// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/test/python_utils.h"

#include <memory>

#include "base/base_paths.h"
#include "base/command_line.h"
#include "base/environment.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "build/build_config.h"

#if defined(OS_MACOSX)
#include "base/mac/foundation_util.h"
#endif

namespace {
const base::FilePath::CharType kPythonPathEnv[] =
    FILE_PATH_LITERAL("PYTHONPATH");
const base::FilePath::CharType kVPythonClearPathEnv[] =
    FILE_PATH_LITERAL("VPYTHON_CLEAR_PYTHONPATH");
}  // namespace

void SetPythonPathInEnvironment(const std::vector<base::FilePath>& python_path,
                                base::EnvironmentMap* map) {
  base::NativeEnvironmentString path_str;
  for (const auto& path : python_path) {
    if (!path_str.empty()) {
#if defined(OS_WIN)
      path_str.push_back(';');
#else
      path_str.push_back(':');
#endif
    }
    path_str += path.value();
  }

  (*map)[kPythonPathEnv] = path_str;

  // vpython has instructions on BuildBot (not swarming or LUCI) to clear
  // PYTHONPATH on invocation. Since we are clearing and manipulating it
  // ourselves, we don't want vpython to throw out our hard work.
  (*map)[kVPythonClearPathEnv] = base::NativeEnvironmentString();
}

bool GetPyProtoPath(base::FilePath* dir) {
  // Locate the Python code generated by the protocol buffers compiler.
  base::FilePath generated_code_dir;
  if (!base::PathService::Get(base::DIR_EXE, &generated_code_dir)) {
    LOG(ERROR) << "Can't find " << generated_code_dir.value();
    return false;
  }

#if defined(OS_MACOSX)
  if (base::mac::AmIBundled())
    generated_code_dir = generated_code_dir.DirName().DirName().DirName();
#endif

  // Used for GYP. TODO(jam): remove after GN conversion.
  const base::FilePath kPyProto(FILE_PATH_LITERAL("pyproto"));
  if (base::DirectoryExists(generated_code_dir.Append(kPyProto))) {
    *dir = generated_code_dir.Append(kPyProto);
    return true;
  }

  // Used for GN.
  const base::FilePath kGen(FILE_PATH_LITERAL("gen"));
  if (base::DirectoryExists(generated_code_dir.Append(kGen))) {
    *dir = generated_code_dir.Append(kGen);
    return true;
  }

  return false;
}

bool GetPythonCommand(base::CommandLine* python_cmd) {
  DCHECK(python_cmd);

// Use vpython to pick up src.git's vpython VirtualEnv spec.
#if defined(OS_WIN)
  python_cmd->SetProgram(base::FilePath(FILE_PATH_LITERAL("vpython.bat")));
#else
  python_cmd->SetProgram(base::FilePath(FILE_PATH_LITERAL("vpython")));
#endif

  // Launch python in unbuffered mode, so that python output doesn't mix with
  // gtest output in buildbot log files. See http://crbug.com/147368.
  python_cmd->AppendArg("-u");

  return true;
}