from __future__ import unicode_literals

from .common import InfoExtractor
from ..utils import ExtractorError


class CommonMistakesIE(InfoExtractor):
    IE_DESC = False  # Do not list
    _VALID_URL = r'''(?x)
        (?:url|URL)$
    '''

    _TESTS = [{
        'url': 'url',
        'only_matching': True,
    }, {
        'url': 'URL',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        msg = (
            'You\'ve asked yt-dlp to download the URL "%s". '
            'That doesn\'t make any sense. '
            'Simply remove the parameter in your command or configuration.'
        ) % url
        if not self.get_param('verbose'):
            msg += ' Add -v to the command line to see what arguments and configuration yt-dlp has'
        raise ExtractorError(msg, expected=True)


class UnicodeBOMIE(InfoExtractor):
    IE_DESC = False
    _VALID_URL = r'(?P<bom>\ufeff)(?P<id>.*)$'

    _TESTS = [{
        'url': '\ufeffhttp://www.youtube.com/watch?v=BaW_jenozKc',
        'only_matching': True,
    }]

    def _real_extract(self, url):
        real_url = self._match_id(url)
        self.report_warning(
            'Your URL starts with a Byte Order Mark (BOM). '
            'Removing the BOM and looking for "%s" ...' % real_url)
        return self.url_result(real_url)