fix(eq): keep valid presets when stored maps are partially corrupt

Convert the 4 EQ persistence readers (device presets, matrix presets,
device names, per-station presets) to per-entry tolerant parsing via
the shared persistencia_tolerante helper, so one corrupt entry no
longer discards every sibling preset. The principal-preset reader
gains diagnostic logging on its existing fallback path. No degraded
flag or quarantine here (unlike alarms/stations) since EQ writes are
explicit-only and presets are trivially re-creatable.

lib/servicios/servicio_ecualizador.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import '../modelos/preset_ecualizador.dart';
+import 'persistencia_tolerante.dart';
 
 class ConfiguracionEcualizador {
   const ConfiguracionEcualizador({
@@ -227,7 +228,14 @@ class ServicioEcualizador {
     await _guardarMapaStrings(prefs, _keyNombresDispositivos, nombres);
   }
 
-  /// Reads a `Map<String, PresetEcualizador>` from a SharedPreferences JSON key.
+  /// Reads a `Map<String, PresetEcualizador>` from a SharedPreferences JSON
+  /// key with per-entry tolerance (persistence-resilience D6): a value that
+  /// fails to parse is skipped and logged, its sibling entries survive and
+  /// every surviving key (including the matrix's colon-delimited
+  /// `stationUuid:deviceId` keys) is preserved byte-for-byte. A top-level
+  /// decode failure still degrades the whole map to empty (now logged too);
+  /// no flag/quarantine here — EQ presets are explicit-only writes and
+  /// trivially re-creatable (D6, intentional asymmetry vs. Alarms/Stations).
   Map<String, PresetEcualizador> _leerMapa(
     SharedPreferences prefs,
     String key,
@@ -236,13 +244,21 @@ class ServicioEcualizador {
     if (raw == null || raw.isEmpty) return {};
     try {
       final data = Map<String, dynamic>.from(jsonDecode(raw) as Map);
-      return data.map(
-        (k, v) => MapEntry(
-          k,
-          PresetEcualizador.desdeJson(Map<String, dynamic>.from(v as Map)),
+      final resultado = parseMapaTolerante<PresetEcualizador>(
+        data,
+        (valor) => PresetEcualizador.desdeJson(
+          Map<String, dynamic>.from(valor as Map),
         ),
+        subsistema: 'ecualizador',
+        coleccion: key,
+      );
+      return resultado.validas;
+    } catch (e) {
+      registrarSaltoPersistencia(
+        subsistema: 'ecualizador',
+        detalle: key,
+        razon: e.toString(),
       );
-    } catch (_) {
       return {};
     }
   }
@@ -256,14 +272,29 @@ class ServicioEcualizador {
     await prefs.setString(key, jsonEncode(serializado));
   }
 
-  /// Reads a `Map<String, String>` from a SharedPreferences JSON key.
+  /// Reads a `Map<String, String>` from a SharedPreferences JSON key with
+  /// per-entry tolerance (persistence-resilience D6): a value that is not a
+  /// String is skipped and logged, sibling entries and keys survive
+  /// untouched. A top-level decode failure still degrades the whole map to
+  /// empty (now logged too); no flag/quarantine here (D6).
   Map<String, String> _leerMapaStrings(SharedPreferences prefs, String key) {
     final raw = prefs.getString(key);
     if (raw == null || raw.isEmpty) return {};
     try {
       final data = Map<String, dynamic>.from(jsonDecode(raw) as Map);
-      return data.map((k, v) => MapEntry(k, v as String));
-    } catch (_) {
+      final resultado = parseMapaTolerante<String>(
+        data,
+        (valor) => valor as String,
+        subsistema: 'ecualizador',
+        coleccion: key,
+      );
+      return resultado.validas;
+    } catch (e) {
+      registrarSaltoPersistencia(
+        subsistema: 'ecualizador',
+        detalle: key,
+        razon: e.toString(),
+      );
       return {};
     }
   }
@@ -276,6 +307,10 @@ class ServicioEcualizador {
     await prefs.setString(key, jsonEncode(mapa));
   }
 
+  /// Reads the single principal-preset key. Single-value (not a collection)
+  /// so there is nothing to skip per-entry; a decode failure still falls
+  /// back to [PresetEcualizador.flat] (unchanged behavior) but is now
+  /// logged too (persistence-resilience D6, diagnostics).
   PresetEcualizador _leerPresetPrincipal(SharedPreferences prefs) {
     final raw = prefs.getString(_keyPresetPrincipal);
     if (raw == null || raw.isEmpty) {
@@ -285,11 +320,20 @@ class ServicioEcualizador {
       return PresetEcualizador.desdeJson(
         Map<String, dynamic>.from(jsonDecode(raw) as Map),
       );
-    } catch (_) {
+    } catch (e) {
+      registrarSaltoPersistencia(
+        subsistema: 'ecualizador',
+        detalle: _keyPresetPrincipal,
+        razon: e.toString(),
+      );
       return PresetEcualizador.flat;
     }
   }
 
+  /// Reads the per-station preset map with per-entry tolerance
+  /// (persistence-resilience D6) via the same shared helper as [_leerMapa];
+  /// a station whose preset value fails to parse is skipped and logged, its
+  /// siblings survive under their original uuid keys.
   Map<String, PresetEcualizador> _leerPresetsPorEmisora(
     SharedPreferences prefs,
   ) {
@@ -299,13 +343,21 @@ class ServicioEcualizador {
     }
     try {
       final data = Map<String, dynamic>.from(jsonDecode(raw) as Map);
-      return data.map(
-        (uuid, preset) => MapEntry(
-          uuid,
-          PresetEcualizador.desdeJson(Map<String, dynamic>.from(preset as Map)),
+      final resultado = parseMapaTolerante<PresetEcualizador>(
+        data,
+        (valor) => PresetEcualizador.desdeJson(
+          Map<String, dynamic>.from(valor as Map),
         ),
+        subsistema: 'ecualizador',
+        coleccion: _keyPresetsPorEmisora,
+      );
+      return resultado.validas;
+    } catch (e) {
+      registrarSaltoPersistencia(
+        subsistema: 'ecualizador',
+        detalle: _keyPresetsPorEmisora,
+        razon: e.toString(),
       );
-    } catch (_) {
       return {};
     }
   }

test/servicios/servicio_ecualizador_test.dart

@@ -1,8 +1,16 @@
+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:pluriwave/modelos/preset_ecualizador.dart';
 import 'package:pluriwave/servicios/servicio_ecualizador.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+Map<String, dynamic> _presetJson(String nombre) => {
+  'nombre': nombre,
+  'bandas': [1.0, 2.0, 3.0, 4.0, 5.0],
+};
+
 void main() {
   setUp(() {
     SharedPreferences.setMockInitialValues({});
@@ -406,4 +414,160 @@ void main() {
       );
     });
   });
+
+  // ---------------------------------------------------------------------------
+  // persistence-resilience Phase C: per-entry tolerant reads for the 4 EQ
+  // map/single-value readers + degraded-read logging. NO flag/quarantine
+  // here (D6, intentional asymmetry vs. Alarms/Stations) — EQ presets are
+  // explicit-only writes and trivially re-creatable.
+  // ---------------------------------------------------------------------------
+
+  group(
+    'ServicioEcualizador — lectura tolerante y diagnostico (persistence-resilience)',
+    () {
+      late DebugPrintCallback debugPrintOriginal;
+      late List<String> logs;
+
+      setUp(() {
+        debugPrintOriginal = debugPrint;
+        logs = [];
+        debugPrint = (String? message, {int? wrapWidth}) {
+          if (message != null) logs.add(message);
+        };
+      });
+
+      tearDown(() {
+        debugPrint = debugPrintOriginal;
+      });
+
+      test(
+        'C2 presetsMatriz: sobrevive parcial con 2 entradas validas + 1 valor '
+        'corrupto, claves identicas al original',
+        () async {
+          final raw = jsonEncode({
+            'station-1:device-a': _presetJson('Rock'),
+            'station-2:device-b': _presetJson('Pop'),
+            'station-3:device-c': {'nombre': 'Malo', 'bandas': 'no-es-lista'},
+          });
+          SharedPreferences.setMockInitialValues({
+            'eq_presets_matriz_v1': raw,
+          });
+          final prefs = await SharedPreferences.getInstance();
+          final servicio = ServicioEcualizador(prefs: prefs);
+
+          final config = await servicio.cargar();
+
+          expect(config.presetsMatriz.keys.toSet(), {
+            'station-1:device-a',
+            'station-2:device-b',
+          });
+          expect(config.presetsMatriz['station-1:device-a']!.nombre, 'Rock');
+          expect(config.presetsMatriz['station-2:device-b']!.nombre, 'Pop');
+        },
+      );
+
+      test(
+        'C3 presetsMatriz: clave sobreviviente con deviceId estilo MAC '
+        '(varios dos puntos) queda intacta pese a un vecino corrupto',
+        () async {
+          const claveMac = 'station-X:bt_a2dp:AA:BB:CC:DD:EE:FF';
+          final raw = jsonEncode({
+            claveMac: _presetJson('Jazz'),
+            'station-Y:wired_headset': _presetJson('Rock'),
+            'station-Z:corrupt': {'nombre': 'Malo', 'bandas': 'no-es-lista'},
+          });
+          SharedPreferences.setMockInitialValues({
+            'eq_presets_matriz_v1': raw,
+          });
+          final prefs = await SharedPreferences.getInstance();
+          final servicio = ServicioEcualizador(prefs: prefs);
+
+          final config = await servicio.cargar();
+
+          expect(config.presetsMatriz.keys.toSet(), {
+            claveMac,
+            'station-Y:wired_headset',
+          });
+          expect(config.presetsMatriz[claveMac]!.nombre, 'Jazz');
+        },
+      );
+
+      test(
+        'C4 presetsDispositivo totalmente corrupto: cargar() queda vacio, '
+        'guardarPresetDispositivo sigue escribiendo (sin bandera en EQ)',
+        () async {
+          SharedPreferences.setMockInitialValues({
+            'eq_preset_por_dispositivo_v1': '{bad',
+          });
+          final prefs = await SharedPreferences.getInstance();
+          final servicio = ServicioEcualizador(prefs: prefs);
+
+          final config = await servicio.cargar();
+          expect(config.presetsDispositivo, isEmpty);
+
+          const deviceId = 'bt_a2dp:AA:BB:CC:DD:EE:FF';
+          await servicio.guardarPresetDispositivo(
+            deviceId,
+            PresetEcualizador.rock,
+          );
+          final tras = await servicio.cargar();
+
+          expect(
+            tras.presetsDispositivo[deviceId],
+            equals(PresetEcualizador.rock),
+          );
+        },
+      );
+
+      test(
+        'C5 preset principal totalmente corrupto: cargar() retorna flat y '
+        'loguea la lectura degradada',
+        () async {
+          SharedPreferences.setMockInitialValues({
+            'eq_preset_principal_v1': '{bad',
+          });
+          final prefs = await SharedPreferences.getInstance();
+          final servicio = ServicioEcualizador(prefs: prefs);
+
+          final config = await servicio.cargar();
+
+          expect(config.principal, equals(PresetEcualizador.flat));
+          expect(
+            logs.any((l) => l.startsWith('[PluriWave][persistencia]')),
+            isTrue,
+            reason:
+                'una lectura degradada del preset principal debe quedar '
+                'registrada (antes silenciosa)',
+          );
+        },
+      );
+
+      test(
+        'C6 nombresDispositivos: sobrevive parcial con 2 nombres validos + 1 '
+        'valor corrupto',
+        () async {
+          final raw = jsonEncode({
+            'bt_a2dp:AA:BB': 'Living Room BT',
+            'wired_headset': 'Office Headset',
+            'builtin_speaker': 12345, // not a String -> must be skipped
+          });
+          SharedPreferences.setMockInitialValues({
+            'eq_nombres_dispositivos_v1': raw,
+          });
+          final prefs = await SharedPreferences.getInstance();
+          final servicio = ServicioEcualizador(prefs: prefs);
+
+          final config = await servicio.cargar();
+
+          expect(
+            config.nombresDispositivos,
+            equals({
+              'bt_a2dp:AA:BB': 'Living Room BT',
+              'wired_headset': 'Office Headset',
+            }),
+          );
+        },
+      );
+    },
+  );
 }