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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package org.glassfish.jersey.server.wadl.internal;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;

import javax.inject.Singleton;
import javax.xml.bind.Marshaller;

import org.glassfish.jersey.internal.ProcessingException;
import org.glassfish.jersey.server.internal.LocalizationMessages;
import org.glassfish.jersey.server.wadl.WadlApplicationContext;

import com.sun.research.ws.wadl.Application;

/**
 *
 * @author Paul Sandoz (paul.sandoz at oracle.com)
 */
@Singleton
@Path("application.wadl")
public final class WadlResource {

    public static final String HTTPDATEFORMAT = "EEE, dd MMM yyyy HH:mm:ss zzz";

    private URI lastBaseUri;
    private byte[] wadlXmlRepresentation;
    private String lastModified;

    @Context
    private WadlApplicationContext wadlContext;


    public WadlResource() {
        this.lastModified = new SimpleDateFormat(HTTPDATEFORMAT).format(new Date());
    }

    @Produces({"application/vnd.sun.wadl+xml", "application/xml"})
    @GET
    public synchronized Response getWadl(@Context UriInfo uriInfo) {
        try {
            if (!wadlContext.isWadlGenerationEnabled()) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }

            if ((wadlXmlRepresentation == null) || ((lastBaseUri != null) && !lastBaseUri.equals(uriInfo.getBaseUri()))) {
                this.lastBaseUri = uriInfo.getBaseUri();
                this.lastModified = new SimpleDateFormat(HTTPDATEFORMAT).format(new Date());

                ApplicationDescription applicationDescription =
                        wadlContext.getApplication(uriInfo);
                Application application = applicationDescription.getApplication();

                try {
                    final Marshaller marshaller = wadlContext.getJAXBContext().createMarshaller();
                    marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
                    final ByteArrayOutputStream os = new ByteArrayOutputStream();
                    marshaller.marshal(application, os);
                    wadlXmlRepresentation = os.toByteArray();
                    os.close();
                } catch (Exception e) {
                    throw new ProcessingException("Could not marshal the wadl Application.", e);
                }
            }

            return Response.ok(new ByteArrayInputStream(wadlXmlRepresentation)).header("Last-modified", lastModified).build();
        } catch (Exception e) {
            throw new ProcessingException("Error generating /application.wadl.", e);
        }
    }

    @Produces({"application/xml"})
    @GET
    @Path("{path}")
    public synchronized Response geExternalGrammar(
            @Context UriInfo uriInfo,
            @PathParam("path") String path) {
        try {
            // Fail if wadl generation is disabled
            if (!wadlContext.isWadlGenerationEnabled()) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }

            ApplicationDescription applicationDescription =
                    wadlContext.getApplication(uriInfo);

            // Fail is we don't have any metadata for this path
            ApplicationDescription.ExternalGrammar externalMetadata = applicationDescription.getExternalGrammar(path);

            if (externalMetadata == null) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }

            // Return the data
            return Response.ok().type(externalMetadata.getType())
                    .entity(externalMetadata.getContent())
                    .build();
        } catch (Exception e) {
            throw new ProcessingException(LocalizationMessages.ERROR_WADL_RESOURCE_EXTERNAL_GRAMMAR(), e);
        }
    }
}