// 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 "content/public/browser/browser_main_runner.h"

#include "base/allocator/allocator_shim.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/notification_service_impl.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "ui/base/ime/input_method_initializer.h"

#if defined(OS_WIN)
#include "base/win/metro.h"
#include "base/win/windows_version.h"
#include "ui/base/win/scoped_ole_initializer.h"
#endif

bool g_exited_main_message_loop = false;

namespace content {

class BrowserMainRunnerImpl : public BrowserMainRunner {
 public:
  BrowserMainRunnerImpl() : is_initialized_(false), is_shutdown_(false) {}

  virtual ~BrowserMainRunnerImpl() {
    if (is_initialized_ && !is_shutdown_)
      Shutdown();
  }

  virtual int Initialize(const MainFunctionParams& parameters)
      OVERRIDE {
    TRACE_EVENT0("startup", "BrowserMainRunnerImpl::Initialize")
    is_initialized_ = true;

#if !defined(OS_IOS)
  if (parameters.command_line.HasSwitch(switches::kWaitForDebugger))
    base::debug::WaitForDebugger(60, true);
#endif

#if defined(OS_WIN)
    if (parameters.command_line.HasSwitch(
            switches::kEnableTextServicesFramework)) {
      base::win::SetForceToUseTSF();
    } else if (base::win::GetVersion() < base::win::VERSION_VISTA) {
      // When "Extend support of advanced text services to all programs"
      // (a.k.a. Cicero Unaware Application Support; CUAS) is enabled on
      // Windows XP and handwriting modules shipped with Office 2003 are
      // installed, "penjpn.dll" and "skchui.dll" will be loaded and then crash
      // unless a user installs Office 2003 SP3. To prevent these modules from
      // being loaded, disable TSF entirely. crbug/160914.
      // TODO(yukawa): Add a high-level wrapper for this instead of calling
      // Win32 API here directly.
      ImmDisableTextFrameService(static_cast<DWORD>(-1));
    }
#endif  // OS_WIN

    base::StatisticsRecorder::Initialize();

    notification_service_.reset(new NotificationServiceImpl);

#if defined(OS_WIN)
    // Ole must be initialized before starting message pump, so that TSF
    // (Text Services Framework) module can interact with the message pump
    // on Windows 8 Metro mode.
    ole_initializer_.reset(new ui::ScopedOleInitializer);
#endif  // OS_WIN

    main_loop_.reset(new BrowserMainLoop(parameters));

    main_loop_->Init();

    main_loop_->EarlyInitialization();

    // Must happen before we try to use a message loop or display any UI.
    main_loop_->InitializeToolkit();

    main_loop_->MainMessageLoopStart();

    // WARNING: If we get a WM_ENDSESSION, objects created on the stack here
    // are NOT deleted. If you need something to run during WM_ENDSESSION add it
    // to browser_shutdown::Shutdown or BrowserProcess::EndSession.

#if defined(OS_WIN) && !defined(NO_TCMALLOC)
    // When linking shared libraries, NO_TCMALLOC is defined, and dynamic
    // allocator selection is not supported.

    // Make this call before going multithreaded, or spawning any subprocesses.
    base::allocator::SetupSubprocessAllocator();
#endif
    ui::InitializeInputMethod();

    main_loop_->CreateStartupTasks();
    int result_code = main_loop_->GetResultCode();
    if (result_code > 0)
      return result_code;

    // Return -1 to indicate no early termination.
    return -1;
  }

  virtual int Run() OVERRIDE {
    DCHECK(is_initialized_);
    DCHECK(!is_shutdown_);
    main_loop_->RunMainMessageLoopParts();
    return main_loop_->GetResultCode();
  }

  virtual void Shutdown() OVERRIDE {
    DCHECK(is_initialized_);
    DCHECK(!is_shutdown_);
    g_exited_main_message_loop = true;

    main_loop_->ShutdownThreadsAndCleanUp();

    ui::ShutdownInputMethod();
#if defined(OS_WIN)
    ole_initializer_.reset(NULL);
#endif

    main_loop_.reset(NULL);

    notification_service_.reset(NULL);

    is_shutdown_ = true;
  }

 protected:
  // True if the runner has been initialized.
  bool is_initialized_;

  // True if the runner has been shut down.
  bool is_shutdown_;

  scoped_ptr<NotificationServiceImpl> notification_service_;
  scoped_ptr<BrowserMainLoop> main_loop_;
#if defined(OS_WIN)
  scoped_ptr<ui::ScopedOleInitializer> ole_initializer_;
#endif

  DISALLOW_COPY_AND_ASSIGN(BrowserMainRunnerImpl);
};

// static
BrowserMainRunner* BrowserMainRunner::Create() {
  return new BrowserMainRunnerImpl();
}

}  // namespace content