/*
 * Copyright 2010 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.resources.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.junit.client.GWTTestCase;

/**
 * Tests for {@link DataResource.DoNotEmbed @DoNotEmbed} resource annotations.
 */
public class DataResourceDoNotEmbedTest extends GWTTestCase {

  interface Resources extends ClientBundle {

    /**
     * This is a binary file containing four 0x00 bytes, which is small enough
     * to be embeddable, and contains insufficient information for a
     * determination of a recognizable MIME Type.
     */
    String FOUR_ZEROS_SOURCE = "fourZeros.dat";

    // Purposely missing a @DoNotEmbed annotation
    @Source(FOUR_ZEROS_SOURCE)
    DataResource resourceDoNotEmbedAnnotationMissing();

    @DataResource.DoNotEmbed
    @Source(FOUR_ZEROS_SOURCE)
    DataResource resourceDoNotEmbedAnnotationPresent();
  }

  /**
   * RFC 2397 data URL scheme.
   */
  private static final String DATA_URL_SCHEME = "data:";

  /**
   * HACK: Older versions of IE do not support RFC 2397 data URLs. See
   * com/google/gwt/resources/Resources.gwt.xml
   */
  private static native boolean isPreIe8() /*-{
    // Stolen from UserAgentPropertyGenerator
    var ua = navigator.userAgent.toLowerCase();
    return ua.indexOf("msie") != -1
        && !($doc.documentMode >= 8);
  }-*/;

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

  public void testDoNotEmbedAnnotationMissingShouldEmbed() {
    if (isPreIe8()) {
      // Skip this test for browsers which do not support data URLs
      return;
    }
    Resources r = GWT.create(Resources.class);
    String url = r.resourceDoNotEmbedAnnotationMissing().getUrl();
    assertTrue("url '" + url + "' doesn't start with'" + DATA_URL_SCHEME + "'",
        url.startsWith(DATA_URL_SCHEME));
  }

  public void testDoNotEmbedAnnotationPresentShouldNotEmbed() {
    Resources r = GWT.create(Resources.class);
    String url = r.resourceDoNotEmbedAnnotationPresent().getUrl();
    assertFalse(
        "url '" + url + "' mustn't start with'" + DATA_URL_SCHEME + "'",
        url.startsWith(DATA_URL_SCHEME));
  }
}