import type { Weekday } from '../types/Weekday';
import { weekdayToIndex } from '../types/Weekday';
import { RacingDomainValidationError } from '../errors/RacingDomainError';
import type { IValueObject } from '@gridpilot/shared/domain';
 
export interface WeekdaySetProps {
  days: Weekday[];
}
 
export class WeekdaySet implements IValueObject<WeekdaySetProps> {
  private readonly days: Weekday[];

  constructor(days: Weekday[]) {
    if (!Array.isArray(days) || days.length === 0) {
      throw new RacingDomainValidationError('WeekdaySet requires at least one weekday');
    }
 
    const unique = Array.from(new Set(days));
    this.days = unique.sort((a, b) => weekdayToIndex(a) - weekdayToIndex(b));
  }

  get props(): WeekdaySetProps {
    return { days: [...this.days] };
  }

  getAll(): Weekday[] {
    return [...this.days];
  }

  includes(day: Weekday): boolean {
    return this.days.includes(day);
  }

  equals(other: IValueObject<WeekdaySetProps>): boolean {
    const a = this.props.days;
    const b = other.props.days;
    if (a.length !== b.length) return false;
    return a.every((day, index) => day === b[index]);
  }
}