import 'dart:async';

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:mileograph_flutter/objects/objects.dart';
import 'package:mileograph_flutter/services/data_service.dart';
import 'package:provider/provider.dart';

class LegShareNotificationCard extends StatelessWidget {
  const LegShareNotificationCard({super.key, required this.notification});

  final UserNotification notification;

  @override
  Widget build(BuildContext context) {
    final data = context.read<DataService>();
    final legShareId = notification.body.trim();
    if (legShareId.isEmpty) {
      return const Text('Invalid leg share notification.');
    }
    final future = data.fetchLegShare(legShareId);
    return FutureBuilder<LegShareData?>(
      future: future,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Padding(
            padding: EdgeInsets.symmetric(vertical: 6.0),
            child: SizedBox(
              height: 20,
              width: 20,
              child: CircularProgressIndicator(strokeWidth: 2),
            ),
          );
        }
        if (snapshot.hasError) {
          return const Text('Failed to load shared entry.');
        }
        final share = snapshot.data;
        final entry = share?.entry;
        if (share == null || entry == null) {
          return const Text('Shared entry unavailable.');
        }
        final begin = entry.beginTime;
        final beginStr =
            '${begin.year.toString().padLeft(4, '0')}-${begin.month.toString().padLeft(2, '0')}-${begin.day.toString().padLeft(2, '0')} ${begin.hour.toString().padLeft(2, '0')}:${begin.minute.toString().padLeft(2, '0')}';
        final start = entry.route.isNotEmpty ? entry.route.first : entry.start;
        final end = entry.route.isNotEmpty ? entry.route.last : entry.end;
        final sharedAt = share.sharedAt;
        final sharedAtStr = sharedAt == null
            ? null
            : '${sharedAt.year.toString().padLeft(4, '0')}-${sharedAt.month.toString().padLeft(2, '0')}-${sharedAt.day.toString().padLeft(2, '0')} ${sharedAt.hour.toString().padLeft(2, '0')}:${sharedAt.minute.toString().padLeft(2, '0')}';
        final from = share.sharedFromName;

        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('$beginStr • $start → $end'),
            if (from.isNotEmpty)
              Padding(
                padding: const EdgeInsets.only(top: 4.0),
                child: Text(
                  'From $from',
                  style: Theme.of(context).textTheme.bodySmall,
                ),
              ),
            if (sharedAtStr != null)
              Padding(
                padding: const EdgeInsets.only(top: 4.0),
                child: Text(
                  'Shared at $sharedAtStr',
                  style: Theme.of(context).textTheme.bodySmall,
                ),
              ),
            const SizedBox(height: 8),
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: [
                ElevatedButton(
                  onPressed: () => _accept(context, share),
                  child: const Text('Accept'),
                ),
                OutlinedButton(
                  onPressed: () => _inspect(context, share),
                  child: const Text('Inspect'),
                ),
                TextButton(
                  onPressed: () => _reject(context, share),
                  child: const Text('Reject'),
                ),
              ],
            ),
          ],
        );
      },
    );
  }

  Future<void> _accept(BuildContext context, LegShareData share) async {
    final data = context.read<DataService>();
    final messenger = ScaffoldMessenger.maybeOf(context);
    try {
      await data.acceptLegShare(share);
      if (!context.mounted) return;
      await data.dismissNotifications([notification.id]);
      // Refresh legs in the background.
      unawaited(data.refreshLegs());
      messenger?.showSnackBar(
        const SnackBar(content: Text('Shared entry added to logbook')),
      );
    } catch (e) {
      messenger?.showSnackBar(
        SnackBar(content: Text('Failed to add shared entry: $e')),
      );
    }
  }

  Future<void> _reject(BuildContext context, LegShareData share) async {
    final data = context.read<DataService>();
    final messenger = ScaffoldMessenger.maybeOf(context);
    try {
      await data.rejectLegShare(share.id);
      if (!context.mounted) return;
      await data.dismissNotifications([notification.id]);
      messenger?.showSnackBar(
        const SnackBar(content: Text('Share rejected')),
      );
    } catch (e) {
      messenger?.showSnackBar(
        SnackBar(content: Text('Failed to reject share: $e')),
      );
    }
  }

  Future<void> _inspect(BuildContext context, LegShareData share) async {
    final router = GoRouter.of(context);
    // Close notifications panel if open.
    if (Navigator.canPop(context)) {
      Navigator.of(context).pop();
    }
    await Future<void>.delayed(Duration.zero);
    final target = share.copyWith(notificationId: notification.id);
    final ts = DateTime.now().millisecondsSinceEpoch;
    final path = '/add?share=${Uri.encodeComponent(share.id)}&ts=$ts';
    router.go(path, extra: target);
  }
}