// Copyright 2008, Google Inc.
// All rights reserved.
//
// 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.

#include "chrome/app/client_util.h"

#include <shlobj.h>

namespace client_util {
const wchar_t kProductVersionKey[] = L"pv";

bool FileExists(const wchar_t* const file_path) {
  WIN32_FILE_ATTRIBUTE_DATA attrs;
  return ::GetFileAttributesEx(file_path, GetFileExInfoStandard, &attrs) != 0;
}

bool GetChromiumVersion(const wchar_t* const exe_path,
                        const wchar_t* const reg_key_path,
                        wchar_t** version) {
  HKEY reg_root = IsUserModeInstall(exe_path) ? HKEY_CURRENT_USER :
                                                HKEY_LOCAL_MACHINE;
  HKEY reg_key;
  if (::RegOpenKeyEx(reg_root, reg_key_path, 0,
                     KEY_READ, &reg_key) != ERROR_SUCCESS) {
    return false;
  }
  DWORD size = 0;
  bool ret = false;
  if (::RegQueryValueEx(reg_key, client_util::kProductVersionKey, NULL, NULL,
                        NULL, &size) == ERROR_SUCCESS) {
    *version = new wchar_t[1 + (size / sizeof(wchar_t))];
    if (::RegQueryValueEx(reg_key, client_util::kProductVersionKey,
                          NULL, NULL, reinterpret_cast<BYTE*>(*version),
                          &size) == ERROR_SUCCESS) {
      ret = true;
    } else {
      delete[] *version;
    }
  }
  ::RegCloseKey(reg_key);
  return ret;
}

void GetExecutablePath(wchar_t* exe_path) {
  DWORD len = ::GetModuleFileName(NULL, exe_path, MAX_PATH);
  wchar_t* tmp = exe_path + len - 1;
  while (tmp >= exe_path && *tmp != L'\\')
    tmp--;
  if (tmp > exe_path) {
    tmp++;
    *tmp = 0;
  }
}

bool IsUserModeInstall(const wchar_t* const exe_path) {
  wchar_t buffer[MAX_PATH] = {0};
  if (!FAILED(SHGetFolderPath(NULL, CSIDL_PROGRAM_FILES, NULL,
                              SHGFP_TYPE_CURRENT, buffer))) {
    if (exe_path == wcsstr(exe_path, buffer)) {
      return false;
    }
  }
  return true;
}
}  // namespace client_util