/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/* eslint-disable jsx-a11y/no-autofocus */

import React, {useEffect, useReducer, useRef, useState} from 'react';
import clsx from 'clsx';

import algoliaSearchHelper from 'algoliasearch-helper';
import algoliaSearch from 'algoliasearch/lite';

import ExecutionEnvironment from '@docusaurus/ExecutionEnvironment';
import Head from '@docusaurus/Head';
import Link from '@docusaurus/Link';
import {useAllDocsData} from '@docusaurus/plugin-content-docs/client';
import {
  HtmlClassNameProvider,
  useEvent,
  usePluralForm,
} from '@docusaurus/theme-common';
import {
  useSearchPage,
  useTitleFormatter,
} from '@docusaurus/theme-common/internal';
import Translate, {translate} from '@docusaurus/Translate';
import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
import {
  useAlgoliaThemeConfig,
  useSearchResultUrlProcessor,
} from '@docusaurus/theme-search-algolia/client';
import Layout from '@theme/Layout';

import styles from './styles.module.css';

// Very simple pluralization: probably good enough for now
function useDocumentsFoundPlural() {
  const {selectMessage} = usePluralForm();
  return (count: number) =>
    selectMessage(
      count,
      translate(
        {
          id: 'theme.SearchPage.documentsFound.plurals',
          description:
            'Pluralized label for "{count} documents found". Use as much plural forms (separated by "|") as your language support (see https://www.unicode.org/cldr/cldr-aux/charts/34/supplemental/language_plural_rules.html)',
          message: 'One document found|{count} documents found',
        },
        {count},
      ),
    );
}

function useDocsSearchVersionsHelpers() {
  const allDocsData = useAllDocsData();

  // State of the version select menus / algolia facet filters
  // docsPluginId -> versionName map
  const [searchVersions, setSearchVersions] = useState<{
    [pluginId: string]: string;
  }>(() =>
    Object.entries(allDocsData).reduce(
      (acc, [pluginId, pluginData]) => ({
        ...acc,
        [pluginId]: pluginData.versions[0]!.name,
      }),
      {},
    ),
  );

  // Set the value of a single select menu
  const setSearchVersion = (pluginId: string, searchVersion: string) =>
    setSearchVersions((s) => ({...s, [pluginId]: searchVersion}));

  const versioningEnabled = Object.values(allDocsData).some(
    (docsData) => docsData.versions.length > 1,
  );

  return {
    allDocsData,
    versioningEnabled,
    searchVersions,
    setSearchVersion,
  };
}

// We want to display one select per versioned docs plugin instance
function SearchVersionSelectList({
  docsSearchVersionsHelpers,
}: {
  docsSearchVersionsHelpers: ReturnType<typeof useDocsSearchVersionsHelpers>;
}) {
  const versionedPluginEntries = Object.entries(
    docsSearchVersionsHelpers.allDocsData,
  )
    // Do not show a version select for unversioned docs plugin instances
    .filter(([, docsData]) => docsData.versions.length > 1);

  return (
    <div
      className={clsx(
        'col',
        'col--3',
        'padding-left--none',
        styles.searchVersionColumn,
      )}>
      {versionedPluginEntries.map(([pluginId, docsData]) => {
        const labelPrefix =
          versionedPluginEntries.length > 1 ? `${pluginId}: ` : '';
        return (
          <select
            key={pluginId}
            onChange={(e) =>
              docsSearchVersionsHelpers.setSearchVersion(
                pluginId,
                e.target.value,
              )
            }
            defaultValue={docsSearchVersionsHelpers.searchVersions[pluginId]}
            className={styles.searchVersionInput}>
            {docsData.versions.map((version, i) => (
              <option
                key={i}
                label={`${labelPrefix}${version.label}`}
                value={version.name}
              />
            ))}
          </select>
        );
      })}
    </div>
  );
}

type ResultDispatcherState = {
  items: {
    title: string;
    url: string;
    summary: string;
    breadcrumbs: string[];
  }[];
  query: string | null;
  totalResults: number | null;
  totalPages: number | null;
  lastPage: number | null;
  hasMore: boolean | null;
  loading: boolean | null;
};

type ResultDispatcher =
  | {type: 'reset'; value?: undefined}
  | {type: 'loading'; value?: undefined}
  | {type: 'update'; value: ResultDispatcherState}
  | {type: 'advance'; value?: undefined};

function SearchPageContent(): JSX.Element {
  const {
    i18n: {currentLocale},
  } = useDocusaurusContext();
  const {
    algolia: {appId, apiKey, indexName},
  } = useAlgoliaThemeConfig();
  const processSearchResultUrl = useSearchResultUrlProcessor();
  const documentsFoundPlural = useDocumentsFoundPlural();

  const docsSearchVersionsHelpers = useDocsSearchVersionsHelpers();
  const {searchQuery, setSearchQuery} = useSearchPage();
  const initialSearchResultState: ResultDispatcherState = {
    items: [],
    query: null,
    totalResults: null,
    totalPages: null,
    lastPage: null,
    hasMore: null,
    loading: null,
  };
  const [searchResultState, searchResultStateDispatcher] = useReducer(
    (prevState: ResultDispatcherState, data: ResultDispatcher) => {
      switch (data.type) {
        case 'reset': {
          return initialSearchResultState;
        }
        case 'loading': {
          return {...prevState, loading: true};
        }
        case 'update': {
          if (searchQuery !== data.value.query) {
            return prevState;
          }

          return {
            ...data.value,
            items:
              data.value.lastPage === 0
                ? data.value.items
                : prevState.items.concat(data.value.items),
          };
        }
        case 'advance': {
          const hasMore = prevState.totalPages! > prevState.lastPage! + 1;

          return {
            ...prevState,
            lastPage: hasMore ? prevState.lastPage! + 1 : prevState.lastPage,
            hasMore,
          };
        }
        default:
          return prevState;
      }
    },
    initialSearchResultState,
  );

  const algoliaClient = algoliaSearch(appId, apiKey);
  const algoliaHelper = algoliaSearchHelper(algoliaClient, indexName, {
    hitsPerPage: 15,
    advancedSyntax: true,
    disjunctiveFacets: ['language', 'docusaurus_tag'],
  });

  algoliaHelper.on(
    'result',
    ({results: {query, hits, page, nbHits, nbPages}}) => {
      if (query === '' || !Array.isArray(hits)) {
        searchResultStateDispatcher({type: 'reset'});
        return;
      }

      const sanitizeValue = (value: string) =>
        value.replace(
          /algolia-docsearch-suggestion--highlight/g,
          'search-result-match',
        );

      const items = hits.map(
        ({
          url,
          _highlightResult: {hierarchy},
          _snippetResult: snippet = {},
        }: {
          url: string;
          _highlightResult: {hierarchy: {[key: string]: {value: string}}};
          _snippetResult: {content?: {value: string}};
        }) => {
          const titles = Object.keys(hierarchy).map((key) =>
            sanitizeValue(hierarchy[key]!.value),
          );
          return {
            title: titles.pop()!,
            url: processSearchResultUrl(url),
            summary: snippet.content
              ? `${sanitizeValue(snippet.content.value)}...`
              : '',
            breadcrumbs: titles,
          };
        },
      );

      searchResultStateDispatcher({
        type: 'update',
        value: {
          items,
          query,
          totalResults: nbHits,
          totalPages: nbPages,
          lastPage: page,
          hasMore: nbPages > page + 1,
          loading: false,
        },
      });
    },
  );

  const [loaderRef, setLoaderRef] = useState<HTMLDivElement | null>(null);
  const prevY = useRef(0);
  const observer = useRef(
    ExecutionEnvironment.canUseIntersectionObserver &&
      new IntersectionObserver(
        (entries) => {
          const {
            isIntersecting,
            boundingClientRect: {y: currentY},
          } = entries[0]!;

          if (isIntersecting && prevY.current > currentY) {
            searchResultStateDispatcher({type: 'advance'});
          }

          prevY.current = currentY;
        },
        {threshold: 1},
      ),
  );

  const getTitle = () =>
    searchQuery
      ? translate(
          {
            id: 'theme.SearchPage.existingResultsTitle',
            message: 'Search results for "{query}"',
            description: 'The search page title for non-empty query',
          },
          {
            query: searchQuery,
          },
        )
      : translate({
          id: 'theme.SearchPage.emptyResultsTitle',
          message: 'Search the documentation',
          description: 'The search page title for empty query',
        });

  const makeSearch = useEvent((page: number = 0) => {
    algoliaHelper.addDisjunctiveFacetRefinement('docusaurus_tag', 'default');
    algoliaHelper.addDisjunctiveFacetRefinement('language', currentLocale);

    Object.entries(docsSearchVersionsHelpers.searchVersions).forEach(
      ([pluginId, searchVersion]) => {
        algoliaHelper.addDisjunctiveFacetRefinement(
          'docusaurus_tag',
          `docs-${pluginId}-${searchVersion}`,
        );
      },
    );

    algoliaHelper.setQuery(searchQuery).setPage(page).search();
  });

  useEffect(() => {
    if (!loaderRef) {
      return undefined;
    }
    const currentObserver = observer.current;
    if (currentObserver) {
      currentObserver.observe(loaderRef);
      return () => currentObserver.unobserve(loaderRef);
    }
    return () => true;
  }, [loaderRef]);

  useEffect(() => {
    searchResultStateDispatcher({type: 'reset'});

    if (searchQuery) {
      searchResultStateDispatcher({type: 'loading'});

      setTimeout(() => {
        makeSearch();
      }, 300);
    }
  }, [searchQuery, docsSearchVersionsHelpers.searchVersions, makeSearch]);

  useEffect(() => {
    if (!searchResultState.lastPage || searchResultState.lastPage === 0) {
      return;
    }

    makeSearch(searchResultState.lastPage);
  }, [makeSearch, searchResultState.lastPage]);

  return (
    <Layout>
      <Head>
        <title>{useTitleFormatter(getTitle())}</title>
        {/*
         We should not index search pages
          See https://github.com/facebook/docusaurus/pull/3233
        */}
        <meta property="robots" content="noindex, follow" />
      </Head>

      <div className="container margin-vert--lg">
        <h1>{getTitle()}</h1>

        <form className="row" onSubmit={(e) => e.preventDefault()}>
          <div
            className={clsx('col', styles.searchQueryColumn, {
              'col--9': docsSearchVersionsHelpers.versioningEnabled,
              'col--12': !docsSearchVersionsHelpers.versioningEnabled,
            })}>
            <input
              type="search"
              name="q"
              className={styles.searchQueryInput}
              placeholder={translate({
                id: 'theme.SearchPage.inputPlaceholder',
                message: 'Type your search here',
                description: 'The placeholder for search page input',
              })}
              aria-label={translate({
                id: 'theme.SearchPage.inputLabel',
                message: 'Search',
                description: 'The ARIA label for search page input',
              })}
              onChange={(e) => setSearchQuery(e.target.value)}
              value={searchQuery}
              autoComplete="off"
              autoFocus
            />
          </div>

          {docsSearchVersionsHelpers.versioningEnabled && (
            <SearchVersionSelectList
              docsSearchVersionsHelpers={docsSearchVersionsHelpers}
            />
          )}
        </form>

        <div className="row">
          <div className={clsx('col', 'col--8', styles.searchResultsColumn)}>
            {!!searchResultState.totalResults &&
              documentsFoundPlural(searchResultState.totalResults)}
          </div>

          <div
            className={clsx(
              'col',
              'col--4',
              'text--right',
              styles.searchLogoColumn,
            )}>
            <a
              target="_blank"
              rel="noopener noreferrer"
              href="https://www.algolia.com/"
              aria-label={translate({
                id: 'theme.SearchPage.algoliaLabel',
                message: 'Search by Algolia',
                description: 'The ARIA label for Algolia mention',
              })}>
              <svg viewBox="0 0 168 24" className={styles.algoliaLogo}>
                <g fill="none">
                  <path
                    className={styles.algoliaLogoPathFill}
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                  />
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                  <path
                    fill="white"
                    d="M89.632 5.967v-.772a.978.978 0 0 0-.978-.977h-2.28a.978.978 0 0 0-.978.977v.793c0 .088.082.15.171.13a7.127 7.127 0 0 1 1.984-.28c.65 0 1.295.088 1.917.259.082.02.164-.04.164-.13m-6.248 1.01l-.39-.389a.977.977 0 0 0-1.382 0l-.465.465a.973.973 0 0 0 0 1.38l.383.383c.062.061.15.047.205-.014.226-.307.472-.601.746-.874.281-.28.568-.526.883-.751.068-.042.075-.137.02-.2m4.16 2.453v3.341c0 .096.104.165.192.117l2.97-1.537c.068-.034.089-.117.055-.184a3.695 3.695 0 0 0-3.08-1.866c-.068 0-.136.054-.136.13m0 8.048a4.489 4.489 0 0 1-4.49-4.482 4.488 4.488 0 0 1 4.49-4.482 4.488 4.488 0 0 1 4.489 4.482 4.484 4.484 0 0 1-4.49 4.482m0-10.85a6.363 6.363 0 1 0 0 12.729 6.37 6.37 0 0 0 6.372-6.368 6.358 6.358 0 0 0-6.371-6.36"
                  />
                </g>
              </svg>
            </a>
          </div>
        </div>

        {searchResultState.items.length > 0 ? (
          <main>
            {searchResultState.items.map(
              ({title, url, summary, breadcrumbs}, i) => (
                <article key={i} className={styles.searchResultItem}>
                  <h2 className={styles.searchResultItemHeading}>
                    <Link to={url} dangerouslySetInnerHTML={{__html: title}} />
                  </h2>

                  {breadcrumbs.length > 0 && (
                    <nav aria-label="breadcrumbs">
                      <ul
                        className={clsx(
                          'breadcrumbs',
                          styles.searchResultItemPath,
                        )}>
                        {breadcrumbs.map((html, index) => (
                          <li
                            key={index}
                            className="breadcrumbs__item"
                            // Developer provided the HTML, so assume it's safe.
                            // eslint-disable-next-line react/no-danger
                            dangerouslySetInnerHTML={{__html: html}}
                          />
                        ))}
                      </ul>
                    </nav>
                  )}

                  {summary && (
                    <p
                      className={styles.searchResultItemSummary}
                      // Developer provided the HTML, so assume it's safe.
                      // eslint-disable-next-line react/no-danger
                      dangerouslySetInnerHTML={{__html: summary}}
                    />
                  )}
                </article>
              ),
            )}
          </main>
        ) : (
          [
            searchQuery && !searchResultState.loading && (
              <p key="no-results">
                <Translate
                  id="theme.SearchPage.noResultsText"
                  description="The paragraph for empty search result">
                  No results were found
                </Translate>
              </p>
            ),
            !!searchResultState.loading && (
              <div key="spinner" className={styles.loadingSpinner} />
            ),
          ]
        )}

        {searchResultState.hasMore && (
          <div className={styles.loader} ref={setLoaderRef}>
            <Translate
              id="theme.SearchPage.fetchingNewResults"
              description="The paragraph for fetching new search results">
              Fetching new results...
            </Translate>
          </div>
        )}
      </div>
    </Layout>
  );
}

export default function SearchPage(): JSX.Element {
  return (
    <HtmlClassNameProvider className="search-page-wrapper">
      <SearchPageContent />
    </HtmlClassNameProvider>
  );
}
