// 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
// this software without specific prior written permission.
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <memory>

#include <google/protobuf/testing/file.h>
#include <google/protobuf/testing/file.h>
#include <google/protobuf/compiler/cpp/generator.h>
#include <google/protobuf/compiler/command_line_interface.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>
#include <google/protobuf/compiler/annotation_test_util.h>
#include <google/protobuf/compiler/cpp/helpers.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {

namespace atu = annotation_test_util;

namespace {

class CppMetadataTest : public ::testing::Test {
 public:
  // Tries to capture a FileDescriptorProto, GeneratedCodeInfo, and output
  // code from the previously added file with name `filename`. Returns true on
  // success. If pb_h is non-null, expects a .pb.h and a .pb.h.meta (copied to
  // pb_h and pb_h_info respecfively); similarly for proto_h and proto_h_info.
  bool CaptureMetadata(const std::string& filename, FileDescriptorProto* file,
                       std::string* pb_h, GeneratedCodeInfo* pb_h_info,
                       std::string* proto_h, GeneratedCodeInfo* proto_h_info,
                       std::string* pb_cc) {
    CommandLineInterface cli;
    CppGenerator cpp_generator;
    cli.RegisterGenerator("--cpp_out", &cpp_generator, "");
    std::string cpp_out =
        "--cpp_out=annotate_headers=true,"
        "annotation_pragma_name=pragma_name,"
        "annotation_guard_name=guard_name:" +
        TestTempDir();

    const bool result = atu::RunProtoCompiler(filename, cpp_out, &cli, file);

    if (!result) {
      return result;
    }

    std::string output_base = TestTempDir() + "/" + StripProto(filename);

    if (pb_cc != nullptr) {
      GOOGLE_CHECK_OK(
          File::GetContents(output_base + ".pb.cc", pb_cc, true));
    }

    if (pb_h != nullptr && pb_h_info != nullptr) {
      GOOGLE_CHECK_OK(
          File::GetContents(output_base + ".pb.h", pb_h, true));
      if (!atu::DecodeMetadata(output_base + ".pb.h.meta", pb_h_info)) {
        return false;
      }
    }

    if (proto_h != nullptr && proto_h_info != nullptr) {
      GOOGLE_CHECK_OK(File::GetContents(output_base + ".proto.h", proto_h,
                                 true));
      if (!atu::DecodeMetadata(output_base + ".proto.h.meta", proto_h_info)) {
        return false;
      }
    }

    return true;
  }
};

const char kSmallTestFile[] =
    "syntax = \"proto2\";\n"
    "package foo;\n"
    "enum Enum { VALUE = 0; }\n"
    "message Message { }\n";

TEST_F(CppMetadataTest, CapturesEnumNames) {
  FileDescriptorProto file;
  GeneratedCodeInfo info;
  std::string pb_h;
  atu::AddFile("test.proto", kSmallTestFile);
  EXPECT_TRUE(CaptureMetadata("test.proto", &file, &pb_h, &info, nullptr,
                              nullptr, nullptr));
  EXPECT_EQ("Enum", file.enum_type(0).name());
  std::vector<int> enum_path;
  enum_path.push_back(FileDescriptorProto::kEnumTypeFieldNumber);
  enum_path.push_back(0);
  const GeneratedCodeInfo::Annotation* enum_annotation =
      atu::FindAnnotationOnPath(info, "test.proto", enum_path);
  EXPECT_TRUE(nullptr != enum_annotation);
  EXPECT_TRUE(atu::AnnotationMatchesSubstring(pb_h, enum_annotation, "Enum"));
}

TEST_F(CppMetadataTest, AddsPragma) {
  FileDescriptorProto file;
  GeneratedCodeInfo info;
  std::string pb_h;
  atu::AddFile("test.proto", kSmallTestFile);
  EXPECT_TRUE(CaptureMetadata("test.proto", &file, &pb_h, &info, nullptr,
                              nullptr, nullptr));
  EXPECT_TRUE(pb_h.find("#ifdef guard_name") != std::string::npos);
  EXPECT_TRUE(pb_h.find("#pragma pragma_name \"test.pb.h.meta\"") !=
              std::string::npos);
}

TEST_F(CppMetadataTest, CapturesMessageNames) {
  FileDescriptorProto file;
  GeneratedCodeInfo info;
  std::string pb_h;
  atu::AddFile("test.proto", kSmallTestFile);
  EXPECT_TRUE(CaptureMetadata("test.proto", &file, &pb_h, &info, nullptr,
                              nullptr, nullptr));
  EXPECT_EQ("Message", file.message_type(0).name());
  std::vector<int> message_path;
  message_path.push_back(FileDescriptorProto::kMessageTypeFieldNumber);
  message_path.push_back(0);
  const GeneratedCodeInfo::Annotation* message_annotation =
      atu::FindAnnotationOnPath(info, "test.proto", message_path);
  EXPECT_TRUE(nullptr != message_annotation);
  EXPECT_TRUE(
      atu::AnnotationMatchesSubstring(pb_h, message_annotation, "Message"));
}

}  // namespace
}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google