/**
 * 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.box.webclient.widget.error;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.ClickEvent;
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.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;

import org.waveprotocol.wave.client.common.safehtml.SafeHtml;

/**
 * GWT implementation of the UI for an error indicator.
 */
public final class ErrorIndicatorWidget extends Composite implements ErrorIndicatorView {

  interface Binder extends UiBinder<HTMLPanel, ErrorIndicatorWidget> {
  }

  interface Style extends CssResource {
    // Css classes used by code.
    String expanded();

    // Classes not used by code, but forced to be declared thanks to UiBinder.
    String detail();

    String stack();
  }

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

  @UiField
  Style style;
  @UiField
  Anchor showDetail;
  @UiField
  Element detail;
  @UiField
  Element stack;
  @UiField
  Element bug;

  private Listener listener;


  private ErrorIndicatorWidget() {
    initWidget(BINDER.createAndBindUi(this));
  }

  public static ErrorIndicatorWidget create() {
    return new ErrorIndicatorWidget();
  }

  @Override
  public void init(Listener listener) {
    this.listener = listener;
  }

  @Override
  public void reset() {
    this.listener = null;
  }

  @UiHandler("showDetail")
  void handleClick(ClickEvent e) {
    if (listener != null) {
      listener.onShowDetailClicked();
    }
  }

  @Override
  public void setStack(SafeHtml stack) {
    this.stack.setInnerHTML(stack.asString());
  }

  @Override
  public void setBug(SafeHtml bug) {
    this.bug.setInnerHTML(bug.asString());
  }

  @Override
  public void showDetailLink() {
    showDetail.setVisible(true);
  }

  @Override
  public void hideDetailLink() {
    showDetail.setVisible(false);
  }

  @Override
  public void expandDetailBox() {
    detail.addClassName(style.expanded());
  }

  @Override
  public void collapseDetailBox() {
    detail.removeClassName(style.expanded());
  }
}