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/feedback_stats/feedback_stats.dart';
import 'package:tm_app/data/services/model/recommended_tenders_response/recommended_tenders_response.dart';
import 'package:tm_app/data/services/model/tender_approvals_response/tender_approvals_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_data/tender_data.dart';

import '../data/repositories/home_repository.dart';
import '../data/services/model/feedback_stats_response/feedback_stat_response.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 {
    init();
  }

  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;
  FeedbackStats? feedbackStats;
  final List<TenderData> _tenders = [];
  final int _pageSize = 20;
  int _currentPage = 0;
  bool _isLoadingMore = false;
  bool _hasMore = true;

  bool _isRecommendedMode = false;

  List<TenderData> get tenders => _tenders;
  bool get isLoadingMore => _isLoadingMore;
  bool get hasMore => _hasMore;
  bool get isRecommendedMode => _isRecommendedMode;

  void init() async {
    await getApprovedStates();
    await getYourTenders(reset: true);
    await getFeedbackStats();
  }

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

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

    _isLoadingMore = true;
    _errorMessage = null;
    _isRecommendedMode = true;
    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({bool reset = false}) async {
  if (_isLoadingMore || (!_hasMore && !reset)) {
    return;
  }

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

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

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

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

      final tendersList = data?.data?.tenders ?? [];
      final metadata = data?.data?.metadata;

      if (tendersList.isNotEmpty) {
        _tenders.addAll(
          tendersList.map((e) => e.tender).whereType<TenderData>(),
        );
        _currentPage++;

        if (metadata != null && (_currentPage >= metadata.pages!)) {
          _hasMore = false;
        }
      } else {
        _hasMore = false;
      }
      break;

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

  _isLoadingMore = 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();
  }

  Future<void> getFeedbackStats() async {
    _isLoading = true;
    _errorMessage = null;
    notifyListeners();

    final result = await _homeRepository.getFeedbackStats();

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

    _isLoading = false;
    notifyListeners();
  }

  double get partnershipCount {
    return tenderApprovalsStateResponse?.data?.partnershipCount?.toDouble() ??
        0.0;
  }

  double get selfApplyCount {
    return tenderApprovalsStateResponse?.data?.selfApplyCount?.toDouble() ??
        0.0;
  }

  double get totalCount {
    return partnershipCount + selfApplyCount;
  }

  double get partnershipPercent {
    return totalCount > 0 ? (partnershipCount / totalCount) * 100 : 0;
  }

  double get selfApplyPercent {
    return totalCount > 0 ? (selfApplyCount / totalCount) * 100 : 0;
  }
}