/**
 * ReST API for accessing groups in the Annotation store.
 */
package de.mpiwg.itgroup.annotations.restlet;

/*
 * #%L
 * AnnotationManager
 * %%
 * Copyright (C) 2012 - 2014 MPIWG Berlin
 * %%
 * This program 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.
 * 
 * This program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.neo4j.graphdb.Node;
import org.restlet.data.Status;
import org.restlet.ext.json.JsonRepresentation;
import org.restlet.representation.Representation;
import org.restlet.resource.Get;

import de.mpiwg.itgroup.annotations.Resource;
import de.mpiwg.itgroup.annotations.neo4j.AnnotationStore;

/**
 * API for accessing resource objects in the Annotation store.
 * 
 * @author dwinter
 * 
 */
public class AnnotatorResources extends AnnotatorResourceImpl {

    /**
     * GET with JSON content-type. 
     * Parameters: user: short user name uri: user uri
     * 
     * @param entity
     * @return
     */
    @Get("json")
    public Representation doGetJSON(Representation entity) {
        logger.fine("AnnotatorResources doGetJSON!");

        String jsonId = (String) getRequest().getAttributes().get("id");
        if (jsonId != null) {
            // URL decode
            try {
                jsonId = URLDecoder.decode(jsonId, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                // this shouldn't happen
            }
        }
        String uri = decodeJsonId(jsonId);

        logger.fine("resources-id=" + uri);

        if (uri == null) {
            return getAllResources();
        } else {
            return getResource(uri);
        }
    }

    protected Representation getResource(String uri) {
        AnnotationStore store = getAnnotationStore();
        Node resNode = store.getResourceNodeByUri(uri);
        Resource resource = store.createResourceFromNode(resNode);
        JSONObject jo = new JSONObject();
        try {
            jo.put("id", encodeJsonId(resource.getUri()));
            jo.put("uri", resource.getUri());
        } catch (JSONException e) {
        }

        return new JsonRepresentation(jo);
    }

    protected Representation getAllResources() {
        JSONArray results = new JSONArray();
        AnnotationStore store = getAnnotationStore();

        List<Resource> resources = store.getResources(null, null);
        for (Resource resource : resources) {
            JSONObject jo = new JSONObject();
            try {
                jo.put("id", encodeJsonId(resource.getUri()));
                jo.put("uri", resource.getUri());
            } catch (JSONException e) {
            }
            results.put(jo);
        }

        // assemble result object
        JSONObject result = new JSONObject();
        try {
            result.put("rows", results);
            result.put("total", results.length());
        } catch (JSONException e) {
            setStatus(Status.SERVER_ERROR_INTERNAL, "JSON Error");
            return null;
        }
        logger.fine("sending:");
        logger.fine(result.toString());
        return new JsonRepresentation(result);
    }

}