import type { Appointment } from "fhir/r4";
import type { PatientReadinessSummary } from "../services/PatientReadinessService.tsx";

// The server's label and statuses for the "first appointment" area (patientReadiness.ts).
export const FIRST_APPOINTMENT_LABEL = "First appointment";
const SCHEDULED_STATUSES = new Set<string>(["booked", "arrived", "checked-in", "fulfilled"]);

/**
 * The server reads appointments through HealthLake search, which lags a write by seconds, so a
 * readiness read just after the desk books can miss the visit the desk is looking at. A scheduled
 * visit already on screen settles that one area; nothing here ever marks an area incomplete.
 */
export const readinessCountsTheVisitOnScreen = (
  summary: PatientReadinessSummary,
  appointments: Appointment[],
): PatientReadinessSummary => {
  if (!summary.incompleteLabels.includes(FIRST_APPOINTMENT_LABEL)) return summary;
  if (!appointments.some((appointment) => SCHEDULED_STATUSES.has(appointment.status))) return summary;
  const incompleteLabels = summary.incompleteLabels.filter((label) => label !== FIRST_APPOINTMENT_LABEL);
  return {
    ...summary,
    incompleteLabels,
    completedCount: Math.min(summary.totalCount, summary.completedCount + 1),
    completed: incompleteLabels.length === 0,
  };
};