# coding: utf-8
from __future__ import unicode_literals

import re

from .common import InfoExtractor
from ..compat import compat_chr
from ..utils import (
    decode_packed_codes,
    ExtractorError,
)


class VShareIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.)?vshare\.io/[dv]/(?P<id>[^/?#&]+)'
    _TESTS = [{
        'url': 'https://vshare.io/d/0f64ce6',
        'md5': '17b39f55b5497ae8b59f5fbce8e35886',
        'info_dict': {
            'id': '0f64ce6',
            'title': 'vl14062007715967',
            'ext': 'mp4',
        }
    }, {
        'url': 'https://vshare.io/v/0f64ce6/width-650/height-430/1',
        'only_matching': True,
    }]

    @staticmethod
    def _extract_urls(webpage):
        return re.findall(
            r'<iframe[^>]+?src=["\'](?P<url>(?:https?:)?//(?:www\.)?vshare\.io/v/[^/?#&]+)',
            webpage)

    def _extract_packed(self, webpage):
        packed = self._search_regex(
            r'(eval\(function.+)', webpage, 'packed code')
        unpacked = decode_packed_codes(packed)
        digits = self._search_regex(r'\[((?:\d+,?)+)\]', unpacked, 'digits')
        digits = [int(digit) for digit in digits.split(',')]
        key_digit = self._search_regex(
            r'fromCharCode\(.+?(\d+)\)}', unpacked, 'key digit')
        chars = [compat_chr(d - int(key_digit)) for d in digits]
        return ''.join(chars)

    def _real_extract(self, url):
        video_id = self._match_id(url)

        webpage = self._download_webpage(
            'https://vshare.io/v/%s/width-650/height-430/1' % video_id,
            video_id)

        title = self._html_search_regex(
            r'<title>([^<]+)</title>', webpage, 'title')
        title = title.split(' - ')[0]

        error = self._html_search_regex(
            r'(?s)<div[^>]+\bclass=["\']xxx-error[^>]+>(.+?)</div', webpage,
            'error', default=None)
        if error:
            raise ExtractorError(error, expected=True)

        info = self._parse_html5_media_entries(
            url, '<video>%s</video>' % self._extract_packed(webpage),
            video_id)[0]

        self._sort_formats(info['formats'])

        info.update({
            'id': video_id,
            'title': title,
        })

        return info
