fix: save voice audio to file for cross-session persistence

Matthias Nott

2026-03-22 c9ced26fb059d32d5bd10c37b18ebe97a2f3018a

fix: save voice audio to file for cross-session persistence

 lib/screens/chat_screen.dart
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@@ -1,6 +1,8 @@
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 import 'dart:convert';
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 import 'dart:io';
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+import 'package:path_provider/path_provider.dart';
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+
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 import 'package:flutter/material.dart';
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 import 'package:flutter_riverpod/flutter_riverpod.dart';
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 import 'package:go_router/go_router.dart';
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@@ -302,7 +304,7 @@
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     }
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   }
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-  void _handleIncomingVoice(Map<String, dynamic> msg) {
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+  Future<void> _handleIncomingVoice(Map<String, dynamic> msg) async {
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     final sessionId = msg['sessionId'] as String?;
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     final audioData = msg['audioBase64'] as String? ?? msg['audio'] as String? ?? msg['data'] as String?;
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     final content = msg['content'] as String? ?? msg['text'] as String? ?? '';
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@@ -319,9 +321,33 @@
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       duration: duration,
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     );
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+    // Save audio to file so it survives persistence (base64 gets stripped)
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+    String? savedAudioPath;
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+    if (audioData != null) {
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+      try {
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+        final dir = await getTemporaryDirectory();
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+        savedAudioPath = '${dir.path}/voice_${message.id}.m4a';
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+        final bytes = base64Decode(audioData.contains(',') ? audioData.split(',').last : audioData);
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+        await File(savedAudioPath).writeAsBytes(bytes);
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+      } catch (_) {
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+        savedAudioPath = null;
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+      }
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+    }
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+
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+    final storedMessage = Message(
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+      id: message.id,
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+      role: message.role,
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+      type: message.type,
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+      content: content,
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+      audioUri: savedAudioPath ?? audioData,
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+      timestamp: message.timestamp,
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+      status: message.status,
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+      duration: duration,
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+    );
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+
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     final activeId = ref.read(activeSessionIdProvider);
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     if (sessionId != null && sessionId != activeId) {
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-      _storeForSession(sessionId, message);
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+      _storeForSession(sessionId, storedMessage);
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       _incrementUnread(sessionId);
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       final sessions = ref.read(sessionsProvider);
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       final session = sessions.firstWhere(
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@@ -339,12 +365,11 @@
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       return;
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     }
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-    ref.read(messagesProvider.notifier).addMessage(message);
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+    ref.read(messagesProvider.notifier).addMessage(storedMessage);
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     ref.read(isTypingProvider.notifier).state = false;
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     _scrollToBottom();
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     if (audioData != null && !AudioService.isBackgrounded && !_isCatchingUp && !_isRecording) {
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-      // Queue incoming voice chunks — don't play while recording
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       AudioService.queueBase64(audioData);
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     }
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   }