// ignore: avoid_web_libraries_in_flutter
import 'dart:html' as html;

/// Web 端设备信息：浏览器无法稳定获取品牌/型号，系统名和版本从 UA 解析。
Future<void> initializeDeviceInfo() async {}

String getDeviceType() {
  try {
    final ua = html.window.navigator.userAgent;
    if (ua.contains('iPhone') || ua.contains('iPad') || ua.contains('iPod')) {
      return 'iOS';
    }
    if (ua.contains('Android')) return 'Android';
  } catch (_) {}
  return 'PC';
}

String getSystemName() => _osInfo().name;

String getSystemVersion() => _osInfo().version;

String getDeviceBrand() => '';

String getDeviceModel() => '';

String getUserAgent() {
  try {
    return html.window.navigator.userAgent;
  } catch (_) {
    return '';
  }
}

_OsInfo _osInfo() {
  try {
    return _parseOsInfo(html.window.navigator.userAgent);
  } catch (_) {
    return const _OsInfo('', '');
  }
}

_OsInfo _parseOsInfo(String ua) {
  if (ua.contains('iPhone') || ua.contains('iPad') || ua.contains('iPod')) {
    final match =
        RegExp(r'(?:CPU (?:iPhone )?OS|iPhone OS) ([\d_]+)').firstMatch(ua);
    if (match != null) {
      return _OsInfo('iOS', _normalizeVersion(match.group(1)));
    }
    return const _OsInfo('iOS', '');
  }

  if (ua.contains('Android')) {
    final match = RegExp(r'Android ([\d.]+)').firstMatch(ua);
    if (match != null) return _OsInfo('Android', match.group(1) ?? '');
    return const _OsInfo('Android', '');
  }

  final macMatch = RegExp(r'Mac OS X ([^;)]+)').firstMatch(ua);
  if (macMatch != null) {
    return _OsInfo('macOS', _normalizeVersion(macMatch.group(1)));
  }

  final windowsMatch = RegExp(r'Windows NT ([\d.]+)').firstMatch(ua);
  if (windowsMatch != null) {
    return _OsInfo('Windows', windowsMatch.group(1) ?? '');
  }

  final chromeOsMatch = RegExp(r'CrOS [^ ]+ ([\d.]+)').firstMatch(ua);
  if (chromeOsMatch != null) {
    return _OsInfo('ChromeOS', chromeOsMatch.group(1) ?? '');
  }

  if (ua.contains('Linux')) return const _OsInfo('Linux', '');
  return const _OsInfo('', '');
}

String _normalizeVersion(String? version) {
  return (version ?? '').replaceAll('_', '.').trim();
}

class _OsInfo {
  final String name;
  final String version;

  const _OsInfo(this.name, this.version);
}