// Copyright 2018 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 <windows.h>

#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/persistent_histogram_storage.h"
#include "base/process/memory.h"
#include "base/timer/elapsed_timer.h"
#include "base/win/process_startup_helper.h"
#include "base/win/scoped_winrt_initializer.h"
#include "chrome/install_static/product_install_details.h"
#include "chrome/install_static/user_data_dir.h"
#include "notification_helper/com_server_module.h"
#include "notification_helper/notification_helper_crash_reporter_client.h"
#include "notification_helper/notification_helper_util.h"
#include "notification_helper/trace_util.h"

extern "C" int WINAPI wWinMain(HINSTANCE instance,
                               HINSTANCE prev_instance,
                               wchar_t* command_line,
                               int show_command) {
  // Persist histograms so they can be uploaded later.
  // The allocator name must be kept in sync with the writer in
  // chrome/browser/metrics/chrome_metrics_service_client.cc.
  base::PersistentHistogramStorage persistent_histogram_storage(
      "NotificationHelperMetrics",
      base::PersistentHistogramStorage::StorageDirManagement::kCreate);

  // Initialize the CommandLine singleton from the environment.
  base::CommandLine::Init(0, nullptr);

  // This process is designed to be launched by COM only, which appends the
  // "-Embedding" flag to the command line. If this flag is not found, the
  // process should exit immediately.
  // https://msdn.microsoft.com/en-us/library/windows/desktop/ms683844.aspx
  if (!base::CommandLine::ForCurrentProcess()->HasSwitch("embedding")) {
    // Histogram storage is enabled at the very top of this wWinMain. Disable it
    // in this case as there is no directory in which to write them nor a
    // browser to subsequently upload them.
    persistent_histogram_storage.Disable();
    return 0;
  }

  // The exit manager is in charge of calling the dtors of singletons.
  base::AtExitManager exit_manager;

  install_static::InitializeProductDetailsForPrimaryModule();

  // Use crashpad embedded in chrome.exe as the crash handler.
  base::FilePath chrome_exe_path = notification_helper::GetChromeExePath();
  if (!chrome_exe_path.empty()) {
    NotificationHelperCrashReporterClient::
        InitializeCrashReportingForProcessWithHandler(chrome_exe_path);
  }

  // The histogram storage folder should be under folder "User Data".
  base::string16 user_data_dir;
  install_static::GetUserDataDirectory(&user_data_dir, nullptr);

  persistent_histogram_storage.set_storage_base_dir(
      base::FilePath(std::move(user_data_dir)));

  // Make sure the process exits cleanly on unexpected errors.
  base::EnableTerminationOnHeapCorruption();
  base::EnableTerminationOnOutOfMemory();
  base::win::RegisterInvalidParamHandler();
  base::win::SetupCRT(*base::CommandLine::ForCurrentProcess());

  base::win::ScopedWinrtInitializer winrt_initializer;
  if (!winrt_initializer.Succeeded()) {
    Trace(L"Failed initializing WinRT\n");
    return -1;
  }

  base::ElapsedTimer run_timer;

  notification_helper::ComServerModule com_server_module;
  com_server_module.Run();

  base::UmaHistogramMediumTimes(
      "Notifications.NotificationHelper.ServerRuntime", run_timer.Elapsed());

  return 0;
}