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/**
 * Copyright 2012 The PlayN Authors
 *
 * 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.
 */
package playn.android;

import java.util.List;

import android.graphics.Bitmap;

import pythagoras.f.MathUtil;

import playn.core.AsyncImage;
import playn.core.Image;
import playn.core.gl.GLContext;
import playn.core.gl.Scale;
import playn.core.util.Callback;
import playn.core.util.Callbacks;

public class AndroidAsyncImage extends AndroidImage implements AsyncImage {

  private List> callbacks;
  private Throwable error;
  private float preWidth, preHeight;

  public AndroidAsyncImage(GLContext ctx, float preWidth, float preHeight) {
    super(ctx, null, Scale.ONE);
    this.preWidth = preWidth;
    this.preHeight = preHeight;
  }

  @Override
  public float width() {
    return (bitmap == null) ? preWidth : super.width();
  }

  @Override
  public float height() {
    return (bitmap == null) ? preHeight : super.height();
  }

  @Override
  public void addCallback(Callback callback) {
    if (error != null)
      callback.onFailure(error);
    else if (bitmap != null)
      callback.onSuccess(this);
    else
      callbacks = Callbacks.createAdd(callbacks, callback);
  }

  @Override
  public void setImage(Bitmap bitmap, Scale scale) {
    this.bitmap = bitmap;
    this.scale = scale;
    callbacks = Callbacks.dispatchSuccessClear(callbacks, this);
  }

  @Override
  public void setError(Throwable error) {
    this.error = error;
    this.bitmap = createErrorBitmap(preWidth == 0 ? 50 : preWidth, preHeight == 0 ? 50 : preHeight);
    callbacks = Callbacks.dispatchFailureClear(callbacks, error);
  }

  private static Bitmap createErrorBitmap(float fwidth, float fheight) {
    int height = MathUtil.iceil(fheight), width = MathUtil.iceil(fwidth);
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
    android.graphics.Canvas c = new android.graphics.Canvas(bitmap);
    android.graphics.Paint p = new android.graphics.Paint();
    p.setColor(android.graphics.Color.RED);
    for (int yy = 0; yy <= height / 15; yy++) {
      for (int xx = 0; xx <= width / 45; xx++) {
        c.drawText("ERROR", xx * 45, yy * 15, p);
      }
    }
    return bitmap;
  }
}