export type ChartLibraryView =
  | { readonly kind: "list" }
  | { readonly kind: "self" }
  | { readonly kind: "other"; readonly id: string }
  | { readonly kind: "add" };

export const CHART_LIBRARY_LIST_VIEW: ChartLibraryView = { kind: "list" };

export function synastryHistoryForPartner<T extends {
  readonly partnerName: string;
  readonly partnerChartId?: string;
}>(history: readonly T[], partner: { readonly id: string; readonly name: string }) {
  return history.filter((item) => (
    item.partnerChartId
      ? item.partnerChartId === partner.id
      : item.partnerName === partner.name
  ));
}