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

import '../../core/network/api_exception.dart';
import '../../core/theme/theme_x.dart';
import '../../data/repositories/node_repository.dart';
import 'widgets/connection_form_dialog.dart';
import 'widgets/connections_list.dart';
import 'widgets/no_auth_callout.dart';
import 'widgets/node_identity_form.dart';
import 'widgets/theme_toggle.dart';

class SettingsScreen extends ConsumerWidget {
  const SettingsScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return ListView(
      padding: const EdgeInsets.all(24),
      children: [
        _Block(
          title: 'Connections',
          trailing: TextButton.icon(
            onPressed: () => showConnectionFormDialog(context),
            icon: const Icon(Icons.add, size: 17),
            label: const Text('Add connection'),
          ),
          child: const ConnectionsList(),
        ),
        const SizedBox(height: 22),
        _Block(title: 'Node identity', child: const _NodeIdentitySection()),
        const SizedBox(height: 22),
        _Block(
          title: 'Appearance',
          child: const Padding(
            padding: EdgeInsets.all(16),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text('Theme'),
                ThemeToggle(),
              ],
            ),
          ),
        ),
        const SizedBox(height: 22),
        const NoAuthCallout(),
      ],
    );
  }
}

class _NodeIdentitySection extends ConsumerWidget {
  const _NodeIdentitySection();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final nodeAsync = ref.watch(currentNodeProvider);

    return nodeAsync.when(
      loading: () => const Padding(
        padding: EdgeInsets.all(16),
        child: Row(
          children: [
            SizedBox(width: 14, height: 14, child: CircularProgressIndicator(strokeWidth: 2)),
            SizedBox(width: 10),
            Text('Contacting node…'),
          ],
        ),
      ),
      error: (error, stackTrace) {
        final message = error is ApiException ? error.userMessage : error.toString();
        return Padding(
          padding: const EdgeInsets.all(16),
          child: Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Icon(Icons.error_outline, size: 18, color: context.status.critical),
              const SizedBox(width: 10),
              Expanded(
                child: Text(message, style: context.text.bodyMedium?.copyWith(color: context.status.critical)),
              ),
            ],
          ),
        );
      },
      data: (node) {
        if (node == null) {
          return const Padding(
            padding: EdgeInsets.all(16),
            child: Text('No connection selected.'),
          );
        }
        return NodeIdentityForm(node: node);
      },
    );
  }
}

class _Block extends StatelessWidget {
  const _Block({required this.title, required this.child, this.trailing});

  final String title;
  final Widget child;
  final Widget? trailing;

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(title, style: context.text.titleMedium),
            trailing ?? const SizedBox.shrink(),
          ],
        ),
        const SizedBox(height: 10),
        Card(child: child),
      ],
    );
  }
}