add auth, format

lib/features/auth/data/models/auth_session_model.dart

@@ -0,0 +1,86 @@
+/// Authentication Session Model
+///
+/// Models for API authentication response structure.
+/// Matches the ERPNext login API response format.
+library;
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'auth_session_model.freezed.dart';
+part 'auth_session_model.g.dart';
+
+/// App Information
+///
+/// Represents an available app in the system.
+@freezed
+sealed class AppInfo with _$AppInfo {
+  const factory AppInfo({
+    @JsonKey(name: 'app_title') required String appTitle,
+    @JsonKey(name: 'app_endpoint') required String appEndpoint,
+    @JsonKey(name: 'app_logo') required String appLogo,
+  }) = _AppInfo;
+
+  factory AppInfo.fromJson(Map<String, dynamic> json) =>
+      _$AppInfoFromJson(json);
+}
+
+/// Login Response Message
+///
+/// Contains the core authentication data from login response.
+@freezed
+sealed class LoginMessage with _$LoginMessage {
+  const factory LoginMessage({
+    required bool success,
+    required String message,
+    required String sid,
+    @JsonKey(name: 'csrf_token') required String csrfToken,
+    @Default([]) List<AppInfo> apps,
+  }) = _LoginMessage;
+
+  factory LoginMessage.fromJson(Map<String, dynamic> json) =>
+      _$LoginMessageFromJson(json);
+}
+
+/// Authentication Session Response
+///
+/// Complete authentication response from ERPNext login API.
+@freezed
+sealed class AuthSessionResponse with _$AuthSessionResponse {
+  const factory AuthSessionResponse({
+    @JsonKey(name: 'session_expired') required int sessionExpired,
+    required LoginMessage message,
+    @JsonKey(name: 'home_page') required String homePage,
+    @JsonKey(name: 'full_name') required String fullName,
+  }) = _AuthSessionResponse;
+
+  factory AuthSessionResponse.fromJson(Map<String, dynamic> json) =>
+      _$AuthSessionResponseFromJson(json);
+}
+
+/// Session Storage Model
+///
+/// Simplified model for storing session data in Hive.
+@freezed
+sealed class SessionData with _$SessionData {
+  const factory SessionData({
+    required String sid,
+    required String csrfToken,
+    required String fullName,
+    required DateTime createdAt,
+    List<AppInfo>? apps,
+  }) = _SessionData;
+
+  factory SessionData.fromJson(Map<String, dynamic> json) =>
+      _$SessionDataFromJson(json);
+
+  /// Create from API response
+  factory SessionData.fromAuthResponse(AuthSessionResponse response) {
+    return SessionData(
+      sid: response.message.sid,
+      csrfToken: response.message.csrfToken,
+      fullName: response.fullName,
+      createdAt: DateTime.now(),
+      apps: response.message.apps,
+    );
+  }
+}