import React, { useEffect, useMemo, useState } from 'react';

import {
  Alert,
  Button,
  Pagination,
  Panel,
  PanelMain,
  SearchInput,
  Toolbar,
  ToolbarContent,
  ToolbarItem,
  ToggleGroup,
  ToggleGroupItem,
  PaginationVariant,
  Grid,
} from '@patternfly/react-core';
import { Modal } from '@patternfly/react-core/deprecated';
import { ExternalLinkAltIcon } from '@patternfly/react-icons';
import { Table, Tbody, Td, Th, Thead, Tr } from '@patternfly/react-table';

import { BulkSelect } from './components/BulkSelect';
import Empty from './components/Empty';
import { Error } from './components/Error';
import { Loading } from './components/Loading';
import UploadRepositoryLabel from './components/UploadRepositoryLabel';
import {
  convertSchemaToIBCustomRepo,
  convertSchemaToIBPayloadRepo,
} from './components/Utilities';
import RepositoriesStatus from './RepositoriesStatus';
import RepositoryUnavailable from './RepositoryUnavailable';

import {
  ContentOrigin,
  PAGINATION_COUNT,
  TEMPLATES_URL,
} from '../../../../constants';
import {
  ApiRepositoryResponseRead,
  useListRepositoriesQuery,
  useGetTemplateQuery,
  useListRepositoryParametersQuery,
} from '../../../../store/contentSourcesApi';
import { useAppDispatch, useAppSelector } from '../../../../store/hooks';
import {
  changeCustomRepositories,
  changePayloadRepositories,
  changeRedHatRepositories,
  selectArchitecture,
  selectCustomRepositories,
  selectDistribution,
  selectGroups,
  selectPackages,
  selectPayloadRepositories,
  selectRecommendedRepositories,
  selectTemplate,
  selectUseLatest,
  selectWizardMode,
} from '../../../../store/wizardSlice';
import { releaseToVersion } from '../../../../Utilities/releaseToVersion';
import useDebounce from '../../../../Utilities/useDebounce';

const Repositories = () => {
  const dispatch = useAppDispatch();
  const wizardMode = useAppSelector(selectWizardMode);
  const arch = useAppSelector(selectArchitecture);
  const distribution = useAppSelector(selectDistribution);
  const version = releaseToVersion(distribution);
  const customRepositories = useAppSelector(selectCustomRepositories);
  const packages = useAppSelector(selectPackages);
  const groups = useAppSelector(selectGroups);
  const useLatestContent = useAppSelector(selectUseLatest);

  const payloadRepositories = useAppSelector(selectPayloadRepositories);
  const recommendedRepos = useAppSelector(selectRecommendedRepositories);
  const templateUuid = useAppSelector(selectTemplate);

  const [modalOpen, setModalOpen] = useState(false);
  const [reposToRemove, setReposToRemove] = useState<string[]>([]);
  const [filterValue, setFilterValue] = useState('');
  const [perPage, setPerPage] = useState(10);
  const [page, setPage] = useState(1);
  const [toggleSelected, setToggleSelected] = useState<
    'toggle-group-all' | 'toggle-group-selected'
  >('toggle-group-all');
  const [isTemplateSelected, setIsTemplateSelected] = useState(false);

  const debouncedFilterValue = useDebounce(filterValue);

  const { data: repositoryParameters } = useListRepositoryParametersQuery();

  const getReadableArchitecture = (technicalArch: string | undefined) => {
    if (!technicalArch || !repositoryParameters?.distribution_arches) {
      return technicalArch || '-';
    }

    const archParam = repositoryParameters.distribution_arches.find(
      (arch) => arch.label === technicalArch
    );

    return archParam?.name || technicalArch;
  };

  const getReadableVersions = (technicalVersions: string[] | undefined) => {
    if (!technicalVersions || !repositoryParameters?.distribution_versions) {
      return technicalVersions || '-';
    }

    const readableVersions = technicalVersions.map((version) => {
      const versionParam = repositoryParameters.distribution_versions?.find(
        (v) => v.label === version
      );
      return versionParam?.name || version;
    });

    return readableVersions.join(', ');
  };

  const selected = useMemo(
    () =>
      new Set(
        [
          ...customRepositories.map(({ id }) => id).flat(1),
          ...payloadRepositories.map(({ id }) => id),
          ...recommendedRepos.map(({ uuid }) => uuid),
        ].filter((id) => !!id) as string[]
      ),
    [customRepositories, payloadRepositories, recommendedRepos]
  );

  // eslint-disable-next-line react-hooks/exhaustive-deps
  const initialSelectedState = useMemo(() => new Set([...selected]), []);

  const {
    data: { data: previousReposData = [] } = {},
    isLoading: previousLoading,
    isSuccess: previousSuccess,
    refetch: refetchIntial,
  } = useListRepositoriesQuery(
    {
      availableForArch: arch,
      availableForVersion: version,
      origin: ContentOrigin.CUSTOM,
      limit: 999, // O.O Oh dear, if possible this whole call should be removed
      offset: 0,
      uuid: [...initialSelectedState].join(','),
    },
    { refetchOnMountOrArgChange: false, skip: isTemplateSelected }
  );

  useEffect(() => {
    if (toggleSelected === 'toggle-group-selected' && !selected.size) {
      setToggleSelected('toggle-group-all');
    }
  }, [selected, toggleSelected]);

  useEffect(() => {
    setIsTemplateSelected(templateUuid !== '');
  }, [templateUuid]);

  const {
    data: { data: contentList = [], meta: { count } = { count: 0 } } = {},
    isError,
    isFetching,
    isLoading,
    refetch: refetchMain,
  } = useListRepositoriesQuery(
    {
      availableForArch: arch,
      availableForVersion: version,
      contentType: 'rpm',
      origin: ContentOrigin.CUSTOM,
      limit: perPage,
      offset: perPage * (page - 1),
      search: debouncedFilterValue,
      uuid:
        toggleSelected === 'toggle-group-selected'
          ? [...selected].join(',')
          : '',
    },
    { refetchOnMountOrArgChange: 60, skip: isTemplateSelected }
  );

  const refresh = () => {
    // In case the user deletes an intially selected repository.
    // Refetching will react to both added and removed repositories.
    refetchMain();
    refetchIntial();
  };

  const addSelected = (
    repo: ApiRepositoryResponseRead | ApiRepositoryResponseRead[]
  ) => {
    let reposToAdd: ApiRepositoryResponseRead[] = [];
    // Check if array of items
    if ((repo as ApiRepositoryResponseRead[])?.length) {
      reposToAdd = (repo as ApiRepositoryResponseRead[]).filter(
        (r) =>
          r.uuid &&
          !isRepoDisabled(r, selected.has(r.uuid))[0] &&
          !selected.has(r.uuid)
      );
    } else {
      // Then it should be a single item
      const singleRepo = repo as ApiRepositoryResponseRead;
      if (
        singleRepo?.uuid &&
        !isRepoDisabled(singleRepo, selected.has(singleRepo.uuid))[0] &&
        !selected.has(singleRepo.uuid)
      ) {
        reposToAdd.push(singleRepo);
      }
    }

    const customToAdd = reposToAdd.map((repo) =>
      convertSchemaToIBCustomRepo(repo!)
    );

    const payloadToAdd = reposToAdd.map((repo) =>
      convertSchemaToIBPayloadRepo(repo!)
    );

    dispatch(changeCustomRepositories([...customRepositories, ...customToAdd]));
    dispatch(
      changePayloadRepositories([...payloadRepositories, ...payloadToAdd])
    );
  };

  const clearSelected = () => {
    const recommendedReposSet = new Set(
      recommendedRepos.map(({ uuid }) => uuid)
    );
    const initiallySelected = [...selected].some(
      (uuid) => uuid && initialSelectedState.has(uuid)
    );

    if (initiallySelected) {
      setModalOpen(true);
      setReposToRemove([...selected]);
      return;
    }

    dispatch(
      changeCustomRepositories(
        customRepositories.filter(({ id }) => recommendedReposSet.has(id))
      )
    );
    dispatch(
      changePayloadRepositories(
        payloadRepositories.filter(({ id }) => recommendedReposSet.has(id))
      )
    );
  };

  const removeSelected = (
    repo: ApiRepositoryResponseRead | ApiRepositoryResponseRead[]
  ) => {
    if ((repo as ApiRepositoryResponseRead[])?.length) {
      const itemsToRemove = new Set(
        (repo as ApiRepositoryResponseRead[]).map(({ uuid }) => uuid)
      );

      dispatch(
        changeCustomRepositories(
          customRepositories.filter(({ id }) => !itemsToRemove.has(id))
        )
      );

      dispatch(
        changePayloadRepositories(
          payloadRepositories.filter(({ id }) => !itemsToRemove.has(id))
        )
      );

      return;
    }

    const uuidToRemove = (repo as ApiRepositoryResponseRead)?.uuid;
    if (uuidToRemove) {
      dispatch(
        changeCustomRepositories(
          customRepositories.filter(({ id }) => uuidToRemove !== id)
        )
      );
      dispatch(
        changePayloadRepositories(
          payloadRepositories.filter(({ id }) => uuidToRemove !== id)
        )
      );
    }
  };

  const handleAddRemove = (
    repo: ApiRepositoryResponseRead | ApiRepositoryResponseRead[],
    selected: boolean
  ) => {
    if (selected) return addSelected(repo);
    if ((repo as ApiRepositoryResponseRead[])?.length) {
      const initiallySelectedItems = (repo as ApiRepositoryResponseRead[]).map(
        ({ uuid }) => uuid
      );

      const hasSome = initiallySelectedItems.some(
        (uuid) => uuid && initialSelectedState.has(uuid)
      );

      if (hasSome) {
        setModalOpen(true);
        setReposToRemove(initiallySelectedItems as string[]);
        return;
      }
    } else {
      const isInitiallySelected =
        (repo as ApiRepositoryResponseRead).uuid &&
        initialSelectedState.has(
          (repo as ApiRepositoryResponseRead).uuid || ''
        );
      if (isInitiallySelected) {
        setModalOpen(true);
        setReposToRemove([(repo as ApiRepositoryResponseRead).uuid as string]);
        return;
      }
    }
    return removeSelected(repo);
  };

  const previousReposNowUnavailable: number = useMemo(() => {
    if (
      !previousLoading &&
      previousSuccess &&
      previousReposData.length !== initialSelectedState.size &&
      previousReposData.length < initialSelectedState.size
    ) {
      const prevSet = new Set(previousReposData.map(({ uuid }) => uuid));
      const itemsToRemove = [...initialSelectedState]
        .filter((uuid) => !prevSet.has(uuid))
        .map((uuid) => ({ uuid })) as ApiRepositoryResponseRead[];
      removeSelected(itemsToRemove);
      return initialSelectedState.size - previousReposData.length;
    }
    return 0;
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [
    previousLoading,
    previousSuccess,
    previousReposData,
    initialSelectedState,
  ]);

  const handleToggleClick = (
    toggleType: 'toggle-group-all' | 'toggle-group-selected'
  ) => {
    setPage(1);
    setToggleSelected(toggleType);
  };

  const isRepoDisabled = (
    repo: ApiRepositoryResponseRead,
    isSelected: boolean
  ): [boolean, string] => {
    if (isFetching) {
      return [true, 'Repository data is still fetching, please wait.'];
    }

    if (
      recommendedRepos.length > 0 &&
      repo.url?.includes('epel') &&
      isSelected &&
      (packages.length || groups.length)
    ) {
      return [
        true,
        'This repository was added because of previously recommended packages added to the image.\n' +
          'To remove the repository, its related packages must be removed first.',
      ];
    }

    if (repo.status !== 'Valid') {
      return [
        true,
        `Repository can't be selected. The status is still '${repo.status}'.`,
      ];
    }

    if (!repo.snapshot && !isSelected && !useLatestContent) {
      return [
        true,
        `This repository doesn't have snapshots enabled, so it cannot be selected.`,
      ];
    }

    return [false, '']; // Repository is enabled
  };

  const handlePerPageSelect = (
    _: React.MouseEvent,
    newPerPage: number,
    newPage: number
  ) => {
    setPerPage(newPerPage);
    setPage(newPage);
  };

  const handleFilterRepositories = (
    e: React.FormEvent<HTMLInputElement>,
    value: string
  ) => {
    e.preventDefault();
    setPage(1);
    setFilterValue(value);
  };

  const onClose = () => setModalOpen(false);

  const handleRemoveAnyway = () => {
    const itemsToRemove = new Set(reposToRemove);

    dispatch(
      changeCustomRepositories(
        customRepositories.filter(({ id }) => !itemsToRemove.has(id))
      )
    );

    dispatch(
      changePayloadRepositories(
        payloadRepositories.filter(({ id }) => !itemsToRemove.has(id || ''))
      )
    );

    setReposToRemove([]);
    onClose();
  };

  const {
    data: selectedTemplateData,
    isError: isTemplateError,
    isLoading: isTemplateLoading,
  } = useGetTemplateQuery(
    {
      uuid: templateUuid,
    },
    { refetchOnMountOrArgChange: true, skip: templateUuid === '' }
  );

  const {
    data: {
      data: reposInTemplate = [],
      meta: { count: reposInTemplateCount } = { count: 0 },
    } = {},
    isError: isReposInTemplateError,
    isLoading: isReposInTemplateLoading,
  } = useListRepositoriesQuery(
    {
      contentType: 'rpm',
      limit: perPage,
      offset: perPage * (page - 1),
      uuid:
        selectedTemplateData && selectedTemplateData.repository_uuids
          ? selectedTemplateData.repository_uuids?.join(',')
          : '',
    },
    { refetchOnMountOrArgChange: true, skip: !isTemplateSelected }
  );

  useEffect(() => {
    if (isTemplateSelected && reposInTemplate.length > 0) {
      const customReposInTemplate = reposInTemplate.filter(
        (repo) => repo.origin !== ContentOrigin.REDHAT
      );
      const redHatReposInTemplate = reposInTemplate.filter(
        (repo) => repo.origin === ContentOrigin.REDHAT
      );

      dispatch(
        changeCustomRepositories(
          customReposInTemplate.map((repo) =>
            convertSchemaToIBCustomRepo(repo!)
          )
        )
      );

      dispatch(
        changePayloadRepositories(
          customReposInTemplate.map((repo) =>
            convertSchemaToIBPayloadRepo(repo!)
          )
        )
      );

      dispatch(
        changeRedHatRepositories(
          redHatReposInTemplate.map((repo) =>
            convertSchemaToIBPayloadRepo(repo!)
          )
        )
      );
    }
  }, [templateUuid, reposInTemplate]);

  if (isError || isTemplateError || isReposInTemplateError) return <Error />;
  if (isLoading || isTemplateLoading || isReposInTemplateLoading)
    return <Loading />;
  if (!isTemplateSelected) {
    return (
      <Grid>
        <Modal
          titleIconVariant="warning"
          title="Are you sure?"
          isOpen={modalOpen}
          onClose={onClose}
          variant="small"
          actions={[
            <Button key="remove" variant="primary" onClick={handleRemoveAnyway}>
              Remove anyway
            </Button>,
            <Button key="back" variant="link" onClick={onClose}>
              Back
            </Button>,
          ]}
        >
          You are removing a previously added repository.
          <br />
          We do not recommend removing repositories if you have added packages
          from them.
        </Modal>
        {wizardMode === 'edit' && (
          <Alert
            title="Removing previously added repositories may lead to issues with selected packages"
            variant="warning"
            isPlain
            isInline
          />
        )}
        <Toolbar>
          <ToolbarContent>
            <ToolbarItem>
              <BulkSelect
                selected={selected}
                contentList={contentList}
                deselectAll={clearSelected}
                perPage={perPage}
                handleAddRemove={handleAddRemove}
                isDisabled={
                  isFetching ||
                  (!selected.size && !contentList.length) ||
                  contentList.every(
                    (repo) =>
                      repo.uuid &&
                      isRepoDisabled(repo, selected.has(repo.uuid))[0]
                  )
                }
              />
            </ToolbarItem>
            <ToolbarItem>
              <SearchInput
                placeholder="Filter repositories"
                aria-label="Filter repositories"
                onChange={handleFilterRepositories}
                value={filterValue}
                onClear={() => setFilterValue('')}
              />
            </ToolbarItem>
            <ToolbarItem>
              <Button
                variant="primary"
                isInline
                onClick={() => refresh()}
                isLoading={isFetching}
              >
                {isFetching ? 'Refreshing' : 'Refresh'}
              </Button>
            </ToolbarItem>
            <ToolbarItem>
              <ToggleGroup aria-label="Filter repositories list">
                <ToggleGroupItem
                  text="All"
                  aria-label="All repositories"
                  buttonId="toggle-group-all"
                  isSelected={toggleSelected === 'toggle-group-all'}
                  onChange={() => handleToggleClick('toggle-group-all')}
                />
                <ToggleGroupItem
                  text="Selected"
                  isDisabled={!selected.size}
                  aria-label="Selected repositories"
                  buttonId="toggle-group-selected"
                  isSelected={toggleSelected === 'toggle-group-selected'}
                  onChange={() => handleToggleClick('toggle-group-selected')}
                />
              </ToggleGroup>
            </ToolbarItem>
          </ToolbarContent>
        </Toolbar>
        <Panel>
          <PanelMain>
            {previousReposNowUnavailable ? (
              <RepositoryUnavailable quantity={previousReposNowUnavailable} />
            ) : (
              ''
            )}
            {contentList.length === 0 ? (
              <Empty
                hasFilterValue={!!debouncedFilterValue}
                refetch={refresh}
              />
            ) : (
              <Table variant="compact">
                <Thead>
                  <Tr>
                    <Th aria-label="Selected" />
                    <Th width={45}>Name</Th>
                    <Th width={15}>Architecture</Th>
                    <Th>Version</Th>
                    <Th width={10}>Packages</Th>
                    <Th>Status</Th>
                  </Tr>
                </Thead>
                <Tbody>
                  {contentList.map((repo, rowIndex) => {
                    const {
                      uuid = '',
                      url = '',
                      name,
                      status = '',
                      origin = '',
                      distribution_arch,
                      distribution_versions,
                      package_count,
                      last_introspection_time,
                      failed_introspections_count,
                    } = repo;

                    const [isDisabled, disabledReason] = isRepoDisabled(
                      repo,
                      selected.has(uuid)
                    );

                    return (
                      <Tr key={`${uuid}-${rowIndex}`}>
                        <Td
                          select={{
                            isSelected: selected.has(uuid),
                            rowIndex: rowIndex,
                            onSelect: (_, isSelecting) =>
                              handleAddRemove(repo, isSelecting),
                            isDisabled: isDisabled,
                          }}
                          title={disabledReason}
                        />
                        <Td dataLabel={'Name'}>
                          {name}
                          {origin === ContentOrigin.UPLOAD ? (
                            <UploadRepositoryLabel />
                          ) : (
                            <>
                              <br />
                              <Button
                                component="a"
                                target="_blank"
                                variant="link"
                                icon={<ExternalLinkAltIcon />}
                                iconPosition="right"
                                isInline
                                href={url}
                              >
                                {url}
                              </Button>
                            </>
                          )}
                        </Td>
                        <Td dataLabel={'Architecture'}>
                          {getReadableArchitecture(distribution_arch)}
                        </Td>
                        <Td dataLabel={'Version'}>
                          {getReadableVersions(distribution_versions)}
                        </Td>
                        <Td dataLabel={'Packages'}>{package_count || '-'}</Td>
                        <Td dataLabel={'Status'}>
                          <RepositoriesStatus
                            repoStatus={status || 'Unavailable'}
                            repoUrl={url}
                            repoIntrospections={last_introspection_time}
                            repoFailCount={failed_introspections_count}
                          />
                        </Td>
                      </Tr>
                    );
                  })}
                </Tbody>
              </Table>
            )}
          </PanelMain>
        </Panel>
        <Pagination
          itemCount={count ?? PAGINATION_COUNT}
          perPage={perPage}
          page={page}
          onSetPage={(_, newPage) => setPage(newPage)}
          onPerPageSelect={handlePerPageSelect}
          variant={PaginationVariant.bottom}
        />
      </Grid>
    );
  } else {
    return (
      <>
        <Alert
          variant="info"
          isInline
          title={
            <>
              The repositories seen below are from the selected content template
              and have been added automatically. If you do not want these
              repositories in your image, you can{' '}
              <Button
                component="a"
                target="_blank"
                variant="link"
                isInline
                icon={<ExternalLinkAltIcon />}
                href={`${TEMPLATES_URL}/${templateUuid}/edit`}
              >
                {' '}
                modify this content template
              </Button>{' '}
              or choose another snapshot option.
            </>
          }
        />
        <Grid>
          <Panel>
            <PanelMain>
              <Table variant="compact">
                <Thead>
                  <Tr>
                    <Th aria-label="Selected" />
                    <Th width={45}>Name</Th>
                    <Th width={15}>Architecture</Th>
                    <Th>Version</Th>
                    <Th width={10}>Packages</Th>
                    <Th>Status</Th>
                  </Tr>
                </Thead>
                <Tbody>
                  {reposInTemplate.map((repo, rowIndex) => {
                    const {
                      uuid = '',
                      url = '',
                      name,
                      status = '',
                      origin = '',
                      distribution_arch,
                      distribution_versions,
                      package_count,
                      last_introspection_time,
                      failed_introspections_count,
                    } = repo;

                    return (
                      <Tr key={`${uuid}-${rowIndex}`}>
                        <Td
                          select={{
                            isSelected: true,
                            rowIndex: rowIndex,
                            isDisabled: true,
                          }}
                        />
                        <Td dataLabel={'Name'}>
                          {name}
                          {origin === ContentOrigin.UPLOAD ? (
                            <UploadRepositoryLabel />
                          ) : (
                            <>
                              <br />
                              <Button
                                component="a"
                                target="_blank"
                                variant="link"
                                icon={<ExternalLinkAltIcon />}
                                iconPosition="right"
                                isInline
                                href={url}
                              >
                                {url}
                              </Button>
                            </>
                          )}
                        </Td>
                        <Td dataLabel={'Architecture'}>
                          {getReadableArchitecture(distribution_arch)}
                        </Td>
                        <Td dataLabel={'Version'}>
                          {getReadableVersions(distribution_versions)}
                        </Td>
                        <Td dataLabel={'Packages'}>{package_count || '-'}</Td>
                        <Td dataLabel={'Status'}>
                          <RepositoriesStatus
                            repoStatus={status || 'Unavailable'}
                            repoUrl={url}
                            repoIntrospections={last_introspection_time}
                            repoFailCount={failed_introspections_count}
                          />
                        </Td>
                      </Tr>
                    );
                  })}
                </Tbody>
              </Table>
            </PanelMain>
          </Panel>
          <Pagination
            itemCount={reposInTemplateCount ?? PAGINATION_COUNT}
            perPage={perPage}
            page={page}
            onSetPage={(_, newPage) => setPage(newPage)}
            onPerPageSelect={handlePerPageSelect}
            variant={PaginationVariant.bottom}
          />
        </Grid>
      </>
    );
  }
};

export default Repositories;