/**
 * Asking the overview to open one visit's workspace from somewhere else - the chart's View encounter on
 * a past visit (deck practitioner#s-encounter board 11, "After the visit has ended"). Carried in router
 * state, so a reload does not reopen it.
 */
export interface OpenVisitRequest {
  encounterId: string;
  patientId: string;
}

interface OpenVisitState {
  openVisit?: Partial<OpenVisitRequest>;
}

export const openVisitState = (encounterId: string, patientId: string): OpenVisitState => ({
  openVisit: { encounterId, patientId },
});

export const readOpenVisit = (state: unknown): OpenVisitRequest | undefined => {
  const asked = (state as OpenVisitState | null | undefined)?.openVisit;
  return asked?.encounterId && asked.patientId
    ? { encounterId: asked.encounterId, patientId: asked.patientId }
    : undefined;
};

/** The encounter a record row is the visit of - a row id is `<resourceType>/<id>`. */
export const visitEncounterId = (event: { id: string; kind: string }): string | undefined => {
  if (event.kind !== 'visit' || !event.id.startsWith('Encounter/')) return undefined;
  return event.id.slice('Encounter/'.length) || undefined;
};