/*
 * Copyright 2011 Google Inc.
 * 
 * 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 com.google.gwt.animation.client;

import com.google.gwt.animation.client.AnimationScheduler.AnimationCallback;
import com.google.gwt.animation.client.AnimationScheduler.AnimationHandle;
import com.google.gwt.core.client.Duration;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.junit.client.GWTTestCase;
import com.google.gwt.user.client.Timer;

/**
 * Tests the {@link AnimationScheduler} class.
 */
public class AnimationSchedulerTest extends GWTTestCase {

  /**
   * The default timeout of asynchronous tests.
   */
  private static final int TEST_TIMEOUT = 60000;

  /**
   * Test maximum expected delay before the scheduler calls the callback. If the
   * browser tab does not have focus, the browser may dramatically reduce the
   * rate that timers fire, down to 1000ms.
   */
  private static final int TIMER_DELAY = 3000;

  private AnimationScheduler scheduler;

  @Override
  public String getModuleName() {
    return "com.google.gwt.animation.Animation";
  }

  public void testCancel() {
    delayTestFinish(TEST_TIMEOUT);
    AnimationHandle handle = scheduler.requestAnimationFrame(new AnimationCallback() {
      @Override
      public void execute(double timestamp) {
        fail("The animation frame was cancelled and should not execute.");
      }
    }, null);

    // Cancel the animation frame.
    handle.cancel();

    // Wait to make sure it doesn't execute.
    new Timer() {
      @Override
      public void run() {
        finishTest();
      }
    }.schedule(TIMER_DELAY);
  }

  public void testRequestAnimationFrame() {
    delayTestFinish(TEST_TIMEOUT);
    final double startTime = Duration.currentTimeMillis();
    DivElement element = Document.get().createDivElement();
    scheduler.requestAnimationFrame(new AnimationCallback() {
      @Override
      public void execute(double timestamp) {
        // Make sure timestamp is not a high-res timestamp (see issue 8570)
        assertTrue(timestamp >= startTime);
        finishTest();
      }
    }, element);
  }

  public void testRequestAnimationFrameWithoutElement() {
    delayTestFinish(TEST_TIMEOUT);
    final double startTime = Duration.currentTimeMillis();
    scheduler.requestAnimationFrame(new AnimationCallback() {
      @Override
      public void execute(double timestamp) {
        // Make sure timestamp is not a high-res timestamp (see issue 8570)
        assertTrue(timestamp >= startTime);
        finishTest();
      }
    }, null);
  }

  @Override
  protected void gwtSetUp() throws Exception {
    scheduler = AnimationScheduler.get();
  }

  @Override
  protected void gwtTearDown() throws Exception {
    scheduler = null;
  }
}