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

import '../../../core/connections/connection.dart';
import '../../../core/connections/connection_providers.dart';

/// Add/edit dialog for a saved [Connection]. Passing [existing] switches it
/// to edit mode; omitting it creates a new connection and makes it active
/// (the common "just point me at a node" first-run flow).
Future<void> showConnectionFormDialog(
  BuildContext context, {
  Connection? existing,
}) {
  return showDialog<void>(
    context: context,
    builder: (context) => _ConnectionFormDialog(existing: existing),
  );
}

class _ConnectionFormDialog extends ConsumerStatefulWidget {
  const _ConnectionFormDialog({this.existing});

  final Connection? existing;

  @override
  ConsumerState<_ConnectionFormDialog> createState() => _ConnectionFormDialogState();
}

class _ConnectionFormDialogState extends ConsumerState<_ConnectionFormDialog> {
  final _formKey = GlobalKey<FormState>();
  late final _nameController = TextEditingController(text: widget.existing?.name);
  late final _urlController = TextEditingController(text: widget.existing?.baseUrl);
  bool _saving = false;

  @override
  void dispose() {
    _nameController.dispose();
    _urlController.dispose();
    super.dispose();
  }

  String? _validateUrl(String? value) {
    final trimmed = value?.trim() ?? '';
    if (trimmed.isEmpty) return 'Required.';
    final uri = Uri.tryParse(trimmed);
    if (uri == null || !uri.hasScheme || !uri.hasAuthority) {
      return 'Enter a full URL, e.g. https://edge-01.local:8080';
    }
    return null;
  }

  Future<void> _save() async {
    if (!(_formKey.currentState?.validate() ?? false)) return;
    setState(() => _saving = true);

    final name = _nameController.text.trim();
    var url = _urlController.text.trim();
    if (url.endsWith('/')) url = url.substring(0, url.length - 1);

    final existing = widget.existing;
    if (existing != null) {
      await ref
          .read(savedConnectionsProvider.notifier)
          .update(existing.copyWith(name: name, baseUrl: url));
    } else {
      final connection = Connection(
        id: 'conn_${DateTime.now().microsecondsSinceEpoch}',
        name: name,
        baseUrl: url,
      );
      await ref.read(savedConnectionsProvider.notifier).add(connection);
      await ref.read(activeConnectionIdProvider.notifier).setActive(connection.id);
    }

    if (mounted) Navigator.of(context).pop();
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.existing == null ? 'Add connection' : 'Edit connection'),
      content: Form(
        key: _formKey,
        child: SizedBox(
          width: 380,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextFormField(
                controller: _nameController,
                decoration: const InputDecoration(labelText: 'Name'),
                validator: (v) => (v == null || v.trim().isEmpty) ? 'Required.' : null,
                textInputAction: TextInputAction.next,
              ),
              const SizedBox(height: 14),
              TextFormField(
                controller: _urlController,
                decoration: const InputDecoration(
                  labelText: 'Base URL',
                  hintText: 'https://edge-01.local:8080',
                ),
                validator: _validateUrl,
                keyboardType: TextInputType.url,
                onFieldSubmitted: (_) => _save(),
              ),
            ],
          ),
        ),
      ),
      actions: [
        TextButton(
          onPressed: _saving ? null : () => Navigator.of(context).pop(),
          child: const Text('Cancel'),
        ),
        FilledButton(
          onPressed: _saving ? null : _save,
          child: _saving
              ? const SizedBox(
                  width: 16,
                  height: 16,
                  child: CircularProgressIndicator(strokeWidth: 2),
                )
              : const Text('Save'),
        ),
      ],
    );
  }
}