import 'package:flutter/material.dart';
import '../../core/service_locator.dart';
import '../../data/nostr/models/nostr_keypair.dart';
import '../../data/nostr/models/nostr_event.dart';
import '../relay_management/relay_management_screen.dart';
import '../relay_management/relay_management_controller.dart';

/// Screen for displaying and testing Nostr events.
class NostrEventsScreen extends StatefulWidget {
  const NostrEventsScreen({super.key});

  @override
  State<NostrEventsScreen> createState() => _NostrEventsScreenState();
}

class _NostrEventsScreenState extends State<NostrEventsScreen> {
  List<String> _events = [];
  bool _isLoading = false;

  Future<void> _publishTestEvent() async {
    if (ServiceLocator.instance.nostrService == null) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('Nostr service not available'),
            backgroundColor: Colors.red,
          ),
        );
      }
      return;
    }

    // Check if user is logged in with Nostr
    final currentUser = ServiceLocator.instance.sessionService?.currentUser;
    if (currentUser == null || currentUser.nostrPrivateKey == null) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('Please log in with Nostr (nsec key) to publish events.'),
            backgroundColor: Colors.orange,
          ),
        );
      }
      return;
    }

    // Get relays
    final relays = ServiceLocator.instance.nostrService!.getRelays();
    if (relays.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('No relays configured. Add relays in Relay Management.'),
            backgroundColor: Colors.orange,
          ),
        );
      }
      return;
    }

    setState(() {
      _isLoading = true;
    });

    try {
      // Reconstruct keypair from stored nsec
      final keyPair = NostrKeyPair.fromNsec(currentUser.nostrPrivateKey!);

      // Create a test event
      final event = NostrEvent.create(
        content: 'Test event from Flutter app - ${DateTime.now().toIso8601String()}',
        kind: 1, // Text note
        privateKey: keyPair.privateKey,
      );

      // Publish to all enabled relays
      final results = await ServiceLocator.instance.nostrService!.publishEventToAllRelays(event);

      setState(() {
        _isLoading = false;
        _events.insert(0, 'Event published: ${event.id.substring(0, 8)}...');
      });

      final successCount = results.values.where((v) => v == true).length;
      final totalCount = results.length;

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Published to $successCount/$totalCount relays'),
            backgroundColor: successCount > 0 ? Colors.green : Colors.orange,
          ),
        );
      }
    } catch (e) {
      setState(() {
        _isLoading = false;
      });

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Failed to publish: ${e.toString()}'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Nostr Events'),
      ),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : SingleChildScrollView(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  _buildActionsSection(),
                  if (_events.isNotEmpty) ...[
                    const SizedBox(height: 24),
                    _buildEventsSection(),
                  ],
                ],
              ),
            ),
    );
  }

  Widget _buildActionsSection() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text(
              'Actions',
              style: TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.bold,
              ),
            ),
            const SizedBox(height: 12),
            ElevatedButton.icon(
              onPressed: _publishTestEvent,
              icon: const Icon(Icons.send),
              label: const Text('Publish Test Event'),
              style: ElevatedButton.styleFrom(
                padding: const EdgeInsets.symmetric(vertical: 16),
              ),
            ),
            const SizedBox(height: 8),
            TextButton.icon(
              onPressed: () {
                if (ServiceLocator.instance.nostrService != null && ServiceLocator.instance.syncEngine != null) {
                  Navigator.of(context).push(
                    MaterialPageRoute(
                      builder: (_) => RelayManagementScreen(
                        controller: RelayManagementController(
                          nostrService: ServiceLocator.instance.nostrService!,
                          syncEngine: ServiceLocator.instance.syncEngine!,
                        ),
                      ),
                    ),
                  );
                } else {
                  ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(
                      content: Text('Nostr service not available'),
                      backgroundColor: Colors.red,
                    ),
                  );
                }
              },
              icon: const Icon(Icons.settings),
              label: const Text('Manage Relays'),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildEventsSection() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              'Recent Events',
              style: TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.bold,
              ),
            ),
            const SizedBox(height: 12),
            ..._events.take(5).map((event) => Padding(
                  padding: const EdgeInsets.only(bottom: 8),
                  child: Text(
                    event,
                    style: const TextStyle(fontSize: 12),
                  ),
                )),
          ],
        ),
      ),
    );
  }
}