// 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.

#include "examples/wm_flow/wm/frame_controller.h"
#include "mojo/application/application_runner_chromium.h"
#include "mojo/public/c/system/main.h"
#include "mojo/public/cpp/application/application_delegate.h"
#include "mojo/public/cpp/application/application_impl.h"
#include "mojo/public/cpp/application/service_provider_impl.h"
#include "mojo/services/input_events/public/interfaces/input_events.mojom.h"
#include "mojo/services/view_manager/public/cpp/view_manager.h"
#include "mojo/services/view_manager/public/cpp/view_manager_delegate.h"
#include "mojo/services/view_manager/public/cpp/view_observer.h"
#include "services/window_manager/basic_focus_rules.h"
#include "services/window_manager/window_manager_app.h"
#include "services/window_manager/window_manager_delegate.h"
#include "services/window_manager/window_manager_root.h"
#include "url/gurl.h"

namespace examples {

// TODO(johngro) : investigate extending mojom with a formal flags type which it
// generates good bindings for, so we don't need to resort to this.
static inline constexpr bool operator &(const mojo::EventFlags& f1,
                                        const mojo::EventFlags& f2) {
  return ((static_cast<uint32_t>(f1) & static_cast<uint32_t>(f2)) != 0);
}

class SimpleWMController : public window_manager::WindowManagerController,
                           public mojo::ViewObserver {
 public:
  SimpleWMController(window_manager::WindowManagerRoot* wm_root)
      : window_manager_root_(wm_root),
        root_(NULL),
        window_container_(NULL),
        next_window_origin_(10, 10) {}
  ~SimpleWMController() override {}

 private:
  // Overridden from mojo::ViewManagerDelegate:
  void OnEmbed(mojo::View* root,
               mojo::InterfaceRequest<mojo::ServiceProvider> services,
               mojo::ServiceProviderPtr exposed_services) override {
    root_ = root;

    window_container_ = root->view_manager()->CreateView();
    window_container_->SetBounds(root_->bounds());
    root_->AddChild(window_container_);
    window_container_->SetVisible(true);

    window_manager_root_->InitFocus(make_scoped_ptr(
        new window_manager::BasicFocusRules(window_container_)));
  }
  void OnViewManagerDisconnected(mojo::ViewManager* view_manager) override {
    root_ = NULL;
  }

  // Overridden from mojo::WindowManagerDelegate:
  void Embed(const mojo::String& url,
             mojo::InterfaceRequest<mojo::ServiceProvider> services,
             mojo::ServiceProviderPtr exposed_services) override {
    DCHECK(root_);
    mojo::View* app_view = NULL;
    CreateTopLevelWindow(&app_view);
    app_view->Embed(url, services.Pass(), exposed_services.Pass());
  }

  // Overridden from mojo::ViewObserver:
  void OnViewInputEvent(mojo::View* view,
                        const mojo::EventPtr& event) override {
    if (event->action == mojo::EventType::POINTER_UP &&
        event->flags & mojo::EventFlags::RIGHT_MOUSE_BUTTON &&
        view->parent() == window_container_) {
      CloseWindow(view);
    }
  }
  void OnViewDestroyed(mojo::View* view) override {
    view->RemoveObserver(this);
  }

  void CloseWindow(mojo::View* view) {
    mojo::View* first_child = view->children().front();
    first_child->Destroy();
    view->Destroy();
    next_window_origin_.Offset(-50, -50);
  }

  mojo::View* CreateTopLevelWindow(mojo::View** app_view) {
    mojo::View* frame_view = root_->view_manager()->CreateView();
    // Add the View to it's parent before showing so that animations can happen.
    window_container_->AddChild(frame_view);
    mojo::Rect rect;
    rect.x = next_window_origin_.x();
    rect.y = next_window_origin_.y();
    rect.width = rect.height = 400;
    frame_view->SetBounds(rect);
    next_window_origin_.Offset(50, 50);

    GURL frame_url = url_.Resolve("/examples/wm_flow/wm/window_frame.sky");
    new FrameController(frame_url, frame_view, app_view, window_manager_root_);
    return frame_view;
  }

  window_manager::WindowManagerRoot* window_manager_root_;

  GURL url_;
  mojo::View* root_;
  mojo::View* window_container_;

  gfx::Point next_window_origin_;

  DISALLOW_COPY_AND_ASSIGN(SimpleWMController);
};

class SimpleWM : public mojo::ApplicationDelegate,
                 public window_manager::WindowManagerControllerFactory {
 public:
  SimpleWM()
      : window_manager_app_(new window_manager::WindowManagerApp(this)) {}

 protected:
  ~SimpleWM() override {}

 private:
  // Overridden from mojo::ApplicationDelegate:
  void Initialize(mojo::ApplicationImpl* impl) override {
    // FIXME: Mojo applications don't know their URLs yet:
    // https://docs.google.com/a/chromium.org/document/d/1AQ2y6ekzvbdaMF5WrUQmneyXJnke-MnYYL4Gz1AKDos
    url_ = GURL(impl->args()[1]);
    window_manager_app_->Initialize(impl);
  }

  bool ConfigureIncomingConnection(
      mojo::ApplicationConnection* connection) override {
    window_manager_app_->ConfigureIncomingConnection(connection);
    return true;
  }

  scoped_ptr<window_manager::WindowManagerController>
  CreateWindowManagerController(
      mojo::ApplicationConnection* connection,
      window_manager::WindowManagerRoot* wm_root) override {
    return scoped_ptr<window_manager::WindowManagerController>(
        new SimpleWMController(wm_root));
  }

  scoped_ptr<window_manager::WindowManagerApp> window_manager_app_;
  GURL url_;

  DISALLOW_COPY_AND_ASSIGN(SimpleWM);
};

}  // namespace examples

MojoResult MojoMain(MojoHandle application_request) {
  mojo::ApplicationRunnerChromium runner(new examples::SimpleWM);
  return runner.Run(application_request);
}