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package org.opentripplanner.routing.util;

public record DiffEntry(T left, T right) {
  /**
   * Return the left instance if it exist, if not return the right instance. If both exist(left
   * equals right) then left is returned.
   */
  public T element() {
    return rightOnly() ? right : left;
  }

  /* The element exist in the left collection, not in the right. */
  public boolean leftOnly() {
    return right == null;
  }

  /* The element exist in the right collection, not in the left. */
  public boolean rightOnly() {
    return left == null;
  }

  /* The element exist in both collections. Element left equals the right instance. */
  public boolean isEqual() {
    return left != null && right != null;
  }

  /**
   * Return a status message based on the element existence: - exist in left and right collection -
   * exist left only - or, exist right only
   */
  public String status(String equal, String left, String right) {
    return leftOnly() ? left : (rightOnly() ? right : equal);
  }

  @Override
  public String toString() {
    if (isEqual()) return "(eq: " + element() + ")";
    if (leftOnly()) return "(left: " + left + ")";
    return "(right: " + right + ")";
  }

  static  DiffEntry ofLeft(T left) {
    return new DiffEntry(left, null);
  }

  static  DiffEntry ofRight(T right) {
    return new DiffEntry(null, right);
  }

  static  DiffEntry ofEqual(T left, T right) {
    return new DiffEntry(left, right);
  }
}