package tap.resource;

/*
 * This file is part of TAPLibrary.
 * 
 * TAPLibrary is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * TAPLibrary is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with TAPLibrary.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Copyright 2012 - UDS/Centre de Données astronomiques de Strasbourg (CDS)
 */

import java.io.IOException;
import java.io.PrintWriter;

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

import tap.ServiceConnection;

public class Availability implements TAPResource, VOSIResource {

	public static final String RESOURCE_NAME = "availability";

	private final ServiceConnection<?> service;
	protected String accessURL = getName();

	protected Availability(ServiceConnection<?> service){
		this.service = service;
	}

	public ServiceConnection<?> getService() {
		return service;
	}

	public final void setTAPBaseURL(String baseURL) {
		accessURL = ((baseURL==null)?"":(baseURL+"/"))+getName();
	}

	@Override
	public final String getName() { return RESOURCE_NAME; }

	@Override
	public final String getStandardID() { return "ivo://ivoa.net/std/VOSI#availability"; }

	@Override
	public final String getAccessURL() { return accessURL; }

	@Override
	public String getCapability() { return Capabilities.getDefaultCapability(this); }

	@Override
	public void init(ServletConfig config) throws ServletException { ; }

	@Override
	public void destroy() { ; }

	@Override
	public boolean executeResource(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		if (!request.getMethod().equalsIgnoreCase("GET"))	// ERREUR 405 selon VOSI (cf p.4)
			response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "The AVAILABILITY resource is only accessible in HTTP-GET !");

		response.setContentType("text/xml");

		String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
		xml += "<availability xmlns=\"http://www.ivoa.net/xml/VOSIAvailability/v1.0\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.ivoa.net/xml/VOSIAvailability/v1.0 http://www.ivoa.net/xml/VOSIAvailability/v1.0\">\n";
		xml += "\t<available>"+service.isAvailable()+"</available>\n\t<note>"+service.getAvailability()+"</note>\n";
		xml += "</availability>";

		PrintWriter pw = response.getWriter();
		pw.print(xml);
		pw.flush();

		return true;
	}

}