// Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_DELEGATE_H_
#define WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_DELEGATE_H_

#include <string>

#include "base/callback.h"
#include "base/platform_file.h"
#include "base/ref_counted.h"
#include "base/shared_memory.h"
#include "base/sync_socket.h"
#include "gfx/size.h"
#include "googleurl/src/gurl.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_stdint.h"
#include "webkit/fileapi/file_system_types.h"
#include "webkit/glue/plugins/pepper_dir_contents.h"

class AudioMessageFilter;
class GURL;

namespace base {
class MessageLoopProxy;
class Time;
}

namespace fileapi {
class FileSystemCallbackDispatcher;
}

namespace gfx {
class Rect;
}

namespace gpu {
namespace gles2 {
class GLES2Implementation;
}
}

namespace skia {
class PlatformCanvas;
}

namespace WebKit {
class WebFileChooserCompletion;
struct WebFileChooserParams;
}

struct PP_VideoCompressedDataBuffer_Dev;
struct PP_VideoDecoderConfig_Dev;
struct PP_VideoUncompressedDataBuffer_Dev;

class TransportDIB;

namespace pepper {

class FileIO;
class PluginInstance;
class FullscreenContainer;

// Virtual interface that the browser implements to implement features for
// Pepper plugins.
class PluginDelegate {
 public:
  // Represents an image. This is to allow the browser layer to supply a correct
  // image representation. In Chrome, this will be a TransportDIB.
  class PlatformImage2D {
   public:
    virtual ~PlatformImage2D() {}

    // Caller will own the returned pointer, returns NULL on failure.
    virtual skia::PlatformCanvas* Map() = 0;

    // Returns the platform-specific shared memory handle of the data backing
    // this image. This is used by PPAPI proxying to send the image to the
    // out-of-process plugin. On success, the size in bytes will be placed into
    // |*bytes_count|. Returns 0 on failure.
    virtual intptr_t GetSharedMemoryHandle(uint32* byte_count) const = 0;

    virtual TransportDIB* GetTransportDIB() const = 0;
  };

  class PlatformContext3D {
   public:
    virtual ~PlatformContext3D() {}

    // Initialize the context.
    virtual bool Init() = 0;

    // Present the rendered frame to the compositor.
    virtual bool SwapBuffers() = 0;

    // Get the last EGL error.
    virtual unsigned GetError() = 0;

    // Resize the backing texture used as a back buffer by OpenGL.
    virtual void ResizeBackingTexture(const gfx::Size& size) = 0;

    // Set an optional callback that will be invoked when the side effects of
    // a SwapBuffers call become visible to the compositor. Takes ownership
    // of the callback.
    virtual void SetSwapBuffersCallback(Callback0::Type* callback) = 0;

    // If the plugin instance is backed by an OpenGL, return its ID in the
    // compositors namespace. Otherwise return 0. Returns 0 by default.
    virtual unsigned GetBackingTextureId() = 0;

    // This call will return the address of the GLES2 implementation for this
    // context that is constructed in Initialize() and is valid until this
    // context is destroyed.
    virtual gpu::gles2::GLES2Implementation* GetGLES2Implementation() = 0;
  };

  class PlatformAudio {
   public:
    class Client {
     protected:
      virtual ~Client() {}

     public:
      // Called when the stream is created.
      virtual void StreamCreated(base::SharedMemoryHandle shared_memory_handle,
                                 size_t shared_memory_size,
                                 base::SyncSocket::Handle socket) = 0;
    };

    // Starts the playback. Returns false on error or if called before the
    // stream is created or after the stream is closed.
    virtual bool StartPlayback() = 0;

    // Stops the playback. Returns false on error or if called before the stream
    // is created or after the stream is closed.
    virtual bool StopPlayback() = 0;

    // Closes the stream. Make sure to call this before the object is
    // destructed.
    virtual void ShutDown() = 0;

   protected:
    virtual ~PlatformAudio() {}
  };

  class PlatformVideoDecoder {
   public:
    virtual ~PlatformVideoDecoder() {}

    // Returns false on failure.
    virtual bool Decode(PP_VideoCompressedDataBuffer_Dev& input_buffer) = 0;
    virtual int32_t Flush(PP_CompletionCallback& callback) = 0;
    virtual bool ReturnUncompressedDataBuffer(
        PP_VideoUncompressedDataBuffer_Dev& buffer) = 0;
  };

  // Indicates that the given instance has been created.
  virtual void InstanceCreated(pepper::PluginInstance* instance) = 0;

  // Indicates that the given instance is being destroyed. This is called from
  // the destructor, so it's important that the instance is not dereferenced
  // from this call.
  virtual void InstanceDeleted(pepper::PluginInstance* instance) = 0;

  // The caller will own the pointer returned from this.
  virtual PlatformImage2D* CreateImage2D(int width, int height) = 0;

  // The caller will own the pointer returned from this.
  virtual PlatformContext3D* CreateContext3D() = 0;

  // The caller will own the pointer returned from this.
  virtual PlatformVideoDecoder* CreateVideoDecoder(
      const PP_VideoDecoderConfig_Dev& decoder_config) = 0;

  // The caller will own the pointer returned from this.
  virtual PlatformAudio* CreateAudio(uint32_t sample_rate,
                                     uint32_t sample_count,
                                     PlatformAudio::Client* client) = 0;

  // Notifies that the number of find results has changed.
  virtual void NumberOfFindResultsChanged(int identifier,
                                          int total,
                                          bool final_result) = 0;

  // Notifies that the index of the currently selected item has been updated.
  virtual void SelectedFindResultChanged(int identifier, int index) = 0;

  // Runs a file chooser.
  virtual bool RunFileChooser(
      const WebKit::WebFileChooserParams& params,
      WebKit::WebFileChooserCompletion* chooser_completion) = 0;

  // Sends an async IPC to open a file.
  typedef Callback2<base::PlatformFileError, base::PlatformFile
                    >::Type AsyncOpenFileCallback;
  virtual bool AsyncOpenFile(const FilePath& path,
                             int flags,
                             AsyncOpenFileCallback* callback) = 0;
  virtual bool OpenFileSystem(
      const GURL& url,
      fileapi::FileSystemType type,
      long long size,
      fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool MakeDirectory(
      const FilePath& path,
      bool recursive,
      fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool Query(const FilePath& path,
                     fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool Touch(const FilePath& path,
                     const base::Time& last_access_time,
                     const base::Time& last_modified_time,
                     fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool Delete(const FilePath& path,
                      fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool Rename(const FilePath& file_path,
                      const FilePath& new_file_path,
                      fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;
  virtual bool ReadDirectory(
      const FilePath& directory_path,
      fileapi::FileSystemCallbackDispatcher* dispatcher) = 0;

  virtual base::PlatformFileError OpenModuleLocalFile(
      const std::string& module_name,
      const FilePath& path,
      int flags,
      base::PlatformFile* file) = 0;
  virtual base::PlatformFileError RenameModuleLocalFile(
      const std::string& module_name,
      const FilePath& path_from,
      const FilePath& path_to) = 0;
  virtual base::PlatformFileError DeleteModuleLocalFileOrDir(
      const std::string& module_name,
      const FilePath& path,
      bool recursive) = 0;
  virtual base::PlatformFileError CreateModuleLocalDir(
      const std::string& module_name,
      const FilePath& path) = 0;
  virtual base::PlatformFileError QueryModuleLocalFile(
      const std::string& module_name,
      const FilePath& path,
      base::PlatformFileInfo* info) = 0;
  virtual base::PlatformFileError GetModuleLocalDirContents(
      const std::string& module_name,
      const FilePath& path,
      PepperDirContents* contents) = 0;

  // Returns a MessageLoopProxy instance associated with the message loop
  // of the file thread in this renderer.
  virtual scoped_refptr<base::MessageLoopProxy>
  GetFileThreadMessageLoopProxy() = 0;

  // Create a fullscreen container for a plugin instance. This effectively
  // switches the plugin to fullscreen.
  virtual FullscreenContainer* CreateFullscreenContainer(
      PluginInstance* instance) = 0;

  // Returns a string with the name of the default 8-bit char encoding.
  virtual std::string GetDefaultEncoding() = 0;

  // Sets the mininum and maximium zoom factors.
  virtual void ZoomLimitsChanged(double minimum_factor,
                                 double maximum_factor) = 0;

  // Retrieves the proxy information for the given URL in PAC format. On error,
  // this will return an empty string.
  virtual std::string ResolveProxy(const GURL& url) = 0;

  // Tell the browser when resource loading starts/ends.
  virtual void DidStartLoading() = 0;
  virtual void DidStopLoading() = 0;

  // Sets restrictions on how the content can be used (i.e. no print/copy).
  virtual void SetContentRestriction(int restrictions) = 0;
};

}  // namespace pepper

#endif  // WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_DELEGATE_H_