/*
 * Copyright ©2019 Hal Perkins.  All rights reserved.  Permission is
 * hereby granted to students registered for University of Washington
 * CSE 331 for use solely during Spring Quarter 2019 for purposes of
 * the course.  No other use, copying, distribution, or modification
 * is permitted without prior written consent. Copyrights for
 * third-party components of this work must be honored.  Instructors
 * interested in reusing these course materials should contact the
 * author.
 */

package pathfinder.parser;

/**
 * This represents one immutable entry of the data in campus_paths.tsv,
 */
public class CampusPath {

  /**
   * The pixel-x coordinate of the first point in this path segment.
   */
  private final double x1;

  /**
   * The pixel-y coordinate of the first point in this path segment.
   */
  private final double y1;

  /**
   * The pixel-x coordinate of the second point in this path segment.
   */
  private final double x2;

  /**
   * The pixel-y coordinate of the second point in this path segment.
   */
  private final double y2;

  /**
   * The distance between the points as described in the dataset.
   */
  private final double distance;

  /**
   * Creates a new immutable CampusPath entry containing the provided data.
   *
   * @param x1       The pixel-x coordinate of the first point
   * @param y1       The pixel-y coordinate of the first point
   * @param x2       The pixel-x coordinate of the second point
   * @param y2       The pixel-y coordinate of the second point
   * @param distance The distance between the points as described in the dataset
   */
  public CampusPath(double x1, double y1, double x2, double y2, double distance) {
    this.x1 = x1;
    this.y1 = y1;
    this.x2 = x2;
    this.y2 = y2;
    this.distance = distance;
  }

  /**
   * @return The pixel-x coordinate of the first point in this path segment.
   */
  public double getX1() {
    return x1;
  }

  /**
   * @return The pixel-y coordinate of the first point in this path segment.
   */
  public double getY1() {
    return y1;
  }

  /**
   * @return The pixel-x coordinate of the second point in this path segment.
   */
  public double getX2() {
    return x2;
  }

  /**
   * @return The pixel-y coordinate of the second point in this path segment.
   */
  public double getY2() {
    return y2;
  }

  /**
   * @return The distance between the points as described in the dataset.
   */
  public double getDistance() {
    return distance;
  }

  @Override
  public String toString() {
    return String.format("[Path (%.3f, %.3f) -> (%.3f, %.3f); Distance: %.3f]",
                         x1, y1, x2, y2, distance);
  }

  @Override
  public boolean equals(Object other) {
    if(this == other) {
      return true;
    }
    if(!(other instanceof CampusPath)) {
      return false;
    }
    if(this.hashCode() != other.hashCode()) {
      // Equal objects must have equal hashCodes, according
      // to the hashCode spec, so if their hashCodes aren't equal,
      // the object's can't be equal.
      return false;
    }
    CampusPath that = (CampusPath) other;
    return (Double.compare(this.x1, that.x1) == 0)
           && (Double.compare(this.y1, that.y1) == 0)
           && (Double.compare(this.x2, that.x2) == 0)
           && (Double.compare(this.y2, that.y2) == 0)
           && (Double.compare(this.distance, that.distance) == 0);
  }

  @Override
  public int hashCode() {
    int result = Double.hashCode(this.distance);
    result = (31 * result) + Double.hashCode(this.x1);
    result = (31 * result) + Double.hashCode(this.y1);
    result = (31 * result) + Double.hashCode(this.x2);
    result = (31 * result) + Double.hashCode(this.y2);
    return result;
  }
}