/*
 *
 * Copyright (C) 2007-2015 Licensed to the Comunes Association (CA) under
 * one or more contributor license agreements (see COPYRIGHT for details).
 * The CA licenses this file to you under the GNU Affero General Public
 * License version 3, (the "License"); you may not use this file except in
 * compliance with the License. This file is part of kune.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package cc.kune.gspace.client.ui.footer.license;

import cc.kune.core.client.events.StateChangedEvent;
import cc.kune.core.client.events.StateChangedEvent.StateChangedHandler;
import cc.kune.core.client.state.Session;
import cc.kune.core.client.state.StateManager;
import cc.kune.core.shared.dto.HasContent;
import cc.kune.core.shared.dto.LicenseDTO;
import cc.kune.core.shared.dto.StateAbstractDTO;
import cc.kune.core.shared.dto.StateContainerDTO;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.web.bindery.event.shared.EventBus;
import com.google.inject.Inject;
import com.gwtplatform.mvp.client.Presenter;
import com.gwtplatform.mvp.client.View;
import com.gwtplatform.mvp.client.annotations.ProxyCodeSplit;
import com.gwtplatform.mvp.client.proxy.Proxy;
import com.gwtplatform.mvp.client.proxy.RevealRootContentEvent;

// TODO: Auto-generated Javadoc
/**
 * The Class EntityLicensePresenter.
 * 
 * @author vjrj@ourproject.org (Vicente J. Ruiz Jurado)
 */
public class EntityLicensePresenter extends
    Presenter<EntityLicensePresenter.EntityLicenseView, EntityLicensePresenter.EntityLicenseProxy> {

  /**
   * The Interface EntityLicenseProxy.
   * 
   * @author vjrj@ourproject.org (Vicente J. Ruiz Jurado)
   */
  @ProxyCodeSplit
  public interface EntityLicenseProxy extends Proxy<EntityLicensePresenter> {
  }

  /**
   * The Interface EntityLicenseView.
   * 
   * @author vjrj@ourproject.org (Vicente J. Ruiz Jurado)
   */
  public interface EntityLicenseView extends View {

    /**
     * Attach.
     */
    void attach();

    /**
     * Detach.
     */
    void detach();

    /**
     * Gets the image.
     * 
     * @return the image
     */
    HasClickHandlers getImage();

    /**
     * Open window.
     * 
     * @param url
     *          the url
     */
    void openWindow(String url);

    /**
     * Show license.
     * 
     * @param groupName
     *          the group name
     * @param licenseDTO
     *          the license dto
     */
    void showLicense(String groupName, LicenseDTO licenseDTO);

  }

  /** The license. */
  private LicenseDTO license;

  /**
   * Instantiates a new entity license presenter.
   * 
   * @param eventBus
   *          the event bus
   * @param view
   *          the view
   * @param session
   *          the session
   * @param proxy
   *          the proxy
   * @param stateManager
   *          the state manager
   */
  @Inject
  public EntityLicensePresenter(final EventBus eventBus, final EntityLicenseView view,
      final Session session, final EntityLicenseProxy proxy, final StateManager stateManager) {
    super(eventBus, view, proxy);
    stateManager.onStateChanged(true, new StateChangedHandler() {
      @Override
      public void onStateChanged(final StateChangedEvent event) {
        final StateAbstractDTO state = event.getState();
        setState(state);
      }

    });
    final ClickHandler clickHandler = new ClickHandler() {
      @Override
      public void onClick(final ClickEvent event) {
        getView().openWindow(license.getUrl());
      }
    };
    getView().getImage().addClickHandler(clickHandler);
    eventBus.addHandler(LicenseChangedEvent.getType(), new LicenseChangedEvent.LicenseChangedHandler() {

      @Override
      public void onLicenseChanged(final LicenseChangedEvent event) {
        setState(session.getCurrentState());
      }
    });
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.gwtplatform.mvp.client.Presenter#revealInParent()
   */
  @Override
  protected void revealInParent() {
    RevealRootContentEvent.fire(this, this);
  }

  /**
   * Sets the license.
   * 
   * @param state
   *          the new license
   */
  private void setLicense(final StateContainerDTO state) {
    this.license = state.getLicense();
    getView().showLicense(state.getGroup().getShortName(), license);
    getView().attach();
  }

  /**
   * Sets the state.
   * 
   * @param state
   *          the new state
   */
  private void setState(final StateAbstractDTO state) {
    if (state instanceof HasContent) {
      setLicense((StateContainerDTO) state);
    } else {
      getView().detach();
    }
  }
}