package org.andengine.examples;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.AutoParallaxBackground;
import org.andengine.entity.scene.background.ParallaxBackground.ParallaxEntity;
import org.andengine.entity.sprite.AnimatedSprite;
import org.andengine.entity.sprite.Sprite;
import org.andengine.entity.util.FPSLogger;
import org.andengine.opengl.texture.TextureOptions;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
import org.andengine.opengl.texture.region.ITextureRegion;
import org.andengine.opengl.texture.region.TiledTextureRegion;
import org.andengine.opengl.vbo.VertexBufferObjectManager;
import org.andengine.ui.activity.SimpleBaseGameActivity;

/**
 * (c) 2010 Nicolas Gramlich
 * (c) 2011 Zynga
 *
 * @author Nicolas Gramlich
 * @since 19:58:39 - 19.07.2010
 */
public class AutoParallaxBackgroundExample extends SimpleBaseGameActivity {
 // ===========================================================
 // Constants
 // ===========================================================

 private static final int CAMERA_WIDTH = 720;
 private static final int CAMERA_HEIGHT = 480;

 // ===========================================================
 // Fields
 // ===========================================================

 private BitmapTextureAtlas mBitmapTextureAtlas;
 private TiledTextureRegion mPlayerTextureRegion;
 private TiledTextureRegion mEnemyTextureRegion;

 private BitmapTextureAtlas mAutoParallaxBackgroundTexture;

 private ITextureRegion mParallaxLayerBack;
 private ITextureRegion mParallaxLayerMid;
 private ITextureRegion mParallaxLayerFront;

 // ===========================================================
 // Constructors
 // ===========================================================

 // ===========================================================
 // Getter & Setter
 // ===========================================================

 // ===========================================================
 // Methods for/from SuperClass/Interfaces
 // ===========================================================

 @Override
 public EngineOptions onCreateEngineOptions() {
  final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

  return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
 }

 @Override
 public void onCreateResources() {
  BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
  
  this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 256, 128, TextureOptions.BILINEAR);
  this.mPlayerTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "player.png", 0, 0, 3, 4);
  this.mEnemyTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "enemy.png", 73, 0, 3, 4);
  this.mBitmapTextureAtlas.load();

  this.mAutoParallaxBackgroundTexture = new BitmapTextureAtlas(this.getTextureManager(), 1024, 1024);
  this.mParallaxLayerFront = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mAutoParallaxBackgroundTexture, this, "parallax_background_layer_front.png", 0, 0);
  this.mParallaxLayerBack = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mAutoParallaxBackgroundTexture, this, "parallax_background_layer_back.png", 0, 188);
  this.mParallaxLayerMid = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mAutoParallaxBackgroundTexture, this, "parallax_background_layer_mid.png", 0, 669);
  this.mAutoParallaxBackgroundTexture.load();
 }

 @Override
 public Scene onCreateScene() {
  this.mEngine.registerUpdateHandler(new FPSLogger());

  final Scene scene = new Scene();
  final AutoParallaxBackground autoParallaxBackground = new AutoParallaxBackground(0, 0, 0, 5);
  final VertexBufferObjectManager vertexBufferObjectManager = this.getVertexBufferObjectManager();
  autoParallaxBackground.attachParallaxEntity(new ParallaxEntity(0.0f, new Sprite(0, CAMERA_HEIGHT - this.mParallaxLayerBack.getHeight(), this.mParallaxLayerBack, vertexBufferObjectManager)));
  autoParallaxBackground.attachParallaxEntity(new ParallaxEntity(-5.0f, new Sprite(0, 80, this.mParallaxLayerMid, vertexBufferObjectManager)));
  autoParallaxBackground.attachParallaxEntity(new ParallaxEntity(-10.0f, new Sprite(0, CAMERA_HEIGHT - this.mParallaxLayerFront.getHeight(), this.mParallaxLayerFront, vertexBufferObjectManager)));
  scene.setBackground(autoParallaxBackground);

  /* Calculate the coordinates for the face, so its centered on the camera. */
  final float playerX = (CAMERA_WIDTH - this.mPlayerTextureRegion.getWidth()) / 2;
  final float playerY = CAMERA_HEIGHT - this.mPlayerTextureRegion.getHeight() - 5;

  /* Create two sprits and add it to the scene. */
  final AnimatedSprite player = new AnimatedSprite(playerX, playerY, this.mPlayerTextureRegion, vertexBufferObjectManager);
  player.setScaleCenterY(this.mPlayerTextureRegion.getHeight());
  player.setScale(2);
  player.animate(new long[]{200, 200, 200}, 3, 5, true);

  final AnimatedSprite enemy = new AnimatedSprite(playerX - 80, playerY, this.mEnemyTextureRegion, vertexBufferObjectManager);
  enemy.setScaleCenterY(this.mEnemyTextureRegion.getHeight());
  enemy.setScale(2);
  enemy.animate(new long[]{200, 200, 200}, 3, 5, true);

  scene.attachChild(player);
  scene.attachChild(enemy);

  return scene;
 }

 // ===========================================================
 // Methods
 // ===========================================================

 // ===========================================================
 // Inner and Anonymous Classes
 // ===========================================================
}