// Copyright 2017 Google Inc.
//
// 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 <thread>  // NOLINT(build/c++11)

#include "tink/primitive_set.h"
#include "tink/crypto_format.h"
#include "tink/mac.h"
#include "tink/util/test_util.h"
#include "gtest/gtest.h"
#include "proto/tink.pb.h"

using crypto::tink::test::DummyMac;
using google::crypto::tink::Keyset;
using google::crypto::tink::KeyStatusType;
using google::crypto::tink::OutputPrefixType;


namespace crypto {
namespace tink {
namespace {

class PrimitiveSetTest : public ::testing::Test {
};

void add_primitives(PrimitiveSet<Mac>* primitive_set,
                    int key_id_offset,
                    int primitives_count) {
  for (int i = 0; i < primitives_count; i++) {
    int key_id = key_id_offset + i;
    Keyset::Key key;
    key.set_output_prefix_type(OutputPrefixType::TINK);
    key.set_key_id(key_id);
    key.set_status(KeyStatusType::ENABLED);
    std::unique_ptr<Mac> mac(new DummyMac("dummy MAC"));
    auto add_result = primitive_set->AddPrimitive(std::move(mac), key);
    EXPECT_TRUE(add_result.ok()) << add_result.status();
  }
}

void access_primitives(PrimitiveSet<Mac>* primitive_set,
                       int key_id_offset,
                       int primitives_count) {
  for (int i = 0; i < primitives_count; i++) {
    int key_id = key_id_offset + i;
    Keyset::Key key;
    key.set_output_prefix_type(OutputPrefixType::TINK);
    key.set_key_id(key_id);
    key.set_status(KeyStatusType::ENABLED);
    std::string prefix = CryptoFormat::get_output_prefix(key).ValueOrDie();
    auto get_result = primitive_set->get_primitives(prefix);
    EXPECT_TRUE(get_result.ok()) << get_result.status();
    EXPECT_GE(get_result.ValueOrDie()->size(), 1);
  }
}

TEST_F(PrimitiveSetTest, ConcurrentOperations) {
  PrimitiveSet<Mac> mac_set;
  int offset_a = 100;
  int offset_b = 150;
  int count = 100;

  // Add some primitives.
  std::thread add_primitives_a(add_primitives, &mac_set, offset_a, count);
  std::thread add_primitives_b(add_primitives, &mac_set, offset_b, count);
  add_primitives_a.join();
  add_primitives_b.join();

  // Access primitives.
  std::thread access_primitives_a(access_primitives, &mac_set, offset_a, count);
  std::thread access_primitives_b(access_primitives, &mac_set, offset_b, count);
  access_primitives_a.join();
  access_primitives_b.join();

  // Verify the common key ids added by both threads.
  for (int key_id = offset_a; key_id < offset_b + count; key_id++) {
    Keyset::Key key;
    key.set_output_prefix_type(OutputPrefixType::TINK);
    key.set_key_id(key_id);
    key.set_status(KeyStatusType::ENABLED);
    std::string prefix = CryptoFormat::get_output_prefix(key).ValueOrDie();
    auto get_result = mac_set.get_primitives(prefix);
    EXPECT_TRUE(get_result.ok()) << get_result.status();
    auto macs = get_result.ValueOrDie();
    if (key_id >= offset_b && key_id < offset_a + count) {
      EXPECT_EQ(2, macs->size());  // overlapping key_id range
    } else {
      EXPECT_EQ(1, macs->size());
    }
  }
}

TEST_F(PrimitiveSetTest, Basic) {
  std::string mac_name_1 = "MAC#1";
  std::unique_ptr<Mac> mac_1(new DummyMac(mac_name_1));
  std::string mac_name_2 = "MAC#2";
  std::unique_ptr<Mac> mac_2(new DummyMac(mac_name_2));
  std::string mac_name_3 = "MAC#3";
  std::unique_ptr<Mac> mac_3(new DummyMac(mac_name_3));
  std::string mac_name_4 = "MAC#3";
  std::unique_ptr<Mac> mac_4(new DummyMac(mac_name_4));
  std::string mac_name_5 = "MAC#3";
  std::unique_ptr<Mac> mac_5(new DummyMac(mac_name_5));
  std::string mac_name_6 = "MAC#3";
  std::unique_ptr<Mac> mac_6(new DummyMac(mac_name_6));

  uint32_t key_id_1 = 1234543;
  Keyset::Key key_1;
  key_1.set_output_prefix_type(OutputPrefixType::TINK);
  key_1.set_key_id(key_id_1);
  key_1.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_2 = 7213743;
  Keyset::Key key_2;
  key_2.set_output_prefix_type(OutputPrefixType::LEGACY);
  key_2.set_key_id(key_id_2);
  key_2.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_3 = key_id_2;    // same id as key_2
  Keyset::Key key_3;
  key_3.set_output_prefix_type(OutputPrefixType::TINK);
  key_3.set_key_id(key_id_3);
  key_3.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_4 = 947327;
  Keyset::Key key_4;
  key_4.set_output_prefix_type(OutputPrefixType::RAW);
  key_4.set_key_id(key_id_4);
  key_4.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_5 = 529472;
  Keyset::Key key_5;
  key_5.set_output_prefix_type(OutputPrefixType::RAW);
  key_5.set_key_id(key_id_5);
  key_5.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_6 = key_id_1;    // same id as key_1
  Keyset::Key key_6;
  key_6.set_output_prefix_type(OutputPrefixType::TINK);
  key_6.set_key_id(key_id_6);
  key_6.set_status(KeyStatusType::ENABLED);

  PrimitiveSet<Mac> primitive_set;
  EXPECT_TRUE(primitive_set.get_primary() == nullptr);
  EXPECT_EQ(util::error::NOT_FOUND,
            primitive_set.get_raw_primitives().status().error_code());
  EXPECT_EQ(util::error::NOT_FOUND,
            primitive_set.get_primitives("prefix").status().error_code());

  // Add all the primitives.
  auto add_primitive_result =
      primitive_set.AddPrimitive(std::move(mac_1), key_1);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();

  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_2), key_2);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();

  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_3), key_3);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
  primitive_set.set_primary(add_primitive_result.ValueOrDie());

  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_4), key_4);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();

  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_5), key_5);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();

  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_6), key_6);
  EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();

  // Try adding a "consumed" unique_ptr as a primitive.
  add_primitive_result = primitive_set.AddPrimitive(std::move(mac_6), key_6);
  EXPECT_FALSE(add_primitive_result.ok());
  EXPECT_EQ(util::error::INVALID_ARGUMENT,
            add_primitive_result.status().error_code());


  std::string data = "some data";

  {  // Check the primary.
    auto primary = primitive_set.get_primary();
    EXPECT_FALSE(primary == nullptr);
    EXPECT_EQ(KeyStatusType::ENABLED, primary->get_status());
    EXPECT_EQ(DummyMac(mac_name_3).ComputeMac(data).ValueOrDie(),
              primary->get_primitive().ComputeMac(data).ValueOrDie());
  }

  {  // Check raw primitives.
    auto& primitives = *(primitive_set.get_raw_primitives().ValueOrDie());
    EXPECT_EQ(2, primitives.size());
    EXPECT_EQ(DummyMac(mac_name_4).ComputeMac(data).ValueOrDie(),
              primitives[0]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[0]->get_status());
    EXPECT_EQ(OutputPrefixType::RAW, primitives[0]->get_output_prefix_type());
    EXPECT_EQ(DummyMac(mac_name_5).ComputeMac(data).ValueOrDie(),
              primitives[1]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[1]->get_status());
    EXPECT_EQ(OutputPrefixType::RAW, primitives[1]->get_output_prefix_type());
  }

  {  // Check Tink primitives.
    std::string prefix = CryptoFormat::get_output_prefix(key_1).ValueOrDie();
    auto& primitives = *(primitive_set.get_primitives(prefix).ValueOrDie());
    EXPECT_EQ(2, primitives.size());
    EXPECT_EQ(DummyMac(mac_name_1).ComputeMac(data).ValueOrDie(),
              primitives[0]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[0]->get_status());
    EXPECT_EQ(OutputPrefixType::TINK, primitives[0]->get_output_prefix_type());
    EXPECT_EQ(DummyMac(mac_name_6).ComputeMac(data).ValueOrDie(),
              primitives[1]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[1]->get_status());
    EXPECT_EQ(OutputPrefixType::TINK, primitives[1]->get_output_prefix_type());
  }

  {  // Check another Tink primitive.
    std::string prefix = CryptoFormat::get_output_prefix(key_3).ValueOrDie();
    auto& primitives = *(primitive_set.get_primitives(prefix).ValueOrDie());
    EXPECT_EQ(1, primitives.size());
    EXPECT_EQ(DummyMac(mac_name_3).ComputeMac(data).ValueOrDie(),
              primitives[0]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[0]->get_status());
    EXPECT_EQ(OutputPrefixType::TINK, primitives[0]->get_output_prefix_type());
  }

  {  // Check legacy primitive.
    std::string prefix = CryptoFormat::get_output_prefix(key_2).ValueOrDie();
    auto& primitives = *(primitive_set.get_primitives(prefix).ValueOrDie());
    EXPECT_EQ(1, primitives.size());
    EXPECT_EQ(DummyMac(mac_name_2).ComputeMac(data).ValueOrDie(),
              primitives[0]->get_primitive().ComputeMac(data).ValueOrDie());
    EXPECT_EQ(KeyStatusType::ENABLED, primitives[0]->get_status());
    EXPECT_EQ(OutputPrefixType::LEGACY,
              primitives[0]->get_output_prefix_type());
  }
}

TEST_F(PrimitiveSetTest, PrimaryKeyWithIdCollisions) {
  std::string mac_name_1 = "MAC#1";
  std::string mac_name_2 = "MAC#2";

  uint32_t key_id_1 = 1234543;
  Keyset::Key key_1;
  key_1.set_key_id(key_id_1);
  key_1.set_status(KeyStatusType::ENABLED);

  uint32_t key_id_2 = key_id_1;    // same id as key_2
  Keyset::Key key_2;
  key_2.set_key_id(key_id_2);
  key_2.set_status(KeyStatusType::ENABLED);

  {  // Test with RAW-keys.
    std::unique_ptr<Mac> mac_1(new DummyMac(mac_name_1));
    std::unique_ptr<Mac> mac_2(new DummyMac(mac_name_2));
    key_1.set_output_prefix_type(OutputPrefixType::RAW);
    key_2.set_output_prefix_type(OutputPrefixType::RAW);
    PrimitiveSet<Mac> primitive_set;
    EXPECT_TRUE(primitive_set.get_primary() == nullptr);

    // Add the first primitive, and set it as primary.
    auto add_primitive_result =
        primitive_set.AddPrimitive(std::move(mac_1), key_1);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    primitive_set.set_primary(add_primitive_result.ValueOrDie());

    std::string identifier = "";
    const auto& primitives =
        *(primitive_set.get_primitives(identifier).ValueOrDie());
    EXPECT_EQ(1, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());

    //  Adding another primitive should not invalidate the primary.
    add_primitive_result = primitive_set.AddPrimitive(std::move(mac_2), key_2);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    EXPECT_EQ(2, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());
  }

  {  // Test with TINK-keys.
    std::unique_ptr<Mac> mac_1(new DummyMac(mac_name_1));
    std::unique_ptr<Mac> mac_2(new DummyMac(mac_name_2));
    key_1.set_output_prefix_type(OutputPrefixType::TINK);
    key_2.set_output_prefix_type(OutputPrefixType::TINK);
    PrimitiveSet<Mac> primitive_set;
    EXPECT_TRUE(primitive_set.get_primary() == nullptr);

    // Add the first primitive, and set it as primary.
    auto add_primitive_result =
        primitive_set.AddPrimitive(std::move(mac_1), key_1);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    primitive_set.set_primary(add_primitive_result.ValueOrDie());

    std::string identifier = CryptoFormat::get_output_prefix(key_1).ValueOrDie();
    const auto& primitives =
        *(primitive_set.get_primitives(identifier).ValueOrDie());
    EXPECT_EQ(1, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());

    //  Adding another primitive should not invalidate the primary.
    add_primitive_result = primitive_set.AddPrimitive(std::move(mac_2), key_2);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    EXPECT_EQ(2, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());
  }

  {  // Test with LEGACY-keys.
    std::unique_ptr<Mac> mac_1(new DummyMac(mac_name_1));
    std::unique_ptr<Mac> mac_2(new DummyMac(mac_name_2));
    key_1.set_output_prefix_type(OutputPrefixType::LEGACY);
    key_2.set_output_prefix_type(OutputPrefixType::LEGACY);
    PrimitiveSet<Mac> primitive_set;
    EXPECT_TRUE(primitive_set.get_primary() == nullptr);

    // Add the first primitive, and set it as primary.
    auto add_primitive_result =
        primitive_set.AddPrimitive(std::move(mac_1), key_1);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    primitive_set.set_primary(add_primitive_result.ValueOrDie());

    std::string identifier = CryptoFormat::get_output_prefix(key_1).ValueOrDie();
    const auto& primitives =
        *(primitive_set.get_primitives(identifier).ValueOrDie());
    EXPECT_EQ(1, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());

    //  Adding another primitive should not invalidate the primary.
    add_primitive_result = primitive_set.AddPrimitive(std::move(mac_2), key_2);
    EXPECT_TRUE(add_primitive_result.ok()) << add_primitive_result.status();
    EXPECT_EQ(2, primitives.size());
    EXPECT_EQ(primitive_set.get_primary(), primitives[0].get());
  }
}

TEST_F(PrimitiveSetTest, DisabledKey) {
  std::string mac_name_1 = "MAC#1";
  std::unique_ptr<Mac> mac_1(new DummyMac(mac_name_1));

  uint32_t key_id_1 = 1234543;
  Keyset::Key key_1;
  key_1.set_output_prefix_type(OutputPrefixType::TINK);
  key_1.set_key_id(key_id_1);
  key_1.set_status(KeyStatusType::DISABLED);

  PrimitiveSet<Mac> primitive_set;
  // Add all the primitives.
  auto add_primitive_result =
      primitive_set.AddPrimitive(std::move(mac_1), key_1);
  EXPECT_FALSE(add_primitive_result.ok());
}

}  // namespace
}  // namespace tink
}  // namespace crypto