import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:tm_app/core/utils/result.dart';
import 'package:tm_app/data/repositories/your_tenders_repository.dart';
import 'package:tm_app/data/services/model/tender_approvals_response/tender_approvals_response.dart';

class YourTendersViewModel with ChangeNotifier {
  final YourTendersRepository yourTendersRepository;
  YourTendersViewModel({required this.yourTendersRepository});

  bool isLoading = false;
  String? errorMessage;
  TenderApprovalsResponse? data;

  // Filter States
  DateTimeRange? selectedDateRange;
  String selectedStatus = 'All';
  final _fmt = DateFormat('yyyy/MM/dd');

  String get startDateFormatted =>
      selectedDateRange?.start != null
          ? _fmt.format(selectedDateRange!.start)
          : 'YYYY/MM/DD';

  String get endDateFormatted =>
      selectedDateRange?.end != null
          ? _fmt.format(selectedDateRange!.end)
          : 'YYYY/MM/DD';

  int get startDateUnix =>
      selectedDateRange?.start != null
          ? selectedDateRange!.start.millisecondsSinceEpoch ~/ 1000
          : 0;

  int get endDateUnix =>
      selectedDateRange?.end != null
          ? selectedDateRange!.end.millisecondsSinceEpoch ~/ 1000
          : 0;

  Future<void> getApprovedTenders() async {
    isLoading = true;
    notifyListeners();

    final result = await yourTendersRepository.getApprovedTenders();

    switch (result) {
      case Ok<TenderApprovalsResponse>():
        data = result.value;
        errorMessage = null;
        break;
      case Error<TenderApprovalsResponse>():
        errorMessage = result.error.toString();
        break;
    }

    isLoading = false;
    notifyListeners();
  }

  Future<void> getTenders({
    required int limit,
    required int offset,
    required String createdFrom,
    required String createdTo,
  }) async {
    isLoading = true;
    notifyListeners();

    final result = await yourTendersRepository.getTenders(
      limit: limit,
      offset: offset,
      createdFrom: createdFrom,
      createdTo: createdTo,
    );
    switch (result) {
      case Ok<TenderApprovalsResponse>():
        data = result.value;
        errorMessage = null;
        break;
      case Error<TenderApprovalsResponse>():
        errorMessage = result.error.toString();
        break;
    }

    isLoading = false;
    notifyListeners();
  }

  // --- Filter Actions ---
  void setDateRange(DateTimeRange? range) {
    selectedDateRange = range;
    notifyListeners();
  }

  void setStatus(String status) {
    selectedStatus = status;
    notifyListeners();
  }

  void clearFilter() {
    selectedDateRange = null;
    selectedStatus = 'All';
    notifyListeners();
  }

  Future<void> callWithFilter() async {
    if (selectedStatus == 'All') {
      await getTenders(
        limit: 10,
        offset: 0,
        createdFrom: startDateUnix.toString(),
        createdTo: endDateUnix.toString(),
      );
    } else if (selectedStatus == 'Tenders submitted') {
      await getApprovedTenders();
    }
  }
}