package obchallenge;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class EvaluateJavascript extends HttpServlet {

  private static final long serialVersionUID = 1L;

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    Connection connection = null;
    try {
      String script = request.getParameter("scriptJs");

      Class.forName("org.postgresql.Driver");
      connection = DriverManager.getConnection("jdbc:postgresql://" + Constants.DB_URL + ":"
          + Constants.DB_PORT + "/" + Constants.DB_SID, Constants.DB_USER, Constants.DB_PASSWORD);

      // create a script engine manager
      ScriptEngineManager factory = new ScriptEngineManager();
      ScriptEngine engine = factory.getEngineByName("JavaScript");
      // "var test = new Object(); test.suma = function Suma(num) { this.num = this.num; var result = num*2; print(result)}";
      engine.eval(script);

      Invocable inv = (Invocable) engine;
      Object obj = engine.get("test");
      inv.invokeMethod(obj, "suma", "21");

      // TODO: Devolver si OK o ERROR.
      response.setContentType("application/json");
      PrintWriter out = response.getWriter();
      out.print("{result:'success'}");

    } catch (Exception e) {
      System.out.println("Connection Failed! Check output console");
      e.printStackTrace();
      return;
    } finally {
      if (connection != null) {
        try {
          connection.close();
        } catch (SQLException e) {
          e.printStackTrace();
        }

      }
    }

  }
}