export class TestDataVersion {
  private versions: Map<string, string> = new Map();
  private currentVersion: string = '1.0.0';

  setCurrentVersion(version: string): void {
    this.currentVersion = version;
  }

  getCurrentVersion(): string {
    return this.currentVersion;
  }

  saveVersion(key: string, data: string): void {
    this.versions.set(`${this.currentVersion}-${key}`, data);
  }

  getVersion(key: string): string | undefined {
    return this.versions.get(`${this.currentVersion}-${key}`);
  }

  listVersions(): string[] {
    return Array.from(new Set(Array.from(this.versions.keys()).map(k => k.split('-')[0])));
  }

  export(): string {
    return JSON.stringify({
      currentVersion: this.currentVersion,
      versions: Object.fromEntries(this.versions)
    }, null, 2);
  }

  import(json: string): void {
    const imported = JSON.parse(json);
    this.currentVersion = imported.currentVersion;
    this.versions = new Map(Object.entries(imported.versions));
  }
}