/**
 * IColumnDataSource - Defines the contract for providing column data
 *
 * This interface abstracts away whether columns represent dates or resources,
 * allowing the calendar to switch between date-based and resource-based views.
 */
export interface IColumnDataSource {
  /**
   * Get the list of column identifiers to render
   * @returns Array of identifiers (dates or resource IDs)
   */
  getColumns(): Date[];

  /**
   * Get the type of columns this datasource provides
   */
  getType(): 'date' | 'resource';
}