// Copyright 2014 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.

#ifndef MOJO_SERVICES_WINDOW_MANAGER_WINDOW_MANAGER_APP_H_
#define MOJO_SERVICES_WINDOW_MANAGER_WINDOW_MANAGER_APP_H_

#include <set>

#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "mojo/aura/window_tree_host_mojo.h"
#include "mojo/public/cpp/application/application_delegate.h"
#include "mojo/public/cpp/application/interface_factory_impl.h"
#include "mojo/public/cpp/bindings/string.h"
#include "mojo/services/public/cpp/view_manager/types.h"
#include "mojo/services/public/cpp/view_manager/view_manager_client_factory.h"
#include "mojo/services/public/cpp/view_manager/view_manager_delegate.h"
#include "mojo/services/public/cpp/view_manager/view_observer.h"
#include "mojo/services/window_manager/window_manager_impl.h"
#include "mojo/services/window_manager/window_manager_internal_service_impl.h"
#include "mojo/services/window_manager/window_manager_service2_impl.h"
#include "ui/aura/client/focus_change_observer.h"
#include "ui/events/event_handler.h"
#include "ui/wm/public/activation_change_observer.h"

namespace aura {
namespace client {
class ActivationClient;
class FocusClient;
}
class Window;
}

namespace wm {
class FocusRules;
class ScopedCaptureClient;
}

namespace mojo {

class AuraInit;
class DummyDelegate;
class WindowManagerClient;
class WindowManagerDelegate;
class WindowManagerService2Impl;

// Implements core window manager functionality that could conceivably be shared
// across multiple window managers implementing superficially different user
// experiences. Establishes communication with the view manager.
// A window manager wishing to use this core should create and own an instance
// of this object. They may implement the associated ViewManager/WindowManager
// delegate interfaces exposed by the view manager, this object provides the
// canonical implementation of said interfaces but will call out to the wrapped
// instances.
// This object maintains an aura::WindowTreeHost containing a hierarchy of
// aura::Windows. Window manager functionality (e.g. focus, activation,
// modality, etc.) are implemented using aura core window manager components.
class WindowManagerApp
    : public ApplicationDelegate,
      public ViewManagerDelegate,
      public ViewObserver,
      public ui::EventHandler,
      public aura::client::FocusChangeObserver,
      public aura::client::ActivationChangeObserver {
 public:
  WindowManagerApp(ViewManagerDelegate* view_manager_delegate,
                   WindowManagerDelegate* window_manager_delegate);
  ~WindowManagerApp() override;

  static View* GetViewForWindow(aura::Window* window);
  aura::Window* GetWindowForViewId(Id view);

  // Register/deregister new connections to the window manager service.
  void AddConnection(WindowManagerService2Impl* connection);
  void RemoveConnection(WindowManagerService2Impl* connection);

  // These are canonical implementations of the window manager API methods.
  void SetCapture(Id view);
  void FocusWindow(Id view);
  void ActivateWindow(Id view);

  bool IsReady() const;

  // A client of this object will use this accessor to gain access to the
  // aura::Window hierarchy and attach event handlers.
  WindowTreeHostMojo* host() { return window_tree_host_.get(); }

  void InitFocus(wm::FocusRules* rules);

  void set_window_manager_client(WindowManagerInternalClient* client) {
    window_manager_client_ = client;
  }

  // WindowManagerImpl::Embed() forwards to this. If connected to ViewManager
  // then forwards to delegate, otherwise waits for connection to establish then
  // forwards.
  void Embed(const String& url,
             InterfaceRequest<ServiceProvider> service_provider);

  // Overridden from ApplicationDelegate:
  void Initialize(ApplicationImpl* impl) override;
  bool ConfigureIncomingConnection(ApplicationConnection* connection) override;

 private:
  typedef std::set<WindowManagerService2Impl*> Connections;
  typedef std::map<Id, aura::Window*> ViewIdToWindowMap;

  struct PendingEmbed;

  // Overridden from ViewManagerDelegate:
  void OnEmbed(ViewManager* view_manager,
               View* root,
               ServiceProviderImpl* exported_services,
               scoped_ptr<ServiceProvider> imported_services) override;
  void OnViewManagerDisconnected(ViewManager* view_manager) override;

  // Overridden from ViewObserver:
  void OnTreeChanged(const ViewObserver::TreeChangeParams& params) override;
  void OnViewDestroying(View* view) override;
  void OnViewBoundsChanged(View* view,
                           const Rect& old_bounds,
                           const Rect& new_bounds) override;

  // Overridden from ui::EventHandler:
  void OnEvent(ui::Event* event) override;

  // Overridden from aura::client::FocusChangeObserver:
  void OnWindowFocused(aura::Window* gained_focus,
                       aura::Window* lost_focus) override;

  // Overridden from aura::client::ActivationChangeObserver:
  void OnWindowActivated(aura::Window* gained_active,
                         aura::Window* lost_active) override;

  // Creates an aura::Window for every view in the hierarchy beneath |view|,
  // and adds to the registry so that it can be retrieved later via
  // GetWindowForViewId().
  // TODO(beng): perhaps View should have a property bag.
  void RegisterSubtree(View* view, aura::Window* parent);
  // Recursively invokes Unregister() for |view| and all its descendants.
  void UnregisterSubtree(View* view);
  // Deletes the aura::Windows associated with the hierarchy beneath |id|,
  // and removes from the registry.
  void Unregister(View* view);

  // Creates the connection to the ViewManager.
  void LaunchViewManager(ApplicationImpl* app);

  Shell* shell_;

  InterfaceFactoryImplWithContext<WindowManagerService2Impl, WindowManagerApp>
      window_manager_service2_factory_;

  InterfaceFactoryImplWithContext<WindowManagerImpl, WindowManagerApp>
      window_manager_factory_;

  InterfaceFactoryImplWithContext<WindowManagerInternalServiceImpl,
                                  WindowManagerApp>
      window_manager_internal_service_factory_;

  ViewManagerDelegate* wrapped_view_manager_delegate_;
  WindowManagerDelegate* window_manager_delegate_;

  ViewManager* view_manager_;
  scoped_ptr<ViewManagerClientFactory> view_manager_client_factory_;
  View* root_;

  scoped_ptr<AuraInit> aura_init_;
  scoped_ptr<WindowTreeHostMojo> window_tree_host_;

  scoped_ptr<wm::ScopedCaptureClient> capture_client_;
  scoped_ptr<aura::client::FocusClient> focus_client_;
  aura::client::ActivationClient* activation_client_;

  Connections connections_;
  ViewIdToWindowMap view_id_to_window_map_;

  scoped_ptr<DummyDelegate> dummy_delegate_;

  WindowManagerInternalClient* window_manager_client_;

  ScopedVector<PendingEmbed> pending_embeds_;

  scoped_ptr<ViewManagerClient> view_manager_client_;

  DISALLOW_COPY_AND_ASSIGN(WindowManagerApp);
};

}  // namespace mojo

#endif  // MOJO_SERVICES_WINDOW_MANAGER_WINDOW_MANAGER_APP_H_