/*
 * JsonUtilities.java
 *
 *   PSPDFKit
 *
 *   Copyright © 2021-2022 PSPDFKit GmbH. All rights reserved.
 *
 *   THIS SOURCE CODE AND ANY ACCOMPANYING DOCUMENTATION ARE PROTECTED BY INTERNATIONAL COPYRIGHT LAW
 *   AND MAY NOT BE RESOLD OR REDISTRIBUTED. USAGE IS BOUND TO THE PSPDFKIT LICENSE AGREEMENT.
 *   UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS SUBJECT TO CIVIL AND CRIMINAL PENALTIES.
 *   This notice may not be removed from this file.
 */

package com.pspdfkit.react.helper;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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

public class JsonUtilities {

    /**
     * Converts the given {@link JSONObject} to a {@link Map}.
     */
    public static Map<String, Object> jsonObjectToMap(JSONObject object) throws JSONException {
        Map<String, Object> map = new HashMap<>(object.length());

        Iterator<String> keysItr = object.keys();
        while (keysItr.hasNext()) {
            String key = keysItr.next();
            Object value = object.get(key);

            if (value instanceof JSONArray) {
                value = toList((JSONArray) value);
            } else if (value instanceof JSONObject) {
                value = jsonObjectToMap((JSONObject) value);
            } else if ( value == JSONObject.NULL) {
                value = null;
            }
            map.put(key, value);
        }
        return map;
    }

    private static List<Object> toList(JSONArray array) throws JSONException {
        List<Object> list = new ArrayList<>(array.length());
        for (int i = 0; i < array.length(); i++) {
            Object value = array.get(i);
            if (value instanceof JSONArray) {
                value = toList((JSONArray) value);
            } else if (value instanceof JSONObject) {
                value = jsonObjectToMap((JSONObject) value);
            } else if ( value == JSONObject.NULL) {
                value = null;
            }
            list.add(value);
        }
        return list;
    }
}