import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import 'package:household_keeper/core/database/database.dart';
import 'package:household_keeper/core/providers/database_provider.dart';
import 'package:household_keeper/features/home/presentation/calendar_day_list.dart';
import 'package:household_keeper/features/home/presentation/calendar_providers.dart';
import 'package:household_keeper/features/home/presentation/calendar_strip.dart';
import 'package:household_keeper/features/tasks/presentation/sort_dropdown.dart';
import 'package:household_keeper/l10n/app_localizations.dart';

/// Screen displaying tasks within a room filtered by the selected calendar day.
///
/// Shows a horizontal calendar strip at the top (same as HomeScreen) and
/// a date-filtered task list below. FAB always visible for quick task creation.
/// AppBar shows room name with edit and delete actions.
class TaskListScreen extends ConsumerStatefulWidget {
  const TaskListScreen({super.key, required this.roomId});

  final int roomId;

  @override
  ConsumerState<TaskListScreen> createState() => _TaskListScreenState();
}

class _TaskListScreenState extends ConsumerState<TaskListScreen> {
  late final CalendarStripController _stripController =
      CalendarStripController();

  /// Whether to show the floating "Heute" button.
  /// True when the user has scrolled away from today's card.
  bool _showTodayButton = false;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);

    return Scaffold(
      appBar: AppBar(
        title: _RoomTitle(roomId: widget.roomId),
        actions: [
          const SortDropdown(),
          IconButton(
            icon: const Icon(Icons.edit),
            onPressed: () => context.go('/rooms/${widget.roomId}/edit'),
          ),
          IconButton(
            icon: const Icon(Icons.delete),
            onPressed: () => _showRoomDeleteConfirmation(context, ref, l10n),
          ),
        ],
      ),
      body: Stack(
        children: [
          Column(
            children: [
              CalendarStrip(
                controller: _stripController,
                onTodayVisibilityChanged: (visible) {
                  setState(() => _showTodayButton = !visible);
                },
              ),
              Expanded(child: CalendarDayList(roomId: widget.roomId)),
            ],
          ),
          if (_showTodayButton)
            Positioned(
              bottom: 80, // Above the FAB
              left: 0,
              right: 0,
              child: Center(
                child: FloatingActionButton.extended(
                  onPressed: () {
                    final now = DateTime.now();
                    final today = DateTime(now.year, now.month, now.day);
                    ref
                        .read(selectedDateProvider.notifier)
                        .selectDate(today);
                    _stripController.scrollToToday();
                  },
                  icon: const Icon(Icons.today),
                  label: Text(l10n.calendarTodayButton),
                ),
              ),
            ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => context.go('/rooms/${widget.roomId}/tasks/new'),
        child: const Icon(Icons.add),
      ),
    );
  }

  void _showRoomDeleteConfirmation(
    BuildContext context,
    WidgetRef ref,
    AppLocalizations l10n,
  ) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text(l10n.roomDeleteConfirmTitle),
        content: Text(l10n.roomDeleteConfirmMessage),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: Text(l10n.cancel),
          ),
          FilledButton(
            onPressed: () {
              Navigator.pop(ctx);
              final db = ref.read(appDatabaseProvider);
              db.roomsDao.deleteRoom(widget.roomId);
              // Navigate back to rooms list
              context.go('/rooms');
            },
            style: FilledButton.styleFrom(
              backgroundColor: Theme.of(context).colorScheme.error,
              foregroundColor: Theme.of(context).colorScheme.onError,
            ),
            child: Text(l10n.roomDeleteConfirmAction),
          ),
        ],
      ),
    );
  }
}

/// Async room name loader for the AppBar title.
class _RoomTitle extends ConsumerWidget {
  const _RoomTitle({required this.roomId});

  final int roomId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    // Use a FutureBuilder-like approach: read room name from DB
    return FutureBuilder<Room>(
      future: ref.read(appDatabaseProvider).roomsDao.getRoomById(roomId),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return Text(snapshot.data!.name);
        }
        return const Text('...');
      },
    );
  }
}