import 'dart:developer';

import 'package:flutter_linkify/flutter_linkify.dart';
import 'package:url_launcher/url_launcher.dart';

/// Single entry point for opening links that come from outside the app (chat
/// messages, ticker content, emergency notices).
class UrlOpener {
  /// Schemes we hand to the platform. Message content is user supplied, so
  /// anything that could address another app directly stays out.
  static const _allowedSchemes = {'http', 'https', 'mailto', 'tel'};

  static Future<void> onOpen(LinkableElement link) => openUrl(link.url);

  static Future<void> openUrl(String url) async {
    final uri = Uri.tryParse(url);
    if (uri == null || !_allowedSchemes.contains(uri.scheme.toLowerCase())) {
      return;
    }

    // externalApplication first: it hands the link to the app that owns it
    // (YouTube, Maps, the mail client) instead of iOS' in-app Safari sheet,
    // which throws a PlatformException whenever its load fails.
    for (final mode in const [
      LaunchMode.externalApplication,
      LaunchMode.platformDefault,
    ]) {
      try {
        if (await launchUrl(uri, mode: mode)) return;
      } catch (e) {
        log('launching $uri as $mode failed: $e');
      }
    }
  }
}