/**
 * Author: Bob Chen
 */

package com.jcommerce.gwt.server;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadServlet extends HttpServlet {    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {
    	String storeType = request.getParameter("storeType");
        response.setContentType("text/plain");
        PrintWriter writer = response.getWriter();
        List<String> names = null;

        //If you want to upload files of other types, you need to modify following codes.
        if("csv".equals(storeType) || "thumb".equals(storeType) || "img_thumb".equals(storeType) || "img".equals(storeType)){
        	names = readFiles(request, storeType);
        }else{
        	names = null;
        	System.out.println("-The storeType is not correct!(FileUploadServlet)-");
        }
		if (names != null) {
			for (String name : names) {
				writer.write(name + ";");
			}
		}
    }
    
	private List<String> readFiles(HttpServletRequest request, String storeType) {
        List<String> names = new ArrayList<String>();
        
        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        
        StoreOrderType sot = new StoreOrderType();
        try {
            String today = new SimpleDateFormat("yyMMdd").format(new Date());

            List items = upload.parseRequest(request);
            Iterator it = items.iterator();
            while (it.hasNext()) {
                FileItem item = (FileItem) it.next();
                String name = sot.StoreFile(storeType, item, today);
                if(name != null){
                	names.add(name);
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return names;
    }
}