// Copyright (c) 2012 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 "chrome/updater/win/installer/configuration.h"
#include <shellapi.h>
#include "chrome/updater/win/installer/string.h"

namespace updater {

namespace {

// Returns true if GoogleUpdateIsMachine=1 is present in the environment.
bool GetGoogleUpdateIsMachineEnvVar() {
  constexpr DWORD kBufferSize = 2;
  StackString<kBufferSize> value;
  const auto length = ::GetEnvironmentVariableW(L"GoogleUpdateIsMachine",
                                                value.get(), kBufferSize);
  return length == 1 && *value.get() == L'1';
}

}  // namespace

Configuration::Configuration() {
  Clear();
}

Configuration::~Configuration() {
  Clear();
}

bool Configuration::Initialize(HMODULE module) {
  Clear();
  return ParseCommandLine(::GetCommandLine());
}

void Configuration::Clear() {
  if (args_ != nullptr) {
    ::LocalFree(args_);
    args_ = nullptr;
  }
  command_line_ = nullptr;
  operation_ = INSTALL_PRODUCT;
  argument_count_ = 0;
  is_system_level_ = false;
  has_invalid_switch_ = false;
}

// |command_line| is shared with this instance in the sense that this
// instance may refer to it at will throughout its lifetime, yet it will
// not release it.
bool Configuration::ParseCommandLine(const wchar_t* command_line) {
  command_line_ = command_line;
  args_ = ::CommandLineToArgvW(command_line_, &argument_count_);
  if (!args_)
    return false;

  for (int i = 1; i < argument_count_; ++i) {
    if (0 == ::lstrcmpi(args_[i], L"--system-level"))
      is_system_level_ = true;
    else if (0 == ::lstrcmpi(args_[i], L"--cleanup"))
      operation_ = CLEANUP;
  }

  if (!is_system_level_)
    is_system_level_ = GetGoogleUpdateIsMachineEnvVar();

  return true;
}

}  // namespace updater