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/*
 * Copyright 2002-2015 the original author or authors.
 *
 * Licensed 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.springframework.tuple;

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

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.core.convert.converter.Converter;

/**
 * @author David Turanski
 */
public class JsonStringToTupleConverter implements Converter {

	private final ObjectMapper mapper = new ObjectMapper();

	public JsonStringToTupleConverter() {
		mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
	}

	@Override
	public Tuple convert(String source) {
		TupleBuilder builder = TupleBuilder.tuple();
		try {

			JsonNode root = mapper.readTree(source);
			for (Iterator> it = root.fields(); it.hasNext();) {
				Entry entry = it.next();
				String name = entry.getKey();
				JsonNode node = entry.getValue();
				if (node.isObject()) {
					// tuple
					builder.addEntry(name, convert(node.toString()));
				}
				else if (node.isArray()) {
					builder.addEntry(name, nodeToList(node));
				}
				else if (node.isNull()) {
					builder.addEntry(name, null);
				}
				else if (node.isBoolean()) {
					builder.addEntry(name, node.booleanValue());
				}
				else if (node.isNumber()) {
					builder.addEntry(name, node.numberValue());
				}
				else {
					builder.addEntry(name, mapper.treeToValue(node, Object.class));
				}
			}
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
		return builder.build();
	}

	private List