import dayjs from "dayjs";
import useSWR from "swr";
import { openmrsFetch } from "@openmrs/esm-framework";
import {
  type AppointmentPayload,
  type AppointmentService,
  type AppointmentsFetchResponse,
  type RecurringAppointmentsPayload,
} from "../types";
import isToday from "dayjs/plugin/isToday";
dayjs.extend(isToday);

const appointmentsSearchUrl = `/ws/rest/v1/appointments/search`;

export function useAppointments(
  patientUuid: string,
  startDate: string,
  abortController: AbortController,
) {
  /*
    SWR isn't meant to make POST requests for data fetching. This is a consequence of the API only exposing this resource via POST.
    This works but likely isn't recommended.
  */
  const fetcher = () =>
    openmrsFetch(appointmentsSearchUrl, {
      method: "POST",
      signal: abortController.signal,
      headers: {
        "Content-Type": "application/json",
      },
      body: {
        patientUuid: patientUuid,
        startDate: startDate,
      },
    });

  const { data, error, isLoading, isValidating, mutate } = useSWR<
    AppointmentsFetchResponse,
    Error
  >(appointmentsSearchUrl, fetcher);

  const appointments = data?.data?.length ? data.data : null;

  const pastAppointments = appointments
    ?.sort((a, b) => (b.startDateTime > a.startDateTime ? 1 : -1))
    ?.filter(({ status }) => status !== "Cancelled")
    ?.filter(({ startDateTime }) =>
      dayjs(new Date(startDateTime).toISOString()).isBefore(
        new Date().setHours(0, 0, 0, 0),
      ),
    );

  const upcomingAppointments = appointments
    ?.sort((a, b) => (a.startDateTime > b.startDateTime ? 1 : -1))
    ?.filter(({ status }) => status !== "Cancelled")
    ?.filter(({ startDateTime }) =>
      dayjs(new Date(startDateTime).toISOString()).isAfter(new Date()),
    );

  const todaysAppointments = appointments
    ?.sort((a, b) => (a.startDateTime > b.startDateTime ? 1 : -1))
    ?.filter(({ status }) => status !== "Cancelled")
    ?.filter(({ startDateTime }) =>
      dayjs(new Date(startDateTime).toISOString()).isToday(),
    );

  return {
    data: data
      ? { pastAppointments, upcomingAppointments, todaysAppointments }
      : null,
    isError: error,
    isLoading,
    isValidating,
    mutate,
  };
}

export function useAppointmentService() {
  const { data, error, isLoading } = useSWR<
    { data: Array<AppointmentService> },
    Error
  >(`/ws/rest/v1/appointmentService/all/full`, openmrsFetch);

  return {
    data: data ? data.data : null,
    isError: error,
    isLoading,
  };
}

export function saveAppointment(
  appointment: AppointmentPayload,
  abortController: AbortController,
) {
  return openmrsFetch(`/ws/rest/v1/appointment`, {
    method: "POST",
    signal: abortController.signal,
    headers: {
      "Content-Type": "application/json",
    },
    body: appointment,
  });
}

export function saveRecurringAppointments(
  recurringAppointments: RecurringAppointmentsPayload,
  abortController: AbortController,
) {
  return openmrsFetch(`/ws/rest/v1/recurring-appointments`, {
    method: "POST",
    signal: abortController.signal,
    headers: {
      "Content-Type": "application/json",
    },
    body: recurringAppointments,
  });
}

export function getAppointmentsByUuid(
  appointmentUuid: string,
  abortController: AbortController,
) {
  return openmrsFetch(`/ws/rest/v1/appointments/${appointmentUuid}`, {
    signal: abortController.signal,
  });
}

export function getAppointmentService(abortController: AbortController, uuid) {
  return openmrsFetch(`/ws/rest/v1/appointmentService?uuid=` + uuid, {
    signal: abortController.signal,
  });
}

export const cancelAppointment = async (
  toStatus: string,
  appointmentUuid: string,
  ac: AbortController,
) => {
  const omrsDateFormat = "YYYY-MM-DDTHH:mm:ss.SSSZZ";
  const timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
  const statusChangeTime = dayjs(new Date()).format(omrsDateFormat);
  const url = `/ws/rest/v1/appointments/${appointmentUuid}/status-change`;
  return await openmrsFetch(url, {
    body: { toStatus, onDate: statusChangeTime, timeZone: timeZone },
    method: "POST",
    headers: { "Content-Type": "application/json" },
  });
};