/*

     File: ASCSlideScenegraphSummary.m

 Abstract: Recaps the structure of the scene graph with an example.

  Version: 1.1

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 */

#import "ASCPresentationViewController.h"

#import "ASCSlideTextManager.h"

#import "ASCSlide.h"

#import "Utils.h"

@interface ASCSlideSceneGraphSummary : ASCSlide {

    SCNNode *_sunNode;

    SCNNode *_sunHaloNode;

    SCNNode *_earthNode;

    SCNNode *_earthGroupNode;

    SCNNode *_moonNode;

    SCNNode *_wireframeBoxNode;

}

@end

@implementation ASCSlideSceneGraphSummary

- (NSUInteger)numberOfSteps {

    return 6;

}

- (void)presentStepIndex:(NSUInteger)index withPresentionViewController:(ASCPresentationViewController *)presentationViewController {

    switch (index) {

        case 0:

            // Set the slide's title and subtitle

            self.textManager.title = @"Scene Graph";

            self.textManager.subtitle = @"Summary";

            break;

        case 1:

        {

            // A node that will help visualize the position of the stars

            _wireframeBoxNode = [SCNNode node];

            _wireframeBoxNode.rotation = SCNVector4Make(0, 1, 0, M_PI_4);

            _wireframeBoxNode.geometry = [SCNBox boxWithWidth:1 height:1 length:1 chamferRadius:0];

            _wireframeBoxNode.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"box_wireframe"];

            _wireframeBoxNode.geometry.firstMaterial.lightingModelName = SCNLightingModelConstant; // no lighting

            _wireframeBoxNode.geometry.firstMaterial.doubleSided = YES; // double sided

            // Sun

            _sunNode = [SCNNode node];

            _sunNode.position = SCNVector3Make(0, 30, 0);

            [self.contentNode addChildNode:_sunNode];

            [_sunNode addChildNode:[_wireframeBoxNode copy]];

            // Earth-rotation (center of rotation of the Earth around the Sun)

            SCNNode *earthRotationNode = [SCNNode node];

            [_sunNode addChildNode:earthRotationNode];

            // Earth-group (will contain the Earth, and the Moon)

            _earthGroupNode = [SCNNode node];

            _earthGroupNode.position = SCNVector3Make(15, 0, 0);

            [earthRotationNode addChildNode:_earthGroupNode];

            // Earth

            _earthNode = [_wireframeBoxNode copy];

            _earthNode.position = SCNVector3Make(0, 0, 0);

            [_earthGroupNode addChildNode:_earthNode];

            // Rotate the Earth around the Sun

            CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"rotation"];

            animation.duration = 10.0;

            animation.toValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, M_PI * 2)];

            animation.repeatCount = FLT_MAX;

            [earthRotationNode addAnimation:animation forKey:@"earth rotation around sun"];

            // Rotate the Earth

            animation = [CABasicAnimation animationWithKeyPath:@"rotation"];

            animation.duration = 1.0;

            animation.fromValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, 0)];

            animation.toValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, M_PI * 2)];

            animation.repeatCount = FLT_MAX;

            [_earthNode addAnimation:animation forKey:@"earth rotation"];

            break;

        }

        case 2:

        {

            // Moon-rotation (center of rotation of the Moon around the Earth)

            SCNNode *moonRotationNode = [SCNNode node];

            [_earthGroupNode addChildNode:moonRotationNode];

            // Moon

            _moonNode = [_wireframeBoxNode copy];

            _moonNode.position = SCNVector3Make(5, 0, 0);

            [moonRotationNode addChildNode:_moonNode];

            // Rotate the moon around the Earth

            CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"rotation"];

            animation.duration = 1.5;

            animation.toValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, M_PI * 2)];

            animation.repeatCount = FLT_MAX;

            [moonRotationNode addAnimation:animation forKey:@"moon rotation around earth"];

            // Rotate the moon

            animation = [CABasicAnimation animationWithKeyPath:@"rotation"];

            animation.duration = 1.5;

            animation.toValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, M_PI * 2)];

            animation.repeatCount = FLT_MAX;

            [_moonNode addAnimation:animation forKey:@"moon rotation"];

            break;

        }

        case 3:

        {

            // Add geometries (spheres) to represent the stars

            _sunNode.geometry = [SCNSphere sphereWithRadius:2.5];

            _earthNode.geometry = [SCNSphere sphereWithRadius:1.5];

            _moonNode.geometry = [SCNSphere sphereWithRadius:0.75];

            // Add a textured plane to represent Earth's orbit

            SCNNode *earthOrbit = [SCNNode node];

            earthOrbit.opacity = 0.4;

            earthOrbit.geometry = [SCNPlane planeWithWidth:31 height:31];

            earthOrbit.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"orbit"];

            earthOrbit.geometry.firstMaterial.diffuse.mipFilter = SCNFilterModeLinear;

            earthOrbit.rotation = SCNVector4Make(1, 0, 0, -M_PI_2);

            earthOrbit.geometry.firstMaterial.lightingModelName = SCNLightingModelConstant; // no lighting

            [_sunNode addChildNode:earthOrbit];

            break;

        }

        case 4:

        {

            // Add a halo to the Sun (a simple textured plane that does not write to depth)

            _sunHaloNode = [SCNNode node];

            _sunHaloNode.geometry = [SCNPlane planeWithWidth:30 height:30];

            _sunHaloNode.rotation = SCNVector4Make(1, 0, 0, self.pitch * M_PI / 180.0);

            _sunHaloNode.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"sun-halo"];

            _sunHaloNode.geometry.firstMaterial.lightingModelName = SCNLightingModelConstant; // no lighting

            _sunHaloNode.geometry.firstMaterial.writesToDepthBuffer = NO; // do not write to depth

            _sunHaloNode.opacity = 0.2;

            [_sunNode addChildNode:_sunHaloNode];

            // Add materials to the stars

            _earthNode.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"earth-diffuse-mini"];

            _earthNode.geometry.firstMaterial.emission.contents = [NSImage imageNamed:@"earth-emissive-mini"];

            _earthNode.geometry.firstMaterial.specular.contents = [NSImage imageNamed:@"earth-specular-mini"];

            _moonNode.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"moon"];

            _sunNode.geometry.firstMaterial.multiply.contents = [NSImage imageNamed:@"sun"];

            _sunNode.geometry.firstMaterial.diffuse.contents = [NSImage imageNamed:@"sun"];

            _sunNode.geometry.firstMaterial.multiply.intensity = 0.5;

            _sunNode.geometry.firstMaterial.lightingModelName = SCNLightingModelConstant;

            _sunNode.geometry.firstMaterial.multiply.wrapS =

            _sunNode.geometry.firstMaterial.diffuse.wrapS  =

            _sunNode.geometry.firstMaterial.multiply.wrapT =

            _sunNode.geometry.firstMaterial.diffuse.wrapT  = SCNWrapModeRepeat;

            _earthNode.geometry.firstMaterial.locksAmbientWithDiffuse =

            _moonNode.geometry.firstMaterial.locksAmbientWithDiffuse  =

            _sunNode.geometry.firstMaterial.locksAmbientWithDiffuse   = YES;

            _earthNode.geometry.firstMaterial.shininess = 0.1;

            _earthNode.geometry.firstMaterial.specular.intensity = 0.5;

            _moonNode.geometry.firstMaterial.specular.contents = [NSColor grayColor];

            // Achieve a lava effect by animating textures

            CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"contentsTransform"];

            animation.duration = 10.0;

            animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DConcat(CATransform3DMakeTranslation(0, 0, 0), CATransform3DMakeScale(3, 3, 3))];

            animation.toValue = [NSValue valueWithCATransform3D:CATransform3DConcat(CATransform3DMakeTranslation(1, 0, 0), CATransform3DMakeScale(3, 3, 3))];

            animation.repeatCount = FLT_MAX;

            [_sunNode.geometry.firstMaterial.diffuse addAnimation:animation forKey:@"sun-texture"];

            animation = [CABasicAnimation animationWithKeyPath:@"contentsTransform"];

            animation.duration = 30.0;

            animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DConcat(CATransform3DMakeTranslation(0, 0, 0), CATransform3DMakeScale(5, 5, 5))];

            animation.toValue = [NSValue valueWithCATransform3D:CATransform3DConcat(CATransform3DMakeTranslation(1, 0, 0), CATransform3DMakeScale(5, 5, 5))];

            animation.repeatCount = FLT_MAX;

            [_sunNode.geometry.firstMaterial.multiply addAnimation:animation forKey:@"sun-texture2"];

            break;

        }

        case 5:

        {

            // We will turn off all the lights in the scene and add a new light

            // to give the impression that the Sun lights the scene

            SCNNode *lightNode = [SCNNode node];

            lightNode.light = [SCNLight light];

            lightNode.light.color = [NSColor blackColor]; // initially switched off

            lightNode.light.type = SCNLightTypeOmni;

            [_sunNode addChildNode:lightNode];

            // Configure attenuation distances because we don't want to light the floor

            [lightNode.light setAttribute:@20 forKey:SCNLightAttenuationEndKey];

            [lightNode.light setAttribute:@19.5 forKey:SCNLightAttenuationStartKey];

            // Animation

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1];

            {

                lightNode.light.color = [NSColor whiteColor]; // switch on

                [presentationViewController updateLightingWithIntensities:@[@0.0]]; //switch off all the other lights

                _sunHaloNode.opacity = 0.5; // make the halo stronger

            }

            [SCNTransaction commit];

            break;

        }

    }

}

@end