// channel_launch.dart — 联系/购买渠道点击:按 handle(sub)推导 URL 并外部打开。
//   @xxx        → https://t.me/xxx (Telegram)
//   a@b.com     → mailto:a@b.com
//   x.yanmei... → https://x.yanmei...
import 'package:url_launcher/url_launcher.dart';

String channelUrl(String sub) {
  if (sub.startsWith('@')) return 'https://t.me/${sub.substring(1)}';
  if (sub.contains('@')) return 'mailto:$sub';
  return 'https://$sub';
}

/// 点击渠道卡:外部打开对应 URL。失败静默(不炸 UI)。
Future<void> launchChannel(String sub) async {
  final uri = Uri.parse(channelUrl(sub));
  try {
    if (await canLaunchUrl(uri)) {
      await launchUrl(uri, mode: LaunchMode.externalApplication);
    }
  } catch (_) {}
}