Przebudowanie aplikacji, usprawnione AI, dodanie combo buildera

lib/data/services/ai_settings_service.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart';
+
+/// Which backend answers chat requests. Embeddings (knowledge base) always
+/// stay on the local Nomic server regardless of this choice.
+enum AiProvider { local, ollama, lmstudio, anthropic, openai, gemini }
+
+extension AiProviderX on AiProvider {
+  String get label => switch (this) {
+    AiProvider.local => 'Built-in (Qwen3 4B)',
+    AiProvider.ollama => 'Ollama (local)',
+    AiProvider.lmstudio => 'LM Studio (local)',
+    AiProvider.anthropic => 'Anthropic (Claude)',
+    AiProvider.openai => 'OpenAI (GPT)',
+    AiProvider.gemini => 'Google (Gemini)',
+  };
+
+  String get defaultModel => switch (this) {
+    AiProvider.local => 'local',
+    AiProvider.ollama => 'qwen3:4b',
+    AiProvider.lmstudio => 'local-model',
+    AiProvider.anthropic => 'claude-opus-4-8',
+    AiProvider.openai => 'gpt-5.1',
+    AiProvider.gemini => 'gemini-2.5-flash',
+  };
+
+  /// Self-hosted OpenAI-compatible servers reachable over a base URL.
+  bool get isSelfHosted =>
+      this == AiProvider.ollama || this == AiProvider.lmstudio;
+
+  String get defaultBaseUrl => switch (this) {
+    AiProvider.ollama => 'http://localhost:11434',
+    AiProvider.lmstudio => 'http://localhost:1234',
+    _ => '',
+  };
+
+  bool get needsApiKey => switch (this) {
+    AiProvider.anthropic || AiProvider.openai || AiProvider.gemini => true,
+    _ => false,
+  };
+}
+
+class AiSettings {
+  const AiSettings({
+    this.provider = AiProvider.local,
+    this.apiKeys = const {},
+    this.models = const {},
+    this.baseUrls = const {},
+  });
+
+  final AiProvider provider;
+
+  /// API key per provider name — kept separately so switching providers
+  /// doesn't lose previously entered keys.
+  final Map<String, String> apiKeys;
+
+  /// Model override per provider name; falls back to [AiProviderX.defaultModel].
+  final Map<String, String> models;
+
+  /// Base URL override per provider name (Ollama / LM Studio);
+  /// falls back to [AiProviderX.defaultBaseUrl].
+  final Map<String, String> baseUrls;
+
+  String? apiKeyFor(AiProvider p) {
+    final key = apiKeys[p.name]?.trim();
+    return (key == null || key.isEmpty) ? null : key;
+  }
+
+  String modelFor(AiProvider p) {
+    final model = models[p.name]?.trim();
+    return (model == null || model.isEmpty) ? p.defaultModel : model;
+  }
+
+  String baseUrlFor(AiProvider p) {
+    final url = baseUrls[p.name]?.trim();
+    final resolved = (url == null || url.isEmpty) ? p.defaultBaseUrl : url;
+    // Tolerate a trailing slash pasted in by the user.
+    return resolved.endsWith('/')
+        ? resolved.substring(0, resolved.length - 1)
+        : resolved;
+  }
+
+  /// True when [provider] can serve chat: self-hosted and built-in servers
+  /// need no key, cloud providers do.
+  bool get isProviderConfigured =>
+      !provider.needsApiKey || apiKeyFor(provider) != null;
+
+  AiSettings copyWith({
+    AiProvider? provider,
+    Map<String, String>? apiKeys,
+    Map<String, String>? models,
+    Map<String, String>? baseUrls,
+  }) {
+    return AiSettings(
+      provider: provider ?? this.provider,
+      apiKeys: apiKeys ?? this.apiKeys,
+      models: models ?? this.models,
+      baseUrls: baseUrls ?? this.baseUrls,
+    );
+  }
+
+  Map<String, dynamic> toJson() => {
+    'provider': provider.name,
+    'apiKeys': apiKeys,
+    'models': models,
+    'baseUrls': baseUrls,
+  };
+
+  factory AiSettings.fromJson(Map<String, dynamic> json) {
+    return AiSettings(
+      provider: AiProvider.values.firstWhere(
+        (p) => p.name == json['provider'],
+        orElse: () => AiProvider.local,
+      ),
+      apiKeys: Map<String, String>.from(json['apiKeys'] as Map? ?? {}),
+      models: Map<String, String>.from(json['models'] as Map? ?? {}),
+      baseUrls: Map<String, String>.from(json['baseUrls'] as Map? ?? {}),
+    );
+  }
+}
+
+/// Loads and persists [AiSettings] as a JSON file in the app documents dir.
+class AiSettingsService extends ChangeNotifier {
+  static const _fileName = 'trainhub_ai_settings.json';
+
+  AiSettings _settings = const AiSettings();
+  AiSettings get settings => _settings;
+
+  Future<File> _file() async {
+    final dir = await getApplicationDocumentsDirectory();
+    return File(p.join(dir.path, _fileName));
+  }
+
+  Future<void> load() async {
+    try {
+      final file = await _file();
+      if (!file.existsSync()) return;
+      final json = jsonDecode(await file.readAsString());
+      _settings = AiSettings.fromJson(json as Map<String, dynamic>);
+      notifyListeners();
+    } catch (e) {
+      if (kDebugMode) debugPrint('Failed to load AI settings: $e');
+    }
+  }
+
+  Future<void> save(AiSettings settings) async {
+    _settings = settings;
+    notifyListeners();
+    try {
+      final file = await _file();
+      await file.writeAsString(jsonEncode(settings.toJson()));
+    } catch (e) {
+      if (kDebugMode) debugPrint('Failed to save AI settings: $e');
+    }
+  }
+}