package com.workflow.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;
import java.util.zip.ZipInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmConfiguration;
import org.jbpm.JbpmContext;
import org.jbpm.graph.def.ProcessDefinition;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
public class UploadServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void service(HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		response.setContentType("text/html");
		response.getWriter().println(handleRequest(request));
	}
	
	public void printInput(HttpServletRequest request) throws IOException {
		InputStream inputStream = request.getInputStream();
		StringBuffer buffer = new StringBuffer();
		int read;
		while ((read = inputStream.read()) != -1) {
			buffer.append((char)read);
		}
		log.debug(buffer.toString());
	}
	
	private String handleRequest(HttpServletRequest request) {
	    if (!FileUpload.isMultipartContent(request)) {
			log.debug("Not a multipart request");
	    	return "Not a multipart request";
	    }
		try {
		    DiskFileUpload fileUpload = new DiskFileUpload();
		    List list = fileUpload.parseRequest(request);
		    Iterator iterator = list.iterator();
		    if (!iterator.hasNext()) {
				log.debug("No process file in the request");
		    	return "No process file in the request";
		    }
		    FileItem fileItem = (FileItem)iterator.next();
		    if (fileItem.getContentType().indexOf("application/x-zip-compressed") == -1) {
				log.debug("Not a process archive");
		    	return "Not a process archive";
		    }
		    return doDeployment(fileItem,request);
		} catch (FileUploadException e) {
			e.printStackTrace();
			return "FileUploadException";
		}		
	}
	
	private String doDeployment(FileItem fileItem,HttpServletRequest request) {
		ApplicationContext ctx=WebApplicationContextUtils.getRequiredWebApplicationContext(request.getSession().getServletContext());
	    JbpmConfiguration jbpmConfiguration=(JbpmConfiguration) ctx.getBean("jbpmConfiguration");
		try {
		   ZipInputStream zipInputStream = new ZipInputStream(fileItem.getInputStream());
		   JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
		   if(jbpmContext==null)
		   {
			   jbpmContext=jbpmConfiguration.createJbpmContext();
		   }
		   ProcessDefinition processDefinition = ProcessDefinition.parseParZipInputStream(zipInputStream);	
		   log.debug("Created a processdefinition : " + processDefinition.getName() );
		   jbpmContext.deployProcessDefinition(processDefinition);
		   zipInputStream.close();
		   jbpmContext.close();
		   return "Deployed archive " + processDefinition.getName() + " successfully";
		} catch (IOException e) {
			return "IOException";
		}
	}
	
	  private static Log log = LogFactory.getLog(UploadServlet.class);

}