export default class IframeReference {
  private static targetOrigin: string | null = null;
  private static iframe: HTMLIFrameElement | null = null;

  private constructor() { }

  public static setTargetOrigin(targetOrigin: string): void {
    if (this.targetOrigin) {
      console.debug("targetOrigin is already set");
      return;
    }

    try {
      new URL(targetOrigin);
      this.targetOrigin = targetOrigin;
    } catch {
      throw new Error(`Invalid targetOrigin: ${targetOrigin}`);
    }
  }

  public static getTargetOrigin(): string {
    if (!this.targetOrigin) {
      throw new Error("targetOrigin is not set");
    }
    return this.targetOrigin;
  }

  public static setIframe(iframe: HTMLIFrameElement | null): void {
    if (iframe !== null && !(iframe instanceof HTMLIFrameElement)) {
      throw new Error("setIframe expects an HTMLIFrameElement or null");
    }
    this.iframe = iframe;
  }

  public static getIframe(): HTMLIFrameElement {
    if (!this.iframe) {
      throw new Error("iframe is not set");
    }
    return this.iframe;
  }
}