// 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.

#ifndef CONTENT_PUBLIC_RENDERER_RENDERER_PPAPI_HOST_H_
#define CONTENT_PUBLIC_RENDERER_RENDERER_PPAPI_HOST_H_

#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/platform_file.h"
#include "base/process/process.h"
#include "content/common/content_export.h"
#include "ipc/ipc_platform_file.h"
#include "ppapi/c/pp_instance.h"

namespace base {
class FilePath;
}

namespace gfx {
class Point;
}

namespace IPC {
class Message;
}

namespace ppapi {
namespace host {
class PpapiHost;
}
}

namespace WebKit {
class WebPluginContainer;
}

namespace content {
class PepperPluginInstance;
class RenderView;

// Interface that allows components in the embedder app to talk to the
// PpapiHost in the renderer process.
//
// There will be one of these objects in the renderer per plugin module.
class RendererPpapiHost {
 public:
  // Returns the RendererPpapiHost associated with the given PP_Instance,
  // or NULL if the instance is invalid.
  //
  // Do NOT use this when dealing with the "NaCl trusted plugin". That plugin
  // and the "untrusted plugin" (the NaCl application) that will be loaded
  // share a PP_Instance, and the RendererPpapiHost* for the "untrusted plugin"
  // will be returned after we switch the proxy on.
  CONTENT_EXPORT static RendererPpapiHost* GetForPPInstance(
      PP_Instance instance);

  // Returns the PpapiHost object.
  virtual ppapi::host::PpapiHost* GetPpapiHost() = 0;

  // Returns true if the given PP_Instance is valid and belongs to the
  // plugin associated with this host.
  virtual bool IsValidInstance(PP_Instance instance) const = 0;

  // Returns the PluginInstance for the given PP_Instance, or NULL if the
  // PP_Instance is invalid (the common case this will be invalid is during
  // plugin teardown when resource hosts are being force-freed).
  virtual PepperPluginInstance* GetPluginInstance(
      PP_Instance instance) const = 0;

  // Returns the RenderView for the given plugin instance, or NULL if the
  // instance is invalid.
  virtual RenderView* GetRenderViewForInstance(PP_Instance instance) const = 0;

  // Returns the WebPluginContainer for the given plugin instance, or NULL if
  // the instance is invalid.
  virtual WebKit::WebPluginContainer* GetContainerForInstance(
      PP_Instance instance) const = 0;

  // Returns the PID of the child process containing the plugin. If running
  // in-process, this returns base::kNullProcessId.
  virtual base::ProcessId GetPluginPID() const = 0;

  // Returns true if the given instance is considered to be currently
  // processing a user gesture or the plugin module has the "override user
  // gesture" flag set (in which case it can always do things normally
  // restricted by user gestures). Returns false if the instance is invalid or
  // if there is no current user gesture.
  virtual bool HasUserGesture(PP_Instance instance) const = 0;

  // Returns the routing ID for the render widget containing the given
  // instance. This will take into account the current Flash fullscreen state,
  // so if there is a Flash fullscreen instance active, this will return the
  // routing ID of the fullscreen widget. Returns 0 on failure.
  virtual int GetRoutingIDForWidget(PP_Instance instance) const = 0;

  // Converts the given plugin coordinate to the containing RenderView. This
  // will take into account the current Flash fullscreen state so will use
  // the fullscreen widget if it's displayed.
  virtual gfx::Point PluginPointToRenderView(
      PP_Instance instance,
      const gfx::Point& pt) const = 0;

  // Shares a file handle (HANDLE / file descriptor) with the remote side. It
  // returns a handle that should be sent in exactly one IPC message. Upon
  // receipt, the remote side then owns that handle. Note: if sending the
  // message fails, the returned handle is properly closed by the IPC system. If
  // |should_close_source| is set to true, the original handle is closed by this
  // operation and should not be used again.
  virtual IPC::PlatformFileForTransit ShareHandleWithRemote(
      base::PlatformFile handle,
      bool should_close_source) = 0;

  // Returns true if the plugin is running in process.
  virtual bool IsRunningInProcess() const = 0;

  // There are times when the renderer needs to create a ResourceHost in the
  // browser. This function does so asynchronously. |nested_msg| is the
  // resource host creation message and |instance| is the PP_Instance which
  // the resource will belong to. |callback| will be called with the pending
  // host ID when the ResourceHost has been created. This can be passed back
  // to the plugin to attach to the ResourceHost. A pending ID of 0 will be
  // passed to the callback upon error.
  virtual void CreateBrowserResourceHost(
      PP_Instance instance,
      const IPC::Message& nested_msg,
      const base::Callback<void(int)>& callback) const = 0;

 protected:
  virtual ~RendererPpapiHost() {}
};

}  // namespace content

#endif  // CONTENT_PUBLIC_RENDERER_RENDERER_PPAPI_HOST_H_