import { createContext, useContext } from "react";
import type { PatientReferral } from "../../../utils/patientReferrals.ts";

export type PatientHomeReferrals = {
  /** The patient's referrals once read; `undefined` while loading or after the read failed. */
  referrals: PatientReferral[] | undefined;
  failed: boolean;
  markBooked: (referralId: string) => Promise<void>;
  declineInvite: (referralId: string) => Promise<void>;
};

// Unprovided means no referral read on this surface, so it adds nothing rather than withholding counts.
const NONE: PatientHomeReferrals = { referrals: [], failed: false, markBooked: async () => {}, declineInvite: async () => {} };

export const PatientHomeReferralsContext = createContext<PatientHomeReferrals>(NONE);

export const usePatientHomeReferrals = (): PatientHomeReferrals => useContext(PatientHomeReferralsContext);

/** A referral still waits on the patient until it is booked. */
export const openReferrals = (referrals: PatientReferral[]): PatientReferral[] =>
  referrals.filter((referral) => referral.stage !== "booked");