import EtudeError from "../error/EtudeError";

export default class Direction {
  public static size: number = 0;
  private static _values: Direction[] = [];

  public static ASCENDING = new Direction();
  public static DESCENDING = new Direction();
  public static DEFAULT = Direction.ASCENDING;

  private constructor() {
    ++Direction.size;
    Direction._values.push(this);
  }

  public static values(): Direction[] {
    return Direction._values.slice();
  }

  public ordinal(): number {
    return Direction._values.indexOf(this);
  }

  public static valueOf(directionString: string): Direction {
    const direction: Direction = Direction[directionString];
    if (direction instanceof Direction) {
      return direction;
    }
    throw EtudeError.forInvalid(Direction, directionString);
  }

  public toString(): string {
    return Object.keys(Direction).find(d => Direction[d] === this);
  }
}