// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <google/protobuf/arenastring.h>

#include <algorithm>
#include <cstdlib>
#include <memory>
#include <string>
#include <vector>

#include <google/protobuf/stubs/logging.h>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/generated_message_util.h>
#include <google/protobuf/message_lite.h>
#include <gtest/gtest.h>
#include <google/protobuf/stubs/strutil.h>


// Must be included last.
#include <google/protobuf/port_def.inc>

namespace google {
namespace protobuf {

using internal::ArenaStringPtr;

using EmptyDefault = ArenaStringPtr::EmptyDefault;

const internal::LazyString nonempty_default{{{"default", 7}}, {nullptr}};
const std::string* empty_default = &internal::GetEmptyString();

class SingleArena : public testing::TestWithParam<bool> {
 public:
  std::unique_ptr<Arena> GetArena() {
    if (this->GetParam()) return nullptr;
    return std::unique_ptr<Arena>(new Arena());
  }
};

INSTANTIATE_TEST_SUITE_P(ArenaString, SingleArena, testing::Bool());

TEST_P(SingleArena, GetSet) {
  auto arena = GetArena();
  ArenaStringPtr field;
  field.UnsafeSetDefault(empty_default);
  EXPECT_EQ("", field.Get());
  field.Set(empty_default, "Test short", arena.get());
  EXPECT_EQ("Test short", field.Get());
  field.Set(empty_default, "Test long long long long value", arena.get());
  EXPECT_EQ("Test long long long long value", field.Get());
  field.Set(empty_default, "", arena.get());
  field.Destroy(empty_default, arena.get());
}

TEST_P(SingleArena, MutableAccessor) {
  auto arena = GetArena();
  ArenaStringPtr field;
  const std::string* empty_default = &internal::GetEmptyString();
  field.UnsafeSetDefault(empty_default);

  std::string* mut = field.Mutable(EmptyDefault{}, arena.get());
  EXPECT_EQ(mut, field.Mutable(EmptyDefault{}, arena.get()));
  EXPECT_EQ(mut, &field.Get());
  EXPECT_NE(empty_default, mut);
  EXPECT_EQ("", *mut);
  *mut = "Test long long long long value";  // ensure string allocates storage
  EXPECT_EQ("Test long long long long value", field.Get());
  field.Destroy(empty_default, arena.get());
}

TEST_P(SingleArena, NullDefault) {
  auto arena = GetArena();

  ArenaStringPtr field;
  field.UnsafeSetDefault(nullptr);
  std::string* mut = field.Mutable(nonempty_default, arena.get());
  EXPECT_EQ(mut, field.Mutable(nonempty_default, arena.get()));
  EXPECT_EQ(mut, &field.Get());
  EXPECT_NE(nullptr, mut);
  EXPECT_EQ("default", *mut);
  *mut = "Test long long long long value";  // ensure string allocates storage
  EXPECT_EQ("Test long long long long value", field.Get());
  field.Destroy(nullptr, arena.get());
}

class DualArena : public testing::TestWithParam<std::tuple<bool, bool>> {
 public:
  std::unique_ptr<Arena> GetLhsArena() {
    if (std::get<0>(this->GetParam())) return nullptr;
    return std::unique_ptr<Arena>(new Arena());
  }
  std::unique_ptr<Arena> GetRhsArena() {
    if (std::get<1>(this->GetParam())) return nullptr;
    return std::unique_ptr<Arena>(new Arena());
  }
};

INSTANTIATE_TEST_SUITE_P(ArenaString, DualArena,
                         testing::Combine(testing::Bool(), testing::Bool()));

TEST_P(DualArena, Swap) {
  auto lhs_arena = GetLhsArena();
  ArenaStringPtr lhs;
  lhs.UnsafeSetDefault(empty_default);
  ArenaStringPtr rhs;
  rhs.UnsafeSetDefault(empty_default);

  {
    auto rhs_arena = GetRhsArena();
    lhs.Set(empty_default, "lhs value that has some heft", lhs_arena.get());
    rhs.Set(empty_default, "rhs value that has some heft", rhs_arena.get());
    ArenaStringPtr::InternalSwap(empty_default,          //
                                 &lhs, lhs_arena.get(),  //
                                 &rhs, rhs_arena.get());
    EXPECT_EQ("rhs value that has some heft", lhs.Get());
    EXPECT_EQ("lhs value that has some heft", rhs.Get());
    lhs.Destroy(empty_default, rhs_arena.get());
  }
  EXPECT_EQ("lhs value that has some heft", rhs.Get());
  rhs.Destroy(empty_default, lhs_arena.get());
}


}  // namespace protobuf
}  // namespace google

#include <google/protobuf/port_undef.inc>