import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:syncrow_web/pages/access_management/bloc/access_event.dart';
import 'package:syncrow_web/pages/access_management/bloc/access_state.dart';
import 'package:syncrow_web/pages/access_management/model/password_model.dart';
import 'package:syncrow_web/services/access_mang_api.dart';
import 'package:syncrow_web/utils/color_manager.dart';
import 'package:syncrow_web/utils/constants/app_enum.dart';
import 'package:syncrow_web/utils/snack_bar.dart';

class AccessBloc extends Bloc<AccessEvent, AccessState> {
  AccessBloc() : super((AccessInitial())) {
    on<FetchTableData>(_onFetchTableData);
    // on<TabChangedEvent>(selectFilterTap);
    on<SelectTime>(selectTime);
    on<FilterDataEvent>(_filterData);
    on<ResetSearch>(resetSearch);
    on<TabChangedEvent>(onTabChanged);
  }
  String startTime = 'Start Date';
  String endTime = 'End Date';

  int? effectiveTimeTimeStamp;
  int? expirationTimeTimeStamp;
  TextEditingController passwordName = TextEditingController();
  List<PasswordModel> filteredData = [];
  List<PasswordModel> data = [];

  Future<void> _onFetchTableData(FetchTableData event, Emitter<AccessState> emit) async {
    try {
      emit(AccessLoaded());
      data = await AccessMangApi().fetchVisitorPassword();
      filteredData = data;
      updateTabsCount();
      emit(TableLoaded(data));
    } catch (e) {
      emit(FailedState(e.toString()));
    }
  }

  void updateTabsCount() {
    int toBeEffectiveCount =
        data.where((item) => item.passwordStatus.value == 'To be effective').length;
    int effectiveCount = data.where((item) => item.passwordStatus.value == 'Effective').length;
    int expiredCount = data.where((item) => item.passwordStatus.value == 'Expired').length;
    tabs[1] = 'To Be Effective ($toBeEffectiveCount)';
    tabs[2] = 'Effective ($effectiveCount)';
    tabs[3] = 'Expired ($expiredCount)';
  }

  int selectedIndex = 0;
  final List<String> tabs = ['All', 'To Be Effective (0)', 'Effective (0)', 'Expired'];

  Future selectFilterTap(TabChangedEvent event, Emitter<AccessState> emit) async {
    try {
      emit(AccessLoaded());
      selectedIndex = event.selectedIndex;
      emit(AccessInitial());
      emit(TableLoaded(data));
    } catch (e) {
      emit(FailedState(e.toString()));
      return;
    }
  }

  Future<void> selectTime(SelectTime event, Emitter<AccessState> emit) async {
    emit(AccessLoaded());
    final DateTime? picked = await showDatePicker(
      context: event.context,
      initialDate: DateTime.now(),
      firstDate: DateTime(2015, 8),
      lastDate: DateTime(2101),
    );
    if (picked != null) {
      final selectedDateTime = DateTime(
        picked.year,
        picked.month,
        picked.day,
      );
      final selectedTimestamp = DateTime(
            selectedDateTime.year,
            selectedDateTime.month,
            selectedDateTime.day,
            selectedDateTime.hour,
            selectedDateTime.minute,
          ).millisecondsSinceEpoch ~/
          1000; // Divide by 1000 to remove milliseconds
      if (event.isStart) {
        if (expirationTimeTimeStamp != null && selectedTimestamp > expirationTimeTimeStamp!) {
          CustomSnackBar.displaySnackBar('Effective Time cannot be later than Expiration Time.');
        } else {
          startTime =
              selectedDateTime.toString().split('.').first; // Remove seconds and milliseconds
          effectiveTimeTimeStamp = selectedTimestamp;
        }
      } else {
        if (effectiveTimeTimeStamp != null && selectedTimestamp < effectiveTimeTimeStamp!) {
          CustomSnackBar.displaySnackBar('Expiration Time cannot be earlier than Effective Time.');
        } else {
          endTime = selectedDateTime.toString().split('.').first; // Remove seconds and milliseconds
          expirationTimeTimeStamp = selectedTimestamp;
        }
      }
    }
    emit(ChangeTimeState());
  }

  Future<void> _filterData(FilterDataEvent event, Emitter<AccessState> emit) async {
    emit(AccessLoaded());
    try {
      filteredData = data.where((item) {
        bool matchesCriteria = true;

        // Convert timestamp to DateTime and extract date component
        DateTime effectiveDate =
            DateTime.fromMillisecondsSinceEpoch(int.parse(item.effectiveTime.toString()) * 1000)
                .toUtc()
                .toLocal();
        DateTime invalidDate =
            DateTime.fromMillisecondsSinceEpoch(int.parse(item.invalidTime.toString()) * 1000)
                .toUtc()
                .toLocal();
        DateTime effectiveDateOnly =
            DateTime(effectiveDate.year, effectiveDate.month, effectiveDate.day);
        DateTime invalidDateOnly = DateTime(invalidDate.year, invalidDate.month, invalidDate.day);

        // Filter by password name
        if (event.passwordName != null && event.passwordName!.isNotEmpty) {
          final bool matchesName =
              item.passwordName != null && item.passwordName.contains(event.passwordName);
          if (!matchesName) {
            matchesCriteria = false;
          }
        }

        // Filter by start date only
        if (event.startTime != null && event.endTime == null) {
          DateTime startDateOnly =
              DateTime.fromMillisecondsSinceEpoch(event.startTime! * 1000).toUtc().toLocal();
          startDateOnly = DateTime(startDateOnly.year, startDateOnly.month, startDateOnly.day);
          if (effectiveDateOnly.isBefore(startDateOnly)) {
            matchesCriteria = false;
          }
        }

        // Filter by end date only
        if (event.endTime != null && event.startTime == null) {
          DateTime endDateOnly =
              DateTime.fromMillisecondsSinceEpoch(event.endTime! * 1000).toUtc().toLocal();
          endDateOnly = DateTime(endDateOnly.year, endDateOnly.month, endDateOnly.day);
          if (invalidDateOnly.isAfter(endDateOnly)) {
            matchesCriteria = false;
          }
        }

        // Filter by both start date and end date
        if (event.startTime != null && event.endTime != null) {
          DateTime startDateOnly =
              DateTime.fromMillisecondsSinceEpoch(event.startTime! * 1000).toUtc().toLocal();
          DateTime endDateOnly =
              DateTime.fromMillisecondsSinceEpoch(event.endTime! * 1000).toUtc().toLocal();
          startDateOnly = DateTime(startDateOnly.year, startDateOnly.month, startDateOnly.day);
          endDateOnly = DateTime(endDateOnly.year, endDateOnly.month, endDateOnly.day);
          if (effectiveDateOnly.isBefore(startDateOnly) || invalidDateOnly.isAfter(endDateOnly)) {
            matchesCriteria = false;
          }
        }

        // Filter by selected tab index
        if (event.selectedTabIndex == 1 && item.passwordStatus.value != 'To be effective') {
          matchesCriteria = false;
        } else if (event.selectedTabIndex == 2 && item.passwordStatus.value != 'Effective') {
          matchesCriteria = false;
        } else if (event.selectedTabIndex == 3 && item.passwordStatus.value != 'Expired') {
          matchesCriteria = false;
        }

        return matchesCriteria;
      }).toList();

      emit(TableLoaded(filteredData));
    } catch (e) {
      emit(FailedState(e.toString()));
    }
  }

  resetSearch(ResetSearch event, Emitter<AccessState> emit) async {
    emit(AccessLoaded());
    startTime = 'Start Time';
    endTime = 'End Time';
    passwordName.clear();
    selectedIndex = 0;
    effectiveTimeTimeStamp = null;
    expirationTimeTimeStamp = null;
    add(FetchTableData());
  }

  String timestampToDate(dynamic timestamp) {
    DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(int.parse(timestamp) * 1000);
    return "${dateTime.year}/${dateTime.month.toString().padLeft(2, '0')}/${dateTime.day.toString().padLeft(2, '0')}";
  }

  Future<void> onTabChanged(TabChangedEvent event, Emitter<AccessState> emit) async {
    try {
      emit(AccessLoaded());
      selectedIndex = event.selectedIndex;
      switch (selectedIndex) {
        case 0: // All
          filteredData = data;
          break;
        case 1: // To Be Effective
          filteredData =
              data.where((item) => item.passwordStatus.value == "To Be Effective").toList();
          break;
        case 2: // Effective
          filteredData = data.where((item) => item.passwordStatus.value == "Effective").toList();
          break;
        case 3: // Expired
          filteredData = data.where((item) => item.passwordStatus.value == "Expired").toList();
          break;
        default:
          filteredData = data;
      }
      add(FilterDataEvent(
          selectedTabIndex: selectedIndex,
          passwordName: passwordName.text.toLowerCase(),
          startTime: effectiveTimeTimeStamp,
          endTime: expirationTimeTimeStamp));
      emit(TableLoaded(filteredData));
    } catch (e) {
      emit(FailedState(e.toString()));
    }
  }
}