package net.brutex.xservices.ws.rs;

import java.io.File;
import java.io.FileFilter;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;

import org.apache.jcs.JCS;
import org.apache.jcs.access.exception.CacheException;

import net.brutex.xservices.security.StandardSecurityManager;
import net.brutex.xservices.security.UserIdentity;
import net.brutex.xservices.types.FileInfoType;

/**
 * @author Brian Rosenberger
 *
 */
public class FileInfoImpl implements FileInfo {

	public Response getFiles(HttpHeaders h, String dir, boolean withDir,
			boolean withFiles, int level, String search, int count, int page) {
		
		StandardSecurityManager sec = new StandardSecurityManager();
		UserIdentity id = new UserIdentity();

		
		if( ! sec.canExecute(Thread.currentThread().getStackTrace()[1].getMethodName(), id)) {
			return null;
		}

		
		System.out.println("Listing directory: " + dir);
		if(level <= 0) level = 1;
		if(level > 3) level = 3;
		if(!withDir && !withFiles) withFiles = true;
		String cachekey = level +"||"+ withFiles +"||"+ withDir +"||" + search + "||" + dir;
		try {
			JCS jcs = JCS.getInstance("FileCache");
		
		List<FileInfoType> list = (List<FileInfoType>) jcs.get(cachekey);
		if(list == null) { 
			list = setDirectory(dir, withDir, withFiles, level, search);
			jcs.put(cachekey, list);
			System.out.println("Stored in Cache: " + list.toString());
		} else {
			System.out.println("Got from Cache: " + list.toString());
		}

		
		int fromIndex = 0;
		int toIndex = 0;
		fromIndex = (page-1) * count;
		toIndex = (page*count);
		if(toIndex>list.size()) toIndex = list.size();
		if(fromIndex>toIndex) fromIndex=toIndex;
		GenericEntity<List<FileInfoType>> sublist = new GenericEntity<List<FileInfoType>>(list.subList(fromIndex, toIndex) ){};
		return Response.ok( sublist ).build();
		} catch (CacheException e) {
			Response.serverError().build();
		}
		return null;
	}	


	
	private void setDirectory(List<FileInfoType> list, File dir, final boolean withDirectories, final boolean withFiles, final int depth, final String search) {
		if(depth <=0) return;
		
		File[] files = dir.listFiles(new FileFilter() {
			
			public boolean accept(File pathname) {
				if(pathname.isDirectory() && depth > 1) return true;
				if(search == null || search.equals("")) return true;
				if(!pathname.getAbsolutePath().contains(search)) return false;
				return true;
			}
		});
		if(dir.getParentFile() != null && withDirectories==true) 	list.add(new FileInfoType(dir.getParentFile()));
		if(files==null) return;
		
		for( File e : files) {
			if(e.isDirectory()) setDirectory(list, e, withDirectories, withFiles, depth-1, search);
			if( (withDirectories && e.isDirectory())
					|| (withFiles && e.isFile()) ) {
				list.add(new FileInfoType(e));
			}	
		}
	}
	
	private List<FileInfoType> setDirectory(String dir, final boolean withDirectories, final boolean withFiles, int depth, String search) {
		List<FileInfoType> list = new ArrayList<FileInfoType>();
		setDirectory( list, (new File(dir)), withDirectories, withFiles, depth, search);
		return list;
	}
	
	
	
}