export class RaceTimeOfDay {
  readonly hour: number;
  readonly minute: number;

  constructor(hour: number, minute: number) {
    if (!Number.isInteger(hour) || hour < 0 || hour > 23) {
      throw new Error(`RaceTimeOfDay hour must be between 0 and 23, got ${hour}`);
    }
    if (!Number.isInteger(minute) || minute < 0 || minute > 59) {
      throw new Error(`RaceTimeOfDay minute must be between 0 and 59, got ${minute}`);
    }

    this.hour = hour;
    this.minute = minute;
  }

  static fromString(value: string): RaceTimeOfDay {
    const match = /^(\d{2}):(\d{2})$/.exec(value);
    if (!match) {
      throw new Error(`RaceTimeOfDay string must be in HH:MM 24h format, got "${value}"`);
    }

    const hour = Number(match[1]);
    const minute = Number(match[2]);

    return new RaceTimeOfDay(hour, minute);
  }

  toString(): string {
    const hh = this.hour.toString().padStart(2, '0');
    const mm = this.minute.toString().padStart(2, '0');
    return `${hh}:${mm}`;
  }
}