/*
 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
 *
 * 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.
 *
 */

#include <sstream>
#include <iomanip>

#include "shared/view.h"
#include <dali/dali.h>
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/shader-effects/motion-blur-effect.h>

using namespace Dali;
using namespace Dali::Toolkit;



namespace // unnamed namespace
{

////////////////////////////////////////////////////
//
// Demo setup parameters
//

const float MOTION_BLUR_ACTOR_WIDTH = 256;                                          // actor size on screen
const float MOTION_BLUR_ACTOR_HEIGHT = 256;                                         // ""
const unsigned int MOTION_BLUR_NUM_SAMPLES = 8;

const int MOTION_BLUR_NUM_ACTOR_IMAGES = 5;
const char* MOTION_BLUR_ACTOR_IMAGE1( DEMO_IMAGE_DIR "image-with-border-1.jpg" );
const char* MOTION_BLUR_ACTOR_IMAGE2( DEMO_IMAGE_DIR "image-with-border-2.jpg" );
const char* MOTION_BLUR_ACTOR_IMAGE3( DEMO_IMAGE_DIR "image-with-border-3.jpg" );
const char* MOTION_BLUR_ACTOR_IMAGE4( DEMO_IMAGE_DIR "image-with-border-4.jpg" );
const char* MOTION_BLUR_ACTOR_IMAGE5( DEMO_IMAGE_DIR "image-with-border-1.jpg" );

const char* MOTION_BLUR_ACTOR_IMAGES[] = {
  MOTION_BLUR_ACTOR_IMAGE1,
  MOTION_BLUR_ACTOR_IMAGE2,
  MOTION_BLUR_ACTOR_IMAGE3,
  MOTION_BLUR_ACTOR_IMAGE4,
  MOTION_BLUR_ACTOR_IMAGE5,
};

const int NUM_ACTOR_ANIMATIONS = 4;
const int NUM_CAMERA_ANIMATIONS = 2;


const char* BACKGROUND_IMAGE_PATH = DEMO_IMAGE_DIR "background-default.png";

const char* TOOLBAR_IMAGE( DEMO_IMAGE_DIR "top-bar.png" );
const char* LAYOUT_IMAGE( DEMO_IMAGE_DIR "icon-change.png" );
const char* LAYOUT_IMAGE_SELECTED( DEMO_IMAGE_DIR "icon-change-selected.png" );
const char* APPLICATION_TITLE( "Motion Blur" );
const char* EFFECTS_OFF_ICON( DEMO_IMAGE_DIR "icon-effects-off.png" );
const char* EFFECTS_OFF_ICON_SELECTED( DEMO_IMAGE_DIR "icon-effects-off-selected.png" );
const char* EFFECTS_ON_ICON( DEMO_IMAGE_DIR "icon-effects-on.png" );
const char* EFFECTS_ON_ICON_SELECTED( DEMO_IMAGE_DIR "icon-effects-on-selected.png" );

const float UI_MARGIN = 4.0f;                              ///< Screen Margin for placement of UI buttons

const Vector3 BUTTON_SIZE_CONSTRAINT( 0.24f, 0.09f, 1.0f );
const Vector3 BUTTON_TITLE_LABEL_TAP_HERE_SIZE_CONSTRAINT( 0.55f, 0.06f, 1.0f );
const Vector3 BUTTON_TITLE_LABEL_INSTRUCTIONS_POPUP_SIZE_CONSTRAINT( 1.0f, 1.0f, 1.0f );

// move this button down a bit so it is visible on target and not covered up by toolbar
const float BUTTON_TITLE_LABEL_Y_OFFSET = 0.05f;

const float ORIENTATION_DURATION = 0.5f;                  ///< Time to rotate to new orientation.

/**
 * @brief Set an image to image view, scaled-down to no more than the dimensions passed in.
 *
 * Uses SHRINK_TO_FIT which ensures the resulting image is
 * smaller than or equal to the specified dimensions while preserving its original aspect ratio.
 */
void SetImageFittedInBox( ImageView& imageView, Property::Map& shaderEffect, const char * const imagePath, int maxWidth, int maxHeight )
{
  Property::Map map;
  map[Visual::Property::TYPE] = Visual::IMAGE;
  map[ImageVisual::Property::URL] = imagePath;
  // Load the image nicely scaled-down to fit within the specified max width and height:
  map[ImageVisual::Property::DESIRED_WIDTH] = maxWidth;
  map[ImageVisual::Property::DESIRED_HEIGHT] = maxHeight;
  map[ImageVisual::Property::FITTING_MODE] = FittingMode::SHRINK_TO_FIT;
  map[ImageVisual::Property::SAMPLING_MODE] = SamplingMode::BOX_THEN_LINEAR;
  map.Merge( shaderEffect );

  imageView.SetProperty( ImageView::Property::IMAGE, map );
}

} // unnamed namespace


//
class MotionBlurExampleApp : public ConnectionTracker
{
public:

  /**
     * DeviceOrientation describes the four different
     * orientations the device can be in based on accelerometer reports.
     */
  enum DeviceOrientation
  {
    PORTRAIT = 0,
    LANDSCAPE = 90,
    PORTRAIT_INVERSE = 180,
    LANDSCAPE_INVERSE = 270
  };

  /**
   * Constructor
   * @param application class, stored as reference
   */
  MotionBlurExampleApp(Application &app)
  : mApplication(app),
    mActorEffectsEnabled(false),
    mCurrentActorAnimation(0),
    mCurrentImage(0),
    mOrientation( PORTRAIT )
  {
    // Connect to the Application's Init signal
    app.InitSignal().Connect(this, &MotionBlurExampleApp::OnInit);
  }

  ~MotionBlurExampleApp()
  {
    // Nothing to do here; everything gets deleted automatically
  }

  /**
   * This method gets called once the main loop of application is up and running
   */
  void OnInit(Application& app)
  {
    // The Init signal is received once (only) during the Application lifetime

    Stage::GetCurrent().KeyEventSignal().Connect(this, &MotionBlurExampleApp::OnKeyEvent);


    // Creates a default view with a default tool bar.
    // The view is added to the stage.
    mContentLayer = DemoHelper::CreateView( mApplication,
                                            mView,
                                            mToolBar,
                                            BACKGROUND_IMAGE_PATH,
                                            TOOLBAR_IMAGE,
                                            APPLICATION_TITLE );

    // Ensure the content layer is a square so the touch area works in all orientations
    Vector2 stageSize = Stage::GetCurrent().GetSize();
    float size = std::max( stageSize.width, stageSize.height );
    mContentLayer.SetSize( size, size );

    //Add an effects icon on the right of the title
    mActorEffectsButton = Toolkit::PushButton::New();
    mActorEffectsButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, EFFECTS_OFF_ICON );
    mActorEffectsButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, EFFECTS_OFF_ICON_SELECTED );
    mActorEffectsButton.ClickedSignal().Connect( this, &MotionBlurExampleApp::OnEffectButtonClicked );
    mToolBar.AddControl( mActorEffectsButton, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage, Toolkit::Alignment::HorizontalCenter, DemoHelper::DEFAULT_PLAY_PADDING );

    // Creates a mode button.
    // Create a effect toggle button. (right of toolbar)
    Toolkit::PushButton layoutButton = Toolkit::PushButton::New();
    layoutButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, LAYOUT_IMAGE );
    layoutButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, LAYOUT_IMAGE_SELECTED );
    layoutButton.ClickedSignal().Connect( this, &MotionBlurExampleApp::OnLayoutButtonClicked);
    layoutButton.SetLeaveRequired( true );
    mToolBar.AddControl( layoutButton, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage, Toolkit::Alignment::HorizontalRight, DemoHelper::DEFAULT_MODE_SWITCH_PADDING );

    // Input
    mTapGestureDetector = TapGestureDetector::New();
    mTapGestureDetector.Attach( mContentLayer );
    mTapGestureDetector.DetectedSignal().Connect( this, &MotionBlurExampleApp::OnTap );

    Dali::Window winHandle = app.GetWindow();
    winHandle.AddAvailableOrientation( Dali::Window::PORTRAIT );
    winHandle.AddAvailableOrientation( Dali::Window::LANDSCAPE );
    winHandle.AddAvailableOrientation( Dali::Window::PORTRAIT_INVERSE  );
    winHandle.AddAvailableOrientation( Dali::Window::LANDSCAPE_INVERSE );
    winHandle.ResizedSignal().Connect( this, &MotionBlurExampleApp::OnWindowResized );

    // set initial orientation
    Rotate( PORTRAIT );

    ///////////////////////////////////////////////////////
    //
    // Motion blurred actor
    //

    // Scale down actor to fit on very low resolution screens with space to interact:
    mMotionBlurActorSize = Size( std::min( stageSize.x * 0.3f, MOTION_BLUR_ACTOR_WIDTH ), std::min( stageSize.y * 0.3f, MOTION_BLUR_ACTOR_HEIGHT ) );
    mMotionBlurActorSize = Size( std::min( mMotionBlurActorSize.x, mMotionBlurActorSize.y ), std::min( mMotionBlurActorSize.x, mMotionBlurActorSize.y ) );

    mMotionBlurEffect = CreateMotionBlurEffect();
    mMotionBlurImageView = ImageView::New();
    SetImageFittedInBox( mMotionBlurImageView, mMotionBlurEffect, MOTION_BLUR_ACTOR_IMAGE1, mMotionBlurActorSize.x, mMotionBlurActorSize.y );
    mMotionBlurImageView.SetParentOrigin( ParentOrigin::CENTER );
    mMotionBlurImageView.SetSize(mMotionBlurActorSize.x, mMotionBlurActorSize.y);

    mContentLayer.Add( mMotionBlurImageView );

    // Create shader used for doing motion blur
    mMotionBlurEffect = CreateMotionBlurEffect();

    // set actor shader to the blur one
    Toolkit::SetMotionBlurProperties( mMotionBlurImageView, MOTION_BLUR_NUM_SAMPLES );

  }

  //////////////////////////////////////////////////////////////
  //
  // Device Orientation Support
  //
  //

  void OnWindowResized( Window::WindowSize size )
  {
    Rotate( size.GetWidth() > size.GetHeight() ? LANDSCAPE : PORTRAIT );
  }

  void Rotate( DeviceOrientation orientation )
  {
    // Resize the root actor
    const Vector2 targetSize = Stage::GetCurrent().GetSize();

    if( mOrientation != orientation )
    {
      mOrientation = orientation;

      // check if actor is on stage
      if( mView.GetParent() )
      {
        // has parent so we expect it to be on stage, start animation
        mRotateAnimation = Animation::New( ORIENTATION_DURATION );
        mRotateAnimation.AnimateTo( Property( mView, Actor::Property::SIZE_WIDTH ), targetSize.width );
        mRotateAnimation.AnimateTo( Property( mView, Actor::Property::SIZE_HEIGHT ), targetSize.height );
        mRotateAnimation.Play();
      }
      else
      {
        mView.SetSize( targetSize );
      }
    }
    else
    {
      // for first time just set size
      mView.SetSize( targetSize );
    }
  }


  //////////////////////////////////////////////////////////////
  //
  // Actor Animation
  //
  //

  // move to point on screen that was tapped
  void OnTap( Actor actor, const TapGesture& tapGesture )
  {
    Vector3 destPos;
    float originOffsetX, originOffsetY;

    // rotate offset (from top left origin to centre) into actor space
    Vector2 stageSize = Dali::Stage::GetCurrent().GetSize();
    actor.ScreenToLocal(originOffsetX, originOffsetY, stageSize.width * 0.5f, stageSize.height * 0.5f);

    // get dest point in local actor space
    destPos.x = tapGesture.localPoint.x - originOffsetX;
    destPos.y = tapGesture.localPoint.y - originOffsetY;
    destPos.z = 0.0f;

    float animDuration = 0.5f;
    mActorTapMovementAnimation = Animation::New( animDuration );
    if ( mMotionBlurImageView )
    {
      mActorTapMovementAnimation.AnimateTo( Property(mMotionBlurImageView, Actor::Property::POSITION), destPos, AlphaFunction::EASE_IN_OUT_SINE, TimePeriod(animDuration) );
    }
    mActorTapMovementAnimation.SetEndAction( Animation::Bake );
    mActorTapMovementAnimation.Play();


    // perform some spinning etc
    if(mActorEffectsEnabled)
    {
      switch(mCurrentActorAnimation)
      {
        // spin around y
        case 0:
        {
          float animDuration = 1.0f;
          mActorAnimation = Animation::New(animDuration);
          mActorAnimation.AnimateBy( Property( mMotionBlurImageView, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree(360.0f) ), Vector3::YAXIS ), AlphaFunction::EASE_IN_OUT );
          mActorAnimation.SetEndAction( Animation::Bake );
          mActorAnimation.Play();
        }
        break;

        // spin around z
        case 1:
        {
          float animDuration = 1.0f;
          mActorAnimation = Animation::New(animDuration);
          mActorAnimation.AnimateBy( Property( mMotionBlurImageView, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree(360.0f) ), Vector3::ZAXIS ), AlphaFunction::EASE_IN_OUT );
          mActorAnimation.SetEndAction( Animation::Bake );
          mActorAnimation.Play();
        }
        break;

        // spin around y and z
        case 2:
        {
          float animDuration = 1.0f;
          mActorAnimation = Animation::New(animDuration);
          mActorAnimation.AnimateBy( Property( mMotionBlurImageView, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree(360.0f) ), Vector3::YAXIS ), AlphaFunction::EASE_IN_OUT );
          mActorAnimation.AnimateBy( Property( mMotionBlurImageView, Actor::Property::ORIENTATION ), Quaternion( Radian( Degree(360.0f) ), Vector3::ZAXIS ), AlphaFunction::EASE_IN_OUT );
          mActorAnimation.SetEndAction( Animation::Bake );
          mActorAnimation.Play();
        }
        break;

        // scale
        case 3:
        {
          float animDuration = 1.0f;
          mActorAnimation = Animation::New(animDuration);
          mActorAnimation.AnimateBy( Property( mMotionBlurImageView, Actor::Property::SCALE ), Vector3(2.0f, 2.0f, 2.0f), AlphaFunction::BOUNCE, TimePeriod( 0.0f, 1.0f ) );
          mActorAnimation.SetEndAction( Animation::Bake );
          mActorAnimation.Play();
        }
        break;

        default:
          break;
      }

      mCurrentActorAnimation++;
      if(NUM_ACTOR_ANIMATIONS == mCurrentActorAnimation)
      {
        mCurrentActorAnimation = 0;
      }
    }
  }

  void ToggleActorEffects()
  {
    if(!mActorEffectsEnabled)
    {
      mActorEffectsEnabled = true;
      mActorEffectsButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, EFFECTS_ON_ICON );
      mActorEffectsButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, EFFECTS_ON_ICON_SELECTED );
    }
    else
    {
      mActorEffectsEnabled = false;
      mActorEffectsButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, EFFECTS_OFF_ICON );
      mActorEffectsButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, EFFECTS_OFF_ICON_SELECTED );
    }
  }

  //////////////////////////////////////////////////////////////
  //
  // Input handlers
  //
  //

  bool OnLayoutButtonClicked( Toolkit::Button button )
  {
    ChangeImage();
    return true;
  }

  bool OnEffectButtonClicked( Toolkit::Button button )
  {
    ToggleActorEffects();
    return true;
  }

  /**
   * Main key event handler
   */
  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.state == KeyEvent::Down)
    {
      if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
      {
        mApplication.Quit();
      }
    }
  }

  //////////////////////////////////////////////////////////////
  //
  // Misc
  //
  //


  void ChangeImage()
  {
    mCurrentImage++;
    if(MOTION_BLUR_NUM_ACTOR_IMAGES == mCurrentImage)
    {
      mCurrentImage = 0;
    }
    SetImageFittedInBox( mMotionBlurImageView, mMotionBlurEffect, MOTION_BLUR_ACTOR_IMAGES[mCurrentImage], mMotionBlurActorSize.x, mMotionBlurActorSize.y );

  }


private:
  Application&               mApplication;            ///< Application instance
  Toolkit::Control           mView;
  Toolkit::ToolBar           mToolBar;

  Layer                      mContentLayer;           ///< Content layer (contains actor for this blur demo)

  PushButton                 mActorEffectsButton;     ///< The actor effects toggling Button.

  // Motion blur
  Property::Map mMotionBlurEffect;
  ImageView mMotionBlurImageView;
  Size mMotionBlurActorSize;

  // animate actor to position where user taps screen
  Animation mActorTapMovementAnimation;

  // show different animations to demonstrate blur effect working on an object only movement basis
  bool mActorEffectsEnabled;
  Animation mActorAnimation;
  int mCurrentActorAnimation;

  // offer a selection of images that user can cycle between
  int mCurrentImage;

  TapGestureDetector mTapGestureDetector;

  DeviceOrientation mOrientation;               ///< Current Device orientation
  Animation mRotateAnimation;                   ///< Animation for rotating between landscape and portrait.
};

int DALI_EXPORT_API main(int argc, char **argv)
{
  Application app = Application::New(&argc, &argv, DEMO_THEME_PATH);
  MotionBlurExampleApp test(app);
  app.MainLoop();
  return 0;
}