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/**
 * Copyright 2011 ArcBees 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.gwtplatform.mvp.client;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.user.client.Window;
import com.google.web.bindery.event.shared.EventBus;
import com.google.web.bindery.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.PopupPanel;
import com.gwtplatform.mvp.client.proxy.NavigationEvent;
import com.gwtplatform.mvp.client.proxy.NavigationHandler;

/**
 * A simple implementation of {@link PopupView} that can be used when the widget
 * returned by {@link #asWidget()} inherits from {@link PopupPanel}.
 *
 * Also, this implementation simply disregards every call to
 * {@link #setInSlot(Object, com.google.gwt.user.client.ui.Widget)}, {@link #addToSlot(Object, com.google.gwt.user.client.ui.Widget)}, and
 * {@link #removeFromSlot(Object, com.google.gwt.user.client.ui.Widget)}.
 *
 * @author Philippe Beaudoin
 */
public abstract class PopupViewImpl extends ViewImpl implements PopupView {

  private HandlerRegistration autoHideHandler;

  private HandlerRegistration closeHandlerRegistration;
  private final EventBus eventBus;

  /**
   * The {@link PopupViewImpl} class uses the {@link EventBus} to listen to
   * {@link NavigationEvent} in order to automatically close when this event is
   * fired, if desired. See
   * {@link #setAutoHideOnNavigationEventEnabled(boolean)} for details.
   *
   * @param eventBus The {@link EventBus}.
   */
  protected PopupViewImpl(EventBus eventBus) {
    this.eventBus = eventBus;
  }

  @Override
  public void center() {
    doCenter();
    // We center again in a deferred command to solve a bug in IE where newly
    // created window are sometimes not centered.
    Scheduler.get().scheduleDeferred(new Command() {
      @Override
      public void execute() {
        doCenter();
      }
    });
  }

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

  @Override
  public void setAutoHideOnNavigationEventEnabled(boolean autoHide) {
    if (autoHide) {
      if (autoHideHandler != null) {
        return;
      }
      autoHideHandler = eventBus.addHandler(NavigationEvent.getType(),
          new NavigationHandler() {
            @Override
            public void onNavigation(NavigationEvent navigationEvent) {
              hide();
            }
          });
    } else {
      if (autoHideHandler != null) {
        autoHideHandler.removeHandler();
      }
    }
  }

  @Override
  public void setCloseHandler(final PopupViewCloseHandler popupViewCloseHandler) {
    if (closeHandlerRegistration != null) {
      closeHandlerRegistration.removeHandler();
    }
    if (popupViewCloseHandler == null) {
      closeHandlerRegistration = null;
    } else {
      closeHandlerRegistration = asPopupPanel().addCloseHandler(
          new CloseHandler() {
            @Override
            public void onClose(CloseEvent event) {
              popupViewCloseHandler.onClose();
            }
          });
    }
  }

  @Override
  public void setPosition(int left, int top) {
    asPopupPanel().setPopupPosition(left, top);
  }

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

  /**
   * Retrieves this view as a {@link PopupPanel}. See {@link #asWidget()}.
   *
   * @return This view as a {@link PopupPanel} object.
   */
  protected PopupPanel asPopupPanel() {
    return (PopupPanel) asWidget();
  }

  /**
   * This method centers the popup panel, temporarily making it visible if
   * needed.
   */
  private void doCenter() {
    // We can't use Element.center() method as it will show the popup
    // by default and not only centering it. This is resulting in onAttach()
    // being called twice when using setInSlot() or addToPopupSlot() in PresenterWidget

    // If left/top are set from a previous doCenter() call, and our content
    // has changed, we may get a bogus getOffsetWidth because our new content
    // is wrapping (giving a lower offset width) then it would without the
    // previous left. Clearing left/top to avoids this.
    PopupPanel popup = asPopupPanel();
    Element elem = popup.getElement();
    elem.getStyle().clearLeft();
    elem.getStyle().clearTop();

    int left = (Window.getClientWidth() - popup.getOffsetWidth()) >> 1;
    int top = (Window.getClientHeight() - popup.getOffsetHeight()) >> 1;
    popup.setPopupPosition(Math.max(Window.getScrollLeft() + left, 0), Math.max(
        Window.getScrollTop() + top, 0));
  }
}