// Copyright 2015 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 "ui/gfx/win/direct_manipulation.h"

#include "base/basictypes.h"
#include "base/win/windows_version.h"

namespace gfx {
namespace win {

// static
scoped_ptr<DirectManipulationHelper>
DirectManipulationHelper::CreateInstance() {
  scoped_ptr<DirectManipulationHelper> instance;

  if (base::win::GetVersion() >= base::win::VERSION_WIN10)
    instance.reset(new DirectManipulationHelper);

  return instance;
}

DirectManipulationHelper::DirectManipulationHelper() {}

DirectManipulationHelper::~DirectManipulationHelper() {}

void DirectManipulationHelper::Initialize(HWND window) {
  DCHECK(::IsWindow(window));

  // TODO(ananta)
  // Remove the CHECK statements here and below and replace them with logs
  // when this code stabilizes.
  HRESULT hr = manager_.CreateInstance(CLSID_DirectManipulationManager,
    nullptr, CLSCTX_INPROC_SERVER);
  CHECK(SUCCEEDED(hr));

  hr = compositor_.CreateInstance(CLSID_DCompManipulationCompositor,
      nullptr, CLSCTX_INPROC_SERVER);
  CHECK(SUCCEEDED(hr));

  hr = manager_->GetUpdateManager(IID_PPV_ARGS(update_manager_.Receive()));
  CHECK(SUCCEEDED(hr));

  hr = compositor_->SetUpdateManager(update_manager_.get());
  CHECK(SUCCEEDED(hr));

  hr = frame_info_.QueryFrom(compositor_.get());
  CHECK(SUCCEEDED(hr));

  hr = manager_->CreateViewport(frame_info_.get(), window,
      IID_PPV_ARGS(view_port_outer_.Receive()));
  CHECK(SUCCEEDED(hr));

  //
  // Enable the desired configuration for each viewport.
  //
  DIRECTMANIPULATION_CONFIGURATION configuration =
      DIRECTMANIPULATION_CONFIGURATION_INTERACTION
      | DIRECTMANIPULATION_CONFIGURATION_TRANSLATION_X
      | DIRECTMANIPULATION_CONFIGURATION_TRANSLATION_Y
      | DIRECTMANIPULATION_CONFIGURATION_TRANSLATION_INERTIA
      | DIRECTMANIPULATION_CONFIGURATION_RAILS_X
      | DIRECTMANIPULATION_CONFIGURATION_RAILS_Y
      | DIRECTMANIPULATION_CONFIGURATION_SCALING
      | DIRECTMANIPULATION_CONFIGURATION_SCALING_INERTIA;

  hr = view_port_outer_->ActivateConfiguration(configuration);
  CHECK(SUCCEEDED(hr));
}

void DirectManipulationHelper::SetBounds(const gfx::Rect& bounds) {
  base::win::ScopedComPtr<IDirectManipulationPrimaryContent>
      primary_content_outer;
  HRESULT hr = view_port_outer_->GetPrimaryContent(
      IID_PPV_ARGS(primary_content_outer.Receive()));
  CHECK(SUCCEEDED(hr));

  base::win::ScopedComPtr<IDirectManipulationContent> content_outer;
  hr = content_outer.QueryFrom(primary_content_outer.get());
  CHECK(SUCCEEDED(hr));

  RECT rect = bounds.ToRECT();

  hr = view_port_outer_->SetViewportRect(&rect);
  CHECK(SUCCEEDED(hr));

  hr = content_outer->SetContentRect(&rect);
  CHECK(SUCCEEDED(hr));
}

void DirectManipulationHelper::Activate(HWND window) {
  DCHECK(::IsWindow(window));
  manager_->Activate(window);
}

void DirectManipulationHelper::Deactivate(HWND window) {
  DCHECK(::IsWindow(window));
  manager_->Deactivate(window);
}

void DirectManipulationHelper:: HandleMouseWheel(HWND window, UINT message,
    WPARAM w_param, LPARAM l_param) {
  MSG msg = { window, message, w_param, l_param};

  HRESULT hr = view_port_outer_->SetContact(DIRECTMANIPULATION_MOUSEFOCUS);
  if (SUCCEEDED(hr)) {
    BOOL handled = FALSE;
    manager_->ProcessInput(&msg, &handled);
    view_port_outer_->ReleaseContact(DIRECTMANIPULATION_MOUSEFOCUS);
  }
}

}  // namespace win.
}  // namespace gfx.