import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
//TODO import Dao, member, DBConnection etc...


/**
 * In current implementation login is handled from client side, for productivity sake and its temporary.
 * Rpc Servlet communicates with post requests with UDAS database client in JSON format:
 *
 *  {key : {param1, param2}}
 *
 * Where params can be valid json objects too or lists
 */
public class RpcServlet extends HttpServlet{

    DataAdapter sqlAdapter = new MySqlAdapter();
    String databaseUser = "root";
    String databasePassword = "";

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException{
        doPost(request, response);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException{

        response.setContentType("text/html");

        //This whole connection manager thing is stupid - TODO in version two alongside with token login system
        ConnectionManager.connect(username, password);

        JSONOBject responseAsJSON = toJSONObject(request.getReader());

        //TODO get first key from json object
        String command = "a"; // responseAsJSON.getKey();

        switch(command){

            case "addMember": // For example - name has to be same as in DAO
                Member newMember = jsonToMemberObject(jsonResponse.getValue());
                boolean succeed = sqlAdapter.addMember(newMember);
                //buildResponse(command, succeed); //TODO

                break;
            case "TODO":
                //rest of commands
                break;

                // ...

            default:
                //malformed command response failed or something!
        }

    }

    /**
     * TODO try-with-hecking-resources !
     *  Also belongs to some utility class
     * @param reader
     * @return
     */
    public JSONObject toJSONObject(BufferedReader reader){
        StringBuffer jb = new StringBuffer();
        String line = null;
        try {

          while ((line = reader.readLine()) != null)
            jb.append(line);
        } catch (Exception e) { /*report an error*/ }

        try {
          JSONObject jsonObject =  HTTP.toJSONObject(jb.toString());
        } catch (JSONException e) {
          // crash and burn
          throw new IOException("Error parsing JSON request string");
        }
    }

}