实战精研：构建高安全、多模态的 Flutter + OpenHarmony 智慧医疗健康应用（符合 HIPAA 与医疗器械软件规范）

// lib/services/secure_health_storage.dart
class SecureHealthStorage {
  static Future<void> saveEcgData(List<double> waveform) async {
    // 序列化为二进制
    final bytes = _encodeWaveform(waveform);
    
    // 存入 TEE，密钥由硬件生成
    await SecureElement.store(
      key: 'ecg_raw',
      data: bytes,
      encryption: EncryptionPolicy.hardwareBound,
    );
  }

  static Future<List<double>> loadEcgData() async {
    final bytes = await SecureElement.load('ecg_raw');
    return _decodeWaveform(bytes);
  }
}

class ConsentManager {
  Future<ConsentRecord> requestConsent({
    required String purpose,
    required List<String> dataTypes,
    required Duration validity,
  }) async {
    final record = ConsentRecord(
      id: Uuid().v4(),
      purpose: purpose,
      dataTypes: dataTypes,
      grantedAt: DateTime.now(),
      expiresAt: DateTime.now().add(validity),
      status: ConsentStatus.granted,
    );

    // 写入不可变日志
    await AuditLog.write('CONSENT_GRANTED', record.toJson());

    return record;
  }
}

abstract class MedicalDevice {
  String get deviceId;
  String get deviceName;
  DeviceType get type;

  Stream<HealthReading> get readings;
  Future<bool> connect();
  Future<void> disconnect();
}

enum DeviceType { bloodGlucose, ecgMonitor, bloodPressure, pulseOximeter }

class GlucoseMeter implements MedicalDevice {
  @override
  Future<bool> connect() async {
    if (!await Nfc.isAvailable()) return false;
    await Nfc.startPolling();
    return true;
  }

  @override
  Stream<HealthReading> get readings async* {
    await for (final tag in Nfc.tags) {
      if (tag.type == 'ISO14443') {
        final data = await tag.read();
        final glucose = _parseGlucoseFromNfc(data);
        yield HealthReading(
          type: ReadingType.glucose,
          value: glucose,
          unit: 'mmol/L',
          timestamp: DateTime.now(),
        );
      }
    }
  }
}

class SecureVideoCall {
  Future<void> startCall(String doctorId) async {
    final session = await AVSession.create(
      type: 'video_call',
      security: SecurityLevel.high, // 启用端到端加密
    );

    // 请求患者授权录制
    final consent = await ConsentManager().requestConsent(
      purpose: '远程问诊录像',
      dataTypes: ['video', 'audio'],
      validity: Duration(hours: 1),
    );

    if (consent.status == ConsentStatus.granted) {
      session.enableRecording(encryptKey: consent.id);
    }

    await session.connect(doctorId);
  }
}

// 表单配置（来自云端）
final formConfig = {
  "cardiology": [
    {"type": "slider", "label": "胸痛程度 (0-10)", "key": "chest_pain"},
    {"type": "date", "label": "首次发作时间", "key": "first_episode"},
  ]
};

// Flutter 动态渲染
Widget buildForm(String department) {
  final fields = formConfig[department] ?? [];
  return Column(
    children: fields.map((field) {
      switch (field['type']) {
        case 'slider':
          return SliderField(label: field['label'], key: field['key']);
        case 'date':
          return DateField(label: field['label'], key: field['key']);
        default:
          return Text('Unsupported field');
      }
    }).toList(),
  );
}