
  return RecyclingSearchNotifier(ref.watch(recyclingRepositoryProvider));
});

// ── Estado sellado del buscador ──────────────────────────────────────
sealed class RecyclingSearchState {
  const RecyclingSearchState();

  const factory RecyclingSearchState.idle() = Idle;
  const factory RecyclingSearchState.loading() = Loading;
  const factory RecyclingSearchState.done(List<SearchResult> results) = Done;
}

class Idle extends RecyclingSearchState {
  const Idle();
}

class Loading extends RecyclingSearchState {
  const Loading();
}

class Done extends RecyclingSearchState {
  final List<SearchResult> results;
  const Done(this.results);
}