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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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 org.elasticsearch.test.rest.json;

import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.json.JsonXContent;
import org.elasticsearch.test.rest.Stash;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Holds a json object and allows to extract specific values from it
 */
public class JsonPath {

    final String json;
    final Map jsonMap;

    public JsonPath(String json) throws IOException {
        this.json = json;
        this.jsonMap = convertToMap(json);
    }

    private static Map convertToMap(String json) throws IOException {
        try (XContentParser parser = JsonXContent.jsonXContent.createParser(json)) {
            return parser.mapOrdered();
        }
    }

    /**
     * Returns the object corresponding to the provided path if present, null otherwise
     */
    public Object evaluate(String path) {
        return evaluate(path, Stash.EMPTY);
    }

    /**
     * Returns the object corresponding to the provided path if present, null otherwise
     */
    public Object evaluate(String path, Stash stash) {
        String[] parts = parsePath(path);
        Object object = jsonMap;
        for (String part : parts) {
            object = evaluate(part, object, stash);
            if (object == null) {
                return null;
            }
        }
        return object;
    }

    @SuppressWarnings("unchecked")
    private Object evaluate(String key, Object object, Stash stash) {
        if (stash.isStashedValue(key)) {
            key = stash.unstashValue(key).toString();
        }

        if (object instanceof Map) {
            return ((Map) object).get(key);
        }
        if (object instanceof List) {
            List