package org.lucares.pdbui;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.lucares.collections.LongList;

final class LongPair implements Comparable<LongPair> {
	private final long a, b;

	public LongPair(final long a, final long b) {
		super();
		this.a = a;
		this.b = b;
	}

	public static List<LongPair> fromLongList(final LongList longList) {
		final List<LongPair> result = new ArrayList<>();
		for (int i = 0; i < longList.size(); i += 2) {

			result.add(new LongPair(longList.get(i), longList.get(i + 1)));

		}
		Collections.sort(result);
		return result;
	}

	public long getA() {
		return a;
	}

	public long getB() {
		return b;
	}

	@Override
	public String toString() {
		return a + "," + b;
	}

	@Override
	public int compareTo(final LongPair o) {
		return Comparator.comparing(LongPair::getA).thenComparing(LongPair::getB).compare(this, o);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (int) (a ^ (a >>> 32));
		result = prime * result + (int) (b ^ (b >>> 32));
		return result;
	}

	@Override
	public boolean equals(final Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		final LongPair other = (LongPair) obj;
		if (a != other.a)
			return false;
		if (b != other.b)
			return false;
		return true;
	}
}