// 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 REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_
#define REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_

#include <string>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "remoting/host/desktop_environment.h"
#include "remoting/host/ui_strings.h"

namespace remoting {

// Used to create audio/video capturers and event executor that work with
// the local console.
class BasicDesktopEnvironment : public DesktopEnvironment {
 public:
  virtual ~BasicDesktopEnvironment();

  // DesktopEnvironment implementation.
  virtual scoped_ptr<AudioCapturer> CreateAudioCapturer() OVERRIDE;
  virtual scoped_ptr<InputInjector> CreateInputInjector() OVERRIDE;
  virtual scoped_ptr<ScreenControls> CreateScreenControls() OVERRIDE;
  virtual scoped_ptr<webrtc::ScreenCapturer> CreateVideoCapturer() OVERRIDE;
  virtual std::string GetCapabilities() const OVERRIDE;
  virtual void SetCapabilities(const std::string& capabilities) OVERRIDE;

 protected:
  friend class BasicDesktopEnvironmentFactory;

  // |ui_strings| are hosted by the BasicDesktopEnvironmentFactory instance that
  // created |this|. |ui_strings| must outlive this object.
  BasicDesktopEnvironment(
      scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
      scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);

  scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner() const {
    return caller_task_runner_;
  }

  scoped_refptr<base::SingleThreadTaskRunner> input_task_runner() const {
    return input_task_runner_;
  }

  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner() const {
    return ui_task_runner_;
  }

 private:
  // Task runner on which methods of DesktopEnvironment interface should be
  // called.
  scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;

  // Used to run input-related tasks.
  scoped_refptr<base::SingleThreadTaskRunner> input_task_runner_;

  // Used to run UI code.
  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;

  DISALLOW_COPY_AND_ASSIGN(BasicDesktopEnvironment);
};

// Used to create |BasicDesktopEnvironment| instances.
class BasicDesktopEnvironmentFactory : public DesktopEnvironmentFactory {
 public:
  BasicDesktopEnvironmentFactory(
      scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
      scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
      const UiStrings& ui_strings);
  virtual ~BasicDesktopEnvironmentFactory();

  // DesktopEnvironmentFactory implementation.
  virtual bool SupportsAudioCapture() const OVERRIDE;

 protected:
  scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner() const {
    return caller_task_runner_;
  }

  scoped_refptr<base::SingleThreadTaskRunner> input_task_runner() const {
    return input_task_runner_;
  }

  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner() const {
    return ui_task_runner_;
  }

  const UiStrings& ui_strings() const { return ui_strings_; }

 private:
  // Task runner on which methods of DesktopEnvironmentFactory interface should
  // be called.
  scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;

  // Used to run input-related tasks.
  scoped_refptr<base::SingleThreadTaskRunner> input_task_runner_;

  // Used to run UI code.
  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;

  // Contains a copy of the localized UI strings.
  const UiStrings ui_strings_;

  DISALLOW_COPY_AND_ASSIGN(BasicDesktopEnvironmentFactory);
};

}  // namespace remoting

#endif  // REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_