/*******************************************************************************
 * Copyright (c) 2012-2016 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.everrest.services;

import org.everrest.core.ObjectFactory;
import org.everrest.core.ResourceBinder;
import org.everrest.core.resource.ResourceDescriptor;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

@Path("/")
public class RestServicesList {

    //
    public static class RootResource {
        private String fqn;

        private String path;

        private String regex;

        public RootResource(String fqn, String path, String regex) {
            this.fqn = fqn;
            this.path = path;
            this.regex = regex;
        }

        public String getFqn() {
            return fqn;
        }

        public String getPath() {
            return path;
        }

        public String getRegex() {
            return regex;
        }
    }

    //

    public static class RootResourcesList {
        private List<RootResource> rootResources;

        public RootResourcesList(List<RootResource> rootResources) {
            this.rootResources = rootResources;
        }

        public List<RootResource> getRootResources() {
            return rootResources;
        }
    }

    //

    private final ResourceBinder binder;

    public RestServicesList(ResourceBinder resources) {
        this.binder = resources;
    }

    @GET
    @Produces({MediaType.TEXT_HTML})
    public byte[] listHTML() {
        XMLOutputFactory factory = XMLOutputFactory.newInstance();
        factory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, Boolean.TRUE);
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        try {
            XMLStreamWriter xsw = factory.createXMLStreamWriter(output, "UTF-8");
            xsw.writeStartDocument("UTF-8", "1.0");
            xsw.writeDTD("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" "
                         + "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">");
            xsw.writeCharacters("\n");
            xsw.writeStartElement("html");
            xsw.writeDefaultNamespace("http://www.w3.org/1999/xhtml");
            xsw.writeStartElement("head");
            xsw.writeStartElement("title");
            xsw.writeCharacters("eXo JAXRS Implementation");
            xsw.writeEndElement(); // </title>
            xsw.writeEndElement(); // </head>
            xsw.writeStartElement("body");
            //
            xsw.writeStartElement("h3");
            xsw.writeAttribute("style", "text-align:center;");
            xsw.writeCharacters("Root resources");
            xsw.writeEndElement();
            // table
            xsw.writeStartElement("table");
            xsw.writeAttribute("width", "90%");
            xsw.writeAttribute("style", "table-layout:fixed;");
            // table header
            xsw.writeStartElement("tr");
            xsw.writeStartElement("th");
            xsw.writeCharacters("Path");
            xsw.writeEndElement(); // </th>
            xsw.writeStartElement("th");
            xsw.writeCharacters("Regex");
            xsw.writeEndElement(); // </th>
            xsw.writeStartElement("th");
            xsw.writeCharacters("FQN");
            xsw.writeEndElement(); // </th>
            xsw.writeEndElement(); // </tr>
            // end table header
            for (RootResource r : rootResources().getRootResources()) {
                xsw.writeStartElement("tr");
                xsw.writeStartElement("td");
                xsw.writeCharacters(r.getPath());
                xsw.writeEndElement(); // </td>
                xsw.writeStartElement("td");
                xsw.writeCharacters(r.getRegex());
                xsw.writeEndElement(); // </td>
                xsw.writeStartElement("td");
                xsw.writeCharacters(r.getFqn());
                xsw.writeEndElement(); // </td>
                xsw.writeEndElement(); // </tr>
            }
            xsw.writeEndElement(); // </table>
            xsw.writeEndElement(); // </body>
            xsw.writeEndDocument();
        } catch (XMLStreamException xmle) {
            throw new WebApplicationException(xmle, //
                                              Response.status(500) //
                                                      .entity("Unable write to output stream. " + xmle.getMessage()) //
                                                      .type(MediaType.TEXT_PLAIN) //
                                                      .build());
        }
        return output.toByteArray();
    }

    @GET
    @Produces({MediaType.APPLICATION_JSON})
    public RootResourcesList listJSON() {
        return rootResources();
    }

    protected RootResourcesList rootResources() {
        List<ObjectFactory<ResourceDescriptor>> l = binder.getResources();
        List<RootResource> resources = new ArrayList<RootResource>(l.size());
        for (ObjectFactory<ResourceDescriptor> om : l) {
            ResourceDescriptor descriptor = om.getObjectModel();
            resources.add(new RootResource(descriptor.getObjectClass().getName(), //
                                           descriptor.getPathValue().getPath(), //
                                           descriptor.getUriPattern().getRegex()));
        }
        return new RootResourcesList(resources);
    }

}