import { useState } from "react";
import { useNavigate } from "react-router-dom";
import { NutritionOrder } from "fhir/r4";
import { FhirNutritionOrderDisplay } from "../../../../components";
import {
  useFhirNutritionOrderBroadcast,
  useFhirNutritionOrders,
  useFhirNutritionOrderTargetedBroadcast,
} from "../../../../hooks";
import { useAuthServiceContext } from "../../../../services";
import { useViewerIsPatient } from "../../../../hooks";
import { ChevronRight, Edit, FileText, Plus } from "lucide-react";
import { Skeleton } from "../../../../components/ui/skeleton";
import { Button } from "../../../../components/ui/button";
import { Sheet, SheetContent } from "../../../../components/ui/sheet";
import { mayEditRecord } from '../../../../utils/recordEditability';
import { dietLines } from './dietLines';
import { useSeatStanding } from '../../../../utils/seatStanding';

const NutritionOrders = () => {
  const navigate = useNavigate();
  const { userRole, USER_ROLES, practitionerRoles } = useAuthServiceContext();
  const seatStanding = useSeatStanding();
  const viewerIsPatient = useViewerIsPatient();
  // 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, nutritionOrdersList } = useFhirNutritionOrders();
  const [selectedNutritionOrder, setSelectedNutritionOrder] =
    useState<NutritionOrder | null>(null);
  const [showDisplayModal, setShowDisplayModal] = useState<boolean>(false);

  useFhirNutritionOrderBroadcast();
  useFhirNutritionOrderTargetedBroadcast({
    nutritionOrder: selectedNutritionOrder || undefined,
    isOpen: showDisplayModal,
    onUpdate: (updatedNutritionOrder) => {
      setSelectedNutritionOrder(updatedNutritionOrder);
    },
    onDelete: () => {
      setShowDisplayModal(false);
      setSelectedNutritionOrder(null);
    },
  });

  const viewNutritionOrder = (nutritionOrder: NutritionOrder) => {
    setSelectedNutritionOrder(nutritionOrder);
    setShowDisplayModal(true);
  };

  const editNutritionOrder = (
    event: React.MouseEvent,
    nutritionOrder: NutritionOrder,
  ) => {
    event.stopPropagation();
    navigate(nutritionOrder.id as string, { relative: "path" });
  };

  const addNutritionOrder = () => {
    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 NutritionOrder 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: 'NutritionOrder',
      viewerIsStaff: Boolean(userRole)
          && ![USER_ROLES.PATIENT, USER_ROLES.RELATED_PERSON].includes(userRole as string),
      practitionerRoles,
  });

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

  const getOrderDetails = (nutritionOrder: NutritionOrder): string => {
    const details = [];

    if (nutritionOrder.oralDiet) {
      details.push("Oral Diet");
    }

    if (nutritionOrder.supplement && nutritionOrder.supplement.length > 0) {
      details.push(
        `${nutritionOrder.supplement.length} Supplement${
          nutritionOrder.supplement.length !== 1 ? "s" : ""
        }`,
      );
    }

    if (nutritionOrder.enteralFormula) {
      details.push("Enteral Formula");
    }

    return details.join(", ");
  };

  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 ? "Diet & nutrition" : "Nutrition Orders"}
          </h2>
          <p className="text-sm">
            {viewerIsPatient
              ? 'Track and manage your personalized nutrition plans defined by your care team.'
              : "Track and manage this patient's nutrition plans, defined by their care team."}
          </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={addNutritionOrder}>
              <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 Nutrition Orders
            </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 && nutritionOrdersList.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 Nutrition Orders found
          </p>
          <p>
            {viewerIsPatient
              ? 'You have no active nutrition orders.'
              : 'No nutrition orders yet. Add an order for this patient.'}
          </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>
      ) : (
        nutritionOrdersList.length !== 0 && (
          <div className="space-y-2 mt-3">
            {nutritionOrdersList.map((nutritionOrder: NutritionOrder) => {
              const orderDetails = getOrderDetails(nutritionOrder);
              // - 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={nutritionOrder.id}
                  role="button"
                  tabIndex={0}
                  onClick={() => viewNutritionOrder(nutritionOrder)}
                  onKeyDown={(event: React.KeyboardEvent) => {
                    if (event.key !== 'Enter' && event.key !== ' ') return;
                    event.preventDefault();
                    viewNutritionOrder(nutritionOrder);
                  }}
                >
                  <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">
                        {orderDetails} -{" "}
                        {nutritionOrder?.resourceType
                          ? nutritionOrder.resourceType
                              .replace(/([A-Z])/g, " $1")
                              .trim()
                          : "Nutrition name not available"}
                        <span className="text-xs bg-green-600 font-normal capitalize rounded p-0.5 px-2 text-white">
                          {nutritionOrder.status
                            ? nutritionOrder.status
                            : "Status unknown"}
                        </span>
                      </p>
                      {dietLines(nutritionOrder).length
                        ? dietLines(nutritionOrder).map((line, index) => (
                            <p key={index} className="text-xs text-secondary">
                              {line}
                            </p>
                          ))
                        : <p className="text-xs text-secondary">No diet details recorded</p>}
                    </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) =>
                          editNutritionOrder(event, nutritionOrder)
                        }
                        variant="outline"
                      >
                        <Edit /> Edit
                      </Button>
                    </div>
                  )}
                </div>
              );
            })}
          </div>
        )
      )}

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

export default NutritionOrders;

// import { useNavigate } from 'react-router-dom';
// import { NutritionOrder } from 'fhir/r4';
// import { AppSpinner, FhirNutritionOrderDisplay, ScrollableTab } from '../../../../components';
// import {
// useFhirNutritionOrderBroadcast,
// useFhirNutritionOrders,
// useFhirNutritionOrderTargetedBroadcast
// } from '../../../../hooks';
// import { useAuthServiceContext, useNutritionOrderServiceContext } from '../../../../services';

// const NutritionOrders = () => {
// const navigate = useNavigate();
// const { userRole, USER_ROLES } = useAuthServiceContext();
// const { getNutritionOrderDisplay } = useNutritionOrderServiceContext();
// const { loading, error, clearError, nutritionOrdersList } = useFhirNutritionOrders();
// const [isGuideOpen, setIsGuideOpen] = useState<boolean>(false);
// const [selectedNutritionOrder, setSelectedNutritionOrder] = useState<NutritionOrder | null>(null);
// const [showDisplayModal, setShowDisplayModal] = useState<boolean>(false);
// const spacerMargin = '24px';

// useFhirNutritionOrderBroadcast();
// useFhirNutritionOrderTargetedBroadcast({
// nutritionOrder: selectedNutritionOrder || undefined,
// isOpen: showDisplayModal,
// onUpdate: (updatedNutritionOrder) => {
// setSelectedNutritionOrder(updatedNutritionOrder);
// },
// onDelete: () => {
// setShowDisplayModal(false);
// setSelectedNutritionOrder(null);
// }
// });

// const viewNutritionOrder = (nutritionOrder: NutritionOrder) => {
// setSelectedNutritionOrder(nutritionOrder);
// setShowDisplayModal(true);
// };

// const editNutritionOrder = (event: React.MouseEvent, nutritionOrder: NutritionOrder) => {
// event.stopPropagation();
// navigate(nutritionOrder.id as string, { relative: 'path' });
// };

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

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

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

// switch (nutritionOrder.status) {
// case 'active':
// return { text: 'Active', color: '#00a32a' };
// case 'draft':
// return { text: 'Draft', color: '#757575' };
// case 'on-hold':
// return { text: 'On Hold', color: '#e39700' };
// case 'revoked':
// return { text: 'Revoked', color: '#cc1818' };
// case 'completed':
// return { text: 'Completed', color: '#4f94d4' };
// case 'entered-in-error':
// return { text: 'Error', color: '#cc1818' };
// case 'unknown':
// default:
// return { text: nutritionOrder.status?.charAt(0).toUpperCase() + nutritionOrder.status?.slice(1) || 'Unknown' };
// }
// };

// const getOrderDetails = (nutritionOrder: NutritionOrder): string => {
// const details = [];

// if (nutritionOrder.oralDiet) {
// details.push('Oral Diet');
// }

// if (nutritionOrder.supplement && nutritionOrder.supplement.length > 0) {
// details.push(`${nutritionOrder.supplement.length} Supplement${nutritionOrder.supplement.length !== 1 ? 's': ''}`);
// }

// if (nutritionOrder.enteralFormula) {
// details.push('Enteral Formula');
// }

// return details.join(', ');
// };

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

// <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={addNutritionOrder}>
// Add
// </Button>
// </FlexItem>
// )}
// </Flex>
// <Spacer margin="8"/>

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

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

// {!loading && nutritionOrdersList.length === 0 && (
// <>
// <Notice status="info" isDismissible={false}>
// No nutrition orders found.
// </Notice>

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

// <>
// {loading ? (
// <AppSpinner/>
// ): (
// <ScrollableTab>
// {nutritionOrdersList.length !== 0 && (
// <ItemGroup isBordered isSeparated isRounded size='large'>
// {nutritionOrdersList.map((nutritionOrder: NutritionOrder) => {
// const displayTitle = getNutritionOrderDisplay(nutritionOrder);
// const { text: statusText, color: statusColor } = getStatusDisplay(nutritionOrder);
// const orderDetails = getOrderDetails(nutritionOrder);

// return (
// <Item key={nutritionOrder.id}
// onClick={() => viewNutritionOrder(nutritionOrder)}>
// <Flex>
// <FlexItem>
// <Icon icon={info}
// size={24}
// style={{
// marginRight: 12,
// color: statusColor
// }}/>
// </FlexItem>
// <FlexBlock>
// <Flex align="center" justify="space-between">
// <FlexItem>
// <Text style={{ fontWeight: 500 }}>
// {displayTitle}
// </Text>
// {orderDetails && (
// <Text variant="muted" style={{ display: 'block' }}>
// {orderDetails}
// </Text>
// )}
// </FlexItem>
// {isAuthorizedToEdit() && (
// <FlexItem>
// <Button
// variant="secondary"
// size="small"
// icon={edit}
// onClick={(event: React.MouseEvent) => editNutritionOrder(event, nutritionOrder)}
// >
// Edit
// </Button>
// </FlexItem>
// )}
// </Flex>
// </FlexBlock>
// </Flex>
// </Item>
// );
// })}
// </ItemGroup>
// )}
// </ScrollableTab>
// )}
// </>

// {selectedNutritionOrder && (
// <FhirNutritionOrderDisplay
// nutritionOrder={selectedNutritionOrder}
// isOpen={showDisplayModal}
// onClose={() => {
// setShowDisplayModal(false);
// setSelectedNutritionOrder(null);
// }}
// />
// )}
// </View>
// );
// };

// export default NutritionOrders;