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/*
 * Licensed to the Indoqa Software Design und Beratung GmbH (Indoqa) under
 * one or more contributor license agreements. See the NOTICE file distributed
 * with this work for additional information regarding copyright ownership.
 * Indoqa licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.indoqa.nexus.downloader.client.json;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

import org.json.JSONObject;

public final class JsonHelper {

    private JsonHelper() {
        //hide utility class constructor
    }

    public static Optional getJsonObject(JSONObject jsonObject, String key) {
        if (!jsonObject.has(key) || jsonObject.isNull(key)) {
            return Optional.empty();
        }
        return Optional.of(jsonObject.getJSONObject(key));
    }

    public static String getString(JSONObject jsonObject, String key, String defaultValue) {
        if (!jsonObject.has(key) || jsonObject.isNull(key)) {
            return defaultValue;
        }
        return jsonObject.getString(key);
    }

    public static Optional getOptionalString(JSONObject jsonObject, String key) {
        if (!jsonObject.has(key) || jsonObject.isNull(key)) {
            return Optional.empty();
        }

        return Optional.of(jsonObject.getString(key));
    }

    public static String getString(JSONObject jsonObject, String key) {
        return getString(jsonObject, key, "");
    }

    public static List getJsonArrayAsList(JSONObject jsonObject, String key) {
        if (!jsonObject.has(key)) {
            return Collections.emptyList();
        }
        return jsonObject
            .getJSONArray(key)
            .toList()
            .stream()
            .filter(e -> e instanceof Map)
            .map(e -> new JSONObject((Map) e))
            .collect(Collectors.toList());
    }
}