# SPDX-License-Identifier: AGPL-3.0-or-later
"""
 General mediawiki-engine (Web)
"""

from string import Formatter
from urllib.parse import urlencode, quote

from searx.utils import html_to_text

# about
about = {
    "website": None,
    "wikidata_id": None,
    "official_api_documentation": 'http://www.mediawiki.org/wiki/API:Search',
    "use_official_api": True,
    "require_api_key": False,
    "results": 'JSON',
}

# engine dependent config
categories = ['general']
paging = True
number_of_results = 1
search_type = 'nearmatch'  # possible values: title, text, nearmatch

# search-url
base_url = 'https://{language}.wikipedia.org/'
search_postfix = (
    'w/api.php?action=query'
    '&list=search'
    '&{query}'
    '&format=json'
    '&sroffset={offset}'
    '&srlimit={limit}'
    '&srwhat={searchtype}'
)


# do search-request
def request(query, params):
    offset = (params['pageno'] - 1) * number_of_results

    string_args = dict(
        query=urlencode({'srsearch': query}), offset=offset, limit=number_of_results, searchtype=search_type
    )

    format_strings = list(Formatter().parse(base_url))

    if params['language'] == 'all':
        language = 'en'
    else:
        language = params['language'].split('-')[0]

    # format_string [('https://', 'language', '', None), ('.wikipedia.org/', None, None, None)]
    if any(x[1] == 'language' for x in format_strings):
        string_args['language'] = language

    # write search-language back to params, required in response
    params['language'] = language

    search_url = base_url + search_postfix

    params['url'] = search_url.format(**string_args)

    return params


# get response from search-request
def response(resp):
    results = []

    search_results = resp.json()

    # return empty array if there are no results
    if not search_results.get('query', {}).get('search'):
        return []

    # parse results
    for result in search_results['query']['search']:
        if result.get('snippet', '').startswith('#REDIRECT'):
            continue
        url = (
            base_url.format(language=resp.search_params['language'])
            + 'wiki/'
            + quote(result['title'].replace(' ', '_').encode())
        )

        # append result
        results.append({'url': url, 'title': result['title'], 'content': html_to_text(result.get('snippet', ''))})

    # return results
    return results