/*
 * Copyright (C) 2016 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.
 */

#define LOG_TAG "memtrack_hidl_hal_test"
#include <android-base/logging.h>
#include <android-base/unique_fd.h>

#include <android/hardware/memtrack/1.0/IMemtrack.h>

#include <gtest/gtest.h>
#include <hidl/GtestPrinter.h>
#include <hidl/ServiceManagement.h>

#include <fcntl.h>
#include <algorithm>
#include <vector>

using ::android::hardware::memtrack::V1_0::IMemtrack;
using ::android::hardware::memtrack::V1_0::MemtrackRecord;
using ::android::hardware::memtrack::V1_0::MemtrackFlag;
using ::android::hardware::memtrack::V1_0::MemtrackType;
using ::android::hardware::memtrack::V1_0::MemtrackStatus;
using ::android::hardware::hidl_vec;
using ::android::hardware::Return;
using ::android::sp;
using ::android::base::unique_fd;
using std::vector;
using std::count_if;

class MemtrackHidlTest : public ::testing::TestWithParam<std::string> {
 public:
  virtual void SetUp() override {
      memtrack = IMemtrack::getService(GetParam());
      ASSERT_NE(memtrack, nullptr);
  }

  virtual void TearDown() override {}

  sp<IMemtrack> memtrack;
};

/* Returns true if flags contains at least min, and no more than max,
 * of the flags in flagSet. Returns false otherwise.
 */
bool rightFlagCount(uint32_t flags, vector<MemtrackFlag> flagSet, uint32_t min,
                    uint32_t max) {
  uint32_t count =
      count_if(flagSet.begin(), flagSet.end(),
               [&](MemtrackFlag f) { return flags & (uint32_t)f; });
  return (min <= count && count <= max);
}

/* Returns true when passed a valid, defined status, false otherwise.
 */
bool validStatus(MemtrackStatus s) {
  vector<MemtrackStatus> statusVec = {
      MemtrackStatus::SUCCESS, MemtrackStatus::MEMORY_TRACKING_NOT_SUPPORTED,
      MemtrackStatus::TYPE_NOT_SUPPORTED};
  return std::find(statusVec.begin(), statusVec.end(), s) != statusVec.end();
}

auto generate_cb(MemtrackStatus *s, hidl_vec<MemtrackRecord> *v) {
  return [=](MemtrackStatus status, hidl_vec<MemtrackRecord> vec) {
    *s = status;
    *v = vec;
  };
}

/* Sanity check results when getMemory() is passed a negative PID
 */
TEST_P(MemtrackHidlTest, BadPidTest) {
  MemtrackStatus s;
  hidl_vec<MemtrackRecord> v;
  auto cb = generate_cb(&s, &v);
  for (uint32_t i = 0; i < static_cast<uint32_t>(MemtrackType::NUM_TYPES);
       i++) {
    Return<void> ret =
        memtrack->getMemory(-1, static_cast<MemtrackType>(i), cb);
    ASSERT_TRUE(ret.isOk());
    ASSERT_TRUE(validStatus(s));
  }
}

/* Sanity check results when getMemory() is passed a bad memory usage type
 */
TEST_P(MemtrackHidlTest, BadTypeTest) {
  MemtrackStatus s;
  hidl_vec<MemtrackRecord> v;
  auto cb = generate_cb(&s, &v);
  Return<void> ret = memtrack->getMemory(getpid(), MemtrackType::NUM_TYPES, cb);
  ASSERT_TRUE(ret.isOk());
  ASSERT_TRUE(validStatus(s));
}

/* Call memtrack on this process and check that the results are reasonable
 * for all memory types, including valid flag combinations for every
 * MemtrackRecord returned.
 */
TEST_P(MemtrackHidlTest, GetMemoryTest) {
  /* Opening this device causes the kernel to provide memtrack with memory
   * info for this process.
   */
  unique_fd fd(open("/dev/kgsl-3d0", O_RDWR));

  MemtrackStatus s;
  hidl_vec<MemtrackRecord> v;
  auto cb = generate_cb(&s, &v);
  uint32_t unsupportedCount = 0;
  for (uint32_t i = 0; i < static_cast<uint32_t>(MemtrackType::NUM_TYPES);
       i++) {
    Return<void> ret =
        memtrack->getMemory(getpid(), static_cast<MemtrackType>(i), cb);
    ASSERT_TRUE(ret.isOk());

    switch (s) {
      case MemtrackStatus::MEMORY_TRACKING_NOT_SUPPORTED:
        unsupportedCount++;
        break;
      case MemtrackStatus::TYPE_NOT_SUPPORTED:
        break;
      case MemtrackStatus::SUCCESS: {
        for (uint32_t j = 0; j < v.size(); j++) {
          // Enforce flag constraints
          vector<MemtrackFlag> smapFlags = {MemtrackFlag::SMAPS_ACCOUNTED,
                                            MemtrackFlag::SMAPS_UNACCOUNTED};
          EXPECT_TRUE(rightFlagCount(v[j].flags, smapFlags, 1, 1));
          vector<MemtrackFlag> shareFlags = {MemtrackFlag::SHARED,
                                             MemtrackFlag::SHARED_PSS,
                                             MemtrackFlag::PRIVATE};
          EXPECT_TRUE(rightFlagCount(v[j].flags, shareFlags, 0, 1));
          vector<MemtrackFlag> systemFlags = {MemtrackFlag::SYSTEM,
                                              MemtrackFlag::DEDICATED};
          EXPECT_TRUE(rightFlagCount(v[j].flags, systemFlags, 0, 1));
          vector<MemtrackFlag> secureFlags = {MemtrackFlag::SECURE,
                                              MemtrackFlag::NONSECURE};
          EXPECT_TRUE(rightFlagCount(v[j].flags, secureFlags, 0, 1));
        }
        break;
      }
      default:
        FAIL();
    }
  }
  // If tracking is not supported this should be returned for all types.
  ASSERT_TRUE(unsupportedCount == 0 ||
              unsupportedCount ==
                  static_cast<uint32_t>(MemtrackType::NUM_TYPES));
}

GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(MemtrackHidlTest);
INSTANTIATE_TEST_SUITE_P(
        PerInstance, MemtrackHidlTest,
        testing::ValuesIn(android::hardware::getAllHalInstanceNames(IMemtrack::descriptor)),
        android::hardware::PrintInstanceNameToString);
