chat-server/lib/src/handlers/channel_handlers.dart

import 'package:chat_server/models.dart';
import 'package:chat_server/objectbox.g.dart';
import 'package:relic/relic.dart';

import '../utils/extensions.dart';

/// Get all channels
Future<Response> getChannelsHandler(Request req) async {
  final channels = channelBox.getAll();

  return Response.ok(
    body: {
      'channels': channels
          .map((c) => {
                'id': c.id,
                'name': c.name,
                'description': c.description,
                'createdAt': c.createdAt.toIso8601String(),
              })
          .toList(),
    }.toBody,
  );
}

/// Create a channel (requires 'admin' role)
Future<Response> createChannelHandler(Request req) async {
  final body = await req.asJson();
  final name = (body['name'] as String?)?.trim().toLowerCase().replaceAll(' ', '-');
  final description = body['description'] as String?;

  if (name == null || name.isEmpty) {
    return Response.badRequest(
      body: Body.fromString('Channel name required'),
    );
  }

  // Check if channel exists
  final existing = channelBox.query(Channel_.name.equals(name)).build().findFirst();
  if (existing != null) {
    return Response.badRequest(
      body: Body.fromString('Channel already exists'),
    );
  }

  final channel = Channel(name: name, description: description);
  final id = channelBox.put(channel);

  return Response.ok(
    body: {
      'id': id,
      'name': name,
      'description': description,
      'createdAt': channel.createdAt.toIso8601String(),
    }.toBody,
  );
}

/// Get channel by ID
Future<Response> getChannelHandler(Request req, String channelIdStr) async {
  final channelId = int.tryParse(channelIdStr);
  if (channelId == null) {
    return Response.badRequest(
      body: Body.fromString('Invalid channel ID'),
    );
  }

  final channel = channelBox.get(channelId);
  if (channel == null) {
    return Response.notFound(
      body: Body.fromString('Channel not found'),
    );
  }

  return Response.ok(
    body: {
      'id': channel.id,
      'name': channel.name,
      'description': channel.description,
      'createdAt': channel.createdAt.toIso8601String(),
    }.toBody,
  );
}