export class LeadStage {

  private static readonly _new: string = 'new';
  private static readonly _decision: string = 'decision';
  private static readonly _payment: string = 'payment';
  private static readonly _rejected: string = 'rejected';
  private static readonly _checkup: string = 'checkup';
  private static readonly _won: string = 'won';

  private static readonly _stages: string[] = [
    LeadStage._new,
    LeadStage._decision,
    LeadStage._payment,
    LeadStage._rejected,
    LeadStage._checkup,
    LeadStage._won,
  ];

  public get new(): string {
      return LeadStage._new;
  }

  public get decision(): string {
      return LeadStage._decision;
  }

  public get payment(): string {
      return LeadStage._payment;
  }

  public get rejected(): string {
      return LeadStage._rejected;
  }

  public get checkup(): string {
      return LeadStage._checkup;
  }

  public get won(): string {
      return LeadStage._won;
  }

  public get all(): string[] {
      return LeadStage._stages;
  }
}