/*
 * Copyright (C) 2003-2007 eXo Platform SAS.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see<http://www.gnu.org/licenses/>.
 */
package org.exoplatform.ecm.webui.component.explorer.versions;

import javax.jcr.Node;
import javax.jcr.ReferentialIntegrityException;
import javax.jcr.version.Version;
import javax.jcr.version.VersionHistory;

import org.exoplatform.services.log.Log;
import org.exoplatform.ecm.jcr.model.VersionNode;
import org.exoplatform.ecm.webui.component.explorer.UIJCRExplorer;
import org.exoplatform.webui.core.UIPopupComponent;
import org.exoplatform.webui.core.UIPopupContainer;
import org.exoplatform.services.jcr.impl.storage.JCRInvalidItemStateException;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.web.application.ApplicationMessage;
import org.exoplatform.webui.config.annotation.ComponentConfig;
import org.exoplatform.webui.config.annotation.EventConfig;
import org.exoplatform.webui.core.UIApplication;
import org.exoplatform.webui.core.UIComponent;
import org.exoplatform.webui.core.UIContainer;
import org.exoplatform.webui.event.Event;
import org.exoplatform.webui.event.EventListener;

/**
 * Created by The eXo Platform SARL
 * Implement: lxchiati
 *            lebienthuy@gmail.com
 * July 3, 2006
 * 10:07:15 AM
 */

@ComponentConfig(
    template = "app:/groovy/webui/component/explorer/versions/UIVersionInfo.gtmpl",
    events = {
        @EventConfig(listeners = UIVersionInfo.SelectActionListener.class),
        @EventConfig(listeners = UIVersionInfo.RestoreVersionActionListener.class),        
        @EventConfig(listeners = UIVersionInfo.ViewVersionActionListener.class),
        @EventConfig(listeners = UIVersionInfo.AddLabelActionListener.class),
        @EventConfig(listeners = UIVersionInfo.CompareVersionActionListener.class),
        @EventConfig(listeners = UIVersionInfo.DeleteVersionActionListener.class, confirm = "UIVersionInfo.msg.confirm-delete"),
        @EventConfig(listeners = UIVersionInfo.RemoveLabelActionListener.class),
        @EventConfig(listeners = UIVersionInfo.CloseActionListener.class),
        @EventConfig(listeners = UIVersionInfo.CloseViewActionListener.class)
    }
)

public class UIVersionInfo extends UIContainer implements UIPopupComponent {

  protected VersionNode rootVersion_ ;
  protected VersionNode curentVersion_;
  protected Node node_ ;
  private static final Log LOG  = ExoLogger.getLogger("explorer.UIVersionInfo");
  public UIVersionInfo() throws Exception {
    addChild(UILabelForm.class, null, null).setRendered(false);   
    addChild(UIRemoveLabelForm.class, null, null).setRendered(false);
    addChild(UIViewVersion.class, null, null).setRendered(false);
    addChild(UIDiff.class, null, null).setRendered(false) ;
  }

  public String[] getVersionLabels(VersionNode version) throws Exception {
    VersionHistory vH = node_.getVersionHistory();
    return vH.getVersionLabels(version.getVersion());   
  }

  public boolean isBaseVersion(VersionNode versionNode) throws Exception {
    if( node_.getBaseVersion().getName().equals(versionNode.getVersion().getName())) return true ;
    return false ;
  }

  public VersionNode getRootVersionNode() throws Exception {  return rootVersion_ ; }

  public void activate() throws Exception {
    UIJCRExplorer uiExplorer = getAncestorOfType(UIJCRExplorer.class) ;
    node_ = uiExplorer.getCurrentNode() ;   
    rootVersion_ = new VersionNode(node_.getVersionHistory().getRootVersion(), uiExplorer.getSession()) ;
    curentVersion_ = rootVersion_ ;
    getChild(UIViewVersion.class).update() ;  
  }

  public void deActivate() throws Exception {}  

  public VersionNode getCurrentVersionNode() { return curentVersion_ ;}
  public Node getCurrentNode() { return node_ ; }
  
  public boolean isViewVersion() {
    UIViewVersion uiViewVersion = getChild(UIViewVersion.class);
    if(uiViewVersion.isRendered()) return true;
    return false;
  }  

  static  public class ViewVersionActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource();
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      uiVersionInfo.curentVersion_  = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;
      UIViewVersion uiViewVersion = uiVersionInfo.getChild(UIViewVersion.class) ;
      Version version_ = uiVersionInfo.curentVersion_.getVersion() ;
      Node frozenNode = version_.getNode("jcr:frozenNode") ;
      uiViewVersion.setNode(frozenNode) ;
      if(uiViewVersion.getTemplate() == null || uiViewVersion.getTemplate().trim().length() == 0) {
        UIApplication uiApp = uiVersionInfo.getAncestorOfType(UIApplication.class) ;
        uiApp.addMessage(new ApplicationMessage("UIVersionInfo.msg.have-no-view-template", null)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(uiApp.getUIPopupMessages()) ;
        return ;
      }  
      uiViewVersion.setRendered(true) ;
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
    }
  }

  static  public class AddLabelActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {      
      UIVersionInfo uiVersionInfo = event.getSource();
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      uiVersionInfo.curentVersion_  = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;      
      uiVersionInfo.getChild(UILabelForm.class).setRendered(true);
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
    }
  }

  static  public class RemoveLabelActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {      
      UIVersionInfo uiVersionInfo = event.getSource();
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      uiVersionInfo.curentVersion_  = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;      
      uiVersionInfo.getChild(UIRemoveLabelForm.class).update() ;
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
    }
  }

  static  public class RestoreVersionActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {      
      UIVersionInfo uiVersionInfo = event.getSource();
      UIJCRExplorer uiExplorer = uiVersionInfo.getAncestorOfType(UIJCRExplorer.class) ;
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      uiVersionInfo.curentVersion_  = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;
      UIApplication uiApp = uiVersionInfo.getAncestorOfType(UIApplication.class) ;
      uiExplorer.addLockToken(uiVersionInfo.node_);
      try {
        uiVersionInfo.node_.restore(uiVersionInfo.curentVersion_.getVersion(), true);
      } catch(JCRInvalidItemStateException invalid) {
        uiApp.addMessage(new ApplicationMessage("UIVersionInfo.msg.invalid-item-state", null, 
            ApplicationMessage.WARNING)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(uiApp.getUIPopupMessages()) ;
        return ;
      } catch(NullPointerException nuException){
        uiApp.addMessage(new ApplicationMessage("UIVersionInfo.msg.invalid-item-state", null, 
            ApplicationMessage.WARNING)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(uiApp.getUIPopupMessages()) ;
        return;
      } catch(Exception e) {
        //JCRExceptionManager.process(uiApp, e);        
        uiApp.addMessage(new ApplicationMessage("UIVersionInfo.msg.invalid-item-state", null, 
            ApplicationMessage.WARNING)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(uiApp.getUIPopupMessages()) ;
        return;
      }
      Node node = uiVersionInfo.getCurrentNode() ;
      if(!node.isCheckedOut()) node.checkout() ;
      uiExplorer.getSession().save() ;
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
      uiExplorer.setIsHidePopup(true) ;
      uiExplorer.updateAjax(event) ;
    }
  }

  static  public class DeleteVersionActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource();
      UIJCRExplorer uiExplorer = uiVersionInfo.getAncestorOfType(UIJCRExplorer.class) ;
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      uiVersionInfo.curentVersion_  = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;
      Node node = uiVersionInfo.getCurrentNode() ;
      VersionHistory versionHistory = node.getVersionHistory() ;
      UIApplication app = uiVersionInfo.getAncestorOfType(UIApplication.class) ;
      try {
        versionHistory.removeVersion(uiVersionInfo.curentVersion_ .getName());
        uiVersionInfo.rootVersion_.removeVersionInChild(uiVersionInfo.rootVersion_, uiVersionInfo.curentVersion_);
        uiVersionInfo.rootVersion_ = new VersionNode(node.getVersionHistory().getRootVersion(), uiExplorer.getSession()) ;
        uiVersionInfo.curentVersion_ = uiVersionInfo.rootVersion_ ;
        if(!node.isCheckedOut()) node.checkout() ;
        uiExplorer.getSession().save() ;
        event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo.getAncestorOfType(UIPopupContainer.class)) ;
      } catch (ReferentialIntegrityException rie) {
        LOG.error("Unexpected error", rie);
        app.addMessage(new ApplicationMessage("UIVersionInfo.msg.cannot-remove-version",null)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(app.getUIPopupMessages());
        return;
      } catch (Exception e) {
        LOG.error("Unexpected error", e);
        app.addMessage(new ApplicationMessage("UIVersionInfo.msg.cannot-remove-version",null)) ;
        event.getRequestContext().addUIComponentToUpdateByAjax(app.getUIPopupMessages());
        return;
      }
    }
  }

  static  public class CompareVersionActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource();
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        uiChild.setRendered(false) ;
      }
      String objectId = event.getRequestContext().getRequestParameter(OBJECTID) ;
      VersionNode node = uiVersionInfo.rootVersion_.findVersionNode(objectId) ;
      UIDiff uiDiff = uiVersionInfo.getChild(UIDiff.class) ;
      uiDiff.setVersions(uiVersionInfo.getCurrentNode().getBaseVersion(), node.getVersion()) ;
      uiDiff.setRendered(true) ;      
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
    }
  }

  static public class SelectActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource() ;
      String path = event.getRequestContext().getRequestParameter(OBJECTID) ;
      VersionNode root = uiVersionInfo.getRootVersionNode() ;
      VersionNode selectedVersion= root.findVersionNode(path);
      selectedVersion.setExpanded(!selectedVersion.isExpanded()) ;
      event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo) ;
    }
  } 

  static public class CloseActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource();
      for(UIComponent uiChild : uiVersionInfo.getChildren()) {
        if (uiChild.isRendered()) {
          uiChild.setRendered(false);
          return ;
        }
      }
      UIJCRExplorer uiExplorer = uiVersionInfo.getAncestorOfType(UIJCRExplorer.class) ;
      uiExplorer.cancelAction() ;
    }
  }
  
  static public class CloseViewActionListener extends EventListener<UIVersionInfo> {
    public void execute(Event<UIVersionInfo> event) throws Exception {
      UIVersionInfo uiVersionInfo = event.getSource();
      UIViewVersion uiViewVersion = uiVersionInfo.getChild(UIViewVersion.class);
      if(uiViewVersion.isRendered()) {
        uiViewVersion.setRendered(false);
        event.getRequestContext().addUIComponentToUpdateByAjax(uiVersionInfo);
        return;
      }
    }
  }  
}