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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 

 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 

 * 3. Neither the name of Liferay, Inc. nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.wedeploy.api.query;

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

/**
 * Aggregation builder.
 */
public class Aggregation implements Embodied {

	public static Aggregation avg(String name, String field) {
		return of(name, field, "avg");
	}

	public static Aggregation count(String name, String field) {
		return of(name, field, "count");
	}

	public static DistanceAggregation distance(
		String name, String field, Object location, Range... ranges) {

		return new DistanceAggregation(name, field, location, ranges);
	}

	public static Aggregation extendedStats(String name, String field) {
		return of(name, field, "extendedStats");
	}

	public static Aggregation histogram(
		String name, String field, int interval) {

		return new Aggregation(name, field, "histogram", interval);
	}

	public static Aggregation max(String name, String field) {
		return of(name, field, "max");
	}

	public static Aggregation min(String name, String field) {
		return of(name, field, "min");
	}

	public static Aggregation missing(String name, String field) {
		return of(name, field, "missing");
	}

	public static Aggregation of(String name, String field, String operator) {
		return new Aggregation(name, field, operator);
	}

	public static RangeAggregation range(
		String name, String field, Range... ranges) {

		return new RangeAggregation(name, field, ranges);
	}

	public static Aggregation stats(String name, String field) {
		return of(name, field, "stats");
	}

	public static Aggregation sum(String name, String field) {
		return of(name, field, "sum");
	}

	public static Aggregation terms(String name, String field) {
		return of(name, field, "terms");
	}

	@Override
	public Object body() {
		Map map = new HashMap();

		map.put("name", name);
		map.put("operator", operator);

		if (value != null) {
			map.put("value", value);
		}

		return Util.wrap(field, map);
	}

	@Override
	public String toString() {
		return Util.toString(Query.aggregate(this));
	}

	public static final class DistanceAggregation extends Aggregation {

		public DistanceAggregation range(Object from, Object to) {
			return range(Range.range(from, to));
		}

		public DistanceAggregation range(Range range) {
			this.ranges.add(range);
			return this;
		}

		public DistanceAggregation unit(String unit) {
			((Map) value).put("unit", unit);
			return this;
		}

		private DistanceAggregation(
			String name, String field, Object location, Range... ranges) {

			super(name, field, "geoDistance", new HashMap());

			Map map = (Map) value;
			this.ranges = new ArrayList();
			this.ranges.addAll(Arrays.asList(ranges));

			map.put("location", location);
			map.put("ranges", this.ranges);
		}

		private final List