import 'package:coda_project/presentation/screens/notifications_screen.dart';
import 'package:coda_project/presentation/screens/user_settings_screen.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../widgets/finance_summary_card.dart';
import '../widgets/work_day_card.dart';
import '../widgets/settings_bar.dart';
import '../bloc/finance_bloc.dart';
import '../../core/di/injection_container.dart';
import '../../data/datasources/user_local_data_source.dart';
import '../../domain/models/finance_category.dart';

class FinanceScreen extends StatefulWidget {
  final void Function(bool isScrollingDown)? onScrollEvent;

  const FinanceScreen({super.key, this.onScrollEvent});

  @override
  State<FinanceScreen> createState() => _FinanceScreenState();
}

class _FinanceScreenState extends State<FinanceScreen> {
  FinanceCategory currentCategory = FinanceCategory.attendance;
  late ScrollController scrollController;
  late FinanceBloc _financeBloc;
  String? _employeeId;
  DateTime selectedDate = DateTime.now();

  @override
  void initState() {
    super.initState();
    scrollController = ScrollController();
    _financeBloc = sl<FinanceBloc>();
    _loadInitialData();
  }

  @override
  void dispose() {
    scrollController.dispose();
    _financeBloc.close();
    super.dispose();
  }

  void _loadInitialData() async {
    _employeeId = await sl<UserLocalDataSource>().getCachedEmployeeId();
    if (mounted) {
      setState(() {});
      _triggerLoad();
    }
  }

  void _triggerLoad() {
    if (_employeeId != null && _employeeId!.isNotEmpty) {
      if (_financeBloc.state is FinanceInitial) {
        _financeBloc.add(
          LoadFinanceDataEvent(
            employeeId: _employeeId!,
            category: currentCategory,
            month: selectedDate.month,
            year: selectedDate.year,
          ),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return BlocProvider.value(
      value: _financeBloc,
      child: Directionality(
        textDirection: TextDirection.ltr,
        child: SafeArea(
          child: CustomScrollView(
            controller: scrollController,
            physics: const BouncingScrollPhysics(),
            slivers: [
              SliverToBoxAdapter(
                child: SettingsBar(
                  selectedIndex: 0,
                  showBackButton: false,
                  iconPaths: const [
                    'assets/images/user.svg',
                    'assets/images/ball.svg',
                  ],
                  onTap: (index) {
                    if (index == 0) {
                      Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const UserSettingsScreen(),
                        ),
                      );
                    } else if (index == 1) {
                      Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const NotificationsScreen(),
                        ),
                      );
                    }
                  },
                ),
              ),
              const SliverToBoxAdapter(child: SizedBox(height: 5)),

              /// SUMMARY CARD
              SliverToBoxAdapter(
                child: BlocBuilder<FinanceBloc, FinanceState>(
                  buildWhen: (previous, current) => current is FinanceLoaded,
                  builder: (context, state) {
                    String amount = "0";
                    if (state is FinanceLoaded) {
                      amount = state.netSalary.toStringAsFixed(0);
                      amount = amount.replaceAllMapped(
                        RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'),
                        (Match m) => '${m[1]},',
                      );
                    }

                    return FinanceSummaryCard(
                      totalAmount: amount,
                      currentCategory: currentCategory,
                      onCalendarTap: () async {
                        final date = await showDatePicker(
                          context: context,
                          initialDate: selectedDate,
                          firstDate: DateTime(2020),
                          lastDate: DateTime(2030),
                        );
                        if (date != null && mounted) {
                          setState(() => selectedDate = date);
                          if (_employeeId != null && _employeeId!.isNotEmpty) {
                            _financeBloc.add(
                              LoadFinanceDataEvent(
                                employeeId: _employeeId!,
                                category: currentCategory,
                                month: selectedDate.month,
                                year: selectedDate.year,
                              ),
                            );
                          }
                        }
                      },
                      onCategoryChanged: (category) {
                        if (category != null) {
                          setState(() => currentCategory = category);
                          if (_employeeId != null && _employeeId!.isNotEmpty) {
                            _financeBloc.add(
                              LoadFinanceDataEvent(
                                employeeId: _employeeId!,
                                category: currentCategory,
                                month: selectedDate.month,
                                year: selectedDate.year,
                              ),
                            );
                          }
                        }
                      },
                    );
                  },
                ),
              ),

              /// DATA LIST
              BlocBuilder<FinanceBloc, FinanceState>(
                builder: (context, state) {
                  if (state is FinanceLoading || state is FinanceInitial) {
                    return const SliverToBoxAdapter(
                      child: Center(
                        child: Padding(
                          padding: EdgeInsets.all(20.0),
                          child: CircularProgressIndicator(),
                        ),
                      ),
                    );
                  } else if (state is FinanceLoaded) {
                    if (state.records.isEmpty) {
                      return const SliverToBoxAdapter(
                        child: Center(
                          child: Padding(
                            padding: EdgeInsets.all(20.0),
                            child: Text("لا توجد سجلات"),
                          ),
                        ),
                      );
                    }
                    return SliverList(
                      delegate: SliverChildBuilderDelegate((context, index) {
                        return WorkDayCard(record: state.records[index]);
                      }, childCount: state.records.length),
                    );
                  } else if (state is FinanceError) {
                    return SliverToBoxAdapter(
                      child: Center(
                        child: Padding(
                          padding: EdgeInsets.all(20.0),
                          child: Text(
                            state.message,
                            style: const TextStyle(color: Colors.red),
                            textAlign: TextAlign.center,
                          ),
                        ),
                      ),
                    );
                  }
                  return const SliverToBoxAdapter(child: SizedBox());
                },
              ),

              const SliverToBoxAdapter(child: SizedBox(height: 120)),
            ],
          ),
        ),
      ),
    );
  }
}