// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_MEDIA_MEDIA_MODULE_H_
#define COBALT_MEDIA_MEDIA_MODULE_H_

#include <map>
#include <memory>
#include <string>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop/message_loop.h"
#include "base/optional.h"
#include "base/threading/thread.h"
#include "cobalt/math/size.h"
#include "cobalt/media/can_play_type_handler.h"
#include "cobalt/media/decoder_buffer_allocator.h"
#include "cobalt/media/player/web_media_player_delegate.h"
#include "cobalt/media/player/web_media_player_impl.h"
#include "cobalt/media/web_media_player_factory.h"
#include "cobalt/render_tree/image.h"
#include "cobalt/render_tree/resource_provider.h"
#include "cobalt/system_window/system_window.h"

namespace cobalt {
namespace media {

class MediaModule : public WebMediaPlayerFactory,
                    public WebMediaPlayerDelegate {
 public:
  struct Options {
    Options() {}

    bool allow_resume_after_suspend = true;
  };

  typedef render_tree::Image Image;

  // MediaModule implementation should implement this function to allow creation
  // of CanPlayTypeHandler.
  static std::unique_ptr<CanPlayTypeHandler> CreateCanPlayTypeHandler();

  MediaModule(system_window::SystemWindow* system_window,
              render_tree::ResourceProvider* resource_provider,
              const Options& options = Options())
      : thread_("media_module"),
        options_(options),
        system_window_(system_window),
        resource_provider_(resource_provider) {
    thread_.Start();
    task_runner_ = thread_.task_runner();
  }

  // Returns true when the setting is set successfully or if the setting has
  // already been set to the expected value.  Returns false when the setting is
  // invalid or not set to the expected value.
  bool SetConfiguration(const std::string& name, int32 value) {
    SB_UNREFERENCED_PARAMETER(name);
    SB_UNREFERENCED_PARAMETER(value);
    return false;
  }

  // WebMediaPlayerFactory methods
  std::unique_ptr<WebMediaPlayer> CreateWebMediaPlayer(
      WebMediaPlayerClient* client) override;

  void Suspend();
  void Resume(render_tree::ResourceProvider* resource_provider);

  // TODO: Move the following methods into class like MediaModuleBase
  // to ensure that MediaModule is an interface.
  // WebMediaPlayerDelegate methods
  void RegisterPlayer(WebMediaPlayer* player) override;
  void UnregisterPlayer(WebMediaPlayer* player) override;

 private:
  void RegisterDebugState(WebMediaPlayer* player);
  void DeregisterDebugState();
  void SuspendTask();
  void ResumeTask();
  void RegisterPlayerTask(WebMediaPlayer* player);
  void UnregisterPlayerTask(WebMediaPlayer* player);

  SbDecodeTargetGraphicsContextProvider*
  GetSbDecodeTargetGraphicsContextProvider() {
#if SB_HAS(GRAPHICS)
    return resource_provider_->GetSbDecodeTargetGraphicsContextProvider();
#else   // SB_HAS(GRAPHICS)
    return NULL;
#endif  // SB_HAS(GRAPHICS)
  }

  // When the value of a particular player is true, it means the player is
  // paused by us.
  typedef std::map<WebMediaPlayer*, bool> Players;

  // The thread that |players_| is accessed from,
  base::Thread thread_;
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;

  const Options options_;
  system_window::SystemWindow* system_window_;
  cobalt::render_tree::ResourceProvider* resource_provider_;

  Players players_;
  bool suspended_ = false;

  DecoderBufferAllocator decoder_buffer_allocator_;
};

}  // namespace media
}  // namespace cobalt

#endif  // COBALT_MEDIA_MEDIA_MODULE_H_