/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _INTERFACE_CONTROLLER_H
#define _INTERFACE_CONTROLLER_H

#include <functional>
#include <string>

#include <netdutils/Status.h>
#include <netdutils/StatusOr.h>

// TODO: move InterfaceController into android::net namespace.
namespace android {
namespace net {
class StablePrivacyTest;
}  // namespace net
}  // namespace android

class InterfaceController {
public:
    static void initializeAll();

    static int setEnableIPv6(const char *interface, const int on);
    static android::netdutils::Status setIPv6AddrGenMode(const std::string& interface, int mode);
    static int setAcceptIPv6Ra(const char *interface, const int on);
    static int setAcceptIPv6Dad(const char *interface, const int on);
    static int setIPv6DadTransmits(const char *interface, const char *value);
    static int setIPv6PrivacyExtensions(const char *interface, const int on);
    static int setMtu(const char *interface, const char *mtu);
    static int addAddress(const char *interface, const char *addrString, int prefixLength);
    static int delAddress(const char *interface, const char *addrString, int prefixLength);

    // Read and write values in files of the form:
    //     /proc/sys/net/<family>/<which>/<interface>/<parameter>
    static int getParameter(
            const char *family, const char *which, const char *interface, const char *parameter,
            std::string *value);
    static int setParameter(
            const char *family, const char *which, const char *interface, const char *parameter,
            const char *value);

    static android::netdutils::StatusOr<std::vector<std::string>> getIfaceNames();
    static android::netdutils::StatusOr<std::map<std::string, uint32_t>> getIfaceList();

private:
  friend class android::net::StablePrivacyTest;

  using GetPropertyFn =
      std::function<std::string(const std::string& key, const std::string& dflt)>;
  using SetPropertyFn =
      std::function<android::netdutils::Status(const std::string& key, const std::string& val)>;

  // Helper function exported from this compilation unit for testing.
  static android::netdutils::Status enableStablePrivacyAddresses(const std::string& iface,
                                                                 GetPropertyFn getProperty,
                                                                 SetPropertyFn setProperty);

  static void setAcceptRA(const char* value);
  static void setAcceptRARouteTable(int tableOrOffset);
  static void setBaseReachableTimeMs(unsigned int millis);
  static void setIPv6OptimisticMode(const char* value);

  InterfaceController() = delete;
  ~InterfaceController() = delete;
};

#endif