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/*************************************************************************
 *
 * ADOBE CONFIDENTIAL
 * __________________
 *
 *  Copyright 2015 Adobe Systems Incorporated
 *  All Rights Reserved.
 *
 * NOTICE:  All information contained herein is, and remains
 * the property of Adobe Systems Incorporated and its suppliers,
 * if any.  The intellectual and technical concepts contained
 * herein are proprietary to Adobe Systems Incorporated and its
 * suppliers and are protected by trade secret or copyright law.
 * Dissemination of this information or reproduction of this material
 * is strictly forbidden unless prior written permission is obtained
 * from Adobe Systems Incorporated.
 **************************************************************************/
package com.adobe.cq.social.ugcbase;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.sling.commons.json.JSONArray;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.commons.json.JSONObject;

/**
 * Some simple Json to java object utils.
 */
public class SocialJsonUtils {

    /**
     * Takes a json object (ie, unordered key/value data) and converts it to a java Map.
     * @param node the node to transform
     * @return the resulting Map
     * @throws org.apache.sling.commons.json.JSONException when the object can't be parsed
     */
    public static Map jsonObjectToMap(final JSONObject node) throws JSONException {
        final Map theMap = new HashMap();
        final Iterator iterator = node.keys();

        while (iterator.hasNext()) {
            final String field = iterator.next();
            final Object o = jsonDataToObject(node, field);
            if (o != null) {
                theMap.put(field, o);
            }
        }

        return theMap;
    }

    /**
     * Takes any kind of json node and converts it to a java Object.
     * @param node the node to transform
     * @param field the field in the JSONObject to convert
     * @return the resulting object
     * @throws JSONException any unexpected json exception
     */
    public static Object jsonDataToObject(final JSONObject node, final String field) throws JSONException {
        final Object o = node.get(field);
        if (o instanceof JSONArray) {
            return jsonArrayToArray((JSONArray) o);
        } else if (o instanceof JSONObject) {
            return jsonObjectToMap((JSONObject) o);
        } else if (o == JSONObject.NULL) {
            return null;
        } else {
            return o;
        }
    }

    /**
     * Takes any kind of json node and converts it to a java Object.
     * @param node the node to transform
     * @param field the field in the JSONObject to convert
     * @return the resulting object
     * @throws JSONException any unexpected json exception
     */
    public static Object jsonDataToObject(final JSONArray node, final int field) throws JSONException {
        final Object o = node.get(field);
        if (o instanceof JSONArray) {
            return jsonArrayToArray((JSONArray) o);
        } else if (o instanceof JSONObject) {
            return jsonObjectToMap((JSONObject) o);
        } else if (o == JSONObject.NULL) {
            return null;
        } else {
            return o;
        }
    }

    /**
     * Convert a json array to a java list.
     * @param node the node to transform
     * @return the resulting List of objects
     * @throws JSONException on failure
     */
    @SuppressWarnings("rawtypes")
    public static Object[] jsonArrayToArray(final JSONArray node) throws JSONException {
        final List