// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// 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.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)

#include <memory>
#include <string>

#include "google/protobuf/testing/file.h"
#include "google/protobuf/testing/file.h"
#include "google/protobuf/compiler/command_line_interface.h"
#include "google/protobuf/compiler/python/generator.h"
#include "google/protobuf/testing/googletest.h"
#include <gtest/gtest.h>
#include "absl/strings/str_split.h"
#include "google/protobuf/io/printer.h"
#include "google/protobuf/io/zero_copy_stream.h"

namespace google {
namespace protobuf {
namespace compiler {
namespace python {
namespace {

class TestGenerator : public CodeGenerator {
 public:
  TestGenerator() {}
  ~TestGenerator() override {}

  bool Generate(const FileDescriptor* file, const std::string& parameter,
                GeneratorContext* context, std::string* error) const override {
    TryInsert("test_pb2.py", "imports", context);
    TryInsert("test_pb2.py", "module_scope", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar.Baz", context);
    return true;
  }

  void TryInsert(const std::string& filename,
                 const std::string& insertion_point,
                 GeneratorContext* context) const {
    std::unique_ptr<io::ZeroCopyOutputStream> output(
        context->OpenForInsert(filename, insertion_point));
    io::Printer printer(output.get(), '$');
    printer.Print("// inserted $name$\n", "name", insertion_point);
  }
};

// opposed to importlib) in the usual case where the .proto file paths do not
// not contain any Python keywords.
TEST(PythonPluginTest, ImportTest) {
  // Create files test1.proto and test2.proto with the former importing the
  // latter.
  GOOGLE_CHECK_OK(File::SetContents(TestTempDir() + "/test1.proto",
                             "syntax = \"proto3\";\n"
                             "package foo;\n"
                             "import \"test2.proto\";"
                             "message Message1 {\n"
                             "  Message2 message_2 = 1;\n"
                             "}\n",
                             true));
  GOOGLE_CHECK_OK(File::SetContents(TestTempDir() + "/test2.proto",
                             "syntax = \"proto3\";\n"
                             "package foo;\n"
                             "message Message2 {}\n",
                             true));

  compiler::CommandLineInterface cli;
  cli.SetInputsAreProtoPathRelative(true);
  python::Generator python_generator;
  cli.RegisterGenerator("--python_out", &python_generator, "");
  std::string proto_path = "-I" + TestTempDir();
  std::string python_out = "--python_out=" + TestTempDir();
  const char* argv[] = {"protoc", proto_path.c_str(), "-I.", python_out.c_str(),
                        "test1.proto"};
  ASSERT_EQ(0, cli.Run(5, argv));

  // Loop over the lines of the generated code and verify that we find an
  // ordinary Python import but do not find the string "importlib".
  std::string output;
  GOOGLE_CHECK_OK(File::GetContents(TestTempDir() + "/test1_pb2.py", &output,
                             true));
  std::vector<std::string> lines = absl::StrSplit(output, "\n");
  std::string expected_import = "import test2_pb2";
  bool found_expected_import = false;
  for (int i = 0; i < lines.size(); ++i) {
    if (lines[i].find(expected_import) != std::string::npos) {
      found_expected_import = true;
    }
    EXPECT_EQ(std::string::npos, lines[i].find("importlib"));
  }
  EXPECT_TRUE(found_expected_import);
}

}  // namespace
}  // namespace python
}  // namespace compiler
}  // namespace protobuf
}  // namespace google