package cs3500.connectn.model;

import java.util.Comparator;
import java.util.Objects;

/**
 * A 2-D integer grid position.
 */
public final class Position implements Comparable<Position> {
  /**
   * Constructs a new {@code Position} with the given column and row.
   *
   * @param x the column
   * @param y the row
   * @return the new {@code Position}
   */
  public static Position posn(int x, int y) {
    return new Position(x, y);
  }

  private Position(int x, int y) {
    this.x = x;
    this.y = y;
  }

  public int x() { return x; }
  private final int x;

  public int y() { return y; }
  private final int y;

  @Override
  public String toString() {
    return String.format("(%d, %d)", x, y);
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof Position)) return false;
    Position other = (Position) o;
    return this.x == other.x && this.y == other.y;
  }

  @Override
  public int hashCode() {
    return Objects.hash(x, y);
  }

  /**
   * Compares to another {@code Position} using lexicographic order.
   *
   * <p>
   * {@inheritDoc}
   */
  @Override
  public int compareTo(Position other) {
    return COMPARATOR.compare(this, other);
  }
  private static final Comparator<Position> COMPARATOR =
    Comparator
      .comparingInt(Position::y)
      .thenComparingInt(Position::x);
}