package net.sourceforge.solexatools.webapp.controller;

import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.seqware.common.model.File;
import net.sourceforge.seqware.common.util.filetools.ProvisionFilesUtil;
import net.sourceforge.solexatools.util.BulkUtil;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.BaseCommandController;

/**
 * <p>
 * BulkDownloaderSizeValidatorController class.
 * </p>
 * 
 * @author boconnor
 * @version $Id: $Id
 */
public class BulkDownloaderSizeValidatorController extends BaseCommandController {

    /**
     * {@inheritDoc}
     * 
     * @return
     * @throws java.lang.Exception
     */
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {

        ModelAndView modelAndView = new ModelAndView("Popup");
        try {

            List<File> filesToZip = BulkUtil.getFiles(request, "unknow");
            ProvisionFilesUtil util = new ProvisionFilesUtil();
            long size = determineSize(util, filesToZip);
            long maxSize = getMaxBulkDownloadFilesSize();
            if (size > maxSize) {
                throw new Exception("The files you have chosen to download total > " + maxSize
                        + " and cannot be zipped on this web server.  Please download individually.");
            }

        } catch (Exception e) {
            modelAndView.addObject("res", e.getMessage());
        }
        return modelAndView;
    }

    private long determineSize(ProvisionFilesUtil util, List<File> filesToZip) throws Exception {
        long size = 0;
        for (File file : filesToZip) {
            size += ProvisionFilesUtil.getFileSize(file.getFilePath());
        }
        return size;
    }

    private long getMaxBulkDownloadFilesSize() {
        ServletContext context = this.getServletContext();
        String maxSizeStr = context.getInitParameter("bulk.download.max.file.size");
        long maxSize = 200 * 1024 * 1024;
        try {
            maxSize = Integer.parseInt(maxSizeStr);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
        return maxSize;
    }
}