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lib/shared/models/api_response.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'api_response.freezed.dart';
+part 'api_response.g.dart';
+
+@Freezed(genericArgumentFactories: true)
+class ApiResponse<T> with _$ApiResponse<T> {
+  const factory ApiResponse({
+    required bool success,
+    required T data,
+    String? message,
+    @Default(200) int statusCode,
+  }) = _ApiResponse<T>;
+
+  factory ApiResponse.fromJson(
+    Map<String, dynamic> json,
+    T Function(Object?) fromJsonT,
+  ) =>
+      _$ApiResponseFromJson(json, fromJsonT);
+}

lib/shared/models/pagination.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'pagination.freezed.dart';
+part 'pagination.g.dart';
+
+@Freezed(genericArgumentFactories: true)
+class PaginatedResponse<T> with _$PaginatedResponse<T> {
+  const factory PaginatedResponse({
+    required List<T> items,
+    required int total,
+    required int page,
+    @JsonKey(name: 'page_size') required int pageSize,
+    @JsonKey(name: 'total_pages') required int totalPages,
+    @JsonKey(name: 'has_next') @Default(false) bool hasNext,
+    @JsonKey(name: 'has_prev') @Default(false) bool hasPrev,
+  }) = _PaginatedResponse<T>;
+
+  factory PaginatedResponse.fromJson(
+    Map<String, dynamic> json,
+    T Function(Object?) fromJsonT,
+  ) =>
+      _$PaginatedResponseFromJson(json, fromJsonT);
+}

lib/shared/models/user_role.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+@JsonEnum(valueField: 'value')
+enum UserRole {
+  admin('admin'),
+  user('user');
+
+  const UserRole(this.value);
+
+  final String value;
+
+  static UserRole fromString(String value) {
+    return UserRole.values.firstWhere(
+      (role) => role.value == value,
+      orElse: () => UserRole.user,
+    );
+  }
+}