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package com.sun.jersey.server.impl.wadl;

import com.sun.jersey.server.wadl.ApplicationDescription;
import com.sun.jersey.server.wadl.WadlApplicationContext;
import com.sun.jersey.spi.resource.Singleton;
import com.sun.research.ws.wadl.Application;

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.xml.bind.Marshaller;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author [email protected]
 */
@Singleton
public final class WadlResource {

    public static final String HTTPDATEFORMAT = "EEE, dd MMM yyyy HH:mm:ss zzz";
    private static final Logger LOGGER = Logger.getLogger(WadlResource.class.getName());

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

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

    @Produces({"application/vnd.sun.wadl+xml", "application/xml"})
    @GET
    public synchronized Response getWadl(@Context UriInfo uriInfo) {
        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) {
                LOGGER.log(Level.WARNING, "Could not marshal wadl Application.", e);
                return Response.ok(applicationDescription).build();
            }
        }

        return Response.ok(new ByteArrayInputStream(wadlXmlRepresentation)).header("Last-modified", lastModified).build();
    }

    @Produces({"application/xml"})
    @GET
    @Path("{path}")
    public synchronized Response geExternalGramar(
        @Context UriInfo uriInfo,
        @PathParam("path") String path) {

        // 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();
    }
}