import React, { useEffect, useState } from "react";
import useSWRImmutable from "swr";
import { ConfigurableLink, openmrsFetch } from "@openmrs/esm-framework";
import dayjs from "dayjs";
import capitalize from "lodash/capitalize";
import { OverflowMenu } from "@carbon/react";
import {
  AddPatientToListOverflowMenuItem,
  FhirPatientResponse,
} from "@ohri/openmrs-esm-ohri-commons-lib";

export function usePatientList(
  offSet: number,
  pageSize: number,
  searchTerm?: string
) {
  const url = `/ws/fhir2/R4/Patient?_getpagesoffset=${offSet}&_count=${pageSize}${
    searchTerm ? `&name=${searchTerm}` : ""
  }&_summary=data`;
  const [paginatedPatientRows, setPaginatedPatientRows] = useState([]);
  const [totalCount, setTotalCount] = useState(0);
  const { data, error, isLoading } = useSWRImmutable<
    { data: FhirPatientResponse },
    Error
  >(url, openmrsFetch);

  useEffect(() => {
    if (data) {
      const patientRows = data.data?.entry?.map((patient) => {
        const patientName =
          patient.resource.name[0].given.join(" ") +
          " " +
          patient.resource.name[0].family;
        const getPatientLink = () => {
          return (
            <ConfigurableLink
              to={`/openmrs/spa/patient/${patient.resource.id}/chart`}
              style={{ textDecoration: "inherit" }}
            >
              {patientName}
            </ConfigurableLink>
          );
        };
        const patientActions = (
          <OverflowMenu flipped>
            <AddPatientToListOverflowMenuItem
              patientUuid={patient.resource.id}
              excludeCohorts={["Post-Test Counselling"]}
            />
          </OverflowMenu>
        );
        return {
          id: patient.resource.id,
          name: patientName,
          patientLink: getPatientLink(),
          gender: capitalize(patient.resource.gender),
          birthDate: patient.resource.birthDate,
          age:
            dayjs().diff(dayjs(patient.resource.birthDate), "year") + " years",
          actions: patientActions,
        };
      });
      setTotalCount(data?.data.total);
      setPaginatedPatientRows(patientRows);
    }
  }, [data]);

  return {
    patients: paginatedPatientRows,
    error,
    isLoading: isLoading || !data,
    total: totalCount,
  };
}