Handle development firmware labels in update comparisons

lib/src/fota/repository/firmware_image_repository.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 import 'package:http/http.dart' as http;
+import 'package:pub_semver/pub_semver.dart';
 
 import '../model/firmware_update_request.dart';
 
@@ -87,17 +88,29 @@ class FirmwareImageRepository {
     return (latestRelease['tag_name'] as String).replaceFirst('v', '');
   }
 
-  /// Compares semantic version strings and returns `true` when [latest] is
-  /// newer than [current].
+  /// Returns whether [latest] is newer, ignoring build metadata.
+  /// Unrecognized version labels do not trigger an update recommendation.
   bool isNewerVersion(String latest, String current) {
-    List<int> parse(String v) => v.split('.').map(int.parse).toList();
-    final latestParts = parse(latest);
-    final currentParts = parse(current);
+    Version parse(String label) {
+      // Older firmware included the C string terminator in its GATT value.
+      final normalized = label
+          .trim()
+          .replaceFirst(RegExp(r'\x00+$'), '')
+          .trim()
+          .replaceFirst(RegExp(r'^[vV]'), '');
+      final version = Version.parse(normalized);
+      return Version(
+        version.major,
+        version.minor,
+        version.patch,
+        pre: version.preRelease.join('.'),
+      );
+    }
 
-    for (int i = 0; i < latestParts.length; i++) {
-      if (latestParts[i] > currentParts[i]) return true;
-      if (latestParts[i] < currentParts[i]) return false;
+    try {
+      return parse(latest) > parse(current);
+    } on FormatException {
+      return false;
     }
-    return false;
   }
 }

test/firmware_version_comparison_test.dart

@@ -0,0 +1,46 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:open_earable_flutter/src/fota/repository/firmware_image_repository.dart';
+
+void main() {
+  final repository = FirmwareImageRepository();
+
+  test('compares stable release components numerically', () {
+    expect(repository.isNewerVersion('2.2.10', '2.2.9'), isTrue);
+    expect(repository.isNewerVersion('2.3.0', '2.2.10'), isTrue);
+    expect(repository.isNewerVersion('2.2.9', '2.2.9'), isFalse);
+    expect(repository.isNewerVersion('2.2.8', '2.2.9'), isFalse);
+  });
+
+  test('accepts the development label observed on the earable', () {
+    const current = '2.2.9-dev.100+g94986934.dirty';
+    expect(repository.isNewerVersion('2.2.8', current), isFalse);
+    expect(repository.isNewerVersion('2.2.9', current), isTrue);
+    expect(repository.isNewerVersion('2.2.10', current), isTrue);
+  });
+
+  test('orders prereleases numerically and below the stable release', () {
+    expect(repository.isNewerVersion('2.2.9-dev.10', '2.2.9-dev.9'), isTrue);
+    expect(repository.isNewerVersion('2.2.9-pr292', '2.2.9'), isFalse);
+    expect(repository.isNewerVersion('2.2.9', '2.2.9-pr292'), isTrue);
+  });
+
+  test('ignores hashes and other build metadata', () {
+    expect(repository.isNewerVersion('2.2.9+zzz', '2.2.9+aaa'), isFalse);
+    expect(
+      repository.isNewerVersion('2.2.9-dev.1+gabc', '2.2.9-dev.1+gdef.dirty'),
+      isFalse,
+    );
+  });
+
+  test('accepts release tag prefixes and legacy trailing NUL bytes', () {
+    expect(repository.isNewerVersion('v2.2.9', '2.2.8\u0000'), isTrue);
+    expect(repository.isNewerVersion(' V2.2.9 ', '2.2.9\u0000'), isFalse);
+  });
+
+  test('malformed or incomplete versions do not throw or suggest updates', () {
+    for (final label in ['', 'unknown', '2', '2.2.x', 'garbage2.2.9']) {
+      expect(repository.isNewerVersion('2.2.9', label), isFalse);
+      expect(repository.isNewerVersion(label, '2.2.9'), isFalse);
+    }
+  });
+}