chore: initial release

lib/core/models/chat_message.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'chat_message.freezed.dart';
+part 'chat_message.g.dart';
+
+@freezed
+sealed class ChatMessage with _$ChatMessage {
+  const factory ChatMessage({
+    required String id,
+    required String role, // 'user', 'assistant', 'system'
+    required String content,
+    required DateTime timestamp,
+    String? model,
+    @Default(false) bool isStreaming,
+    List<String>? attachmentIds,
+    Map<String, dynamic>? metadata,
+    List<Map<String, dynamic>>? sources,
+    Map<String, dynamic>? usage,
+  }) = _ChatMessage;
+
+  factory ChatMessage.fromJson(Map<String, dynamic> json) =>
+      _$ChatMessageFromJson(json);
+}

lib/core/models/conversation.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'chat_message.dart';
+
+part 'conversation.freezed.dart';
+part 'conversation.g.dart';
+
+@freezed
+sealed class Conversation with _$Conversation {
+  const factory Conversation({
+    required String id,
+    required String title,
+    required DateTime createdAt,
+    required DateTime updatedAt,
+    String? model,
+    String? systemPrompt,
+    @Default([]) List<ChatMessage> messages,
+    @Default({}) Map<String, dynamic> metadata,
+    @Default(false) bool pinned,
+    @Default(false) bool archived,
+    String? shareId,
+    String? folderId,
+    @Default([]) List<String> tags,
+  }) = _Conversation;
+
+  factory Conversation.fromJson(Map<String, dynamic> json) =>
+      _$ConversationFromJson(json);
+}

lib/core/models/file_info.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'file_info.freezed.dart';
+part 'file_info.g.dart';
+
+@freezed
+sealed class FileInfo with _$FileInfo {
+  const factory FileInfo({
+    required String id,
+    required String filename,
+    required String originalFilename,
+    required int size,
+    required String mimeType,
+    required DateTime createdAt,
+    required DateTime updatedAt,
+    String? userId,
+    String? hash,
+    Map<String, dynamic>? metadata,
+  }) = _FileInfo;
+
+  factory FileInfo.fromJson(Map<String, dynamic> json) =>
+      _$FileInfoFromJson(json);
+}

lib/core/models/folder.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'folder.freezed.dart';
+part 'folder.g.dart';
+
+// Timestamp converter for Unix timestamps
+class TimestampConverter implements JsonConverter<DateTime, dynamic> {
+  const TimestampConverter();
+
+  @override
+  DateTime fromJson(dynamic json) {
+    if (json is String) {
+      return DateTime.parse(json);
+    } else if (json is int) {
+      return DateTime.fromMillisecondsSinceEpoch(json * 1000);
+    } else {
+      throw ArgumentError('Invalid date format: $json');
+    }
+  }
+
+  @override
+  dynamic toJson(DateTime object) {
+    return object.millisecondsSinceEpoch ~/ 1000;
+  }
+}
+
+@freezed
+sealed class Folder with _$Folder {
+  const factory Folder({
+    required String id,
+    required String name,
+    @TimestampConverter() required DateTime createdAt,
+    @TimestampConverter() required DateTime updatedAt,
+    String? parentId,
+    @Default([]) List<String> conversationIds,
+    @Default([]) List<Folder> subfolders,
+    @Default({}) Map<String, dynamic> metadata,
+  }) = _Folder;
+
+  factory Folder.fromJson(Map<String, dynamic> json) => _$FolderFromJson(json);
+}

lib/core/models/knowledge_base.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'knowledge_base.freezed.dart';
+part 'knowledge_base.g.dart';
+
+@freezed
+sealed class KnowledgeBase with _$KnowledgeBase {
+  const factory KnowledgeBase({
+    required String id,
+    required String name,
+    String? description,
+    required DateTime createdAt,
+    required DateTime updatedAt,
+    @Default(0) int itemCount,
+    @Default({}) Map<String, dynamic> metadata,
+  }) = _KnowledgeBase;
+
+  factory KnowledgeBase.fromJson(Map<String, dynamic> json) =>
+      _$KnowledgeBaseFromJson(json);
+}
+
+@freezed
+sealed class KnowledgeBaseItem with _$KnowledgeBaseItem {
+  const factory KnowledgeBaseItem({
+    required String id,
+    required String content,
+    String? title,
+    required DateTime createdAt,
+    required DateTime updatedAt,
+    @Default({}) Map<String, dynamic> metadata,
+  }) = _KnowledgeBaseItem;
+
+  factory KnowledgeBaseItem.fromJson(Map<String, dynamic> json) =>
+      _$KnowledgeBaseItemFromJson(json);
+}

lib/core/models/model.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'model.freezed.dart';
+
+@freezed
+sealed class Model with _$Model {
+  const Model._();
+
+  const factory Model({
+    required String id,
+    required String name,
+    String? description,
+    @Default(false) bool isMultimodal,
+    @Default(false) bool supportsStreaming,
+    @Default(false) bool supportsRAG,
+    Map<String, dynamic>? capabilities,
+    Map<String, dynamic>? metadata,
+    List<String>? supportedParameters,
+  }) = _Model;
+
+  factory Model.fromJson(Map<String, dynamic> json) {
+    // Handle different response formats from OpenWebUI
+
+    // Extract architecture info for capabilities
+    final architecture = json['architecture'] as Map<String, dynamic>?;
+    final modality = architecture?['modality'] as String?;
+    final inputModalities = architecture?['input_modalities'] as List?;
+
+    // Determine if multimodal based on architecture
+    final isMultimodal =
+        modality?.contains('image') == true ||
+        inputModalities?.contains('image') == true;
+
+    // Extract supported parameters robustly (top-level or nested under provider keys)
+    List? supportedParams =
+        (json['supported_parameters'] as List?) ??
+        (json['supportedParameters'] as List?);
+
+    if (supportedParams == null) {
+      const providerKeys = [
+        'openai',
+        'anthropic',
+        'google',
+        'meta',
+        'mistral',
+        'cohere',
+        'xai',
+        'perplexity',
+        'deepseek',
+        'groq',
+      ];
+      for (final key in providerKeys) {
+        final provider = json[key] as Map<String, dynamic>?;
+        final list =
+            (provider?['supported_parameters'] as List?) ??
+            (provider?['supportedParameters'] as List?);
+        if (list != null) {
+          supportedParams = list;
+          break;
+        }
+      }
+    }
+
+    // Determine streaming support from supported parameters if known
+    final supportsStreaming = supportedParams?.contains('stream') ?? true;
+
+    // Convert supported parameters to List<String> if present
+    final supportedParamsList = supportedParams
+        ?.map((e) => e.toString())
+        .toList();
+
+    return Model(
+      id: json['id'] as String,
+      name: json['name'] as String,
+      description: json['description'] as String?,
+      isMultimodal: isMultimodal,
+      supportsStreaming: supportsStreaming,
+      supportsRAG: json['supportsRAG'] as bool? ?? false,
+      supportedParameters: supportedParamsList,
+      capabilities: {
+        'architecture': architecture,
+        'pricing': json['pricing'],
+        'context_length': json['context_length'],
+        'supported_parameters': supportedParamsList ?? supportedParams,
+      },
+      metadata: {
+        'canonical_slug': json['canonical_slug'],
+        'created': json['created'],
+        'connection_type': json['connection_type'],
+      },
+    );
+  }
+}

lib/core/models/server_config.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'server_config.freezed.dart';
+part 'server_config.g.dart';
+
+@freezed
+sealed class ServerConfig with _$ServerConfig {
+  const factory ServerConfig({
+    required String id,
+    required String name,
+    required String url,
+    String? apiKey,
+    DateTime? lastConnected,
+    @Default(false) bool isActive,
+  }) = _ServerConfig;
+
+  factory ServerConfig.fromJson(Map<String, dynamic> json) =>
+      _$ServerConfigFromJson(json);
+}

lib/core/models/user.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'user.freezed.dart';
+
+@freezed
+sealed class User with _$User {
+  const User._();
+
+  const factory User({
+    required String id,
+    required String username,
+    required String email,
+    String? name,
+    String? profileImage,
+    required String role,
+    @Default(true) bool isActive,
+  }) = _User;
+
+  factory User.fromJson(Map<String, dynamic> json) {
+    // Handle different field names from OpenWebUI API
+    return User(
+      id: json['id'] as String? ?? '',
+      username: json['username'] as String? ?? json['name'] as String? ?? '',
+      email: json['email'] as String? ?? '',
+      name: json['name'] as String?,
+      profileImage:
+          json['profile_image_url'] as String? ??
+          json['profileImage'] as String?,
+      role: json['role'] as String? ?? 'user',
+      isActive: json['is_active'] as bool? ?? json['isActive'] as bool? ?? true,
+    );
+  }
+}

lib/core/models/user_settings.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'user_settings.freezed.dart';
+part 'user_settings.g.dart';
+
+@freezed
+sealed class UserSettings with _$UserSettings {
+  const factory UserSettings({
+    // Chat preferences
+    @Default(true) bool showReadReceipts,
+    @Default(true) bool enableNotifications,
+    @Default(false) bool enableSounds,
+    @Default('auto') String theme, // 'light', 'dark', 'auto'
+    // AI preferences
+    @Default(0.7) double temperature,
+    @Default(2048) int maxTokens,
+    @Default(false) bool streamResponses,
+    @Default(false) bool webSearchEnabled,
+
+    // Privacy settings
+    @Default(true) bool saveConversations,
+    @Default(false) bool shareUsageData,
+
+    // Interface preferences
+    @Default('comfortable')
+    String density, // 'compact', 'comfortable', 'spacious'
+    @Default(14.0) double fontSize,
+    @Default('en') String language,
+
+    // Accessibility settings
+    @Default(false) bool reduceMotion,
+    @Default(true) bool hapticFeedback,
+
+    // Advanced settings
+    @Default({}) Map<String, dynamic> customSettings,
+  }) = _UserSettings;
+
+  factory UserSettings.fromJson(Map<String, dynamic> json) =>
+      _$UserSettingsFromJson(json);
+}