/*

     File: ASCSlideMaterialProperties.m

 Abstract: Illustrates how the different material properties affect the appearance of an object.

  Version: 1.1

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 */

#import "ASCPresentationViewController.h"

#import "ASCSlideTextManager.h"

#import "ASCSlide.h"

#import "Utils.h"

@interface ASCSlideMaterialProperties : ASCSlide

@end

@implementation ASCSlideMaterialProperties {

    SCNNode *_earthNode;

    SCNNode *_cloudsNode;

    SCNVector3 _cameraOriginalPosition;

}

- (NSUInteger)numberOfSteps {

    return 18;

}

- (void)setupSlideWithPresentationViewController:(ASCPresentationViewController *)presentationViewController

{

    // Create a node for Earth and another node to display clouds

    // Use the 'pivot' property to tilt Earth because we don't want to see the north pole.

    _earthNode = [SCNNode node];

    _earthNode.pivot = CATransform3DMakeRotation(M_PI * 0.1, 1, 0, 0);

    _earthNode.position = SCNVector3Make(6, 7.2, -2);

    _earthNode.geometry = [SCNSphere sphereWithRadius:7.2];

    _cloudsNode = [SCNNode node];

    _cloudsNode.geometry = [SCNSphere sphereWithRadius:7.9];

    [self.groundNode addChildNode:_earthNode];

    [_earthNode addChildNode:_cloudsNode];

    // Initially hide everything

    _earthNode.opacity = 0.0;

    _cloudsNode.opacity = 0.0;

    _earthNode.geometry.firstMaterial.ambient.intensity = 0;

    _earthNode.geometry.firstMaterial.normal.intensity = 0;

    _earthNode.geometry.firstMaterial.reflective.intensity = 0;

    _earthNode.geometry.firstMaterial.emission.intensity = 0;

    // Use a shader modifier to display an environment map independently of the lighting model used

    _earthNode.geometry.shaderModifiers = @{ SCNShaderModifierEntryPointFragment :

                                                 @" _output.color.rgb -= _surface.reflective.rgb * _lightingContribution.diffuse;"

                                             @"_output.color.rgb += _surface.reflective.rgb;" };

    // Add animations

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

    rotationAnimation.duration = 40.0;

    rotationAnimation.repeatCount = FLT_MAX;

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

    [_earthNode addAnimation:rotationAnimation forKey:nil];

    rotationAnimation.duration = 100.0;

    [_cloudsNode addAnimation:rotationAnimation forKey:nil];

}

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

    [SCNTransaction begin];

    [SCNTransaction setAnimationDuration:1.0];

    switch (index) {

        case 0:

            // Set the slide's title and add some code

            self.textManager.title = @"Materials";

            [self.textManager addBullet:@"Diffuse" atLevel:0];

            [self.textManager addBullet:@"Ambient" atLevel:0];

            [self.textManager addBullet:@"Specular and shininess" atLevel:0];

            [self.textManager addBullet:@"Normal" atLevel:0];

            [self.textManager addBullet:@"Reflective" atLevel:0];

            [self.textManager addBullet:@"Emission" atLevel:0];

            [self.textManager addBullet:@"Transparent" atLevel:0];

            [self.textManager addBullet:@"Multiply" atLevel:0];

            break;

        case 1:

            _earthNode.opacity = 1.0;

            [presentationViewController updateLightingWithIntensities:@[@1]];

            break;

        case 2:

            _earthNode.geometry.firstMaterial.diffuse.contents = [NSColor blueColor];

            [self.textManager highlightBulletAtIndex:0];

            [self showCodeExample:@"material.#diffuse.contents# = [NSColor blueColor];" illustrationImageName:nil];

            break;

        case 3:

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

            [self showCodeExample:@"material.#diffuse.contents# =" illustrationImageName:@"earth-diffuse-mini"];

            break;

        case 4:

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

            _earthNode.geometry.firstMaterial.ambient.intensity = 1;

            [self.textManager highlightBulletAtIndex:1];

            [self showCodeExample:@"material.#ambient#.contents =" illustrationImageName:@"earth-diffuse-mini"];

            [presentationViewController updateLightingWithIntensities:self.lightIntensities];

            break;

        case 5:

            _earthNode.geometry.firstMaterial.shininess = 0.1;

            _earthNode.geometry.firstMaterial.specular.contents = [NSColor whiteColor];

            [self.textManager highlightBulletAtIndex:2];

            [self showCodeExample:@"material.#specular#.contents = [NSColor whiteColor];" illustrationImageName:nil];

            break;

        case 6:

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

            [self showCodeExample:@"material.#specular#.contents =" illustrationImageName:@"earth-specular-mini"];

            break;

        case 7:

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

            _earthNode.geometry.firstMaterial.normal.intensity = 1.3;

            [self.textManager highlightBulletAtIndex:3];

            [self showCodeExample:@"material.#normal#.contents =" illustrationImageName:@"earth-bump"];

            break;

        case 8:

        {

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

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.7;

            _earthNode.geometry.firstMaterial.specular.intensity = 0.0;

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:2.0];

            [SCNTransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

            {

                _cameraOriginalPosition = presentationViewController.cameraHandle.position;

                presentationViewController.cameraHandle.position = [presentationViewController.cameraHandle convertPosition:SCNVector3Make(6, 0, -10.11) toNode:  presentationViewController.cameraHandle.parentNode];

            }

            [SCNTransaction commit];

            [self.textManager highlightBulletAtIndex:4];

            [self showCodeExample:@"material.#reflective#.contents =" illustrationImageName:@"earth-reflective"];

            break;

        }

        case 9:

        {

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            [SCNTransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

            {

                presentationViewController.cameraHandle.position = _cameraOriginalPosition;

            }

            [SCNTransaction commit];

            break;

        }

        case 10:

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

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.3;

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

            [self.textManager highlightBulletAtIndex:5];

            [self showCodeExample:@"material.#emission#.contents =" illustrationImageName:@"earth-emissive-mini2"];

            break;

        case 11:

            _earthNode.geometry.firstMaterial.emission.intensity = 1.0;

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.1;

            [self showCodeExample:nil illustrationImageName:nil];

            [presentationViewController updateLightingWithIntensities:@[@0.01]]; // keeping the intensity non null avoids an unnecessary shader recompilation

            break;

        case 12:

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.3;

            [presentationViewController updateLightingWithIntensities:self.lightIntensities];

            break;

        case 13:

            _earthNode.geometry.firstMaterial.emission.intensity = 0.0;

            _cloudsNode.opacity = 0.9;

            [self.textManager highlightBulletAtIndex:6];

            break;

        case 14:

        {

            // This effect can also be achieved with an image with some transparency set as the contents of the 'diffuse' property

            _cloudsNode.geometry.firstMaterial.transparent.contents = [NSImage imageNamed:@"cloudsTransparency"];

            _cloudsNode.geometry.firstMaterial.transparencyMode = SCNTransparencyModeRGBZero;

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:0];

            {

                _cloudsNode.geometry.firstMaterial.transparency = 0;

            }

            [SCNTransaction commit];

            _cloudsNode.geometry.firstMaterial.transparency = 1;

            [self showCodeExample:@"material.#transparent#.contents =" illustrationImageName:@"cloudsTransparency-mini"];

            break;

        }

        case 15:

            _earthNode.geometry.firstMaterial.multiply.contents = [NSColor colorWithDeviceRed:1.0 green:204/255.0 blue:102/255.0 alpha:1];

            [self.textManager highlightBulletAtIndex:7];

            [self showCodeExample:@"material.#mutliply#.contents = [NSColor yellowColor];" illustrationImageName:nil];

            break;

        case 16:

            _earthNode.geometry.firstMaterial.emission.intensity = 1.0;

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.1;

            [self showCodeExample:nil illustrationImageName:nil];

            [presentationViewController updateLightingWithIntensities:@[@0.01]];

            break;

        case 17:

            _earthNode.geometry.firstMaterial.emission.intensity = 0.0;

            _earthNode.geometry.firstMaterial.reflective.intensity = 0.3;

            [presentationViewController updateLightingWithIntensities:self.lightIntensities];

            break;

    }

    [SCNTransaction commit];

}

- (void)showCodeExample:(NSString *)code illustrationImageName:(NSString *)imageName {

    [SCNTransaction begin];

    [SCNTransaction setAnimationDuration:0];

    {

        [self.textManager fadeOutTextOfType:ASCTextTypeCode];

        if (code) {

            SCNNode *codeNode = [self.textManager addCode:code];

            SCNVector3 min, max;

            [codeNode getBoundingBoxMin:&min max:&max];

            if (imageName) {

                SCNNode *imageNode = [SCNNode asc_planeNodeWithImageNamed:imageName size:4.0 isLit:NO];

                imageNode.position = SCNVector3Make(max.x + 2.5, min.y + 0.2, 0);

                [codeNode addChildNode:imageNode];

                max.x += 4.0;

            }

            codeNode.position = SCNVector3Make(6 - (min.x + max.x) / 2, 10 - min.y, 0);

        }

    }

    [SCNTransaction commit];

}

@end