import React, { useCallback, useEffect, useState } from "react";
// next
import { useRouter } from "next/router";
// swr
import useSWR from "swr";
// react beautiful dnd
import type { DropResult } from "react-beautiful-dnd";
import { DragDropContext } from "react-beautiful-dnd";
// services
import stateServices from "lib/services/state.services";
import issuesServices from "lib/services/issues.services";
// hooks
import useUser from "lib/hooks/useUser";
// fetching keys
import { STATE_LIST } from "constants/fetch-keys";
// components
import SingleBoard from "components/project/issues/BoardView/SingleBoard";
import StrictModeDroppable from "components/dnd/StrictModeDroppable";
import CreateUpdateIssuesModal from "components/project/issues/CreateUpdateIssueModal";
// ui
import { Spinner } from "ui";
// types
import type { IState, IIssue, Properties, NestedKeyOf, ProjectMember } from "types";

type Props = {
  properties: Properties;
  selectedGroup: NestedKeyOf<IIssue> | null;
  groupedByIssues: {
    [key: string]: IIssue[];
  };
  members: ProjectMember[] | undefined;
};

const BoardView: React.FC<Props> = ({ properties, selectedGroup, groupedByIssues, members }) => {
  const [isOpen, setIsOpen] = useState(false);

  const [isIssueOpen, setIsIssueOpen] = useState(false);

  const [preloadedData, setPreloadedData] = useState<
    (Partial<IIssue> & { actionType: "createIssue" | "edit" | "delete" }) | undefined
  >(undefined);

  const { activeWorkspace } = useUser();

  const router = useRouter();

  const { projectId } = router.query;

  const { data: states, mutate: mutateState } = useSWR<IState[]>(
    projectId && activeWorkspace ? STATE_LIST(projectId as string) : null,
    activeWorkspace
      ? () => stateServices.getStates(activeWorkspace.slug, projectId as string)
      : null
  );

  const handleOnDragEnd = useCallback(
    (result: DropResult) => {
      if (!result.destination) return;
      const { source, destination, type } = result;

      if (type === "state") {
        const newStates = Array.from(states ?? []);
        const [reorderedState] = newStates.splice(source.index, 1);
        newStates.splice(destination.index, 0, reorderedState);
        const prevSequenceNumber = newStates[destination.index - 1]?.sequence;
        const nextSequenceNumber = newStates[destination.index + 1]?.sequence;

        const sequenceNumber =
          prevSequenceNumber && nextSequenceNumber
            ? (prevSequenceNumber + nextSequenceNumber) / 2
            : nextSequenceNumber
            ? nextSequenceNumber - 15000 / 2
            : prevSequenceNumber
            ? prevSequenceNumber + 15000 / 2
            : 15000;

        newStates[destination.index].sequence = sequenceNumber;

        mutateState(newStates, false);
        if (!activeWorkspace) return;
        stateServices
          .patchState(activeWorkspace.slug, projectId as string, newStates[destination.index].id, {
            sequence: sequenceNumber,
          })
          .then((response) => {
            console.log(response);
          })
          .catch((err) => {
            console.error(err);
          });
      } else {
        if (source.droppableId !== destination.droppableId) {
          const sourceGroup = source.droppableId; // source group id
          const destinationGroup = destination.droppableId; // destination group id
          if (!sourceGroup || !destinationGroup) return;

          // removed/dragged item
          const removedItem = groupedByIssues[source.droppableId][source.index];

          if (selectedGroup === "priority") {
            // update the removed item for mutation
            removedItem.priority = destinationGroup;

            // patch request
            issuesServices.patchIssue(activeWorkspace!.slug, projectId as string, removedItem.id, {
              priority: destinationGroup,
            });
          } else if (selectedGroup === "state_detail.name") {
            const destinationState = states?.find((s) => s.name === destinationGroup);
            const destinationStateId = destinationState?.id;

            // update the removed item for mutation
            if (!destinationStateId || !destinationState) return;
            removedItem.state = destinationStateId;
            removedItem.state_detail = destinationState;

            // patch request
            issuesServices.patchIssue(activeWorkspace!.slug, projectId as string, removedItem.id, {
              state: destinationStateId,
            });
          }

          // remove item from the source group
          groupedByIssues[source.droppableId].splice(source.index, 1);
          // add item to the destination group
          groupedByIssues[destination.droppableId].splice(destination.index, 0, removedItem);
        }
      }
    },
    [activeWorkspace, mutateState, groupedByIssues, projectId, selectedGroup, states]
  );

  useEffect(() => {
    if (isOpen) return;
    const timer = setTimeout(() => {
      setPreloadedData(undefined);
      clearTimeout(timer);
    }, 500);
  }, [isOpen]);

  return (
    <>
      {/* <CreateUpdateStateModal
        isOpen={
          isOpen &&
          preloadedData?.actionType !== "delete" &&
          preloadedData?.actionType !== "createIssue"
        }
        setIsOpen={setIsOpen}
        data={preloadedData as Partial<IIssue>}
        projectId={projectId as string}
      /> */}
      {/* <ConfirmStateDeletion
        isOpen={isOpen && preloadedData?.actionType === "delete"}
        setIsOpen={setIsOpen}
        data={preloadedData as Partial<IIssue>}
      /> */}
      <CreateUpdateIssuesModal
        isOpen={isIssueOpen && preloadedData?.actionType === "createIssue"}
        setIsOpen={setIsIssueOpen}
        prePopulateData={{
          ...preloadedData,
        }}
        projectId={projectId as string}
      />
      {groupedByIssues ? (
        groupedByIssues ? (
          <div className="w-full" style={{ height: "calc(82vh - 1.5rem)" }}>
            <DragDropContext onDragEnd={handleOnDragEnd}>
              <div className="h-full w-full overflow-hidden">
                <StrictModeDroppable droppableId="state" type="state" direction="horizontal">
                  {(provided) => (
                    <div
                      className="h-full w-full"
                      {...provided.droppableProps}
                      ref={provided.innerRef}
                    >
                      <div className="flex gap-x-4 h-full overflow-x-auto overflow-y-hidden pb-3">
                        {Object.keys(groupedByIssues).map((singleGroup, index) => (
                          <SingleBoard
                            key={singleGroup}
                            selectedGroup={selectedGroup}
                            groupTitle={singleGroup}
                            createdBy={
                              members
                                ? members?.find((m) => m.member.id === singleGroup)?.member
                                    .first_name
                                : undefined
                            }
                            groupedByIssues={groupedByIssues}
                            index={index}
                            setIsIssueOpen={setIsIssueOpen}
                            properties={properties}
                            setPreloadedData={setPreloadedData}
                            stateId={
                              selectedGroup === "state_detail.name"
                                ? states?.find((s) => s.name === singleGroup)?.id
                                : undefined
                            }
                            bgColor={
                              selectedGroup === "state_detail.name"
                                ? states?.find((s) => s.name === singleGroup)?.color
                                : undefined
                            }
                          />
                        ))}
                      </div>
                      {provided.placeholder}
                    </div>
                  )}
                </StrictModeDroppable>
              </div>
            </DragDropContext>
          </div>
        ) : null
      ) : (
        <div className="w-full h-full flex justify-center items-center">
          <Spinner />
        </div>
      )}
    </>
  );
};

export default BoardView;