/*
 * Copyright (C) 2018 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.
 */

#include "chre/util/nanoapp/app_id.h"
#include "chre_host/host_protocol_host.h"
#include "chre_host/log.h"
#include "chre_host/socket_client.h"

#include <inttypes.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <fstream>
#include <thread>

#include <cutils/sockets.h>
#include <utils/StrongPointer.h>

/**
 * @file
 * A test utility that loads the audio stress test nanoapp and quits.
 */

using android::sp;
using android::chre::getStringFromByteVector;
using android::chre::FragmentedLoadTransaction;
using android::chre::HostProtocolHost;
using android::chre::IChreMessageHandlers;
using android::chre::SocketClient;
using flatbuffers::FlatBufferBuilder;

// Aliased for consistency with the way these symbols are referenced in
// CHRE-side code
namespace fbs = ::chre::fbs;

namespace {

class SocketCallbacks : public SocketClient::ICallbacks,
                        public IChreMessageHandlers {
 public:
  void onMessageReceived(const void *data, size_t length) override {
    if (!HostProtocolHost::decodeMessageFromChre(data, length, *this)) {
      LOGE("Failed to decode message");
    }
  }

  void onConnected() override {
    LOGI("Socket (re)connected");
  }

  void onConnectionAborted() override {
    LOGI("Socket (re)connection aborted");
  }

  void onDisconnected() override {
    LOGI("Socket disconnected");
  }

  void handleLoadNanoappResponse(const fbs::LoadNanoappResponseT& response)
      override {
    LOGI("Got load nanoapp response, transaction ID 0x%" PRIx32 " result %d",
         response.transaction_id, response.success);
  }
};

void sendLoadNanoappRequest(SocketClient& client, const char *filename,
                            uint64_t appId, uint32_t appVersion) {
  std::ifstream file(filename, std::ios::binary | std::ios::ate);
  if (!file) {
    LOGE("Couldn't open file '%s': %s", filename, strerror(errno));
    return;
  }
  ssize_t size = file.tellg();
  file.seekg(0, std::ios::beg);

  std::vector<uint8_t> buffer(size);
  if (!file.read(reinterpret_cast<char *>(buffer.data()), size)) {
    LOGE("Couldn't read from file: %s", strerror(errno));
    return;
  }

  // Perform loading with 1 fragment for simplicity
  FlatBufferBuilder builder(size + 128);
  FragmentedLoadTransaction transaction = FragmentedLoadTransaction(
      1 /* transactionId */, appId, appVersion,
      0x01000000 /* targetApiVersion */, buffer,
      buffer.size() /* fragmentSize */);
  HostProtocolHost::encodeFragmentedLoadNanoappRequest(
      builder, transaction.getNextRequest());

  LOGI("Sending load nanoapp request (%" PRIu32 " bytes total w/%zu bytes of "
       "payload)", builder.GetSize(), buffer.size());
  if (!client.sendMessage(builder.GetBufferPointer(), builder.GetSize())) {
    LOGE("Failed to send message");
  }
}

}  // anonymous namespace

int main() {
  SocketClient client;
  sp<SocketCallbacks> callbacks = new SocketCallbacks();

  if (!client.connect("chre", callbacks)) {
    LOGE("Couldn't connect to socket");
  } else {
    sendLoadNanoappRequest(client, "/data/audio_stress_test.so",
                           chre::kAudioStressTestAppId,
                           1 /* appVersion */);
  }

  return 0;
}