public interface Drawable {
    public void compileProgram();

    public Program getProgram();

    default public boolean isTessellated() {
        return false;
    }

    default public boolean isInstanced() {
        return false;
    }

    default public int getInstancesCount() {
        return 0;
    }

    public int getDataSize();

    public FloatBuffer putData(final FloatBuffer dataBuffer);

    public int getDataMode();

    public boolean isShadowReceiver();

    public boolean isShadowCaster();    //TODO use for AABB calculations

    default public void drawDepthPass(final int offset, final Program depthNormalProgram, final Program depthTessellationProgram) {
        Program depthProgram = (isTessellated()) ? depthTessellationProgram : depthNormalProgram;
        if (isInstanced()) {
            depthProgram.use().drawArraysInstanced(getDataMode(), offset, getDataSize(), getInstancesCount());
        }
        else {
            depthProgram.use().drawArrays(getDataMode(), offset, getDataSize());
        }
    }

    default public void draw(final int offset) {
        if (isInstanced()) {
            getProgram().use().drawArraysInstanced(getDataMode(), offset, getDataSize(), getInstancesCount());
        }
        else {
            getProgram().use().drawArrays(getDataMode(), offset, getDataSize());
        }
    }

    default public void delete() {
        getProgram().delete();
    }

    public static int countDataSize(final Collection<Drawable> drawables) {
        return drawables.stream()
                .mapToInt(Drawable::getDataSize)
                .sum();
    }

    public static FloatBuffer putAllData(final List<Drawable> drawables) {
        FloatBuffer dataBuffer = BufferUtils.createFloatBuffer(countDataSize(drawables) * 3);
        drawables.stream().forEachOrdered(drawable -> drawable.putData(dataBuffer));
        return (FloatBuffer)dataBuffer.clear();
    }

    public static void drawAllDepthPass(final List<Drawable> drawables, final Program depthNormalProgram, final Program depthTessellationProgram) {
        int offset = 0;
        for (Drawable drawable : drawables) {
            if (drawable.isShadowReceiver()) {
                drawable.drawDepthPass(offset, depthNormalProgram, depthTessellationProgram);
            }
            offset += drawable.getDataSize();   //TODO count offset only if not shadow receiver?
        }
    }

    public static void drawAll(final List<Drawable> drawables) {
        int offset = 0;
        for (Drawable drawable : drawables) {
            drawable.draw(offset);
            offset += drawable.getDataSize();
        }
    }

    public static void deleteAll(final List<Drawable> drawables) {
        drawables.stream().forEach(Drawable::delete);
    }
}

//---

public interface TessellatedDrawable extends Drawable {
    @Override
    default public boolean isTessellated() {
        return true;
    }
}

//---

public interface InstancedDrawable extends Drawable {
    @Override
    default public boolean isInstanced() {
        return true;
    }

    @Override
    public int getInstancesCount();
}

//---

public class Box implements TessellatedDrawable, InstancedDrawable {
    //<editor-fold defaultstate="collapsed" desc="keep-imports">
    static {
        int KEEP_LWJGL_IMPORTS = GL_2_BYTES | GL_ALIASED_LINE_WIDTH_RANGE | GL_ACTIVE_TEXTURE | GL_BLEND_COLOR | GL_ARRAY_BUFFER | GL_ACTIVE_ATTRIBUTE_MAX_LENGTH | GL_COMPRESSED_SLUMINANCE | GL_ALPHA_INTEGER | GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH | GL_ALREADY_SIGNALED | GL_ANY_SAMPLES_PASSED | GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH | GL_ACTIVE_PROGRAM | GL_ACTIVE_ATOMIC_COUNTER_BUFFERS | GL_ACTIVE_RESOURCES | GL_BUFFER_IMMUTABLE_STORAGE;
        int KEEP_OWN_IMPORTS = UNIFORM_PROJECTION_MATRIX.getLocation() | VS_POSITION.getLocation();
    }
//</editor-fold>
    private FloatBuffer data;
    private Program program;

    private final float width, height, depth;

    public Box(final float width, final float height, final float depth) {
        this.width = width;
        this.height = height;
        this.depth = depth;
        data = generateBox();
        data.clear();
    }

    @Override
    public void compileProgram() {
        program = new Program(
                new VertexShader("data/shaders/box.vs.glsl").compile(),
                new FragmentShader("data/shaders/box.fs.glsl").compile()
        ).compile().usingUniforms(
                        UNIFORM_MODEL_MATRIX,
                        UNIFORM_VIEW_MATRIX,
                        UNIFORM_PROJECTION_MATRIX,
                        UNIFORM_SHADOW_MATRIX
                        );
    }

    @Override
    public int getInstancesCount() {
        return 100;
    }

    @Override
    public Program getProgram() {
        return program;
    }

    @Override
    public int getDataSize() {
        return 6 * 6;
    }

    @Override
    public FloatBuffer putData(final FloatBuffer dataBuffer) {
        FloatBuffer returnData = dataBuffer.put(data);
        data.clear();   //clear to reset data state
        return returnData;
    }

    @Override
    public int getDataMode() {
        return GL_TRIANGLES;
    }

    @Override
    public boolean isShadowReceiver() {
        return true;
    }

    @Override
    public boolean isShadowCaster() {
        return true;
    }

    private FloatBuffer generateBox() {
        FloatBuffer boxData = BufferUtils.createFloatBuffer(6 * 6 * 3);

        float halfWidth = width / 2;
        float halfHeight = height / 2;
        float halfDepth = depth / 2;

        //calculate nodes
        float topN1X = -halfWidth;
        float topN1Y = halfHeight;
        float topN1Z = -halfDepth;

        float topN2X = -halfWidth;
        float topN2Y = halfHeight;
        float topN2Z = halfDepth;

        float topN3X = halfWidth;
        float topN3Y = halfHeight;
        float topN3Z = halfDepth;

        float topN4X = halfWidth;
        float topN4Y = halfHeight;
        float topN4Z = -halfDepth;

        float bottomN1X = -halfWidth;
        float bottomN1Y = -halfHeight;
        float bottomN1Z = -halfDepth;

        float bottomN2X = -halfWidth;
        float bottomN2Y = -halfHeight;
        float bottomN2Z = halfDepth;

        float bottomN3X = halfWidth;
        float bottomN3Y = -halfHeight;
        float bottomN3Z = halfDepth;

        float bottomN4X = halfWidth;
        float bottomN4Y = -halfHeight;
        float bottomN4Z = -halfDepth;

        //top face
        boxData
                .put(topN4X).put(topN4Y).put(topN4Z)    //first triangle
                .put(topN1X).put(topN1Y).put(topN1Z)
                .put(topN2X).put(topN2Y).put(topN2Z)
                .put(topN2X).put(topN2Y).put(topN2Z)    //second triangle
                .put(topN3X).put(topN3Y).put(topN3Z)
                .put(topN4X).put(topN4Y).put(topN4Z);

        //bottom face
        boxData
                .put(bottomN4X).put(bottomN4Y).put(bottomN4Z)    //first triangle
                .put(bottomN1X).put(bottomN1Y).put(bottomN1Z)
                .put(bottomN2X).put(bottomN2Y).put(bottomN2Z)
                .put(bottomN2X).put(bottomN2Y).put(bottomN2Z)   //second triangle
                .put(bottomN3X).put(bottomN3Y).put(bottomN3Z)
                .put(bottomN4X).put(bottomN4Y).put(bottomN4Z);

        //face from N1 to N2
        boxData
                .put(topN1X).put(topN1Y).put(topN1Z)            //first triangle
                .put(bottomN1X).put(bottomN1Y).put(bottomN1Z)
                .put(bottomN2X).put(bottomN2Y).put(bottomN2Z)
                .put(bottomN2X).put(bottomN2Y).put(bottomN2Z)   //second triangle
                .put(topN2X).put(topN2Y).put(topN2Z)
                .put(topN1X).put(topN1Y).put(topN1Z);

        //face from N2 to N3
        boxData
                .put(topN2X).put(topN2Y).put(topN2Z)            //first triangle
                .put(bottomN2X).put(bottomN2Y).put(bottomN2Z)
                .put(bottomN3X).put(bottomN3Y).put(bottomN3Z)
                .put(bottomN3X).put(bottomN3Y).put(bottomN3Z)   //second triangle
                .put(topN3X).put(topN3Y).put(topN3Z)
                .put(topN2X).put(topN2Y).put(topN2Z);

        //face from N3 to N4
        boxData
                .put(topN3X).put(topN3Y).put(topN3Z)            //first triangle
                .put(bottomN3X).put(bottomN3Y).put(bottomN3Z)
                .put(bottomN4X).put(bottomN4Y).put(bottomN4Z)
                .put(bottomN4X).put(bottomN4Y).put(bottomN4Z)   //second triangle
                .put(topN4X).put(topN4Y).put(topN4Z)
                .put(topN3X).put(topN3Y).put(topN3Z);

        //face from N4 to N1
        boxData
                .put(topN4X).put(topN4Y).put(topN4Z)            //first triangle
                .put(bottomN4X).put(bottomN4Y).put(bottomN4Z)
                .put(bottomN1X).put(bottomN1Y).put(bottomN1Z)
                .put(bottomN1X).put(bottomN1Y).put(bottomN1Z)   //second triangle
                .put(topN1X).put(topN1Y).put(topN1Z)
                .put(topN4X).put(topN4Y).put(topN4Z);

        return (FloatBuffer)boxData.clear();
    }
}