/**
 * 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 org.waveprotocol.wave.client.gadget;

import static org.waveprotocol.wave.model.gadget.GadgetConstants.TAGNAME;

import org.waveprotocol.wave.client.account.ProfileManager;
import org.waveprotocol.wave.client.doodad.DoodadInstallers;
import org.waveprotocol.wave.client.doodad.DoodadInstallers.BlipInstaller;
import org.waveprotocol.wave.client.editor.ElementHandlerRegistry;
import org.waveprotocol.wave.client.editor.content.ContentNode;
import org.waveprotocol.wave.client.editor.content.Registries;
import org.waveprotocol.wave.client.editor.content.misc.ChunkyElementHandler;
import org.waveprotocol.wave.client.editor.util.EditorDocHelper;
import org.waveprotocol.wave.client.gadget.renderer.GadgetRenderer;
import org.waveprotocol.wave.model.conversation.Conversation;
import org.waveprotocol.wave.model.conversation.ConversationBlip;
import org.waveprotocol.wave.model.gadget.GadgetConstants;
import org.waveprotocol.wave.model.id.WaveletName;
import org.waveprotocol.wave.model.supplement.ObservableSupplementedWave;
import org.waveprotocol.wave.model.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.Wavelet;

/**
 * Class for embedding IFrame-based gadgets in the editor.
 *
 */
public final class Gadget {

  private Gadget() {
  } // Non-instantiable.

  /**
   * Registers subclass with ContentElement
   */
  public static void register(ElementHandlerRegistry registry, WaveletName waveletName,
      ConversationBlip blip, ObservableSupplementedWave supplement, ProfileManager profileManager,
      String loginName) {

    GadgetRenderer renderer =
        new GadgetRenderer(waveletName, blip, supplement, profileManager, loginName);

    registry.registerEventHandler(TAGNAME, ChunkyElementHandler.INSTANCE);
    registry.registerRenderingMutationHandler(TAGNAME, renderer);
  }

  public static boolean isGadget(ContentNode node) {
    return EditorDocHelper.isNamedElement(node, GadgetConstants.TAGNAME);
  }

  public static BlipInstaller install(final ProfileManager profileManager,
      final ObservableSupplementedWave supplement, final ParticipantId signedInUser) {
    return new DoodadInstallers.BlipInstaller() {
      @Override
      public void install(Wavelet w, Conversation c, ConversationBlip b, Registries r) {
        WaveletName name = WaveletName.of(w.getWaveId(), w.getId());
        register(r.getElementHandlerRegistry(), name, b, supplement, profileManager,
            signedInUser.getAddress());
      }
    };
  }
}