package me.neurodock.genius;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Map;

public class ParameterStringBuilder {
    public static String getParamsString(Map<String, String> params) 
      throws UnsupportedEncodingException {
        if(params == null)
            return "";
        StringBuilder result = new StringBuilder();

        for (Map.Entry<String, String> entry : params.entrySet()) {
          result.append(URLEncoder.encode(entry.getKey(), StandardCharsets.UTF_8));
          result.append("=");
          result.append(URLEncoder.encode(entry.getValue(), StandardCharsets.UTF_8));
          result.append("&");
        }

        String resultString = result.toString();
        return !resultString.isEmpty()
          ? resultString.substring(0, resultString.length() - 1)
          : resultString;
    }
}