tenders pagination added

lib/data/repositories/tenders_repository.dart

@@ -8,8 +8,11 @@ class TendersRepository {
     : _tendersService = tendersService;
   final TendersService _tendersService;
 
-  Future<Result<TendersResponse>> getTenders() async {
-    return _tendersService.getTenders();
+  Future<Result<TendersResponse>> getTenders({
+    required int limit,
+    required int offset,
+  }) async {
+    return _tendersService.getTenders(limit: limit, offset: offset);
   }
 
   Future<Result<FeedbackResponse>> getTenderFeedback({

lib/data/services/tenders_service.dart

@@ -11,9 +11,12 @@ class TendersService {
     : _networkManager = networkManager;
   final NetworkManager _networkManager;
 
-  Future<Result<TendersResponse>> getTenders() async {
+  Future<Result<TendersResponse>> getTenders({
+    required int limit,
+    required int offset,
+  }) async {
     final result = await _networkManager.makeRequest(
-      '/api/v1/tenders',
+      '/api/v1/tenders?limit=$limit&offset=$offset',
       method: 'GET',
       (json) => TendersResponse.fromJson(json),
     );

lib/view_models/tenders_view_model.dart

@@ -19,11 +19,13 @@ class TendersViewModel with ChangeNotifier {
   }
 
   bool _isLoading = false;
+  bool _isLoadingMore = false;
   String? _errorMessage;
   TendersResponse? _tendersResponse;
   FeedbackData? _feedbackData;
 
   bool get isLoading => _isLoading;
+  bool get isLoadingMore => _isLoadingMore;
   String? get errorMessage => _errorMessage;
   TendersResponse? get tendersResponse => _tendersResponse;
   FeedbackData? get feedbackData => _feedbackData;
@@ -31,6 +33,11 @@ class TendersViewModel with ChangeNotifier {
   List<FeedbackData> feedbacks = [];
 
   int currentPage = 1;
+  int _currentOffset = 0;
+  static const int _pageSize = 10;
+  bool _hasMoreData = true;
+
+  bool get hasMoreData => _hasMoreData;
 
   /// Get feedback for a specific tender
   FeedbackData? getFeedbackForTender(String tenderId) {
@@ -49,13 +56,24 @@ class TendersViewModel with ChangeNotifier {
   Future<void> getTenders() async {
     _isLoading = true;
     _errorMessage = null;
+    _currentOffset = 0;
+    _hasMoreData = true;
     notifyListeners();
 
-    final result = await _tendersRepository.getTenders();
+    final result = await _tendersRepository.getTenders(
+      limit: _pageSize,
+      offset: _currentOffset,
+    );
     switch (result) {
       case Ok<TendersResponse>():
         _tendersResponse = result.value;
-        getTenderFeedback(_tendersResponse!.data!.tenders!.first.id!);
+        // Check if we have more data
+        if (_tendersResponse?.data?.tenders != null) {
+          _hasMoreData = _tendersResponse!.data!.tenders!.length >= _pageSize;
+        }
+        if (_tendersResponse?.data?.tenders?.isNotEmpty == true) {
+          getTenderFeedback(_tendersResponse!.data!.tenders!.first.id!);
+        }
         break;
       case Error<TendersResponse>():
         _errorMessage = result.error.toString();
@@ -67,6 +85,54 @@ class TendersViewModel with ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> loadMoreTenders() async {
+    if (_isLoadingMore || !_hasMoreData) return;
+
+    _isLoadingMore = true;
+    _errorMessage = null;
+    notifyListeners();
+
+    _currentOffset += _pageSize;
+    final result = await _tendersRepository.getTenders(
+      limit: _pageSize,
+      offset: _currentOffset,
+    );
+
+    switch (result) {
+      case Ok<TendersResponse>():
+        if (result.value.data?.tenders != null &&
+            result.value.data!.tenders!.isNotEmpty) {
+          // Create a new modifiable list by combining existing and new tenders
+          if (_tendersResponse?.data?.tenders != null) {
+            final existingTenders = _tendersResponse!.data!.tenders!;
+            final newTenders = result.value.data!.tenders!;
+            final combinedTenders = [...existingTenders, ...newTenders];
+
+            // Create a new TendersData with the combined list
+            _tendersResponse = _tendersResponse!.copyWith(
+              data: _tendersResponse!.data!.copyWith(tenders: combinedTenders),
+            );
+          } else {
+            _tendersResponse = result.value;
+          }
+          // Check if we have more data
+          _hasMoreData = result.value.data!.tenders!.length >= _pageSize;
+        } else {
+          _hasMoreData = false;
+        }
+        break;
+      case Error<TendersResponse>():
+        _errorMessage = result.error.toString();
+        _currentOffset -= _pageSize; // Revert offset on error
+        break;
+    }
+
+    _isLoadingMore = false;
+    notifyListeners();
+    _errorMessage = null;
+    notifyListeners();
+  }
+
   Future<void> getTenderFeedback(String tenderId) async {
     // _isLoading = true;
     _errorMessage = null;

lib/views/tenders/widgets/main_tenders_slider.dart

@@ -94,11 +94,19 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
           setState(() {
             currentPage = index + 1;
           });
+
           // Fetch feedback for the new tender if not already loaded
           final viewModel = context.read<TendersViewModel>();
           if (!viewModel.hasFeedbackForTender(widget.tenders[index].id!)) {
             viewModel.getTenderFeedback(widget.tenders[index].id!);
           }
+
+          // Check if we need to load more tenders (when user reaches near the end)
+          if (index >= widget.tenders.length - 1 &&
+              viewModel.hasMoreData &&
+              !viewModel.isLoadingMore) {
+            viewModel.loadMoreTenders();
+          }
         },
         itemBuilder: (context, index) {
           final tender = widget.tenders[index];
@@ -142,13 +150,31 @@ class _MainTendersSliderState extends State<MainTendersSlider> {
   }
 
   Widget _pageNumberText() {
-    return Text(
-      '$currentPage/${widget.tenders.length}',
-      style: TextStyle(
-        fontSize: 14.0.sp(),
-        fontWeight: FontWeight.w500,
-        color: AppColors.grey,
-      ),
+    final viewModel = context.watch<TendersViewModel>();
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Text(
+          '$currentPage/${widget.tenders.length}',
+          style: TextStyle(
+            fontSize: 14.0.sp(),
+            fontWeight: FontWeight.w500,
+            color: AppColors.grey,
+          ),
+        ),
+        if (viewModel.isLoadingMore)
+          Padding(
+            padding: EdgeInsets.only(top: 4.0.h()),
+            child: SizedBox(
+              width: 16.0.w(),
+              height: 16.0.w(),
+              child: CircularProgressIndicator(
+                strokeWidth: 2.0,
+                color: AppColors.jellyBean,
+              ),
+            ),
+          ),
+      ],
     );
   }