tm_app/lib/view_models/home_view_model.dart

import 'package:flutter/material.dart';
import 'package:tm_app/core/utils/result.dart';
import 'package:tm_app/data/services/model/home/home_request/home_request_model.dart';
import 'package:tm_app/data/services/model/recommended_tenders_response/recommended_tenders_response.dart';
import 'package:tm_app/data/services/model/tender_approvals_state_response/tender_approvals_state_response.dart';
import 'package:tm_app/data/services/model/tender_approvals_response/tender_approvals_response.dart';
import 'package:tm_app/data/services/model/tender_data/tender_data.dart';

import '../data/repositories/home_repository.dart';
import '../data/services/model/home/home_response/home_response_model.dart';

class HomeViewModel with ChangeNotifier {
  final HomeRepository _homeRepository;

  HomeViewModel({required HomeRepository homeRepository})
    : _homeRepository = homeRepository {
    getHome(homeRequestModel: HomeRequestModel(id: '1'));
    getYourTenders();
    getApprovedStates();
  }

  bool _isLoading = false;
  String? _errorMessage;
  HomeResponseModel? _homeResponse;
  TenderApprovalsResponse? data;

  bool get isLoading => _isLoading;
  String? get errorMessage => _errorMessage;
  HomeResponseModel? get homeResponse => _homeResponse;

  RecommendedTendersResponse? _recommendedTendersResponse;
  TenderApprovalsStateResponse? tenderApprovalsStateResponse;

  final List<TenderData> _tenders = [];
  final int _pageSize = 20;
  int _currentPage = 0;
  bool _isLoadingMore = false;
  bool _hasMore = true;
  List<TenderData> get tenders => _tenders;
  bool get isLoadingMore => _isLoadingMore;
  bool get hasMore => _hasMore;

  Future<void> getHome({HomeRequestModel? homeRequestModel}) async {
    _isLoading = true;
    _errorMessage = null;
    notifyListeners();

    final result = await _homeRepository.getHome(
      homeRequestModel: homeRequestModel,
    );

    switch (result) {
      case Ok<HomeResponseModel>():
        _homeResponse = result.value;
        break;
      case Error<HomeResponseModel>():
        _errorMessage = result.error.toString();
        break;
    }

    _isLoading = false;
    notifyListeners();
  }

  Future<void> getHomeRecommandTenders({bool reset = false}) async {
    if (_isLoadingMore || (!_hasMore && !reset)) {
      return;
    }

    if (reset) {
      _currentPage = 0;
      _hasMore = true;
      _tenders.clear();
    }

    _isLoadingMore = true;
    _errorMessage = null;
    notifyListeners();

    final result = await _homeRepository.getHomeRecommendedTenders(
      limit: _pageSize,
      offset: _currentPage * _pageSize,
    );

    switch (result) {
      case Ok<RecommendedTendersResponse>():
        _recommendedTendersResponse = result.value;

        if (_recommendedTendersResponse?.data?.tenders.isNotEmpty ?? false) {
          _tenders.addAll(
            _recommendedTendersResponse!.data!.tenders.whereType<TenderData>(),
          );
          _currentPage++;
        } else {
          _hasMore = false;
        }
        break;
      case Error<RecommendedTendersResponse>():
        _errorMessage = result.error.toString();
        break;
    }

    _isLoadingMore = false;
    notifyListeners();
  }

  Future<void> getYourTenders() async {
    _isLoading = true;
    notifyListeners();

    final result = await _homeRepository.getYourTenders();

    switch (result) {
      case Ok<TenderApprovalsResponse>():
        data = result.value;
        _errorMessage = null;

        if (data?.data?.isEmpty ?? true) {
          await getHomeRecommandTenders(reset: true);
        } else {
          _tenders.clear();
          _tenders.addAll(
            data!.data!
                .map((e) => e.tender) 
                .whereType<TenderData>(),
          );
        }

      case Error<TenderApprovalsResponse>():
        _errorMessage = result.error.toString();
        await getHomeRecommandTenders(reset: true);
        break;
    }

    _isLoading = false;
    notifyListeners();
  }
    Future<void> getApprovedStates() async {
    _isLoading = true;
    _errorMessage = null;
    notifyListeners();

    final result = await _homeRepository.getTendersApprovalsState();

    switch (result) {
      case Ok<TenderApprovalsStateResponse>():
        tenderApprovalsStateResponse = result.value;
        break;
      case Error<TenderApprovalsStateResponse>():
        _errorMessage = result.error.toString();
        break;
    }

    _isLoading = false;
    notifyListeners();
  }
}