import { FC, useCallback, useEffect, useRef, useState } from "react";
import { combine } from "@atlaskit/pragmatic-drag-and-drop/combine";
import { dropTargetForElements } from "@atlaskit/pragmatic-drag-and-drop/element/adapter";
import { autoScrollForElements } from "@atlaskit/pragmatic-drag-and-drop-auto-scroll/element";
import { observer } from "mobx-react-lite";
import { useRouter } from "next/router";
import { TIssue } from "@plane/types";
import { Spinner, TOAST_TYPE, setToast } from "@plane/ui";
import { DeleteIssueModal } from "@/components/issues";
import { ISSUE_DELETED } from "@/constants/event-tracker";
import { EIssueFilterType, EIssuesStoreType } from "@/constants/issue";
import { EUserProjectRoles } from "@/constants/project";
// hooks
import { useEventTracker, useIssueDetail, useIssues, useKanbanView, useUser } from "@/hooks/store";
import { useIssuesActions } from "@/hooks/use-issues-actions";
// store
import { ISSUE_FILTER_DEFAULT_DATA } from "@/store/issue/helpers/issue-helper.store";
// ui
// types
import { IQuickActionProps, TRenderQuickActions } from "../list/list-view-types";
//components
import { GroupDropLocation, handleGroupDragDrop, getSourceFromDropPayload } from "../utils";
import { KanBan } from "./default";
import { KanBanSwimLanes } from "./swimlanes";


export type KanbanStoreType =
  | EIssuesStoreType.PROJECT
  | EIssuesStoreType.MODULE
  | EIssuesStoreType.CYCLE
  | EIssuesStoreType.PROJECT_VIEW
  | EIssuesStoreType.DRAFT
  | EIssuesStoreType.PROFILE;
export interface IBaseKanBanLayout {
  QuickActions: FC<IQuickActionProps>;
  showLoader?: boolean;
  viewId?: string;
  storeType: KanbanStoreType;
  addIssuesToView?: (issueIds: string[]) => Promise<any>;
  canEditPropertiesBasedOnProject?: (projectId: string) => boolean;
  isCompletedCycle?: boolean;
}

export const BaseKanBanRoot: React.FC<IBaseKanBanLayout> = observer((props: IBaseKanBanLayout) => {
  const {
    QuickActions,
    showLoader,
    viewId,
    storeType,
    addIssuesToView,
    canEditPropertiesBasedOnProject,
    isCompletedCycle = false,
  } = props;
  // router
  const router = useRouter();
  const { workspaceSlug, projectId } = router.query;
  // store hooks
  const {
    membership: { currentProjectRole },
  } = useUser();
  const { captureIssueEvent } = useEventTracker();
  const { issueMap, issuesFilter, issues } = useIssues(storeType);
  const {
    issue: { getIssueById },
  } = useIssueDetail();
  const { updateIssue, removeIssue, removeIssueFromView, archiveIssue, restoreIssue, updateFilters } =
    useIssuesActions(storeType);
  const {
    issues: { addCycleToIssue, removeCycleFromIssue },
  } = useIssues(EIssuesStoreType.CYCLE);
  const {
    issues: { changeModulesInIssue },
  } = useIssues(EIssuesStoreType.MODULE);

  const deleteAreaRef = useRef<HTMLDivElement | null>(null);
  const [isDragOverDelete, setIsDragOverDelete] = useState(false);

  const { isDragging } = useKanbanView();

  const issueIds = issues?.groupedIssueIds || [];

  const displayFilters = issuesFilter?.issueFilters?.displayFilters;
  const displayProperties = issuesFilter?.issueFilters?.displayProperties;

  const sub_group_by = displayFilters?.sub_group_by;
  const group_by = displayFilters?.group_by;

  const orderBy = displayFilters?.order_by;

  const userDisplayFilters = displayFilters || null;

  const KanBanView = sub_group_by ? KanBanSwimLanes : KanBan;

  const { enableInlineEditing, enableQuickAdd, enableIssueCreation } = issues?.viewFlags || {};

  const scrollableContainerRef = useRef<HTMLDivElement | null>(null);

  // states
  const [draggedIssueId, setDraggedIssueId] = useState<string | undefined>(undefined);
  const [deleteIssueModal, setDeleteIssueModal] = useState(false);

  const isEditingAllowed = !!currentProjectRole && currentProjectRole >= EUserProjectRoles.MEMBER;

  const canEditProperties = useCallback(
    (projectId: string | undefined) => {
      const isEditingAllowedBasedOnProject =
        canEditPropertiesBasedOnProject && projectId ? canEditPropertiesBasedOnProject(projectId) : isEditingAllowed;

      return enableInlineEditing && isEditingAllowedBasedOnProject;
    },
    [canEditPropertiesBasedOnProject, enableInlineEditing, isEditingAllowed]
  );

  // Enable Auto Scroll for Main Kanban
  useEffect(() => {
    const element = scrollableContainerRef.current;

    if (!element) return;

    return combine(
      autoScrollForElements({
        element,
      })
    );
  }, [scrollableContainerRef?.current]);

  // Make the Issue Delete Box a Drop Target
  useEffect(() => {
    const element = deleteAreaRef.current;

    if (!element) return;

    return combine(
      dropTargetForElements({
        element,
        getData: () => ({ columnId: "issue-trash-box", groupId: "issue-trash-box", type: "DELETE" }),
        onDragEnter: () => {
          setIsDragOverDelete(true);
        },
        onDragLeave: () => {
          setIsDragOverDelete(false);
        },
        onDrop: (payload) => {
          setIsDragOverDelete(false);
          const source = getSourceFromDropPayload(payload);

          if (!source) return;

          setDraggedIssueId(source.id);
          setDeleteIssueModal(true);
        },
      })
    );
  }, [deleteAreaRef?.current, setIsDragOverDelete, setDraggedIssueId, setDeleteIssueModal]);

  /**
   * update Issue on Drop, checks if modules or cycles are changed and then calls appropriate functions
   * @param projectId
   * @param issueId
   * @param data
   * @param issueUpdates
   */
  const updateIssueOnDrop = async (
    projectId: string,
    issueId: string,
    data: Partial<TIssue>,
    issueUpdates: {
      [groupKey: string]: {
        ADD: string[];
        REMOVE: string[];
      };
    }
  ) => {

    const errorToastProps = {
      type: TOAST_TYPE.ERROR,
      title: "Error!",
      message: "Error while updating issue"
    }
    const moduleKey = ISSUE_FILTER_DEFAULT_DATA["module"];
    const cycleKey = ISSUE_FILTER_DEFAULT_DATA["cycle"];

    const isModuleChanged = Object.keys(data).includes(moduleKey);
    const isCycleChanged = Object.keys(data).includes(cycleKey);

    if (isCycleChanged && workspaceSlug) {
      if(data[cycleKey]) {
        addCycleToIssue(workspaceSlug.toString(), projectId, data[cycleKey], issueId).catch(() => setToast(errorToastProps));
      } else {
        removeCycleFromIssue(workspaceSlug.toString(), projectId, issueId).catch(() => setToast(errorToastProps))
      }
      delete data[cycleKey];
    }

    if (isModuleChanged && workspaceSlug && issueUpdates[moduleKey]) {
      changeModulesInIssue(
        workspaceSlug.toString(),
        projectId,
        issueId,
        issueUpdates[moduleKey].ADD,
        issueUpdates[moduleKey].REMOVE
      ).catch(() => setToast(errorToastProps));
      delete data[moduleKey];
    }

    updateIssue && updateIssue(projectId, issueId, data).catch(() => setToast(errorToastProps));
  };

  const handleOnDrop = async (source: GroupDropLocation, destination: GroupDropLocation) => {
    if (
      source.columnId &&
      destination.columnId &&
      destination.columnId === source.columnId &&
      destination.id === source.id
    )
      return;

    await handleGroupDragDrop(
      source,
      destination,
      getIssueById,
      issues.getIssueIds,
      updateIssueOnDrop,
      group_by,
      sub_group_by,
      orderBy !== "sort_order"
    ).catch((err) => {
      setToast({
        title: "Error!",
        type: TOAST_TYPE.ERROR,
        message: err?.detail ?? "Failed to perform this action",
      });
    });
  };

  const renderQuickActions: TRenderQuickActions = useCallback(
    ({ issue, parentRef, customActionButton }) => (
      <QuickActions
        parentRef={parentRef}
        customActionButton={customActionButton}
        issue={issue}
        handleDelete={async () => removeIssue(issue.project_id, issue.id)}
        handleUpdate={async (data) => updateIssue && updateIssue(issue.project_id, issue.id, data)}
        handleRemoveFromView={async () => removeIssueFromView && removeIssueFromView(issue.project_id, issue.id)}
        handleArchive={async () => archiveIssue && archiveIssue(issue.project_id, issue.id)}
        handleRestore={async () => restoreIssue && restoreIssue(issue.project_id, issue.id)}
        readOnly={!isEditingAllowed || isCompletedCycle}
      />
    ),
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [isEditingAllowed, isCompletedCycle, removeIssue, updateIssue, removeIssueFromView, archiveIssue, restoreIssue]
  );

  const handleDeleteIssue = async () => {
    const draggedIssue = getIssueById(draggedIssueId ?? "");

    if (!draggedIssueId || !draggedIssue) return;

    await removeIssue(draggedIssue.project_id, draggedIssueId).finally(() => {
      setDeleteIssueModal(false);
      setDraggedIssueId(undefined);
      captureIssueEvent({
        eventName: ISSUE_DELETED,
        payload: { id: draggedIssueId, state: "FAILED", element: "Kanban layout drag & drop" },
        path: router.asPath,
      });
    });
  };

  const handleKanbanFilters = (toggle: "group_by" | "sub_group_by", value: string) => {
    if (workspaceSlug && projectId) {
      let kanbanFilters = issuesFilter?.issueFilters?.kanbanFilters?.[toggle] || [];
      if (kanbanFilters.includes(value)) {
        kanbanFilters = kanbanFilters.filter((_value) => _value != value);
      } else {
        kanbanFilters.push(value);
      }
      updateFilters(projectId.toString(), EIssueFilterType.KANBAN_FILTERS, {
        [toggle]: kanbanFilters,
      });
    }
  };

  const kanbanFilters = issuesFilter?.issueFilters?.kanbanFilters || { group_by: [], sub_group_by: [] };

  return (
    <>
      <DeleteIssueModal
        dataId={draggedIssueId}
        isOpen={deleteIssueModal}
        handleClose={() => setDeleteIssueModal(false)}
        onSubmit={handleDeleteIssue}
      />

      {showLoader && issues?.loader === "init-loader" && (
        <div className="fixed right-2 top-16 z-30 flex h-10 w-10 items-center justify-center rounded bg-custom-background-80 shadow-custom-shadow-sm">
          <Spinner className="h-5 w-5" />
        </div>
      )}

      <div
        className={`horizontal-scrollbar scrollbar-lg relative flex h-full w-full bg-custom-background-90 ${sub_group_by ? "vertical-scrollbar overflow-y-auto" : "overflow-x-auto overflow-y-hidden"}`}
        ref={scrollableContainerRef}
      >
        <div className="relative h-full w-max min-w-full bg-custom-background-90">
          {/* drag and delete component */}
          <div
            className={`fixed left-1/2 -translate-x-1/2 ${
              isDragging ? "z-40" : ""
            } top-3 mx-3 flex w-72 items-center justify-center`}
            ref={deleteAreaRef}
          >
            <div
              className={`${
                isDragging ? `opacity-100` : `opacity-0`
              } flex w-full items-center justify-center rounded border-2 border-red-500/20 bg-custom-background-100 px-3 py-5 text-xs font-medium italic text-red-500 ${
                isDragOverDelete ? "bg-red-500 opacity-70 blur-2xl" : ""
              } transition duration-300`}
            >
              Drop here to delete the issue.
            </div>
          </div>

          <div className="h-full w-max">
            <KanBanView
              issuesMap={issueMap}
              issueIds={issueIds}
              displayProperties={displayProperties}
              sub_group_by={sub_group_by}
              group_by={group_by}
              orderBy={orderBy}
              updateIssue={updateIssue}
              quickActions={renderQuickActions}
              handleKanbanFilters={handleKanbanFilters}
              kanbanFilters={kanbanFilters}
              enableQuickIssueCreate={enableQuickAdd}
              showEmptyGroup={userDisplayFilters?.show_empty_groups ?? true}
              quickAddCallback={issues?.quickAddIssue}
              viewId={viewId}
              disableIssueCreation={!enableIssueCreation || !isEditingAllowed || isCompletedCycle}
              canEditProperties={canEditProperties}
              storeType={storeType}
              addIssuesToView={addIssuesToView}
              scrollableContainerRef={scrollableContainerRef}
              handleOnDrop={handleOnDrop}
            />
          </div>
        </div>
      </div>
    </>
  );
});