/**
 * Both `start` and `end` are in seconds.
 */
export class TimeFragment {
  start: number | null;
  end: number | null;

  constructor(start: number, end: number) {
    this.start = start;
    this.end = end;
  }

  public static parse(fragment: string): TimeFragment {
    if (!fragment.startsWith("t=")) {
      return undefined;
    }
    const data = fragment.substring("t=".length);
    try {
      const [start, end] = data.split(",").map((str) => parseFloat(str));
      return new TimeFragment(start || null, end || null);
    } catch {
      return undefined;
    }
  }

  public toString(): string {
    return `t=${this.start || ""},${this.end || ""}`;
  }
}