/*
 * Copyright (c) 2020 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 <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/control-devel.h>
#include <dali-toolkit/devel-api/visuals/visual-properties-devel.h>
#include <dali-toolkit/devel-api/visuals/color-visual-properties-devel.h>
#include <dali-toolkit/devel-api/visual-factory/transition-data.h>

using namespace Dali;
using namespace Dali::Toolkit;

namespace
{

const char* IMAGE_FILE( DEMO_IMAGE_DIR "gallery-medium-1.jpg" );

const float BLUR_RADIUS_VALUE( 10.0f );
const float NO_BLUR_VALUE( 0.0f );
const float ANIMATION_DURATION( 2.0f );

const Property::Value SHADOW
{
  { Visual::Property::TYPE, Visual::COLOR },
  { Visual::Property::MIX_COLOR, Vector4( 0.0f, 0.0f, 0.0f, 0.5f ) },
  { Visual::Property::TRANSFORM, Property::Map{ { Visual::Transform::Property::OFFSET, Vector2( 0.05f, 0.05f ) },
                                                { Visual::Transform::Property::SIZE, Vector2( 1.05f, 1.05f ) },
                                                { Visual::Transform::Property::ORIGIN, Align::CENTER },
                                                { Visual::Transform::Property::ANCHOR_POINT, Align::CENTER } } },
  { DevelColorVisual::Property::BLUR_RADIUS, BLUR_RADIUS_VALUE }
};

} // namespace

// This example shows the blur radius property of the color visual and animates it.
//
class ColorVisualExample : public ConnectionTracker
{
public:

  ColorVisualExample( Application& application )
  : mApplication( application ),
    mShadowVisible( true )
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect( this, &ColorVisualExample::Create );
  }

  ~ColorVisualExample()
  {
    // Nothing to do here;
  }

  // The Init signal is received once (only) during the Application lifetime
  void Create( Application& application )
  {
    // Get a handle to the window
    Window window = application.GetWindow();
    window.SetBackgroundColor( Color::WHITE );

    mImageView = ImageView::New( IMAGE_FILE );
    mImageView.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
    mImageView.SetProperty( Actor::Property::SIZE, Vector2( 200.0f, 200.0f ) );
    mImageView.SetProperty( DevelControl::Property::SHADOW, SHADOW );

    window.Add( mImageView );

    // Respond to a click anywhere on the window
    window.GetRootLayer().TouchSignal().Connect( this, &ColorVisualExample::OnTouch );

    // Respond to key events
    window.KeyEventSignal().Connect( this, &ColorVisualExample::OnKeyEvent );
  }

  bool OnTouch( Actor actor, const TouchEvent& touch )
  {
    if( touch.GetState( 0 ) == PointState::UP )
    {
      float initialValue, targetValue;
      if( !mShadowVisible )
      {
        initialValue = NO_BLUR_VALUE;
        targetValue = BLUR_RADIUS_VALUE;
      }
      else
      {
        initialValue = BLUR_RADIUS_VALUE;
        targetValue = NO_BLUR_VALUE;
      }

      mShadowVisible = !mShadowVisible;

      TransitionData transitionData = TransitionData::New( Property::Map().Add( "target", "shadow" )
                                                                          .Add( "property", "blurRadius" )
                                                                          .Add( "initialValue", initialValue )
                                                                          .Add( "targetValue", targetValue )
                                                                          .Add( "animator", Property::Map().Add( "duration", ANIMATION_DURATION ) ) );
      Animation animation = DevelControl::CreateTransition( Toolkit::Internal::GetImplementation( mImageView ), transitionData );
      animation.Play();
    }
    return true;
  }

  void OnKeyEvent( const KeyEvent& event )
  {
    if( event.GetState() == KeyEvent::Down )
    {
      if ( IsKey( event, Dali::DALI_KEY_ESCAPE ) || IsKey( event, Dali::DALI_KEY_BACK ) )
      {
        mApplication.Quit();
      }
    }
  }

private:
  Application&  mApplication;
  ImageView mImageView;
  bool mShadowVisible;
};

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