# Source code for searx.engines.brave

    # SPDX-License-Identifier: AGPL-3.0-or-later
    """Brave supports the categories listed in :py:obj:`brave_category` (General,
    news, videos, images).  The support of :py:obj:`paging` and :py:obj:`time range
    <time_range_support>` is limited (see remarks).

    Configured ``brave`` engines:

    .. code:: yaml

      - name: brave
        engine: brave
        ...
        brave_category: search
        time_range_support: true
        paging: true

      - name: brave.images
        engine: brave
        ...
        brave_category: images

      - name: brave.videos
        engine: brave
        ...
        brave_category: videos

      - name: brave.news
        engine: brave
        ...
        brave_category: news

      - name: brave.goggles
        brave_category: goggles
        time_range_support: true
        paging: true
        ...
        brave_category: goggles

    .. _brave regions:

    Brave regions
    =============

    Brave uses two-digit tags for the regions like ``ca`` while SearXNG deals with
    locales.  To get a mapping, all *officiat de-facto* languages of the Brave
    region are mapped to regions in SearXNG (see :py:obj:`babel
    <babel.languages.get_official_languages>`):

    .. code:: python

        "regions": {
          ..
          "en-CA": "ca",
          "fr-CA": "ca",
          ..
         }

    .. note::

       The language (aka region) support of Brave's index is limited to very basic
       languages.  The search results for languages like Chinese or Arabic are of
       low quality.

    .. _brave googles:

    Brave Goggles
    =============

    .. _list of Goggles: https://search.brave.com/goggles/discover
    .. _Goggles Whitepaper: https://brave.com/static-assets/files/goggles.pdf
    .. _Goggles Quickstart: https://github.com/brave/goggles-quickstart

    Goggles allow you to choose, alter, or extend the ranking of Brave Search
    results (`Goggles Whitepaper`_).  Goggles are openly developed by the community
    of Brave Search users.

    Select from the `list of Goggles`_ people have published, or create your own
    (`Goggles Quickstart`_).

    .. _brave languages:

    Brave languages
    ===============

    Brave's language support is limited to the UI (menus, area local notations,
    etc).  Brave's index only seems to support a locale, but it does not seem to
    support any languages in its index.  The choice of available languages is very
    small (and its not clear to me where the difference in UI is when switching
    from en-us to en-ca or en-gb).

    In the :py:obj:`EngineTraits object <searx.enginelib.traits.EngineTraits>` the
    UI languages are stored in a custom field named ``ui_lang``:

    .. code:: python

        "custom": {
          "ui_lang": {
            "ca": "ca",
            "de-DE": "de-de",
            "en-CA": "en-ca",
            "en-GB": "en-gb",
            "en-US": "en-us",
            "es": "es",
            "fr-CA": "fr-ca",
            "fr-FR": "fr-fr",
            "ja-JP": "ja-jp",
            "pt-BR": "pt-br",
            "sq-AL": "sq-al"
          }
        },

    Implementations
    ===============

    """

    from typing import Any, TYPE_CHECKING

    from urllib.parse import (
        urlencode,
        urlparse,
    )

    from dateutil import parser
    from lxml import html

    from searx import locales
    from searx.utils import (
        extract_text,
        extr,
        eval_xpath,
        eval_xpath_list,
        eval_xpath_getindex,
        js_variable_to_python,
        get_embeded_stream_url,
    )
    from searx.enginelib.traits import EngineTraits

    if TYPE_CHECKING:
        import logging

        logger: logging.Logger

    traits: EngineTraits

    about = {
        "website": 'https://search.brave.com/',
        "wikidata_id": 'Q22906900',
        "official_api_documentation": None,
        "use_official_api": False,
        "require_api_key": False,
        "results": 'HTML',
    }

    base_url = "https://search.brave.com/"
    categories = []
    brave_category = 'search'
    Goggles = Any
    """Brave supports common web-search, videos, images, news, and goggles search.

    - ``search``: Common WEB search
    - ``videos``: search for videos
    - ``images``: search for images
    - ``news``: search for news
    - ``goggles``: Common WEB search with custom rules
    """

    brave_spellcheck = False
    """Brave supports some kind of spell checking.  When activated, Brave tries to
    fix typos, e.g. it searches for ``food`` when the user queries for ``fooh``.  In
    the UI of Brave the user gets warned about this, since we can not warn the user
    in SearXNG, the spellchecking is disabled by default.
    """

    send_accept_language_header = True
    paging = False
    """Brave only supports paging in :py:obj:`brave_category` ``search`` (UI
    category All) and in the goggles category."""
    max_page = 10
    """Tested 9 pages maximum (``&offset=8``), to be save max is set to 10.  Trying
    to do more won't return any result and you will most likely be flagged as a bot.
    """

    safesearch = True
    safesearch_map = {2: 'strict', 1: 'moderate', 0: 'off'}  # cookie: safesearch=off

    time_range_support = False
    """Brave only supports time-range in :py:obj:`brave_category` ``search`` (UI
    category All) and in the goggles category."""

    time_range_map = {
        'day': 'pd',
        'week': 'pw',
        'month': 'pm',
        'year': 'py',
    }

    def request(query, params):

        # Don't accept br encoding / see https://github.com/searxng/searxng/pull/1787
        params['headers']['Accept-Encoding'] = 'gzip, deflate'

        args = {
            'q': query,
        }
        if brave_spellcheck:
            args['spellcheck'] = '1'

        if brave_category in ('search', 'goggles'):
            if params.get('pageno', 1) - 1:
                args['offset'] = params.get('pageno', 1) - 1
            if time_range_map.get(params['time_range']):
                args['tf'] = time_range_map.get(params['time_range'])

        if brave_category == 'goggles':
            args['goggles_id'] = Goggles

        params["url"] = f"{base_url}{brave_category}?{urlencode(args)}"

        # set properties in the cookies

        params['cookies']['safesearch'] = safesearch_map.get(params['safesearch'], 'off')
        # the useLocation is IP based, we use cookie 'country' for the region
        params['cookies']['useLocation'] = '0'
        params['cookies']['summarizer'] = '0'

        engine_region = traits.get_region(params['searxng_locale'], 'all')
        params['cookies']['country'] = engine_region.split('-')[-1].lower()  # type: ignore

        ui_lang = locales.get_engine_locale(params['searxng_locale'], traits.custom["ui_lang"], 'en-us')
        params['cookies']['ui_lang'] = ui_lang

        logger.debug("cookies %s", params['cookies'])

    def _extract_published_date(published_date_raw):
        if published_date_raw is None:
            return None

        try:
            return parser.parse(published_date_raw)
        except parser.ParserError:
            return None

    def response(resp):

        if brave_category in ('search', 'goggles'):
            return _parse_search(resp)

        datastr = extr(resp.text, "const data = ", ";\n").strip()

        json_data = js_variable_to_python(datastr)
        json_resp = json_data[1]['data']['body']['response']

        if brave_category == 'news':
            return _parse_news(json_resp['news'])

        if brave_category == 'images':
            return _parse_images(json_resp)
        if brave_category == 'videos':
            return _parse_videos(json_resp)

        raise ValueError(f"Unsupported brave category: {brave_category}")

    def _parse_search(resp):

        result_list = []
        dom = html.fromstring(resp.text)

        answer_tag = eval_xpath_getindex(dom, '//div[@class="answer"]', 0, default=None)
        if answer_tag:
            url = eval_xpath_getindex(dom, '//div[@id="featured_snippet"]/a[@class="result-header"]/@href', 0, default=None)
            result_list.append({'answer': extract_text(answer_tag), 'url': url})

        # xpath_results = '//div[contains(@class, "snippet fdb") and @data-type="web"]'
        xpath_results = '//div[contains(@class, "snippet ")]'

        for result in eval_xpath_list(dom, xpath_results):

            url = eval_xpath_getindex(result, './/a[contains(@class, "h")]/@href', 0, default=None)
            title_tag = eval_xpath_getindex(
                result, './/a[contains(@class, "h")]//div[contains(@class, "title")]', 0, default=None
            )
            if url is None or title_tag is None or not urlparse(url).netloc:  # partial url likely means it's an ad
                continue

            content_tag = eval_xpath_getindex(result, './/div[contains(@class, "snippet-description")]', 0, default='')
            pub_date_raw = eval_xpath(result, 'substring-before(.//div[contains(@class, "snippet-description")], "-")')
            thumbnail = eval_xpath_getindex(result, './/img[contains(@class, "thumb")]/@src', 0, default='')

            item = {
                'url': url,
                'title': extract_text(title_tag),
                'content': extract_text(content_tag),
                'publishedDate': _extract_published_date(pub_date_raw),
                'thumbnail': thumbnail,
            }

            video_tag = eval_xpath_getindex(
                result, './/div[contains(@class, "video-snippet") and @data-macro="video"]', 0, default=None
            )
            if video_tag is not None:

                # In my tests a video tag in the WEB search was most often not a
                # video, except the ones from youtube ..

                iframe_src = get_embeded_stream_url(url)
                if iframe_src:
                    item['iframe_src'] = iframe_src
                    item['template'] = 'videos.html'
                    item['thumbnail'] = eval_xpath_getindex(video_tag, './/img/@src', 0, default='')
                    pub_date_raw = extract_text(
                        eval_xpath(video_tag, './/div[contains(@class, "snippet-attributes")]/div/text()')
                    )
                    item['publishedDate'] = _extract_published_date(pub_date_raw)
                else:
                    item['thumbnail'] = eval_xpath_getindex(video_tag, './/img/@src', 0, default='')

            result_list.append(item)

        return result_list

    def _parse_news(json_resp):
        result_list = []

        for result in json_resp["results"]:
            item = {
                'url': result['url'],
                'title': result['title'],
                'content': result['description'],
                'publishedDate': _extract_published_date(result['age']),
            }
            if result['thumbnail'] is not None:
                item['thumbnail'] = result['thumbnail']['src']
            result_list.append(item)

        return result_list

    def _parse_images(json_resp):
        result_list = []

        for result in json_resp["results"]:
            item = {
                'url': result['url'],
                'title': result['title'],
                'content': result['description'],
                'template': 'images.html',
                'resolution': result['properties']['format'],
                'source': result['source'],
                'img_src': result['properties']['url'],
                'thumbnail_src': result['thumbnail']['src'],
            }
            result_list.append(item)

        return result_list

    def _parse_videos(json_resp):
        result_list = []

        for result in json_resp["results"]:

            url = result['url']
            item = {
                'url': url,
                'title': result['title'],
                'content': result['description'],
                'template': 'videos.html',
                'length': result['video']['duration'],
                'duration': result['video']['duration'],
                'publishedDate': _extract_published_date(result['age']),
            }

            if result['thumbnail'] is not None:
                item['thumbnail'] = result['thumbnail']['src']

            iframe_src = get_embeded_stream_url(url)
            if iframe_src:
                item['iframe_src'] = iframe_src

            result_list.append(item)

        return result_list

    def fetch_traits(engine_traits: EngineTraits):
        """Fetch :ref:`languages <brave languages>` and :ref:`regions <brave
        regions>` from Brave."""

        # pylint: disable=import-outside-toplevel, too-many-branches

        import babel.languages
        from searx.locales import region_tag, language_tag
        from searx.network import get  # see https://github.com/searxng/searxng/issues/762

        engine_traits.custom["ui_lang"] = {}

        headers = {
            'Accept-Encoding': 'gzip, deflate',
        }
        lang_map = {'no': 'nb'}  # norway

        # languages (UI)

        resp = get('https://search.brave.com/settings', headers=headers)

        if not resp.ok:  # type: ignore
            print("ERROR: response from Brave is not OK.")
        dom = html.fromstring(resp.text)  # type: ignore

        for option in dom.xpath('//section//option[@value="en-us"]/../option'):

            ui_lang = option.get('value')
            try:
                l = babel.Locale.parse(ui_lang, sep='-')
                if l.territory:
                    sxng_tag = region_tag(babel.Locale.parse(ui_lang, sep='-'))
                else:
                    sxng_tag = language_tag(babel.Locale.parse(ui_lang, sep='-'))

            except babel.UnknownLocaleError:
                print("ERROR: can't determine babel locale of Brave's (UI) language %s" % ui_lang)
                continue

            conflict = engine_traits.custom["ui_lang"].get(sxng_tag)
            if conflict:
                if conflict != ui_lang:
                    print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, ui_lang))
                continue
            engine_traits.custom["ui_lang"][sxng_tag] = ui_lang

        # search regions of brave

        resp = get('https://cdn.search.brave.com/serp/v2/_app/immutable/chunks/parameters.734c106a.js', headers=headers)

        if not resp.ok:  # type: ignore
            print("ERROR: response from Brave is not OK.")

        country_js = resp.text[resp.text.index("options:{all") + len('options:') :]  # type: ignore
        country_js = country_js[: country_js.index("},k={default")]
        country_tags = js_variable_to_python(country_js)

        for k, v in country_tags.items():
            if k == 'all':
                engine_traits.all_locale = 'all'
                continue
            country_tag = v['value']

            # add official languages of the country ..
            for lang_tag in babel.languages.get_official_languages(country_tag, de_facto=True):
                lang_tag = lang_map.get(lang_tag, lang_tag)
                sxng_tag = region_tag(babel.Locale.parse('%s_%s' % (lang_tag, country_tag.upper())))
                # print("%-20s: %s <-- %s" % (v['label'], country_tag, sxng_tag))

                conflict = engine_traits.regions.get(sxng_tag)
                if conflict:
                    if conflict != country_tag:
                        print("CONFLICT: babel %s --> %s, %s" % (sxng_tag, conflict, country_tag))
                        continue
                engine_traits.regions[sxng_tag] = country_tag