/**
 * 
 */
package org.gcube.portlets.user.workspace;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * @author Francesco Mangiacrapa francesco.mangiacrapa{@literal @}isti.cnr.it
 * Jun 4, 2013
 *
 */
public class UrlEncoderUtil {
	
	public static String charset = "UTF-8";
	
	public static Logger logger = Logger.getLogger(UrlEncoderUtil.class);
	/**
	 * 
	 * @param url
	 * @param parameters
	 * @return
	 */
	public static String encodeQuery(String... parameters){
		
		String query = "";
		for (String string : parameters) {
			
			try {
				query+=URLEncoder.encode(string, charset)+"&";
			} catch (UnsupportedEncodingException e) {
				logger.error(e);
				return query;
			}
			
		}
		return removeLastChar(query);
	}
	
	
	
	/**
	 * 
	 * @param url
	 * @param parameters
	 * @return
	 */
	public static String encodeQuery(Map<String, String> parameters){
		
		String query = "";
		
		if(parameters==null)
			return query;
		
		for (String key : parameters.keySet()) {
			
			try {
				
				query+=String.format(key+"=%s", URLEncoder.encode(parameters.get(key), charset))+"&";
			} catch (UnsupportedEncodingException e) {
				logger.error(e);
				return query;
			}
			
		}

		return removeLastChar(query);
		
	}
	
	public static String removeLastChar(String string){
		
		if(string == null)
			return null;
		
		if(string.length()>0)
			return string.substring(0, string.length()-1);
		
		return string;
	}
	
	public static void main(String[] args) {
		
//		System.out.println(UrlEncoderUtil.encodeQuery("request=GetStyles", "layers=test Name", "service=WMS", "version=1.1.1"));
		
		HashMap<String, String> parameters = new HashMap<String, String>();
		
		parameters.put("request", "GetStyles");
		parameters.put("layers", "test Name");
		parameters.put("version", "1.1.1");
		
		System.out.println(UrlEncoderUtil.encodeQuery(parameters));
		
		
	}


}