/*
 * Copyright 2016 KairosDB 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.kairosdb.core.groupby;

import org.json.JSONException;
import org.json.JSONWriter;
import org.kairosdb.core.formatter.FormatterException;

import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

import static java.util.Objects.requireNonNull;

public class TagGroupByResult implements GroupByResult
{
	private Map<String, String> tagResults = new HashMap<String, String>();
	private TagGroupBy groupBy;

	public TagGroupByResult(TagGroupBy groupBy, Map<String, String> tagResults)
	{
		this.groupBy = requireNonNull(groupBy);
		this.tagResults = requireNonNull(tagResults);
	}

	public Map<String, String> getTagResults()
	{
		return tagResults;
	}

	@Override
	public String toJson() throws FormatterException
	{
		StringWriter stringWriter = new StringWriter();
		JSONWriter writer = new JSONWriter(stringWriter);

		try
		{
			writer.object();
			writer.key("name").value("tag");
			writer.key("tags").array();
			for (String name : groupBy.getTagNames())
			{
				writer.value(name);
			}
			writer.endArray();

			writer.key("group").object();
			for (String tagName : tagResults.keySet())
			{
				writer.key(tagName).value(tagResults.get(tagName));
			}
			writer.endObject();
			writer.endObject();
		}
		catch (JSONException e)
		{
			throw new FormatterException(e);
		}
		return stringWriter.toString();
	}
}