/*
 * Copyright 2011-2023 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
 *
 *      https://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.data.geo;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;

/**
 * Custom {@link Page} to carry the average distance retrieved from the {@link GeoResults} the {@link GeoPage} is set up
 * from.
 *
 * @author Oliver Gierke
 * @author Thomas Darimont
 * @since 1.8
 */
public class GeoPage<T> extends PageImpl<GeoResult<T>> {

	private static final long serialVersionUID = -5655267379242128600L;

	/**
	 * The average distance of the underlying results.
	 */
	private final Distance averageDistance;

	/**
	 * Creates a new {@link GeoPage} from the given {@link GeoResults}.
	 *
	 * @param results must not be {@literal null}.
	 */
	public GeoPage(GeoResults<T> results) {

		super(results.getContent());

		this.averageDistance = results.getAverageDistance();
	}

	/**
	 * Creates a new {@link GeoPage} from the given {@link GeoResults}, {@link Pageable} and total.
	 *
	 * @param results must not be {@literal null}.
	 * @param pageable must not be {@literal null}.
	 * @param total
	 */
	public GeoPage(GeoResults<T> results, Pageable pageable, long total) {

		super(results.getContent(), pageable, total);

		this.averageDistance = results.getAverageDistance();
	}

	@Override
	public boolean equals(@Nullable Object obj) {

		if (this == obj) {
			return true;
		}

		if (!(obj instanceof GeoPage<?> that)) {
			return false;
		}

		return super.equals(obj) && ObjectUtils.nullSafeEquals(this.averageDistance, that.averageDistance);
	}

	@Override
	public int hashCode() {
		return super.hashCode() + ObjectUtils.nullSafeHashCode(this.averageDistance);
	}

	public Distance getAverageDistance() {
		return this.averageDistance;
	}
}
