import { useState } from "react";
import { useNavigate } from "react-router-dom";
import { VisionPrescription } from "fhir/r4";
import { FhirVisionPrescriptionDisplay } from "../../../../components";
import {
  useFhirVisionPrescriptionBroadcast,
  useFhirVisionPrescriptions,
  useFhirVisionPrescriptionTargetedBroadcast,
} from "../../../../hooks";
import {
  useAuthServiceContext,
} from "../../../../services";
import { Button } from "../../../../components/ui/button";
import {
  Calendar,
  ChevronRight,
  Edit,
  Eye,
  FileText,
  Layers,
  Plus,
  UserRoundPlus,
} from "lucide-react";
import { Skeleton } from "../../../../components/ui/skeleton";
import { formatDateForDisplay } from "../../../../lib/utils";
import { Sheet, SheetContent } from "../../../../components/ui/sheet";
import { mayEditRecord } from '../../../../utils/recordEditability';
import { useSeatStanding } from '../../../../utils/seatStanding';

const VisionPrescriptions = () => {
  const navigate = useNavigate();
  const { userRole, USER_ROLES, practitionerRoles } = useAuthServiceContext();
  const seatStanding = useSeatStanding();
  // The nav row that opens this page says one thing and the page said another. A clinician reading
  // the same page through the chart is a different audience and keeps their own wording.
  const isPatientOrProxy = [USER_ROLES.PATIENT, USER_ROLES.RELATED_PERSON].includes(userRole as string);
  const { loading, error, visionPrescriptionsList } =
    useFhirVisionPrescriptions();
  const [selectedVisionPrescription, setSelectedVisionPrescription] =
    useState<VisionPrescription | null>(null);
  const [showDisplayModal, setShowDisplayModal] = useState<boolean>(false);

  useFhirVisionPrescriptionBroadcast();
  useFhirVisionPrescriptionTargetedBroadcast({
    visionPrescription: selectedVisionPrescription || undefined,
    isOpen: showDisplayModal,
    onUpdate: (updatedVisionPrescription) => {
      setSelectedVisionPrescription(updatedVisionPrescription);
    },
    onDelete: () => {
      setShowDisplayModal(false);
      setSelectedVisionPrescription(null);
    },
  });

  const viewVisionPrescription = (visionPrescription: VisionPrescription) => {
    setSelectedVisionPrescription(visionPrescription);
    setShowDisplayModal(true);
  };

  const editVisionPrescription = (
    event: React.MouseEvent,
    visionPrescription: VisionPrescription,
  ) => {
    event.stopPropagation();
    navigate(visionPrescription.id as string, { relative: "path" });
  };

  const addVisionPrescription = () => {
    navigate("new", { relative: "path" });
  };

  const roleAllowsEdit = () => {
    return userRole && [USER_ROLES.PRACTITIONER].includes(userRole as string);
  };

  /*
   * AND THE ROLE IS NOT THE RULE THE SERVER APPLIES.
   *
   * Writing a VisionPrescription needs a paid clinician seat, resolved per request by `callerMayWrite`. The role
   * check above passes for an unseated practitioner - a medical assistant, a nurse rooming patients,
   * somebody whose seat was turned off this morning - so the page offered Add and Edit, and the save
   * came back refused. A refusal that arrives after the typing has already spent the work.
   */
  const seat = mayEditRecord({ seatStanding,
      resourceType: 'VisionPrescription',
      viewerIsStaff: Boolean(userRole)
          && ![USER_ROLES.PATIENT, USER_ROLES.RELATED_PERSON].includes(userRole as string),
      practitionerRoles,
  });

  const isAuthorizedToEdit = () => roleAllowsEdit() && seat.mayEdit;

  const getLensCount = (visionPrescription: VisionPrescription): number => {
    return visionPrescription.lensSpecification?.length || 0;
  };

  return (
    <div>
      <div className="flex justify-between items-center">
        <div className="mb-2 lg:mb-0 sm:mb-0">
          <h2 className="font-bold text-xl">
            {isPatientOrProxy ? "Glasses & contacts" : "Vision Prescriptions"}
          </h2>
          <p className="text-sm">
            Manage vision prescriptions, lens specifications, and corrective
            lens details.
          </p>
        </div>
        <div className="flex justify-end text-end">
          {/* SAID, NOT WITHHELD. A control that simply disappears reads as a broken screen or as a
              permission the reader has lost, and both send them to an administrator to check permissions
              that are already correct. A seat is nameable, and a practice can enable one in a minute. */}
          {roleAllowsEdit() && !seat.mayEdit && (
              <p className="text-sm text-secondary max-w-[22rem] text-right">{seat.reason}</p>
          )}
          {isAuthorizedToEdit() && (
            <Button onClick={addVisionPrescription}>
              <Plus />
              Add
            </Button>
          )}
        </div>
      </div>

      {error ? (
        <div className="flex flex-col items-center font-normal justify-center p-8 text-center space-y-5 pt-[100px]">
          <FileText strokeWidth={1} size={50} className="mx-auto mb-5" />{" "}
          <div>
            <h3 className="text-lg font-semibold mb-3">
              Could not load Vision Prescriptions
            </h3>
            <p className="text-muted-foreground">Try again later.</p>
          </div>
          <Button
            className="cursor-pointer bg-primary rounded p-2 text-white hover:bg-primary/80 px-4"
            onClick={() => window.location.reload()}
          >
            Retry
          </Button>
        </div>
      ) : !loading && visionPrescriptionsList.length === 0 ? (
        <div className="p-4 items-center justify-center text-center space-y-4 m-auto pt-[100px]">
          <FileText strokeWidth={1} size={50} className="mx-auto mb-5" />
          <p className="text-lg font-bold">
            No Vision Prescriptions found
          </p>
          <p>
            You have no active vision prescriptions.
          </p>
        </div>
      ) : loading ? (
        <div className="space-y-2 mt-3">
          {[...Array(7)].map((_, index) => (
            <div
              key={index}
              className="flex justify-between gap-3 items-center rounded p-1 animate-pulse"
            >
              <div className="space-y-2 w-3/4 items-center">
                <div className="flex items-center gap-4">
                  <Skeleton className="h-5 w-full rounded"></Skeleton>
                  <Skeleton className="h-5 w-full rounded"></Skeleton>
                </div>
                <Skeleton className="h-4 w-full rounded"></Skeleton>
              </div>
              <Skeleton className="h-12 w-12 rounded-full"></Skeleton>
            </div>
          ))}
        </div>
      ) : (
        visionPrescriptionsList.length !== 0 && (
          <div className="space-y-2 mt-3">
            {visionPrescriptionsList.map(
              (visionPrescription: VisionPrescription) => {
                const lensCount = getLensCount(visionPrescription);

                // - the row IS the control, so it must be reachable without a pointer.
                // Enter and Space both, because role="button" promises both.
                return (
                  <div
                    className="focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 flex gap-2 justify-between items-center"
                    key={visionPrescription.id}
                    role="button"
                    tabIndex={0}
                    onClick={() => viewVisionPrescription(visionPrescription)}
                    onKeyDown={(event: React.KeyboardEvent) => {
                      if (event.key !== 'Enter' && event.key !== ' ') return;
                      event.preventDefault();
                      viewVisionPrescription(visionPrescription);
                    }}
                  >
                    <div className="flex w-full justify-between gap-3 group items-center cursor-pointer rounded p-2 hover:bg-muted">
                      <div className="space-y-2">
                        <p className="font-bold flex gap-4 items-center text-lg">
                          {visionPrescription?.resourceType
                            ? visionPrescription.resourceType
                                .replace(/([A-Z])/g, " $1")
                                .trim()
                            : "Prescription name not available"}
                          <span className="text-xs bg-green-600 font-normal capitalize rounded p-0.5 px-2 text-white">
                            {visionPrescription.status
                              ? visionPrescription.status
                              : "Status unknown"}
                          </span>
                        </p>
                        {visionPrescription.prescriber?.display ? (
                          <p className="text-xs text-secondary flex gap-2">
                            <UserRoundPlus size={14} /> Practitioner -{" "}
                            {visionPrescription.prescriber?.display}
                          </p>
                        ) : (
                          "Practitioner not available"
                        )}
                        <div className="flex gap-2">
                          {lensCount > 0 && (
                            <span className="text-xs flex gap-1 items-center bg-[var(--cat-task-soft)] font-normal capitalize rounded p-0.5 px-2 text-[var(--cat-task)]">
                              <Layers size={14} /> {lensCount} lens spec
                              {lensCount !== 1 ? "s" : ""}
                            </span>
                          )}
                          {visionPrescription?.lensSpecification?.map(
                            (vision, index) => (
                              <span
                                key={index}
                                className="flex gap-1 items-center text-xs bg-[var(--cat-task-soft)] font-normal capitalize rounded p-0.5 px-2 text-[var(--cat-task)]"
                              >
                                <Eye size={14} /> OD ({vision?.eye})
                              </span>
                            ),
                          )}
                          {visionPrescription?.dateWritten && (
                            <span className="flex gap-1 items-center text-xs bg-[var(--cat-task-soft)] font-normal capitalize rounded p-0.5 px-2 text-[var(--cat-task)]">
                              <Calendar size={14} />{" "}
                              {formatDateForDisplay(
                                visionPrescription?.dateWritten,
                              )}
                            </span>
                          )}
                        </div>
                      </div>
                      <div className="text-secondary group-hover:text-foreground transition-colors flex gap-2">
                        <ChevronRight size={30} strokeWidth={1} />
                      </div>
                    </div>
                    {isAuthorizedToEdit() && (
                      <div>
                        <Button
                          onClick={(event: React.MouseEvent) =>
                            editVisionPrescription(event, visionPrescription)
                          }
                          variant="outline"
                        >
                          <Edit /> Edit
                        </Button>
                      </div>
                    )}
                  </div>
                );
              },
            )}
          </div>
        )
      )}

      {selectedVisionPrescription && (
        <Sheet
          open={!!selectedVisionPrescription}
          onOpenChange={(open) => {
            if (!open) setSelectedVisionPrescription(null);
          }}
        >
          <SheetContent className="sm:max-w-[700px] sm:min-w-[700px] w-full max-w-full">
            <FhirVisionPrescriptionDisplay
              visionPrescription={selectedVisionPrescription}
              isOpen={showDisplayModal}
              onClose={() => {
                setShowDisplayModal(false);
                setSelectedVisionPrescription(null);
              }}
            />
          </SheetContent>
        </Sheet>
      )}
    </div>
  );
};

export default VisionPrescriptions;

// import { useNavigate } from 'react-router-dom';
// import { VisionPrescription } from 'fhir/r4';
// import { AppSpinner, FhirVisionPrescriptionDisplay, ScrollableTab } from '../../../../components';
// import {
// useFhirVisionPrescriptionBroadcast,
// useFhirVisionPrescriptions,
// useFhirVisionPrescriptionTargetedBroadcast
// } from '../../../../hooks';
// import { useAuthServiceContext, useVisionPrescriptionServiceContext } from '../../../../services';

// const VisionPrescriptions = () => {
// const navigate = useNavigate();
// const { userRole, USER_ROLES } = useAuthServiceContext();
// const { getVisionPrescriptionDisplay } = useVisionPrescriptionServiceContext();
// const { loading, error, clearError, visionPrescriptionsList } = useFhirVisionPrescriptions();
// const [isGuideOpen, setIsGuideOpen] = useState<boolean>(false);
// const [selectedVisionPrescription, setSelectedVisionPrescription] = useState<VisionPrescription | null>(null);
// const [showDisplayModal, setShowDisplayModal] = useState<boolean>(false);
// const spacerMargin = '24px';

// useFhirVisionPrescriptionBroadcast();
// useFhirVisionPrescriptionTargetedBroadcast({
// visionPrescription: selectedVisionPrescription || undefined,
// isOpen: showDisplayModal,
// onUpdate: (updatedVisionPrescription) => {
// setSelectedVisionPrescription(updatedVisionPrescription);
// },
// onDelete: () => {
// setShowDisplayModal(false);
// setSelectedVisionPrescription(null);
// }
// });

// const viewVisionPrescription = (visionPrescription: VisionPrescription) => {
// setSelectedVisionPrescription(visionPrescription);
// setShowDisplayModal(true);
// };

// const editVisionPrescription = (event: React.MouseEvent, visionPrescription: VisionPrescription) => {
// event.stopPropagation();
// navigate(visionPrescription.id as string, { relative: 'path' });
// };

// const addVisionPrescription = () => {
// navigate('new', { relative: 'path' });
// };

// const isAuthorizedToEdit = () => {
// return userRole && [USER_ROLES.PRACTITIONER].includes(userRole as string);
// };

// const getStatusDisplay = (visionPrescription: VisionPrescription): { text: string, color?: string } => {
// if (!visionPrescription) return { text: 'Unknown' };

// switch (visionPrescription.status) {
// case 'active':
// return { text: 'Active', color: '#00a32a' };
// case 'cancelled':
// return { text: 'Cancelled', color: '#cc1818' };
// case 'draft':
// return { text: 'Draft', color: '#757575' };
// case 'entered-in-error':
// return { text: 'Error', color: '#cc1818' };
// default:
// return { text: visionPrescription.status?.charAt(0).toUpperCase() + visionPrescription.status?.slice(1) || 'Unknown' };
// }
// };

// const getLensCount = (visionPrescription: VisionPrescription): number => {
// return visionPrescription.lensSpecification?.length || 0;
// };

// return (
// <View>
// <FhirGuide isOpen={isGuideOpen}
// onFinish={() => setIsGuideOpen(false)}
// resourceType="VisionPrescription"/>

// <Flex align="center" justify="space-between">
// <FlexBlock>
// </FlexBlock>
// <FlexItem>
// <Button variant="primary"
// icon={info}
// onClick={() => setIsGuideOpen(true)}>
// Help
// </Button>
// </FlexItem>
// {isAuthorizedToEdit() && (
// <FlexItem>
// <Button variant="primary"
// icon={plus}
// onClick={addVisionPrescription}>
// Add
// </Button>
// </FlexItem>
// )}
// </Flex>
// <Spacer margin="8"/>

// {error && (
// <>
// <Notice status="error" onRemove={clearError}>
// {error}
// </Notice>

// <Spacer margin={spacerMargin}/>
// </>
// )}

// {!loading && visionPrescriptionsList.length === 0 && (
// <>
// <Notice status="info" isDismissible={false}>
// No vision prescriptions found.
// </Notice>

// <Spacer margin={spacerMargin}/>
// </>
// )}

// <>
// {loading ? (
// <AppSpinner/>
// ): (
// <ScrollableTab>
// {visionPrescriptionsList.length !== 0 && (
// <ItemGroup isBordered isSeparated isRounded size='large'>
// {visionPrescriptionsList.map((visionPrescription: VisionPrescription) => {
// const displayTitle = getVisionPrescriptionDisplay(visionPrescription);
// const { text: statusText, color: statusColor } = getStatusDisplay(visionPrescription);
// const lensCount = getLensCount(visionPrescription);

// return (
// <Item key={visionPrescription.id}
// onClick={() => viewVisionPrescription(visionPrescription)}>
// <Flex>
// <FlexItem>
// <Icon icon={seen}
// size={24}
// style={{
// marginRight: 12,
// color: statusColor
// }}/>
// </FlexItem>
// <FlexBlock>
// <Flex align="center" justify="space-between">
// <FlexItem>
// <Text style={{ fontWeight: 500 }}>
// {displayTitle}
// </Text>
// {lensCount > 0 && (
// <Text variant="muted" style={{ display: 'block' }}>
// {lensCount} lens specification{lensCount !== 1 ? 's': ''}
// </Text>
// )}
// </FlexItem>
// {isAuthorizedToEdit() && (
// <FlexItem>
// <Button
// variant="secondary"
// size="small"
// icon={edit}
// onClick={(event: React.MouseEvent) => editVisionPrescription(event, visionPrescription)}
// >
// Edit
// </Button>
// </FlexItem>
// )}
// </Flex>
// </FlexBlock>
// </Flex>
// </Item>
// );
// })}
// </ItemGroup>
// )}
// </ScrollableTab>
// )}
// </>

// {selectedVisionPrescription && (
// <FhirVisionPrescriptionDisplay
// visionPrescription={selectedVisionPrescription}
// isOpen={showDisplayModal}
// onClose={() => {
// setShowDisplayModal(false);
// setSelectedVisionPrescription(null);
// }}
// />
// )}
// </View>
// );
// };

// export default VisionPrescriptions;