import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../core/auth/auth_notifier.dart';
import '../../core/status/status_notifier.dart';
import '../../core/chat/chat_request_notifier.dart';
import '../../core/chat/unread_notifier.dart';
import '../chat/widgets/incoming_request_sheet.dart';

class HomeScreen extends ConsumerStatefulWidget {
  const HomeScreen({super.key});

  @override
  ConsumerState<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends ConsumerState<HomeScreen> with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      final chatState = ref.read(chatRequestProvider);
      if (chatState is ChatRequestIncomingData) {
        _showIncomingRequest(chatState.sessionId);
      }
    }
  }

  void _showIncomingRequest(String sessionId) {
    showModalBottomSheet(
      context: context,
      isDismissible: false,
      builder: (_) => IncomingRequestSheet(sessionId: sessionId),
    );
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(mitraAuthProvider);
    final authData = authState.valueOrNull;
    final displayName = authData is MitraAuthAuthenticatedData
        ? authData.profile['display_name'] as String
        : '';

    // Listen for status changes to start/stop chat request listening
    ref.listen(onlineStatusProvider, (prev, next) {
      if (next is StatusLoadedData && next.isOnline) {
        ref.read(chatRequestProvider.notifier).startListening();
      } else if (next is StatusLoadedData && !next.isOnline) {
        ref.read(chatRequestProvider.notifier).stopListening();
      }
    });

    // Listen for incoming chat requests
    ref.listen(chatRequestProvider, (prev, next) {
      if (next is ChatRequestIncomingData) {
        _showIncomingRequest(next.sessionId);
      } else if (next is ChatRequestAcceptedData) {
        final session = next.session;
        final sessionId = session['session_id'] as String? ?? session['id'] as String;
        context.push('/chat/session/$sessionId', extra: {
          'customerName': session['customer_display_name'] as String? ?? 'Customer',
        });
      }
    });

    return Scaffold(
      appBar: AppBar(
        title: const Text('Halo Bestie Mitra'),
        actions: [
          IconButton(
            icon: const Icon(Icons.logout),
            onPressed: () => ref.read(mitraAuthProvider.notifier).logout(),
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          children: [
            Text('Halo, $displayName!', style: const TextStyle(fontSize: 24)),
            const SizedBox(height: 32),
            const _StatusToggle(),
            const SizedBox(height: 16),
            const _ActiveSessionsButton(),
          ],
        ),
      ),
    );
  }
}

class _StatusToggle extends ConsumerWidget {
  const _StatusToggle();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final statusState = ref.watch(onlineStatusProvider);
    final isOnline = statusState is StatusLoadedData && statusState.isOnline;
    final isLoading = statusState is StatusLoadingData;

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  isOnline ? 'Online' : 'Offline',
                  style: TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                    color: isOnline ? Colors.green : Colors.grey,
                  ),
                ),
                Text(
                  isOnline
                      ? 'Kamu siap menerima chat'
                      : 'Aktifkan untuk menerima chat',
                  style: const TextStyle(fontSize: 14, color: Colors.grey),
                ),
              ],
            ),
            isLoading
                ? const SizedBox(
                    width: 24,
                    height: 24,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  )
                : Switch(
                    value: isOnline,
                    activeColor: Colors.green,
                    onChanged: (_) {
                      final notifier = ref.read(onlineStatusProvider.notifier);
                      if (isOnline) {
                        notifier.toggleOffline();
                      } else {
                        notifier.toggleOnline();
                      }
                    },
                  ),
          ],
        ),
      ),
    );
  }
}

class _ActiveSessionsButton extends ConsumerWidget {
  const _ActiveSessionsButton();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final unreadCounts = ref.watch(unreadSessionsProvider);
    final totalUnread = unreadCounts.values.fold(0, (a, b) => a + b);

    return Column(
      children: [
        Card(
          child: ListTile(
            leading: Badge(
              isLabelVisible: totalUnread > 0,
              label: Text('$totalUnread'),
              child: const Icon(Icons.chat_bubble_outline),
            ),
            title: const Text('Sesi Aktif'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => context.push('/sessions'),
          ),
        ),
        Card(
          child: ListTile(
            leading: const Icon(Icons.history),
            title: const Text('Riwayat Chat'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => context.push('/chat/history'),
          ),
        ),
      ],
    );
  }
}