# Source code for searx.engines.archlinux

    # SPDX-License-Identifier: AGPL-3.0-or-later
    """
    Arch Linux Wiki
    ~~~~~~~~~~~~~~~

    This implementation does not use a official API: Mediawiki provides API, but
    Arch Wiki blocks access to it.

    """

    from typing import TYPE_CHECKING
    from urllib.parse import urlencode, urljoin, urlparse
    import lxml
    import babel

    from searx.utils import extract_text, eval_xpath_list, eval_xpath_getindex
    from searx.enginelib.traits import EngineTraits
    from searx.locales import language_tag

    if TYPE_CHECKING:
        import logging

        logger: logging.Logger

    traits: EngineTraits

    about = {
        "website": 'https://wiki.archlinux.org/',
        "wikidata_id": 'Q101445877',
        "official_api_documentation": None,
        "use_official_api": False,
        "require_api_key": False,
        "results": 'HTML',
    }

    # engine dependent config
    categories = ['it', 'software wikis']
    paging = True
    main_wiki = 'wiki.archlinux.org'

    def request(query, params):

        sxng_lang = params['searxng_locale'].split('-')[0]
        netloc: str = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)  # type: ignore
        title: str = traits.custom['title'].get(sxng_lang, 'Special:Search')  # type: ignore
        base_url = 'https://' + netloc + '/index.php?'
        offset = (params['pageno'] - 1) * 20

        if netloc == main_wiki:
            eng_lang: str = traits.get_language(sxng_lang, 'English')  # type: ignore
            query += ' (' + eng_lang + ')'
        elif netloc == 'wiki.archlinuxcn.org':
            base_url = 'https://' + netloc + '/wzh/index.php?'

        args = {
            'search': query,
            'title': title,
            'limit': 20,
            'offset': offset,
            'profile': 'default',
        }

        params['url'] = base_url + urlencode(args)
        return params

    def response(resp):

        results = []
        dom = lxml.html.fromstring(resp.text)  # type: ignore

        # get the base URL for the language in which request was made
        sxng_lang = resp.search_params['searxng_locale'].split('-')[0]
        netloc: str = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)  # type: ignore
        base_url = 'https://' + netloc + '/index.php?'

        for result in eval_xpath_list(dom, '//ul[@class="mw-search-results"]/li'):
            link = eval_xpath_getindex(result, './/div[@class="mw-search-result-heading"]/a', 0)
            content = extract_text(result.xpath('.//div[@class="searchresult"]'))
            results.append(
                {
                    'url': urljoin(base_url, link.get('href')),  # type: ignore
                    'title': extract_text(link),
                    'content': content,
                }
            )

        return results

    def fetch_traits(engine_traits: EngineTraits):
        """Fetch languages from Archlinux-Wiki.  The location of the Wiki address of a
        language is mapped in a :py:obj:`custom field
        <searx.enginelib.traits.EngineTraits.custom>` (``wiki_netloc``).  Depending
        on the location, the ``title`` argument in the request is translated.

        .. code:: python

           "custom": {
             "wiki_netloc": {
               "de": "wiki.archlinux.de",
                # ...
               "zh": "wiki.archlinuxcn.org"
             }
             "title": {
               "de": "Spezial:Suche",
                # ...
               "zh": "Special:\u641c\u7d22"
             },
           },

        """
        # pylint: disable=import-outside-toplevel
        from searx.network import get  # see https://github.com/searxng/searxng/issues/762

        engine_traits.custom['wiki_netloc'] = {}
        engine_traits.custom['title'] = {}

        title_map = {
            'de': 'Spezial:Suche',
            'fa': 'ویژه:جستجو',
            'ja': '特別:検索',
            'zh': 'Special:搜索',
        }

        resp = get('https://wiki.archlinux.org/')
        if not resp.ok:  # type: ignore
            print("ERROR: response from wiki.archlinux.org is not OK.")

        dom = lxml.html.fromstring(resp.text)  # type: ignore
        for a in eval_xpath_list(dom, "//a[@class='interlanguage-link-target']"):

            sxng_tag = language_tag(babel.Locale.parse(a.get('lang'), sep='-'))
            # zh_Hans --> zh
            sxng_tag = sxng_tag.split('_')[0]

            netloc = urlparse(a.get('href')).netloc
            if netloc != 'wiki.archlinux.org':
                title = title_map.get(sxng_tag)
                if not title:
                    print("ERROR: title tag from %s (%s) is unknown" % (netloc, sxng_tag))
                    continue
                engine_traits.custom['wiki_netloc'][sxng_tag] = netloc
                engine_traits.custom['title'][sxng_tag] = title  # type: ignore

            eng_tag = extract_text(eval_xpath_list(a, ".//span"))
            engine_traits.languages[sxng_tag] = eng_tag  # type: ignore

        engine_traits.languages['en'] = 'English'