// 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 COMPONENTS_HTML_VIEWER_HTML_DOCUMENT_OOPIF_H_
#define COMPONENTS_HTML_VIEWER_HTML_DOCUMENT_OOPIF_H_

#include <set>

#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "components/html_viewer/ax_provider_impl.h"
#include "components/html_viewer/html_frame_delegate.h"
#include "components/html_viewer/public/interfaces/test_html_viewer.mojom.h"
#include "components/view_manager/public/cpp/view_manager_client_factory.h"
#include "components/view_manager/public/cpp/view_manager_delegate.h"
#include "components/view_manager/public/cpp/view_observer.h"
#include "mandoline/tab/public/interfaces/frame_tree.mojom.h"
#include "mojo/application/public/cpp/app_lifetime_helper.h"
#include "mojo/application/public/cpp/interface_factory.h"
#include "mojo/application/public/cpp/service_provider_impl.h"
#include "mojo/application/public/interfaces/application.mojom.h"
#include "mojo/services/network/public/interfaces/url_loader.mojom.h"

namespace base {
class SingleThreadTaskRunner;
}

namespace mojo {
class ViewManager;
class View;
}

namespace html_viewer {

class AxProviderImpl;
class DevToolsAgentImpl;
class DocumentResourceWaiter;
class GlobalState;
class HTMLFrameTreeManager;
class TestHTMLViewerImpl;
class WebLayerTreeViewImpl;

// A view for a single HTML document.
//
// HTMLDocument is deleted in one of two ways:
// . When the View the HTMLDocument is embedded in is destroyed.
// . Explicitly by way of Destroy().
class HTMLDocumentOOPIF
    : public mojo::ViewManagerDelegate,
      public mojo::ViewObserver,
      public HTMLFrameDelegate,
      public mojo::InterfaceFactory<mojo::AxProvider>,
      public mojo::InterfaceFactory<mandoline::FrameTreeClient>,
      public mojo::InterfaceFactory<TestHTMLViewer> {
 public:
  using DeleteCallback = base::Callback<void(HTMLDocumentOOPIF*)>;
  using HTMLFrameCreationCallback =
      base::Callback<HTMLFrame*(HTMLFrame::CreateParams*)>;

  // Load a new HTMLDocument with |response|.
  // |html_document_app| is the application this app was created in, and
  // |connection| the specific connection triggering this new instance.
  // |setup| is used to obtain init type state (such as resources).
  HTMLDocumentOOPIF(mojo::ApplicationImpl* html_document_app,
                    mojo::ApplicationConnection* connection,
                    mojo::URLResponsePtr response,
                    GlobalState* setup,
                    const DeleteCallback& delete_callback,
                    const HTMLFrameCreationCallback& frame_creation_callback);

  // Deletes this object.
  void Destroy();

 private:
  friend class DocumentResourceWaiter;  // So it can call LoadIfNecessary().

  // Requests for interfaces before the document is loaded go here. Once
  // loaded the requests are bound and BeforeLoadCache is deleted.
  struct BeforeLoadCache {
    BeforeLoadCache();
    ~BeforeLoadCache();

    std::set<mojo::InterfaceRequest<mojo::AxProvider>*> ax_provider_requests;
    std::set<mojo::InterfaceRequest<TestHTMLViewer>*> test_interface_requests;
  };

  ~HTMLDocumentOOPIF() override;

  void LoadIfNecessary();
  void Load();

  BeforeLoadCache* GetBeforeLoadCache();

  // ViewManagerDelegate:
  void OnEmbed(mojo::View* root) override;
  void OnUnembed() override;
  void OnViewManagerDestroyed(mojo::ViewManager* view_manager) override;

  // ViewObserver:
  void OnViewViewportMetricsChanged(
      mojo::View* view,
      const mojo::ViewportMetrics& old_metrics,
      const mojo::ViewportMetrics& new_metrics) override;
  void OnViewDestroyed(mojo::View* view) override;

  // HTMLFrameDelegate:
  bool ShouldNavigateLocallyInMainFrame() override;
  void OnFrameDidFinishLoad() override;
  mojo::ApplicationImpl* GetApp() override;
  HTMLFrame* CreateHTMLFrame(HTMLFrame::CreateParams* params) override;

  // mojo::InterfaceFactory<mojo::AxProvider>:
  void Create(mojo::ApplicationConnection* connection,
              mojo::InterfaceRequest<mojo::AxProvider> request) override;

  // mojo::InterfaceFactory<mandoline::FrameTreeClient>:
  void Create(
      mojo::ApplicationConnection* connection,
      mojo::InterfaceRequest<mandoline::FrameTreeClient> request) override;

  // mojo::InterfaceFactory<TestHTMLViewer>:
  void Create(mojo::ApplicationConnection* connection,
              mojo::InterfaceRequest<TestHTMLViewer> request) override;

  scoped_ptr<mojo::AppRefCount> app_refcount_;
  mojo::ApplicationImpl* html_document_app_;
  mojo::ApplicationConnection* connection_;
  mojo::ViewManagerClientFactory view_manager_client_factory_;

  // HTMLDocument owns these pointers; binding requests after document load.
  std::set<AxProviderImpl*> ax_providers_;

  ScopedVector<TestHTMLViewerImpl> test_html_viewers_;

  // Set to true when the local frame has finished loading.
  bool did_finish_local_frame_load_ = false;

  GlobalState* global_state_;

  HTMLFrame* frame_;

  scoped_ptr<DevToolsAgentImpl> devtools_agent_;

  scoped_ptr<DocumentResourceWaiter> resource_waiter_;

  scoped_ptr<BeforeLoadCache> before_load_cache_;

  DeleteCallback delete_callback_;

  HTMLFrameCreationCallback frame_creation_callback_;

  DISALLOW_COPY_AND_ASSIGN(HTMLDocumentOOPIF);
};

}  // namespace html_viewer

#endif  // COMPONENTS_HTML_VIEWER_HTML_DOCUMENT_OOPIF_H_