import { css } from '@emotion/css';
import React, { memo, useEffect, useMemo } from 'react';
import AutoSizer from 'react-virtualized-auto-sizer';

import { GrafanaTheme2 } from '@grafana/data';
import { FilterInput, useStyles2 } from '@grafana/ui';
import { Page } from 'app/core/components/Page/Page';
import { GrafanaRouteComponentProps } from 'app/core/navigation/types';
import { useDispatch } from 'app/types';

import { buildNavModel, getDashboardsTabID } from '../folders/state/navModel';
import { useSearchStateManager } from '../search/state/SearchStateManager';
import { getSearchPlaceholder } from '../search/tempI18nPhrases';

import { skipToken, useGetFolderQuery, useSaveFolderMutation } from './api/browseDashboardsAPI';
import { BrowseActions } from './components/BrowseActions/BrowseActions';
import { BrowseFilters } from './components/BrowseFilters';
import { BrowseView } from './components/BrowseView';
import CreateNewButton from './components/CreateNewButton';
import { FolderActionsButton } from './components/FolderActionsButton';
import { SearchView } from './components/SearchView';
import { getFolderPermissions } from './permissions';
import { setAllSelection, useHasSelection } from './state';

export interface BrowseDashboardsPageRouteParams {
  uid?: string;
  slug?: string;
}

export interface Props extends GrafanaRouteComponentProps<BrowseDashboardsPageRouteParams> {}

// New Browse/Manage/Search Dashboards views for nested folders

const BrowseDashboardsPage = memo(({ match }: Props) => {
  const { uid: folderUID } = match.params;
  const dispatch = useDispatch();

  const styles = useStyles2(getStyles);
  const [searchState, stateManager] = useSearchStateManager();
  const isSearching = stateManager.hasSearchFilters();

  useEffect(() => {
    stateManager.initStateFromUrl(folderUID);

    // Clear selected state when folderUID changes
    dispatch(
      setAllSelection({
        isSelected: false,
        folderUID: undefined,
      })
    );
  }, [dispatch, folderUID, stateManager]);

  useEffect(() => {
    // Clear the search results when we leave SearchView to prevent old results flashing
    // when starting a new search
    if (!isSearching && searchState.result) {
      stateManager.setState({ result: undefined, includePanels: undefined });
    }
  }, [isSearching, searchState.result, stateManager]);

  const { data: folderDTO } = useGetFolderQuery(folderUID ?? skipToken);
  const [saveFolder] = useSaveFolderMutation();
  const navModel = useMemo(() => {
    if (!folderDTO) {
      return undefined;
    }
    const model = buildNavModel(folderDTO);

    // Set the "Dashboards" tab to active
    const dashboardsTabID = getDashboardsTabID(folderDTO.uid);
    const dashboardsTab = model.children?.find((child) => child.id === dashboardsTabID);
    if (dashboardsTab) {
      dashboardsTab.active = true;
    }
    return model;
  }, [folderDTO]);

  const hasSelection = useHasSelection();

  const { canEditInFolder, canCreateDashboards, canCreateFolder } = getFolderPermissions(folderDTO);

  const onEditTitle = folderUID
    ? async (newValue: string) => {
        if (folderDTO) {
          const result = await saveFolder({
            ...folderDTO,
            title: newValue,
          });
          if ('error' in result) {
            throw result.error;
          }
        }
      }
    : undefined;

  return (
    <Page
      navId="dashboards/browse"
      pageNav={navModel}
      onEditTitle={onEditTitle}
      actions={
        <>
          {folderDTO && <FolderActionsButton folder={folderDTO} />}
          {(canCreateDashboards || canCreateFolder) && (
            <CreateNewButton
              parentFolder={folderDTO}
              canCreateDashboard={canCreateDashboards}
              canCreateFolder={canCreateFolder}
            />
          )}
        </>
      }
    >
      <Page.Contents className={styles.pageContents}>
        <FilterInput
          placeholder={getSearchPlaceholder(searchState.includePanels)}
          value={searchState.query}
          escapeRegex={false}
          onChange={(e) => stateManager.onQueryChange(e)}
        />

        {hasSelection ? <BrowseActions /> : <BrowseFilters />}

        <div className={styles.subView}>
          <AutoSizer>
            {({ width, height }) =>
              isSearching ? (
                <SearchView canSelect={canEditInFolder} width={width} height={height} />
              ) : (
                <BrowseView canSelect={canEditInFolder} width={width} height={height} folderUID={folderUID} />
              )
            }
          </AutoSizer>
        </div>
      </Page.Contents>
    </Page>
  );
});

const getStyles = (theme: GrafanaTheme2) => ({
  pageContents: css({
    display: 'grid',
    gridTemplateRows: 'auto auto 1fr',
    height: '100%',
    rowGap: theme.spacing(1),
  }),

  // AutoSizer needs an element to measure the full height available
  subView: css({
    height: '100%',
  }),
});

BrowseDashboardsPage.displayName = 'BrowseDashboardsPage';
export default BrowseDashboardsPage;