// 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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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <string>
#include <memory>
#include <vector>

#include <google/protobuf/test_util.h>
#include <google/protobuf/unittest.pb.h>
#include <google/protobuf/unittest_proto3_arena.pb.h>
#include <google/protobuf/arena.h>
#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>

using proto3_arena_unittest::TestAllTypes;

namespace google {
namespace protobuf {
namespace {
// We selectively set/check a few representative fields rather than all fields
// as this test is only expected to cover the basics of arena support.
void SetAllFields(TestAllTypes* m) {
  m->set_optional_int32(100);
  m->set_optional_string("asdf");
  m->set_optional_bytes("jkl;");
  m->mutable_optional_nested_message()->set_bb(42);
  m->mutable_optional_foreign_message()->set_c(43);
  m->set_optional_nested_enum(
      proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ);
  m->set_optional_foreign_enum(
      proto3_arena_unittest::FOREIGN_BAZ);
  m->mutable_optional_lazy_message()->set_bb(45);
  m->add_repeated_int32(100);
  m->add_repeated_string("asdf");
  m->add_repeated_bytes("jkl;");
  m->add_repeated_nested_message()->set_bb(46);
  m->add_repeated_foreign_message()->set_c(47);
  m->add_repeated_nested_enum(
      proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ);
  m->add_repeated_foreign_enum(
      proto3_arena_unittest::FOREIGN_BAZ);
  m->add_repeated_lazy_message()->set_bb(49);

  m->set_oneof_uint32(1);
  m->mutable_oneof_nested_message()->set_bb(50);
  m->set_oneof_string("test");  // only this one remains set
}

void ExpectAllFieldsSet(const TestAllTypes& m) {
  EXPECT_EQ(100, m.optional_int32());
  EXPECT_EQ("asdf", m.optional_string());
  EXPECT_EQ("jkl;", m.optional_bytes());
  EXPECT_EQ(true, m.has_optional_nested_message());
  EXPECT_EQ(42, m.optional_nested_message().bb());
  EXPECT_EQ(true, m.has_optional_foreign_message());
  EXPECT_EQ(43, m.optional_foreign_message().c());
  EXPECT_EQ(proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ,
            m.optional_nested_enum());
  EXPECT_EQ(proto3_arena_unittest::FOREIGN_BAZ,
            m.optional_foreign_enum());
  EXPECT_EQ(true, m.has_optional_lazy_message());
  EXPECT_EQ(45, m.optional_lazy_message().bb());

  EXPECT_EQ(1, m.repeated_int32_size());
  EXPECT_EQ(100, m.repeated_int32(0));
  EXPECT_EQ(1, m.repeated_string_size());
  EXPECT_EQ("asdf", m.repeated_string(0));
  EXPECT_EQ(1, m.repeated_bytes_size());
  EXPECT_EQ("jkl;", m.repeated_bytes(0));
  EXPECT_EQ(1, m.repeated_nested_message_size());
  EXPECT_EQ(46, m.repeated_nested_message(0).bb());
  EXPECT_EQ(1, m.repeated_foreign_message_size());
  EXPECT_EQ(47, m.repeated_foreign_message(0).c());
  EXPECT_EQ(1, m.repeated_nested_enum_size());
  EXPECT_EQ(proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ,
            m.repeated_nested_enum(0));
  EXPECT_EQ(1, m.repeated_foreign_enum_size());
  EXPECT_EQ(proto3_arena_unittest::FOREIGN_BAZ,
            m.repeated_foreign_enum(0));
  EXPECT_EQ(1, m.repeated_lazy_message_size());
  EXPECT_EQ(49, m.repeated_lazy_message(0).bb());

  EXPECT_EQ(proto3_arena_unittest::TestAllTypes::kOneofString,
            m.oneof_field_case());
  EXPECT_EQ("test", m.oneof_string());
}

// In this file we only test some basic functionalities of arena support in
// proto3 and expect the arena support to be fully tested in proto2 unittests
// because proto3 shares most code with proto2.

TEST(Proto3ArenaTest, Parsing) {
  TestAllTypes original;
  SetAllFields(&original);

  Arena arena;
  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
  arena_message->ParseFromString(original.SerializeAsString());
  ExpectAllFieldsSet(*arena_message);
}

TEST(Proto3ArenaTest, UnknownFields) {
  TestAllTypes original;
  SetAllFields(&original);

  Arena arena;
  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
  arena_message->ParseFromString(original.SerializeAsString());
  ExpectAllFieldsSet(*arena_message);

  // In proto3 we can still get a pointer to the UnknownFieldSet through
  // reflection API.
  UnknownFieldSet* unknown_fields =
      arena_message->GetReflection()->MutableUnknownFields(arena_message);
  // We can modify this UnknownFieldSet.
  unknown_fields->AddVarint(1, 2);
  // And the unknown fields should be changed.
  ASSERT_NE(original.ByteSize(), arena_message->ByteSize());
  ASSERT_FALSE(
      arena_message->GetReflection()->GetUnknownFields(*arena_message).empty());
}

TEST(Proto3ArenaTest, Swap) {
  Arena arena1;
  Arena arena2;

  // Test Swap().
  TestAllTypes* arena1_message = Arena::CreateMessage<TestAllTypes>(&arena1);
  TestAllTypes* arena2_message = Arena::CreateMessage<TestAllTypes>(&arena2);
  arena1_message->Swap(arena2_message);
  EXPECT_EQ(&arena1, arena1_message->GetArena());
  EXPECT_EQ(&arena2, arena2_message->GetArena());
}

TEST(Proto3ArenaTest, SetAllocatedMessage) {
  Arena arena;
  TestAllTypes *arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
  TestAllTypes::NestedMessage* nested = new TestAllTypes::NestedMessage;
  nested->set_bb(118);
  arena_message->set_allocated_optional_nested_message(nested);
  EXPECT_EQ(118, arena_message->optional_nested_message().bb());
}

TEST(Proto3ArenaTest, ReleaseMessage) {
  Arena arena;
  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
  arena_message->mutable_optional_nested_message()->set_bb(118);
  std::unique_ptr<TestAllTypes::NestedMessage> nested(
      arena_message->release_optional_nested_message());
  EXPECT_EQ(118, nested->bb());
}

TEST(Proto3ArenaTest, MessageFieldClear) {
  // GitHub issue #310: https://github.com/protocolbuffers/protobuf/issues/310
  Arena arena;
  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
  arena_message->mutable_optional_nested_message()->set_bb(118);
  // This should not crash, but prior to the bugfix, it tried to use `operator
  // delete` the nested message (which is on the arena):
  arena_message->Clear();
}

TEST(Proto3ArenaTest, MessageFieldClearViaReflection) {
  Arena arena;
  TestAllTypes* message = Arena::CreateMessage<TestAllTypes>(&arena);
  const Reflection* r = message->GetReflection();
  const Descriptor* d = message->GetDescriptor();
  const FieldDescriptor* msg_field = d->FindFieldByName(
      "optional_nested_message");

  message->mutable_optional_nested_message()->set_bb(1);
  r->ClearField(message, msg_field);
  EXPECT_FALSE(message->has_optional_nested_message());
  EXPECT_EQ(0, message->optional_nested_message().bb());
}

}  // namespace
}  // namespace protobuf
}  // namespace google
