class Deprecated {
  constructor (public deprecated: string,
    public use: string,
    public updateBy: string,
    public deprecatedValue: string) {}
}

export class Deprecator {
  private _deprecated: Deprecated[] = [];

  constructor (public parentClass: any,
    public globalMessage?: string) {}

  public deprecate (deprecatedMember: string, 
    use: string, updateBy: string, deprecatedValue?: string): void {
    const dep = new Deprecated(
      deprecatedMember,
      use,
      updateBy,
      deprecatedValue
    );

    this._deprecated.push(dep);
  }

  public render (parent: any): void {
    if (this._deprecated.length > 0) {
      console.warn(this._createWarningMessage());
      if (this.globalMessage) {
        console.warn(this.globalMessage);
      }
      console.table(this._createTableRows(parent))
    }
  }

  private _createTableRows (parent) {
    return this._deprecated.filter(
      prop => parent[prop.deprecated]
    )
    .map(
      dep => {
        return {
          deprecated: dep.deprecated,
          deprecatedValue: dep.deprecatedValue || 'n/a',
          use: dep.use,
          updateBy: dep.updateBy
        }
      }
    );
  }

  private _createWarningMessage (): string {
    return `${this.parentClass.constructor.name} is using deprecated members. Please update the following`;
  }
}