/**
 * Copyright 2011-2012 Universite Joseph Fourier, LIG, ADELE team
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
package fr.imag.adele.apam.distriman.web;

import java.io.IOException;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.felix.ipojo.annotations.Component;
import org.apache.felix.ipojo.annotations.Instantiate;
import org.apache.felix.ipojo.annotations.Invalidate;
import org.apache.felix.ipojo.annotations.Provides;
import org.apache.felix.ipojo.annotations.Requires;
import org.apache.felix.ipojo.annotations.Validate;
import org.osgi.service.http.HttpService;

import fr.imag.adele.apam.distriman.client.RemoteMachine;
import fr.imag.adele.apam.distriman.discovery.ApamMachineFactory;

@Component(name = "Apam::Distriman::Provider servlet")
@Instantiate
@Provides
public class DistrimanWeb extends HttpServlet implements Servlet, ServletConfig {

    private final static String URL = "/distriman";
    private final static String RESOURCE = "/static";

    @Requires(nullable = false)
    HttpService http;

    @Requires(nullable = false)
    ApamMachineFactory discovery;

    private String html = "<html><head><title>.:Apam - Distriman:.</title> <style type='text/css'>  body {    color: black;    background-color: #d8da3d; } table, tr {	border-style: dotted; }  </style></head><body><center><strong>Available apam remote nodes</strong><table>	<tr>		<td width='200px'>			URL		</td width='100px'>		<td>			IP		</td>		<td width='50px'>			Port		</td></tr>%s</table></center></body><html>";

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
	    throws ServletException, IOException {
	resp.setContentType("text/html");
	if (discovery != null) {

	    // try {
	    // service.connectCall();
	    // } catch (Exception e) {
	    // e.printStackTrace();
	    // }

	    String conteTemplate = "<tr><tr><td>%s</td><td>%s</td><td>%s</td><tr>";

	    String conte = "";

	    for (String key : discovery.getMachines().keySet()) {
		RemoteMachine machine = discovery.getMachines().get(key);
		conte += String.format(conteTemplate, machine.getURLServlet(),
			"NONE", "NONE");
	    }

	    if (discovery.getMachines().size() == 0) {
		conte += "<tr><td colspan='3' align='center'>No remote nodes available</td><tr>";
	    }

	    resp.getWriter().write(String.format(html, conte));

	} else {
	    resp.getWriter().write("empty discovery");
	}

	resp.flushBuffer();

    }

    @Validate
    private void initialize() {
	try {
	    http.registerServlet(URL, this, null, null);
	    http.registerResources(RESOURCE, "/", null);

	} catch (Exception e) {
	    e.printStackTrace();
	}
    }

    @Invalidate
    private void stop() {
	http.unregister(URL);
	http.unregister(RESOURCE);
    }
}