/*
    * Copyright 2006 Thomas Peuss
    * 
    * 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 logtail.beans;
  
  import java.io.File;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.TimeZone;
  
  import javax.faces.application.Application;
  import javax.faces.context.ExternalContext;
  import javax.faces.context.FacesContext;
  import javax.faces.model.DataModel;
  import javax.faces.model.ListDataModel;
  import javax.servlet.http.HttpSession;
  import javax.servlet.http.HttpSessionBindingEvent;
  import javax.servlet.http.HttpSessionBindingListener;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import logtail.logfile.LogfileDescriptor;
  import logtail.logfile.LogfileManager;
  
  public class LogfilesBean implements HttpSessionBindingListener {
  	private static final Log log=LogFactory.getLog(LogfilesBean.class);
  	private DataModel logfilesModel;
  	private Map tailLogDescriptors;
  	private int maxLogLines;
  	
  	public LogfilesBean() {
  		tailLogDescriptors=new HashMap();
  		loadLogfiles();
  		log.debug("Initialized. "+this.getLogfiles().size()+" logfiles found");
  	}
  
  	public String rescan() {
  		log.debug("Rescan of logs triggered");
  		loadLogfiles();
  		return "reload";
  	}
  	
  	public String logout() {
  		FacesContext context = FacesContext.getCurrentInstance();
  		
  		HttpSession session=(HttpSession)context.getExternalContext().getSession(true);
  		
  		session.invalidate();
  		
  		return "loggedout";
  	}
  
  	public String sortAsc() {
  		List logfiles=(List)logfilesModel.getWrappedData();
  		Collections.sort(logfiles,new Comparator() {
  			public int compare(Object arg0, Object arg1) {
  				File f1=(File)arg0;
  				File f2=(File)arg1;
  				
  				if (f1==f2) {
  					return 0;
  				}
  				
  				if (f1.lastModified()<f2.lastModified()) {
  					return -1;
  				} else {
  					return 1;
  				}
  			}
  		});
  		
  		setLogfiles(logfiles);
  
  		return "reload";
  	}
  	
  	public String sortDesc() {
  		List logfiles=(List)logfilesModel.getWrappedData();
  		Collections.sort(logfiles,new Comparator() {
  			public int compare(Object arg0, Object arg1) {
  				File f1=(File)arg0;
  				File f2=(File)arg1;
 				
 				if (f1==f2) {
 					return 0;
 				}
 				
 				if (f1.lastModified()<f2.lastModified()) {
 					return 1;
 				} else {
 					return -1;
 				}
 			}
 		});
 		
 		setLogfiles(logfiles);
 
 		return "reload";
 	}
 	
 	protected void loadLogfiles() {
 		FacesContext context = FacesContext.getCurrentInstance();
 		String logs=context.getExternalContext().getInitParameter("logs");
 		
 		closeTailLogDescriptors();
 		this.tailLogDescriptors=new HashMap();
 		this.setLogfiles(LogfileManager.getLogfiles());		
 	}
 
 	public static LogfilesBean getLogfilesBean() {
 		FacesContext context = FacesContext.getCurrentInstance();
         Application application=context.getApplication();
         return (LogfilesBean)application.createValueBinding("#{LogfilesBean}").getValue(context);		
 	}
 	
 	public static ExternalContext getExternalContext() {
 		return FacesContext.getCurrentInstance().getExternalContext();
 	}
 	
 	public List getLogfiles() {
 		return (List)logfilesModel.getWrappedData();
 	}
 
 	public void setLogfiles(List logfiles) {
 		this.logfilesModel=new ListDataModel(logfiles);
 	}
 
 	public Map getTailLogDescriptors() {
 		return tailLogDescriptors;
 	}
 
 	public void setTailLogDescriptors(Map tailLogDescriptors) {
 		this.tailLogDescriptors = tailLogDescriptors;
 	}
 	
 	protected void closeTailLogDescriptors() {
 		Iterator iter=tailLogDescriptors.keySet().iterator();
 		
 		while (iter.hasNext()) {
 			String id=(String)iter.next();
 			LogfileDescriptor desc=(LogfileDescriptor)tailLogDescriptors.get(id);
 			desc.closeRAFile();
 		}
 	}
 
 	public DataModel getLogfilesModel() {
 		return logfilesModel;
 	}
 
 	public void setLogfilesModel(DataModel logfilesModel) {
 		this.logfilesModel = logfilesModel;
 	}
 
 	public boolean isLoggedIn() {
 		FacesContext context = FacesContext.getCurrentInstance();
 		if(context.getExternalContext().getRemoteUser()==null) {
 			return false;
 		} else {
 			return true;
 		}
 	}
 	
 	public void valueBound(HttpSessionBindingEvent event) {
 		// Do nothing
 	}
 
 	public void valueUnbound(HttpSessionBindingEvent event) {
 		// Remove all open LogfileDescriptors
 		closeTailLogDescriptors();
 	}
 
 	public int getMaxLogLines() {
 		return maxLogLines;
 	}
 
 	public void setMaxLogLines(int maxLogLines) {
 		this.maxLogLines = maxLogLines;
 	}
 	
 	public TimeZone getTimeZone() {
 		return TimeZone.getDefault();
 	}
 }