import { useCallback, useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { useRouter } from "next/router";
import { subject } from "@casl/ability";
import { faArrowDown, faArrowUp } from "@fortawesome/free-solid-svg-icons";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { twMerge } from "tailwind-merge";

import NavHeader from "@app/components/navigation/NavHeader";
import { createNotification } from "@app/components/notifications";
import { PermissionDeniedBanner } from "@app/components/permissions";
import { ContentLoader, Pagination } from "@app/components/v2";
import {
  ProjectPermissionActions,
  ProjectPermissionDynamicSecretActions,
  ProjectPermissionSub,
  useProjectPermission,
  useWorkspace
} from "@app/context";
import { useDebounce, usePagination, usePopUp } from "@app/hooks";
import {
  useGetImportedSecretsSingleEnv,
  useGetSecretApprovalPolicyOfABoard,
  useGetWorkspaceSnapshotList,
  useGetWsSnapshotCount,
  useGetWsTags
} from "@app/hooks/api";
import { useGetProjectSecretsDetails } from "@app/hooks/api/dashboard";
import { DashboardSecretsOrderBy } from "@app/hooks/api/dashboard/types";
import { OrderByDirection } from "@app/hooks/api/generic/types";
import { DynamicSecretListView } from "@app/views/SecretMainPage/components/DynamicSecretListView";
import { FolderListView } from "@app/views/SecretMainPage/components/FolderListView";
import { SecretImportListView } from "@app/views/SecretMainPage/components/SecretImportListView";
import { SecretTableResourceCount } from "@app/views/SecretOverviewPage/components/SecretTableResourceCount/SecretTableResourceCount";

import { SecretV2MigrationSection } from "../SecretOverviewPage/components/SecretV2MigrationSection";
import { ActionBar } from "./components/ActionBar";
import { CreateSecretForm } from "./components/CreateSecretForm";
import { PitDrawer } from "./components/PitDrawer";
import { SecretDropzone } from "./components/SecretDropzone";
import { SecretListView } from "./components/SecretListView";
import { SnapshotView } from "./components/SnapshotView";
import { StoreProvider } from "./SecretMainPage.store";
import { Filter, RowType } from "./SecretMainPage.types";

const LOADER_TEXT = [
  "Retrieving your encrypted secrets...",
  "Fetching folders...",
  "Getting secret import links..."
];

export const SecretMainPage = () => {
  const { t } = useTranslation();
  const { currentWorkspace, isLoading: isWorkspaceLoading } = useWorkspace();
  const router = useRouter();
  const { permission } = useProjectPermission();

  const [isVisible, setIsVisible] = useState(false);

  const {
    offset,
    limit,
    orderDirection,
    setOrderDirection,
    setPage,
    perPage,
    page,
    setPerPage,
    orderBy
  } = usePagination<DashboardSecretsOrderBy>(DashboardSecretsOrderBy.Name);

  const [snapshotId, setSnapshotId] = useState<string | null>(null);
  const isRollbackMode = Boolean(snapshotId);
  const { popUp, handlePopUpClose, handlePopUpToggle } = usePopUp(["snapshots"] as const);

  // env slug
  const environment = router.query.env as string;
  const workspaceId = currentWorkspace?.id || "";
  const projectSlug = currentWorkspace?.slug || "";
  const secretPath = (router.query.secretPath as string) || "/";
  const canReadSecret = permission.can(
    ProjectPermissionActions.Read,
    subject(ProjectPermissionSub.Secrets, {
      environment,
      secretPath,
      secretName: "*",
      secretTags: ["*"]
    })
  );

  const canReadSecretImports = permission.can(
    ProjectPermissionActions.Read,
    subject(ProjectPermissionSub.SecretImports, { environment, secretPath })
  );

  const canReadDynamicSecret = permission.can(
    ProjectPermissionDynamicSecretActions.Lease,
    subject(ProjectPermissionSub.DynamicSecrets, { environment, secretPath })
  );

  const canDoReadRollback = permission.can(
    ProjectPermissionActions.Read,
    ProjectPermissionSub.SecretRollback
  );

  const defaultFilterState = {
    tags: {},
    searchFilter: (router.query.searchFilter as string) || "",
    include: {
      [RowType.Folder]: true,
      [RowType.Import]: canReadSecretImports,
      [RowType.DynamicSecret]: canReadDynamicSecret,
      [RowType.Secret]: canReadSecret
    }
  };

  const [filter, setFilter] = useState<Filter>(defaultFilterState);
  const [debouncedSearchFilter, setDebouncedSearchFilter] = useDebounce(filter.searchFilter);
  const [filterHistory, setFilterHistory] = useState<Map<string, Filter>>(new Map());

  // change filters if permissions change at different paths/env
  useEffect(() => {
    setFilter((prev) => ({
      ...prev,
      include: {
        [RowType.Folder]: true,
        [RowType.Import]: canReadSecretImports,
        [RowType.DynamicSecret]: canReadDynamicSecret,
        [RowType.Secret]: canReadSecret
      }
    }));
  }, [canReadSecret, canReadSecretImports, canReadDynamicSecret]);

  useEffect(() => {
    if (
      !isWorkspaceLoading &&
      !currentWorkspace?.environments.find((env) => env.slug === environment) &&
      router.isReady
    ) {
      router.push(`/project/${workspaceId}/secrets/overview`);
      createNotification({
        text: "No environment found with given slug",
        type: "error"
      });
    }
  }, [isWorkspaceLoading, currentWorkspace, environment, router.isReady]);

  const {
    data,
    isLoading: isDetailsLoading,
    isFetching: isDetailsFetching
  } = useGetProjectSecretsDetails({
    environment,
    projectId: workspaceId,
    secretPath,
    offset,
    limit,
    orderBy,
    search: debouncedSearchFilter,
    orderDirection,
    includeImports: canReadSecretImports && filter.include.import,
    includeFolders: filter.include.folder,
    includeDynamicSecrets: canReadDynamicSecret && filter.include.dynamic,
    includeSecrets: canReadSecret && filter.include.secret,
    tags: filter.tags
  });

  const {
    imports,
    folders,
    dynamicSecrets,
    secrets,
    totalImportCount = 0,
    totalFolderCount = 0,
    totalDynamicSecretCount = 0,
    totalSecretCount = 0,
    totalCount = 0
  } = data ?? {};

  useEffect(() => {
    // reset page if no longer valid
    if (totalCount <= offset) setPage(1);
  }, [totalCount]);

  // fetch imported secrets to show user the overriden ones
  const { data: importedSecrets } = useGetImportedSecretsSingleEnv({
    projectId: workspaceId,
    environment,
    path: secretPath,
    options: {
      enabled: canReadSecret
    }
  });

  // fetch tags
  const { data: tags } = useGetWsTags(canReadSecret ? workspaceId : "");

  const { data: boardPolicy } = useGetSecretApprovalPolicyOfABoard({
    workspaceId,
    environment,
    secretPath
  });
  const isProtectedBranch = Boolean(boardPolicy);

  const {
    data: snapshotList,
    isFetchingNextPage: isFetchingNextSnapshotList,
    fetchNextPage: fetchNextSnapshotList,
    hasNextPage: hasNextSnapshotListPage
  } = useGetWorkspaceSnapshotList({
    workspaceId,
    directory: secretPath,
    environment,
    isPaused: !popUp.snapshots.isOpen || !canDoReadRollback,
    limit: 10
  });

  const { data: snapshotCount, isLoading: isSnapshotCountLoading } = useGetWsSnapshotCount({
    workspaceId,
    environment,
    directory: secretPath,
    isPaused: !canDoReadRollback
  });

  const isNotEmpty = Boolean(
    secrets?.length || folders?.length || imports?.length || dynamicSecrets?.length
  );

  const handleSortToggle = () =>
    setOrderDirection((state) =>
      state === OrderByDirection.ASC ? OrderByDirection.DESC : OrderByDirection.ASC
    );

  const handleEnvChange = (slug: string) => {
    const query: Record<string, string> = { ...router.query, env: slug };
    delete query.secretPath;
    router.push({
      pathname: router.pathname,
      query
    });
  };

  const handleTagToggle = useCallback(
    (tagSlug: string) =>
      setFilter((state) => {
        const isTagPresent = Boolean(state.tags?.[tagSlug]);
        const newTagFilter = { ...state.tags };
        if (isTagPresent) delete newTagFilter[tagSlug];
        else newTagFilter[tagSlug] = true;
        return { ...state, tags: newTagFilter };
      }),
    []
  );

  const handleToggleRowType = useCallback(
    (rowType: RowType) =>
      setFilter((state) => {
        return {
          ...state,
          include: {
            ...state.include,
            [rowType]: !state.include[rowType]
          }
        };
      }),
    []
  );

  const handleSearchChange = useCallback(
    (searchFilter: string) => setFilter((state) => ({ ...state, searchFilter })),
    []
  );

  const handleToggleVisibility = useCallback(() => setIsVisible((state) => !state), []);

  // snapshot functions
  const handleSelectSnapshot = useCallback((snapId: string) => {
    setSnapshotId(snapId);
  }, []);

  const handleResetSnapshot = useCallback(() => {
    setSnapshotId(null);
    handlePopUpClose("snapshots");
  }, []);

  useEffect(() => {
    // restore filters for path if set
    const restore = filterHistory.get(secretPath);
    setFilter(restore ?? defaultFilterState);
    setDebouncedSearchFilter(restore?.searchFilter ?? "");
    const { searchFilter, ...query } = router.query;

    // this is a temp work around until we fully transition state to query params,
    // setting the initial search filter by query and then moving it to internal state
    if (router.query.searchFilter) {
      router.push({
        pathname: router.pathname,
        query
      });
    }
  }, [secretPath]);

  if (isDetailsLoading) {
    return <ContentLoader text={LOADER_TEXT} />;
  }

  const handleResetFilter = () => {
    // store for breadcrumb nav to restore previously used filters
    setFilterHistory((prev) => {
      const curr = new Map(prev);
      curr.set(secretPath, filter);
      return curr;
    });

    setFilter(defaultFilterState);
    setDebouncedSearchFilter("");
  };

  return (
    <StoreProvider>
      <div className="container mx-auto flex flex-col px-6 text-mineshaft-50 dark:[color-scheme:dark]">
        <SecretV2MigrationSection />
        <div className="relative right-6 -top-2 mb-2 ml-6">
          <NavHeader
            pageName={t("dashboard.title")}
            currentEnv={environment}
            userAvailableEnvs={currentWorkspace?.environments}
            isFolderMode
            secretPath={secretPath}
            isProjectRelated
            onEnvChange={handleEnvChange}
            isProtectedBranch={isProtectedBranch}
            protectionPolicyName={boardPolicy?.name}
          />
        </div>
        {!isRollbackMode ? (
          <>
            <ActionBar
              secrets={secrets}
              environment={environment}
              workspaceId={workspaceId}
              projectSlug={projectSlug}
              secretPath={secretPath}
              isVisible={isVisible}
              filter={filter}
              tags={tags}
              onVisibilityToggle={handleToggleVisibility}
              onSearchChange={handleSearchChange}
              onToggleTagFilter={handleTagToggle}
              snapshotCount={snapshotCount || 0}
              isSnapshotCountLoading={isSnapshotCountLoading}
              onToggleRowType={handleToggleRowType}
              onClickRollbackMode={() => handlePopUpToggle("snapshots", true)}
            />
            <div className="thin-scrollbar mt-3 overflow-y-auto overflow-x-hidden rounded-md rounded-b-none bg-mineshaft-800 text-left text-sm text-bunker-300">
              <div className="flex flex-col" id="dashboard">
                {isNotEmpty && (
                  <div
                    className={twMerge(
                      "sticky top-0 flex border-b border-mineshaft-600 bg-mineshaft-800 font-medium"
                    )}
                  >
                    <div style={{ width: "2.8rem" }} className="flex-shrink-0 px-4 py-3" />
                    <div
                      className="flex w-80 flex-shrink-0 items-center border-r border-mineshaft-600 px-4 py-2"
                      role="button"
                      tabIndex={0}
                      onClick={handleSortToggle}
                      onKeyDown={(evt) => {
                        if (evt.key === "Enter") handleSortToggle();
                      }}
                    >
                      Key
                      <FontAwesomeIcon
                        icon={orderDirection === OrderByDirection.ASC ? faArrowDown : faArrowUp}
                        className="ml-2"
                      />
                    </div>
                    <div className="flex-grow px-4 py-2">Value</div>
                  </div>
                )}
                {canReadSecretImports && Boolean(imports?.length) && (
                  <SecretImportListView
                    searchTerm={debouncedSearchFilter}
                    secretImports={imports}
                    isFetching={isDetailsFetching}
                    environment={environment}
                    workspaceId={workspaceId}
                    secretPath={secretPath}
                    importedSecrets={importedSecrets}
                  />
                )}
                {Boolean(folders?.length) && (
                  <FolderListView
                    folders={folders}
                    environment={environment}
                    workspaceId={workspaceId}
                    secretPath={secretPath}
                    onNavigateToFolder={handleResetFilter}
                  />
                )}
                {canReadDynamicSecret && Boolean(dynamicSecrets?.length) && (
                  <DynamicSecretListView
                    environment={environment}
                    projectSlug={projectSlug}
                    secretPath={secretPath}
                    dynamicSecrets={dynamicSecrets}
                  />
                )}
                {canReadSecret && Boolean(secrets?.length) && (
                  <SecretListView
                    secrets={secrets}
                    tags={tags}
                    isVisible={isVisible}
                    environment={environment}
                    workspaceId={workspaceId}
                    secretPath={secretPath}
                    isProtectedBranch={isProtectedBranch}
                  />
                )}
                {!canReadSecret &&
                  !canReadDynamicSecret &&
                  !canReadSecretImports &&
                  folders?.length === 0 && <PermissionDeniedBanner />}
              </div>
            </div>
            {!isDetailsLoading && totalCount > 0 && (
              <Pagination
                startAdornment={
                  <SecretTableResourceCount
                    dynamicSecretCount={totalDynamicSecretCount}
                    importCount={totalImportCount}
                    secretCount={totalSecretCount}
                    folderCount={totalFolderCount}
                  />
                }
                className="rounded-b-md border-t border-solid border-t-mineshaft-600"
                count={totalCount}
                page={page}
                perPage={perPage}
                onChangePage={(newPage) => setPage(newPage)}
                onChangePerPage={(newPerPage) => setPerPage(newPerPage)}
              />
            )}
            <CreateSecretForm
              environment={environment}
              workspaceId={workspaceId}
              secretPath={secretPath}
              autoCapitalize={currentWorkspace?.autoCapitalization}
              isProtectedBranch={isProtectedBranch}
            />
            <SecretDropzone
              secrets={secrets}
              environment={environment}
              workspaceId={workspaceId}
              secretPath={secretPath}
              isSmaller={isNotEmpty}
              environments={currentWorkspace?.environments}
              isProtectedBranch={isProtectedBranch}
            />
            <PitDrawer
              secretSnaphots={snapshotList}
              snapshotId={snapshotId}
              isDrawerOpen={popUp.snapshots.isOpen}
              onOpenChange={(isOpen) => handlePopUpToggle("snapshots", isOpen)}
              hasNextPage={hasNextSnapshotListPage}
              fetchNextPage={fetchNextSnapshotList}
              onSelectSnapshot={handleSelectSnapshot}
              isFetchingNextPage={isFetchingNextSnapshotList}
            />
          </>
        ) : (
          <SnapshotView
            snapshotId={snapshotId || ""}
            environment={environment}
            workspaceId={workspaceId}
            secretPath={secretPath}
            secrets={secrets}
            folders={folders}
            snapshotCount={snapshotCount}
            onGoBack={handleResetSnapshot}
            onClickListSnapshot={() => handlePopUpToggle("snapshots", true)}
          />
        )}
      </div>
    </StoreProvider>
  );
};