package foundation.io.object;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

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

import foundation.dao.DataReader;
import foundation.server.config.Configer;
import foundation.util.Util;


public class UploadReader {

	private static int MaxFileSize = 1;
	private List<FileItemAgent> fileItemList;
	
	static {
		MaxFileSize = Configer.getInt("MaxFileSize", 10);
		MaxFileSize = MaxFileSize * 1024 * 1024;
	}
	
	public UploadReader(HttpServletRequest request) throws Exception {

	}

	public UploadReader(DataReader dataReader) throws Exception {
		//1. 
		fileItemList = new ArrayList<FileItemAgent>();
		
		//2. parse
		parse(dataReader);
	}

	private void parse(DataReader dataReader) throws Exception {
		HttpServletRequest request = dataReader.getRequest();
		
        DiskFileItemFactory factory = new DiskFileItemFactory();
        factory.setSizeThreshold(MaxFileSize);
        
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setFileSizeMax(MaxFileSize);
        upload.setSizeMax(MaxFileSize * 5);

        FileItemAgent fileForm = new FileItemAgent();
        fileItemList.add(fileForm);
        
        List<FileItem> items = upload.parseRequest(request);
        Iterator<FileItem> iterator = items.iterator();
        
        while (iterator.hasNext()) {
            FileItem item = (FileItem) iterator.next();
            
            String fieldName = item.getFieldName();
            if (Util.isEmpty(fieldName)) {
            	continue;
            }
            
            //1. load parameters
            if (item.isFormField()) {
                String value = item.getString("UTF-8");
                dataReader.loadOneParameter(fieldName, value);
                continue; 
            }
            
            //2. load files   
            fileForm.setFileItem(item);
        }
	}

	public FileItemAgent getFistFileItem() {
		if (fileItemList.isEmpty()) {
			return null;
		}
		
		return fileItemList.get(0);
	}
	
	public List<FileItemAgent> getFileItemList() {
		return fileItemList;
	}
}