package de.mpiwg.itgroup.annotations.restlet;

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

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.restlet.data.Form;
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.Annotation;
import de.mpiwg.itgroup.annotations.Person;
import de.mpiwg.itgroup.annotations.neo4j.AnnotationStore;
import de.mpiwg.itgroup.annotations.restlet.utils.JSONObjectComparator;

/**
 * API for accessing tags in the Annotation store.
 * 
 * @author dwinter
 * 
 */
public class AnnotatorAnnotationsByTags extends AnnotatorResourceImpl {
    protected String getAllowedMethodsForHeader() {
        return "OPTIONS,GET";
    }

    @Get("json")
    public Representation doGetJSON(Representation entity) {
        logger.debug("AnnotatorAnnotatonsBytag doGetJSON!");
        setCorsHeaders();

        // do authentication
        Person authUser = Person.createPersonWithId(this.checkAuthToken(entity));
        logger.debug("request authenticated=" + authUser);

        String id = (String) getRequest().getAttributes().get("id");
        // URL decode
        try {
            id = URLDecoder.decode(id, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // this shouldn't happen
        }
        logger.debug("annotation-id=" + id);

        Form form = getRequest().getResourceRef().getQueryAsForm();
        String sortBy = form.getFirstValue("sortBy");

        AnnotationStore store = getAnnotationStore();
        String tagUri = BaseRestlet.TAGS_URI_PREFIX + id;
        List<Annotation> annotations = store.getAnnotationsByTag(tagUri);

        // JSONArray results = new JSONArray();
        ArrayList<JSONObject> results = new ArrayList<JSONObject>();

        for (Annotation annot : annotations) {
            // check permission
            if (!annot.isActionAllowed("read", authUser, store))
                continue;

            JSONObject jo = createAnnotatorJson(annot, false);
            results.add(jo);
        }

        if (sortBy != null) {
            JSONObjectComparator.sortAnnotations(results, sortBy);
        }

        JSONArray resultsJa = new JSONArray();
        for (JSONObject result : results) {
            resultsJa.put(result);
        }

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

}