import 'dart:io' show Platform;

import 'package:android_intent_plus/android_intent.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:url_launcher/url_launcher.dart';

typedef AndroidIntentLauncher = Future<void> Function(AndroidIntent intent);

abstract final class AppLinkUtil {
  static final _androidPackageNamePattern = RegExp(
    r'^[A-Za-z][A-Za-z0-9_]*(?:\.[A-Za-z][A-Za-z0-9_]*)+$',
  );

  static String targetAppFromUrl(String urlString) {
    final value = Uri.tryParse(urlString)?.queryParameters['targetApp']?.trim();
    if (value == null || !_androidPackageNamePattern.hasMatch(value)) return '';
    return value;
  }

  static Future<bool> openExternal(Uri uri, {String packageName = ''}) =>
      AppLinkLauncher(
        isAndroid: () => !kIsWeb && Platform.isAndroid,
        launchAndroidIntent: (intent) => intent.launch(),
      ).openExternal(uri, packageName: packageName);
}

class AppLinkLauncher {
  const AppLinkLauncher({
    required this.isAndroid,
    required this.launchAndroidIntent,
    this.launchExternal,
  });

  final bool Function() isAndroid;
  final AndroidIntentLauncher launchAndroidIntent;
  final Future<bool> Function(Uri uri)? launchExternal;

  Future<bool> openExternal(Uri uri, {String packageName = ''}) async {
    if (uri.host.isEmpty ||
        (uri.scheme.toLowerCase() != 'http' &&
            uri.scheme.toLowerCase() != 'https')) {
      return false;
    }
    if (isAndroid() && packageName.trim().isNotEmpty) {
      try {
        await launchAndroidIntent(
          AndroidIntent(
            action: 'action_view',
            data: uri.toString(),
            package: packageName.trim(),
          ),
        );
        return true;
      } catch (_) {}
    }
    final launcher = launchExternal;
    if (launcher != null) return launcher(uri);
    return launchUrl(uri, mode: LaunchMode.externalApplication);
  }
}