/**
 * 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.wavepanel.view.dom.full;

import com.google.common.base.Preconditions;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.StyleInjector;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.TextBox;

import org.waveprotocol.wave.client.common.util.WaveRefConstants;
import org.waveprotocol.wave.client.wavepanel.view.BlipLinkPopupView;
import org.waveprotocol.wave.client.widget.popup.AlignedPopupPositioner;
import org.waveprotocol.wave.client.widget.popup.PopupChrome;
import org.waveprotocol.wave.client.widget.popup.PopupChromeFactory;
import org.waveprotocol.wave.client.widget.popup.PopupEventListener;
import org.waveprotocol.wave.client.widget.popup.PopupEventSourcer;
import org.waveprotocol.wave.client.widget.popup.PopupFactory;
import org.waveprotocol.wave.client.widget.popup.UniversalPopup;

/**
 * Widget implementation of a blip link info popup.
 *
 * @author vega113@gmail.com (Yuri Z.)
 */
public final class BlipLinkPopupWidget extends Composite
    implements BlipLinkPopupView, PopupEventListener {

  interface Binder extends UiBinder<HTMLPanel, BlipLinkPopupWidget> {
  }

  /** Resources used by this widget. */
  public interface Resources extends ClientBundle {
    /** CSS */
    @Source("BlipLinkPopupWidget.css")
    Style style();
  }

  interface Style extends CssResource {

    String explanation();

    String link();
    
    String waverefLink();

    String self();

    String title();
  }

  private final static Binder BINDER = GWT.create(Binder.class);

  @UiField(provided = true)
  final static Style style = GWT.<Resources> create(Resources.class).style();

  static {
    // StyleInjector's default behaviour of deferred injection messes up
    // popups, which do synchronous layout queries for positioning. Therefore,
    // we force synchronous injection.
    StyleInjector.inject(style.getText(), true);
  }

  @UiField
  TextBox linkInfoBox;
  @UiField
  TextBox waverefLink;

  /** Popup containing this widget. */
  private final UniversalPopup popup;

  /** Optional listener for view events. */
  private Listener listener;

  /**
   * Creates link info popup.
   */
  public BlipLinkPopupWidget(Element relative) {
    initWidget(BINDER.createAndBindUi(this));
    // Wrap in a popup.
    PopupChrome chrome = PopupChromeFactory.createPopupChrome();
    popup = PopupFactory.createPopup(relative, AlignedPopupPositioner.ABOVE_RIGHT, chrome, true);
    popup.add(this);
    popup.addPopupEventListener(this);
  }

  @Override
  public void init(Listener listener) {
    Preconditions.checkState(this.listener == null);
    Preconditions.checkArgument(listener != null);
    this.listener = listener;
  }

  @Override
  public void reset() {
    Preconditions.checkState(this.listener != null);
    this.listener = null;
    linkInfoBox.setText(null);
  }

  @Override
  public void setLinkInfo(String url) {
    linkInfoBox.setText(url);
    String path = GWT.getHostPageBaseURL() + "waveref/" + url.substring(WaveRefConstants.WAVE_URI_PREFIX.length());
    waverefLink.setText(path);
  }

  @Override
  public void show() {
    popup.show();
  }

  @Override
  public void hide() {
    popup.hide();
  }

  @Override
  public void onShow(PopupEventSourcer source) {
    if (listener != null) {
      listener.onShow();
    }
    linkInfoBox.selectAll();
  }

  @Override
  public void onHide(PopupEventSourcer source) {
    if (listener != null) {
      listener.onHide();
    }
  }
}