package com.namazustudios.test.server;

import java.io.IOException;

import javax.jdo.JDOObjectNotFoundException;
import javax.jdo.PersistenceManager;
import javax.jdo.Transaction;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;

/**
 * The server side implementation of the RPC service.
 */
@SuppressWarnings("serial")
public class HelloWorld extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		TestDataObject tdo;
		final String name, foo, bar;
		PersistenceManager pm = PMF.get().getPersistenceManager();
		Transaction t = pm.currentTransaction();

		foo = getParameter(req, "foo", "foo");
		bar = getParameter(req, "bar", "bar");
		name = getParameter(req, "name", "default");

		t.begin();

		try {
			try {
				Key key = KeyFactory.createKey(TestDataObject.class
						.getSimpleName(), name);
				tdo = pm.getObjectById(TestDataObject.class, key);
			} catch (JDOObjectNotFoundException ex) {
				tdo = new TestDataObject(name);
			}

			tdo.foo = foo;
			tdo.bar = bar;
			tdo = pm.makePersistent(tdo);

			t.commit();

		} finally {
			if (t.isActive()) {
				t.rollback();
			}
		}

	}

	private String getParameter(HttpServletRequest req, String key, String def) {
		String val = req.getParameter(key);
		return val == null ? def : val;
	}
}