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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 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
 * https://glassfish.dev.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:
 * "Portions Copyright [year] [name of copyright owner]"
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 * Contributor(s):
 * 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
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.admin.rest.readers;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Iterator;

import javax.ws.rs.Consumes;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONObject;
import org.glassfish.api.admin.ParameterMap;

/**
 * @author Ludovic Champenois
 */
@Consumes(MediaType.APPLICATION_JSON)
@Provider
public class JsonParameterMapProvider implements MessageBodyReader {

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.equals(ParameterMap.class);
    }

    @Override
    public ParameterMap readFrom(Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType, MultivaluedMap headers,
            InputStream in) throws IOException {


        JSONObject obj;
        try {
            obj = new JSONObject(inputStreamAsString(in));
            Iterator iter = obj.keys();
            ParameterMap map = new ParameterMap();

            while (iter.hasNext()) {
                String k = (String) iter.next();
                Object value = obj.get(k);
                if (value instanceof JSONArray) {
                    JSONArray array = (JSONArray) value;
                    for (int i = 0; i < array.length(); i++) {
                        map.add(k, "" + array.get(i));
                    }

                } else {
                    map.add(k, "" + value);
                }

            }
            return map;

        } catch (Exception ex) {
            ParameterMap map = new ParameterMap();
            map.add("error", "Entity Parsing Error: " + ex.getMessage());

            return map;
        }


    }

    public static String inputStreamAsString(InputStream stream) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(stream));
        StringBuilder sb = new StringBuilder();
        String line = null;

        while ((line = br.readLine()) != null) {
            sb.append(line);
        }
        br.close();
        return sb.toString();
    }
}