added pagination to group and batch detail screens

lib/screens/groups/controllers/batch_controller.dart

@@ -24,6 +24,7 @@ class BatchScreenModel {
   int currentPage = 0;
   int totalPages = 0;
   int totalElements = 0;
+  int pageSize = 10;
   String searchQuery = '';
   String? statusFilter;
   String? currencyFilter;
@@ -34,6 +35,7 @@ class BatchScreenModel {
   int batchItemsCurrentPage = 0;
   int batchItemsTotalPages = 0;
   int batchItemsTotalElements = 0;
+  int batchItemsPageSize = 10;
   String batchItemsSearchQuery = '';
   String? batchItemsStatusFilter;
   String? batchItemsRecipientAccount;
@@ -167,7 +169,7 @@ class BatchController extends ChangeNotifier {
   Future<ApiResponse<List<GroupBatch>>> listBatches(
     String groupId, {
     int page = 0,
-    int size = 20,
+    int size = 10,
     String? search,
     String? status,
     String? currency,
@@ -248,6 +250,7 @@ class BatchController extends ChangeNotifier {
     await listBatches(
       groupId,
       page: 0,
+      size: model.pageSize,
       search: search,
       status: status,
       currency: currency,
@@ -261,6 +264,43 @@ class BatchController extends ChangeNotifier {
     await listBatches(
       groupId,
       page: model.currentPage + 1,
+      size: model.pageSize,
+      search: model.searchQuery.isNotEmpty ? model.searchQuery : null,
+      status: model.statusFilter,
+      currency: model.currencyFilter,
+    );
+  }
+
+  /// Navigates to a specific page of batches (0-based index).
+  /// Clears the current list and loads the requested page.
+  Future<void> goToPage(String groupId, int page) async {
+    if (model.isLoadingMore) return;
+    if (page < 0 || page >= model.totalPages) return;
+    if (page == model.currentPage) return;
+
+    // Clear existing batches so listBatches replaces instead of appending
+    model.batches = [];
+    model.currentPage = 0;
+    if (!_disposed) notifyListeners();
+
+    await listBatches(
+      groupId,
+      page: page,
+      size: model.pageSize,
+      search: model.searchQuery.isNotEmpty ? model.searchQuery : null,
+      status: model.statusFilter,
+      currency: model.currencyFilter,
+    );
+  }
+
+  /// Changes the page size for batches and reloads from page 0.
+  Future<void> setPageSize(String groupId, int size) async {
+    if (size == model.pageSize) return;
+    model.pageSize = size;
+    if (!_disposed) notifyListeners();
+    // Reload from page 0 with the new size
+    await searchBatches(
+      groupId,
       search: model.searchQuery.isNotEmpty ? model.searchQuery : null,
       status: model.statusFilter,
       currency: model.currencyFilter,
@@ -270,7 +310,7 @@ class BatchController extends ChangeNotifier {
   Future<ApiResponse<List<GroupBatchItem>>> listBatchItems(
     String batchId, {
     int page = 0,
-    int size = 20,
+    int size = 10,
     Map<String, String>? filters,
   }) async {
     if (page == 0) {
@@ -343,6 +383,7 @@ class BatchController extends ChangeNotifier {
     await listBatchItems(
       batchId,
       page: 0,
+      size: model.batchItemsPageSize,
       filters: _buildBatchItemFilters(
         search: search,
         status: status,
@@ -359,6 +400,7 @@ class BatchController extends ChangeNotifier {
     await listBatchItems(
       batchId,
       page: model.batchItemsCurrentPage + 1,
+      size: model.batchItemsPageSize,
       filters: _buildBatchItemFilters(
         search: model.batchItemsSearchQuery.isNotEmpty
             ? model.batchItemsSearchQuery
@@ -369,6 +411,39 @@ class BatchController extends ChangeNotifier {
     );
   }
 
+  /// Navigates to a specific page of batch items (0-based index).
+  /// Clears the current list and loads the requested page.
+  Future<void> goToBatchItemsPage(String batchId, int page) async {
+    if (model.batchItemsIsLoadingMore) return;
+    if (page < 0 || page >= model.batchItemsTotalPages) return;
+    if (page == model.batchItemsCurrentPage) return;
+
+    // Clear existing items so listBatchItems replaces instead of appending
+    model.batchItems = [];
+    model.batchItemsCurrentPage = 0;
+    if (!_disposed) notifyListeners();
+
+    await listBatchItems(
+      batchId,
+      page: page,
+      size: model.batchItemsPageSize,
+      filters: _buildBatchItemFilters(
+        search: model.batchItemsSearchQuery.isNotEmpty
+            ? model.batchItemsSearchQuery
+            : null,
+        status: model.batchItemsStatusFilter,
+        account: model.batchItemsRecipientAccount,
+      ),
+    );
+  }
+
+  /// Changes the page size for batch items and reloads from page 0.
+  void setBatchItemsPageSize(int size) {
+    if (size == model.batchItemsPageSize) return;
+    model.batchItemsPageSize = size;
+    if (!_disposed) notifyListeners();
+  }
+
   /// Builds the filters map for batch items queries from individual params.
   Map<String, String>? _buildBatchItemFilters({
     String? search,

lib/screens/groups/controllers/group_controller.dart

@@ -8,6 +8,7 @@ import 'package:qpay/screens/groups/models/recipient_group_model.dart';
 class GroupScreenModel {
   List<RecipientGroup> groups = [];
   List<RecipientGroupMember> members = [];
+  PageableModel? membersPage;
   bool isLoading = false;
   bool isLoadingMore = false;
   String? errorMessage;
@@ -141,6 +142,7 @@ class GroupController extends ChangeNotifier {
         '/recipient-groups/members?recipientGroupId=$groupId',
       );
       final response = _unwrap(raw);
+      model.membersPage = PageableModel.fromJson(response);
       final List<dynamic> content;
       if (response is List) {
         content = response;