class BackgroundMusic {
  private static readonly SUPPORTED = ['ambient', 'epic', 'scary', 'none'];

  private constructor(private readonly _value: string) {}

  static create(value: string): BackgroundMusic {
    if (!this.SUPPORTED.includes(value.toLowerCase())) {
      throw new Error(`Music not supported: ${value}`);
    }
    return new BackgroundMusic(value.toLowerCase());
  }

  get value(): string {
    return this._value;
  }
}

class SoundEffect {
  private static readonly SUPPORTED = ['scream', 'whoosh', 'none'];

  private constructor(private readonly _value: string) {}

  static create(value: string): SoundEffect {
    if (!this.SUPPORTED.includes(value.toLowerCase())) {
      throw new Error(`Sound effect not supported: ${value}`);
    }
    return new SoundEffect(value.toLowerCase());
  }

  get value(): string {
    return this._value;
  }
}

export interface MusicConfigProps {
  backgroundMusic: string;
  soundEffect: string;
}

export class MusicConfig {
  private constructor(
    public readonly backgroundMusic: BackgroundMusic,
    public readonly soundEffect: SoundEffect
  ) {}

  static create(props: MusicConfigProps): MusicConfig {
    return new MusicConfig(
      BackgroundMusic.create(props.backgroundMusic),
      SoundEffect.create(props.soundEffect)
    );
  }

  static createDefault(): MusicConfig {
    return this.create({
      backgroundMusic: 'none',
      soundEffect: 'none'
    });
  }
}