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package org.frameworkset.cache;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.frameworkset.util.DaemonThread;
import com.frameworkset.util.FileUtil;
import com.frameworkset.util.ResourceInitial;
import com.frameworkset.util.SimpleStringUtil;
import com.frameworkset.util.UUIDResource;

public class FileContentCache  
{
	private static Method shutdownMethod ;
	static 
	{
		try
		{
			Class clazz = Class.forName("org.frameworkset.spi.BaseApplicationContext");
			shutdownMethod = clazz.getMethod("addShutdownHook",Runnable.class);
		}
		catch(RuntimeException e)
		{
			
		}
		catch(Exception e)
		{
			
		}
		catch(Throwable e)
		{
			
		}
	}
	private static Logger log = LoggerFactory.getLogger(FileContentCache.class);
	private Map democontentCache = new HashMap();	
	public static final int HTMLNoBREncode  = 0;
	public static final int HTMLEncode  = 1;
	public static final int PLAINEncode  = 2;
	public static final int HTMLEncodej  = 3;
	private String _getFileContent(String path,String charset,int encodeType)
	{
		String content = "";
		try
		{
			if(encodeType == HTMLNoBREncode)
				content = SimpleStringUtil.HTMLNoBREncode(FileUtil.getFileContent(path,charset));
			else if(encodeType == HTMLEncode)
				content = SimpleStringUtil.HTMLEncode(FileUtil.getFileContent(path,charset));
			else  if(encodeType == HTMLEncodej)
				content = SimpleStringUtil.HTMLEncodej(FileUtil.getFileContent(path,charset));
			else				
				content = FileUtil.getFileContent(path,charset);
		}
		catch (IOException e)
		{
			log.error("Get File Content Error:path="+path+",charset="+charset+",convertHtmlTag="+encodeType,e);
		}
		return content;
	}
	
	private Object lock = new Object();
	/**
	 * 
	 * @param path
	 * @param charset
	 * @param encodeType 
	 * 			FileContentCache.HTMLNoBREncode
	 * 			FileContentCache.HTMLEncode
	 * 			FileContentCache.PLAINEncode
	 *	 		FileContentCache.HTMLEncodej
	 * @return
	 */
	public String getFileContent(String path,String charset,int encodeType)
	{
		
		String key = path + "|" + charset + "|" + encodeType;
		String content = democontentCache.get(key);
		if(content != null)
			return content;
		else
		{
			synchronized(lock)
			{
				content = democontentCache.get(key);
				if(content != null)
					return content;
				content = _getFileContent(path,charset, encodeType);
				democontentCache.put(key, content);
				damon.addFile(path, new ResourceCacheRefresh(key ));
			}			
		}
		
		return content;
	}
	private void removecache(String cachekey)
	{
		synchronized(lock)
		{
			this.democontentCache.remove(cachekey);
		}
	}
	private DaemonThread damon = null; 
	private long refreshInterval= 5000;
	
	 
	
	 class ResourceCacheRefresh implements ResourceInitial,UUIDResource
	{
		private String cachekey;
		public ResourceCacheRefresh(String cachekey)
		{
			this.cachekey =cachekey;
		}
		public void reinit() {
			removecache(cachekey);
		}
		@Override
		public String getUUID() {
			
			return cachekey;
		}
		
	}



	public void start(String name) throws Exception
	{
		damon = new DaemonThread(refreshInterval,"FileContentCache Refresh Monitor Worker for "+ name); 
		damon.start();
		if(shutdownMethod != null)
		{
			shutdownMethod.invoke(null, new Runnable(){

				@Override
				public void run() {
					try {
						destroy();
					} catch(RuntimeException e)
					{
						log.warn("",e);
					}
					catch(Exception e)
					{
						log.warn("",e);
					}
					catch(Throwable e)
					{
						log.warn("",e);
					}
					
				}
				
			});
		}
		
	}
	public void start() throws Exception
	{
		damon = new DaemonThread(refreshInterval,"FileContentCache Refresh Monitor Worker"); 
		damon.start();
		
	}
	
	public long getRefreshInterval()
	{
	
		return refreshInterval;
	}
	
	public void setRefreshInterval(long refreshInterval)
	{
	
		this.refreshInterval = refreshInterval;
	}
	 
	public void destroy() throws Exception {
		if(damon != null)
		{
			damon.stopped();
			damon = null;
		}
		
	}

}