import 'package:equatable/equatable.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flux/core/blocs/session/session_cubit.dart';
import 'package:flux/features/master_data/staff/models/staff_member_model.dart';
import 'package:flux/features/settings/data/settings_repository.dart';
import 'package:flux/features/tasks/data/task_repository.dart';
import 'package:flux/features/tasks/models/task_model.dart';
import 'package:flux/features/tasks/models/task_reminder_config.dart';
import 'package:flux/features/tasks/models/task_status.dart';
import 'package:get_it/get_it.dart';
part 'task_form_state.dart';

class TaskFormCubit extends Cubit<TaskFormState> {
  final TaskRepository _repository = GetIt.I.get<TaskRepository>();
  final SettingsRepository _settingsRepository = GetIt.I
      .get<SettingsRepository>();
  final SessionCubit _sessionCubit = GetIt.I.get<SessionCubit>();

  TaskFormCubit({TaskModel? existingTask})
    : super(
        TaskFormState(
          id: existingTask?.id,
          title: existingTask?.title ?? '',
          description: existingTask?.description ?? '',
          dueDate: existingTask?.dueDate,
          isGlobal: existingTask?.isGlobal ?? false,
          selectedStaffIds: existingTask?.assignedToIds ?? [],
        ),
      ) {
    if (existingTask == null) {
      _initializeNewTaskReminders();
    } else {
      _loadExistingTaskReminders(existingTask.id!);
    }
  }

  String get _companyId => _sessionCubit.state.company!.id!;
  String get _currentUserId => _sessionCubit.state.currentStaffMember!.id!;

  // --- INIT REMINDER NUOVO TASK ---
  Future<void> _initializeNewTaskReminders() async {
    try {
      final defaults = await _settingsRepository.getMyReminderDefaults(
        companyId: _companyId,
        staffId: _currentUserId,
      );

      final initialReminders = defaults
          .map(
            (d) => TaskReminderConfig(
              minutesBefore: d.minutesBefore,
              channel: d.channel,
            ),
          )
          .toList();

      emit(state.copyWith(reminders: initialReminders));
    } catch (e) {
      // Fallback in caso di errore
      emit(
        state.copyWith(
          reminders: const [
            TaskReminderConfig(minutesBefore: 15, channel: 'push'),
          ],
        ),
      );
    }
  }

  // --- INIT REMINDER TASK ESISTENTE ---
  Future<void> _loadExistingTaskReminders(String taskId) async {
    try {
      // Recuperiamo SOLO i reminder non forzati dell'utente loggato per popolare il form
      final existingConfigs = await _repository.fetchPersonalReminders(
        taskId: taskId,
        staffId: _currentUserId,
      );
      emit(state.copyWith(reminders: existingConfigs));
    } catch (e) {
      print('Errore caricamento reminder: $e');
    }
  }

  // --- UPDATE CAMPI BASE ---
  void updateTitle(String t) => emit(state.copyWith(title: t));
  void updateDescription(String d) => emit(state.copyWith(description: d));
  void updateDueDate(DateTime? d) => emit(state.copyWith(dueDate: d));
  void toggleGlobalScope(bool g) => emit(state.copyWith(isGlobal: g));

  void toggleStaffSelection(String staffId) {
    final updated = List<String>.from(state.selectedStaffIds);
    updated.contains(staffId) ? updated.remove(staffId) : updated.add(staffId);
    emit(state.copyWith(selectedStaffIds: updated));
  }

  // --- GESTIONE REMINDER NEL FORM ---
  void addReminderRule(int minutesBefore, String channel) {
    final updated = List<TaskReminderConfig>.from(state.reminders);
    final newConfig = TaskReminderConfig(
      minutesBefore: minutesBefore,
      channel: channel,
    );

    if (!updated.contains(newConfig)) {
      updated.add(newConfig);
      updated.sort((a, b) => a.minutesBefore.compareTo(b.minutesBefore));
      emit(state.copyWith(reminders: updated));
    }
  }

  void removeReminderRule(int index) {
    final updated = List<TaskReminderConfig>.from(state.reminders)
      ..removeAt(index);
    emit(state.copyWith(reminders: updated));
  }

  // --- SALVATAGGIO FINALE ---
  Future<void> saveTask() async {
    if (!state.isFormValid) return;
    emit(state.copyWith(status: TaskFormStatus.submitting));

    final taskToSave = TaskModel(
      id: state.id,
      companyId: _companyId,
      createdBy: _currentUserId,
      title: state.title.trim(),
      description: state.description.trim(),
      dueDate: state.dueDate,
      isGlobal: state.isGlobal,
      assignedToIds: state.selectedStaffIds,
    );

    try {
      if (state.id == null) {
        // NUOVO TASK -> CREATE
        // Qui potresti passare un managerForcedOverride se implementi la UI per quello
        await _repository.createTask(
          task: taskToSave,
          assignedStaffIds: state.selectedStaffIds,
          currentUserId: _currentUserId,
          currentUserCustomReminders: state.reminders,
        );
      } else {
        // VECCHIO TASK -> UPDATE
        await _repository.updateTask(
          task: taskToSave,
          assignedStaffIds: state.selectedStaffIds,
          currentUserId: _currentUserId,
          currentUserCustomReminders: state.reminders,
        );
      }
      emit(state.copyWith(status: TaskFormStatus.success));
    } catch (e) {
      emit(
        state.copyWith(
          status: TaskFormStatus.failure,
          errorMessage: e.toString(),
        ),
      );
    }
  }
}