import React, { useCallback, useEffect, useMemo, useState } from 'react';

import {
  Button,
  ContentSwitcher,
  Form,
  ModalBody,
  ModalFooter,
  ModalHeader,
  Select,
  SelectItem,
  Switch,
  InlineLoading,
  TextArea,
  Layer,
  InlineNotification,
} from '@carbon/react';
import {
  navigate,
  parseDate,
  restBaseUrl,
  showNotification,
  showSnackbar,
  showToast,
  useLayoutType,
  useSession,
  useVisit,
} from '@openmrs/esm-framework';
import { useTranslation } from 'react-i18next';
import { useQueueRoomLocations } from '../hooks/useQueueRooms';
import { ArrowUp, ArrowDown } from '@carbon/react/icons';
import styles from './change-status-dialog.scss';
import { QueueStatus, extractErrorMessagesFromResponse, handleMutate } from '../utils/utils';
import {
  NewQueuePayload,
  addQueueEntry,
  getCareProvider,
  updateQueueEntry,
  updateVisit,
  useProviders,
} from './patient-queues.resource';
import { Controller, useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { CreateQueueEntryFormData, createQueueEntrySchema } from './patient-queue-validation-schema.resource';
import { PatientQueue } from '../types/patient-queues';

interface ChangeStatusDialogProps {
  queueEntry: PatientQueue;
  currentEntry: PatientQueue;
  closeModal: () => void;
}

const ChangeStatus: React.FC<ChangeStatusDialogProps> = ({ queueEntry, currentEntry, closeModal }) => {
  const { t } = useTranslation();

  const isTablet = useLayoutType() === 'tablet';

  const [contentSwitcherIndex, setContentSwitcherIndex] = useState(1);

  const [statusSwitcherIndex, setStatusSwitcherIndex] = useState(1);

  const [status, setStatus] = useState('');

  const sessionUser = useSession();

  const { queueRoomLocations, error: errorLoadingQueueRooms } = useQueueRoomLocations(
    sessionUser?.sessionLocation?.uuid,
  );
  const [selectedNextQueueLocation, setSelectedNextQueueLocation] = useState(queueRoomLocations[0]?.uuid);

  const { activeVisit } = useVisit(queueEntry.patient.uuid);

  const [isLoading, setIsLoading] = useState(true);

  const [provider, setProvider] = useState('');

  const [selectedProvider, setSelectedProvider] = useState('');

  const [priorityComment, setPriorityComment] = useState('');

  const [isSubmitting, setIsSubmitting] = useState(false);

  const [isEndingVisit, setIsEndingVisit] = useState(false);

  const { providers, error: errorLoadingProviders } = useProviders(selectedNextQueueLocation);

  // Memoize the function to fetch the provider using useCallback
  const fetchProvider = useCallback(() => {
    if (!sessionUser?.user?.uuid) return;

    setIsLoading(true);

    getCareProvider(sessionUser?.user?.uuid).then(
      (response) => {
        const uuid = response?.data?.results[0].uuid;
        setIsLoading(false);
        setProvider(uuid);
      },
      (error) => {
        const errorMessages = extractErrorMessagesFromResponse(error);
        setIsLoading(false);
        showNotification({
          title: "Couldn't get provider",
          kind: 'error',
          critical: true,
          description: errorMessages.join(','),
        });
      },
    );
  }, [sessionUser?.user?.uuid]);

  useEffect(() => fetchProvider(), [fetchProvider]);

  const priorityLabels = useMemo(() => ['Not Urgent', 'Urgent', 'Emergency'], []);

  const statusLabels = useMemo(
    () => [
      { status: 'pending', label: 'Move to Pending' },
      { status: 'completed', label: 'Move to Completed' },
    ],
    [],
  );

  const {
    handleSubmit,
    control,
    formState: { errors },
  } = useForm<CreateQueueEntryFormData>({
    mode: 'all',
    resolver: zodResolver(createQueueEntrySchema),
  });

  useEffect(() => {
    setPriorityComment(priorityLabels[contentSwitcherIndex]);
  }, [contentSwitcherIndex, priorityLabels]);

  useEffect(() => {
    setStatus(statusLabels[statusSwitcherIndex].status);
  }, [statusSwitcherIndex, statusLabels]);

  // endVisit
  const endCurrentVisit = async () => {
    setIsEndingVisit(true);
    const endVisitPayload = {
      location: activeVisit.location.uuid,
      startDatetime: parseDate(activeVisit.startDatetime),
      visitType: activeVisit.visitType.uuid,
      stopDatetime: new Date(),
    };

    const response = await updateVisit(activeVisit.uuid, endVisitPayload);

    if (response.status === 200) {
      try {
        const response = await updateQueueEntry(
          QueueStatus.Completed,
          provider,
          queueEntry?.uuid,
          contentSwitcherIndex,
          priorityComment,
          'comment',
        );

        if (response.status === 200) {
          showSnackbar({
            isLowContrast: true,
            kind: 'success',
            subtitle: t('visitEndSuccessfully', 'Visit ended successfully'),
            title: t('visitEnded', 'Visit ended'),
          });

          navigate({ to: `\${openmrsSpaBase}/home` });
          closeModal();
          setIsEndingVisit(false);
        }
      } catch (error) {
        setIsEndingVisit(false);
        showNotification({
          title: t('queueEntryUpdateFailed', 'Error ending visit'),
          kind: 'error',
          critical: true,
          description: error?.message,
        });
      }
    }
  };

  const onSubmit = useCallback(async () => {
    try {
      setIsSubmitting(true);
      if (status === QueueStatus.Pending) {
        await updateQueueEntry(status, provider, queueEntry?.uuid, 0, priorityComment, 'comment');

        showToast({
          critical: true,
          title: t('updateEntry', 'Update entry'),
          kind: 'success',
          description: t('queueEntryUpdateSuccessfully', 'Queue Entry Updated Successfully'),
        });

        closeModal();
        handleMutate(`${restBaseUrl}/patientqueue`);
        setIsSubmitting(false);
      }
      if (status === QueueStatus.Completed) {
        await updateQueueEntry(
          QueueStatus.Completed,
          provider,
          queueEntry?.uuid,
          contentSwitcherIndex,
          priorityComment,
          'comment',
        );

        // Add new queue entry
        const request: NewQueuePayload = {
          patient: queueEntry?.patient?.uuid,
          provider: selectedProvider,
          locationFrom: sessionUser?.sessionLocation?.uuid,
          locationTo: selectedNextQueueLocation,
          status: QueueStatus.Pending,
          priority: contentSwitcherIndex,
          priorityComment: priorityComment,
          comment: 'NA',
          queueRoom: selectedNextQueueLocation,
        };

        const createQueueResponse = await addQueueEntry(request);

        if (createQueueResponse.status === 201) {
          // Pick and route
          await updateQueueEntry(
            QueueStatus.Picked,
            provider,
            currentEntry?.uuid,
            contentSwitcherIndex,
            priorityComment,
            'comment',
          );

          showToast({
            critical: true,
            title: t('updateEntry', 'Move to next queue'),
            kind: 'success',
            description: t('movetonextqueue', 'Move to next queue successfully'),
          });

          // View patient summary
          navigate({ to: `\${openmrsSpaBase}/patient/${currentEntry?.patient?.uuid}/chart` });

          closeModal();
          handleMutate(`${restBaseUrl}/patientqueue`);
          setIsSubmitting(false);
        }
      }
    } catch (error: any) {
      setIsSubmitting(false);
      showNotification({
        title: t('queueEntryUpdateFailed', 'Error updating queue entry status'),
        kind: 'error',
        critical: true,
        description: error?.message,
      });
    }
  }, [
    status,

    queueEntry?.uuid,
    queueEntry?.patient?.uuid,
    priorityComment,
    t,
    closeModal,
    contentSwitcherIndex,
    selectedProvider,
    provider,
    sessionUser?.sessionLocation?.uuid,
    currentEntry?.uuid,
    currentEntry?.patient?.uuid,
    selectedNextQueueLocation,
  ]);

  if (queueEntry && Object.keys(queueEntry)?.length === 0) {
    return <ModalHeader closeModal={closeModal} title={t('patientNotInQueue', 'The patient is not in the queue')} />;
  }

  if (queueEntry && Object.keys(queueEntry)?.length > 0) {
    return (
      <>
        <div>
          {isLoading && <InlineLoading description={'Fetching Provider..'} />}
          <Form onSubmit={handleSubmit(onSubmit)}>
            <ModalHeader closeModal={closeModal} />
            <ModalBody>
              <div className={styles.modalBody}>
                <div style={{ display: 'flex', alignItems: 'center' }}>
                  <h4 className={styles.section}> Currently Picked :</h4>
                  <div style={{ margin: '10px' }}>
                    <ArrowDown size={20} />
                  </div>
                </div>
                {currentEntry?.patient?.display ? (
                  <h5 className={styles.section}>
                    {currentEntry?.patient?.display} &nbsp; · &nbsp;{currentEntry?.patient?.person?.gender} &nbsp; ·
                    &nbsp;
                    {currentEntry?.patient?.person?.age}
                    &nbsp;
                    {t('years', 'Years')}
                  </h5>
                ) : (
                  '--'
                )}

                <br></br>
                <hr />
                <br></br>
                <div style={{ display: 'flex', alignItems: 'center' }}>
                  <h4 className={styles.section}> Queue to next service area :</h4>
                  <div style={{ margin: '10px' }}>
                    <ArrowUp size={20} />
                  </div>
                </div>
                {queueEntry?.patient?.display ? (
                  <h5 className={styles.section}>
                    {queueEntry?.patient?.display} &nbsp; · &nbsp;{queueEntry?.patient?.person?.gender} &nbsp; · &nbsp;
                    {queueEntry?.patient?.person?.age}
                    &nbsp;
                    {t('years', 'Years')}
                  </h5>
                ) : (
                  '--'
                )}
              </div>
              <section className={styles.section}>
                <div className={styles.sectionTitle}>{t('priority', 'Priority')}</div>
                <Controller
                  name="priorityComment"
                  control={control}
                  render={({ field }) => (
                    <ContentSwitcher
                      {...field}
                      selectedIndex={contentSwitcherIndex}
                      className={styles.contentSwitcher}
                      onChange={({ index }) => {
                        field.onChange(index);
                        setContentSwitcherIndex(index);
                      }}
                    >
                      {priorityLabels.map((label, index) => (
                        <Switch
                          key={index}
                          name={label.toLowerCase().replace(/\s+/g, '')}
                          text={t(label.toLowerCase(), label)}
                        />
                      ))}
                    </ContentSwitcher>
                  )}
                />
              </section>

              <section className={styles.section}>
                <div className={styles.sectionTitle}>{t('status', 'Status')}</div>
                <Controller
                  name="status"
                  control={control}
                  render={({ field }) => (
                    <ContentSwitcher
                      {...field}
                      selectedIndex={statusSwitcherIndex}
                      className={styles.contentSwitcher}
                      onChange={({ index }) => {
                        field.onChange(index);
                        setStatusSwitcherIndex(index);
                      }}
                    >
                      {statusLabels.map((status, index) => (
                        <Switch
                          key={index}
                          name={status.label.toLowerCase().replace(' ', '')}
                          text={t(status.label.toLowerCase(), status.label)}
                        />
                      ))}
                    </ContentSwitcher>
                  )}
                />
              </section>

              {status === QueueStatus.Completed && (
                <>
                  <section className={styles.section}>
                    <div className={styles.sectionTitle}>{t('nextServicePoint', 'Next service point')}</div>
                    <ResponsiveWrapper isTablet={isTablet}>
                      <Controller
                        name="locationTo"
                        control={control}
                        defaultValue={queueRoomLocations[0]?.uuid || ''}
                        render={({ field }) => (
                          <Select
                            {...field}
                            id="nextQueueLocation"
                            name="nextQueueLocation"
                            labelText=""
                            disabled={errorLoadingQueueRooms}
                            invalid={!!errors.locationTo}
                            invalidText={errors.locationTo?.message}
                            value={field.value}
                            onChange={(e) => {
                              const selectedValue = e.target.value;
                              field.onChange(selectedValue);
                              setSelectedNextQueueLocation(selectedValue);
                            }}
                          >
                            {!field.value && (
                              <SelectItem value="" text={t('selectNextServicePoint', 'Choose next service point')} />
                            )}

                            {queueRoomLocations.map(({ uuid, display }) => (
                              <SelectItem key={uuid} value={uuid} text={display} />
                            ))}
                          </Select>
                        )}
                      />

                      {errorLoadingQueueRooms && (
                        <InlineNotification
                          className={styles.errorNotification}
                          kind="error"
                          title={t('errorFetchingQueueRooms', 'Error fetching queue rooms')}
                          subtitle={errorLoadingQueueRooms}
                          onClick={() => {}}
                        />
                      )}
                    </ResponsiveWrapper>
                  </section>
                  <section className={styles.section}>
                    <div className={styles.sectionTitle}>{t('selectAProvider', 'Select a provider')}</div>
                    <ResponsiveWrapper isTablet={isTablet}>
                      <Controller
                        name="provider"
                        control={control}
                        render={({ field }) => (
                          <Select
                            {...field}
                            labelText={''}
                            id="providers-list"
                            name="providers-list"
                            disabled={errorLoadingProviders}
                            invalid={!!errors.provider}
                            invalidText={errors.provider?.message}
                            value={field.value}
                            onChange={(event) => {
                              field.onChange(event.target.value);
                              setSelectedProvider(event.target.value);
                            }}
                          >
                            {!field.value ? (
                              <SelectItem text={t('selectProvider', 'choose a provider')} value="" />
                            ) : null}
                            {providers.map((provider) => (
                              <SelectItem key={provider.uuid} text={provider.display} value={provider.uuid}>
                                {provider.display}
                              </SelectItem>
                            ))}
                          </Select>
                        )}
                      />

                      {errorLoadingProviders && (
                        <InlineNotification
                          className={styles.errorNotification}
                          kind="error"
                          title={t('errorFetchingQueueRooms', 'Error fetching providers')}
                          subtitle={errorLoadingProviders}
                          onClick={() => {}}
                        />
                      )}
                    </ResponsiveWrapper>
                  </section>
                  <section className={styles.section}>
                    <div className={styles.sectionTitle}>{t('notes', 'Notes')}</div>
                    <ResponsiveWrapper isTablet={isTablet}>
                      <Controller
                        name="comment"
                        control={control}
                        render={({ field }) => (
                          <TextArea
                            {...field}
                            aria-label={t('comment', 'Comment')}
                            invalid={!!errors.comment}
                            invalidText={errors.comment?.message}
                            labelText=""
                            id="comment"
                            name="comment"
                            maxCount={500}
                            enableCounter
                            value={field.value}
                          />
                        )}
                      />
                    </ResponsiveWrapper>
                  </section>
                </>
              )}
            </ModalBody>
            <ModalFooter>
              <Button kind="secondary" onClick={closeModal}>
                {t('cancel', 'Cancel')}
              </Button>
              {isEndingVisit ? (
                <InlineLoading description={'Ending...'} />
              ) : (
                <Button kind="danger" onClick={endCurrentVisit}>
                  {t('endVisit', 'End Visit')}
                </Button>
              )}

              {isSubmitting ? (
                <InlineLoading description={'Submitting...'} />
              ) : (
                <Button disabled={!provider || isLoading || isSubmitting} type="submit">
                  {status === QueueStatus.Pending ? 'Save' : 'Move to the next queue room'}
                </Button>
              )}
            </ModalFooter>
          </Form>
        </div>
      </>
    );
  }
};

function ResponsiveWrapper({ children, isTablet }) {
  return isTablet ? <Layer>{children}</Layer> : <div>{children}</div>;
}

export default ChangeStatus;