realtimeDB

realtimeDB.dart

import 'package:flutter/material.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/services.dart';
import 'package:link_preview_generator/link_preview_generator.dart';
// {
//   "groups": {
//     "group1": {
//       "links": {
//         "link1": {
//           "title": "Link 1 Title",
//           "url": "https://example.com/link1"
//         },
//         "link2": {
//           "title": "Link 2 Title",
//           "url": "https://example.com/link2"
//         }
//       }
//     },
//     "group2": {
//       "links": {
//         "link3": {
//           "title": "Link 3 Title",
//           "url": "https://example.com/link3"
//         }
//       }
//     }
//   }
// }

class RealtimeDbExample extends StatefulWidget {
  const RealtimeDbExample({super.key});

  @override
  RealtimeDbExampleState createState() => RealtimeDbExampleState();
}

class RealtimeDbExampleState extends State<RealtimeDbExample> {
  final DatabaseReference _databaseReference =
      FirebaseDatabase.instance.reference();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Group Links'),
      ),
      body: FutureBuilder<DatabaseEvent>(
        future: _databaseReference.child('groups').once(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          } else if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          } else if (!snapshot.hasData ||
              snapshot.data?.snapshot.value == null) {
            return const Center(child: Text('No data'));
          } else {
            final data = snapshot.data?.snapshot.value as Map<dynamic, dynamic>;
            final groupNames = data.keys.toList();

            return ListView.builder(
              itemCount: groupNames.length,
              itemBuilder: (context, index) {
                final groupName = groupNames[index];
                final groupData = data[groupName] as Map<dynamic, dynamic>;
                final links = groupData['links'] as Map<dynamic, dynamic>;

                return ListTile(
                  title: Text(groupName),
                  subtitle: Text('Links: ${links.length}'),
                  onTap: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) => GroupLinksScreen(
                          groupName: groupName, links: links,
                          databaseReference: _databaseReference, // Pass it here
                        ),
                      ),
                    );
                  },
                );
              },
            );
          }
        },
      ),
    );
  }
}

class GroupLinksScreen extends StatelessWidget {
  final String groupName;
  final Map<dynamic, dynamic> links;
  final DatabaseReference databaseReference; // Add this line

  const GroupLinksScreen(
      {required this.groupName,
      required this.links,
      required this.databaseReference,
      Key? key})
      : super(key: key);
  void addNewLink(String id, String url) {
    databaseReference
        .child('groups')
        .child(groupName)
        .child('links')
        .push()
        .set({
      'id': id,
      'url': url,
    });
  }

  void _showAddLinkDialog(BuildContext context) {
    String newId = '';
    String newUrl = '';

    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          title: const Text('Add New Link'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                onChanged: (value) {
                  newId = value;
                },
                decoration: const InputDecoration(
                  hintText: 'Enter ID',
                ),
              ),
              TextField(
                onChanged: (value) {
                  newUrl = value;
                },
                decoration: const InputDecoration(
                  hintText: 'Enter URL',
                ),
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              child: const Text('Cancel'),
            ),
            ElevatedButton(
              onPressed: () {
                // Call the function to add the new link
                addNewLink(newId, newUrl);
                Navigator.of(context).pop();
              },
              child: const Text('Add'),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(groupName),
      ),
      body: ListView.builder(
        itemCount: links.length,
        itemBuilder: (context, index) {
          final linkKey = links.keys.toList()[index];
          final linkData = links[linkKey] as Map<dynamic, dynamic>;
          final uniqueNumber = linkData['id'] as String;
          final url = linkData['url'] as String;

          return ListTile(
            title: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text('ID: $uniqueNumber'),
                LinkPreviewGenerator(
                  bodyMaxLines: 3,
                  link: url,
                  placeholderWidget:
                      const Center(child: CircularProgressIndicator()),
                  linkPreviewStyle: LinkPreviewStyle.small,
                  showBody: false,
                  showGraphic: true,
                  showDomain: false,
                ),
              ],
            ),
            trailing: IconButton(
              icon: const Icon(Icons.copy),
              onPressed: () {
                _copyToClipboard(context, url);
              },
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _showAddLinkDialog(context);
        },
      ),
    );
  }

  void _copyToClipboard(BuildContext context, String text) {
    Clipboard.setData(ClipboardData(text: text));
    const snackBar = SnackBar(content: Text('Link copied to clipboard'));
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }
}