from __future__ import unicode_literals

from .common import InfoExtractor
from ..compat import (
    compat_b64decode,
    compat_urllib_parse_unquote_plus,
)
from ..utils import (
    determine_ext,
    ExtractorError,
    int_or_none,
    js_to_json,
    KNOWN_EXTENSIONS,
    parse_filesize,
    rot47,
    url_or_none,
    urlencode_postdata,
)


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

        webpage, urlh = self._download_webpage_handle(url, video_id)

        if self._FILE_NOT_FOUND in webpage:
            raise ExtractorError("Video %s does not exist" % video_id, expected=True)

        video_url = self._extract_video_url(webpage, video_id, url)

        title = self._extract_title(webpage)
        filesize = int_or_none(self._extract_filesize(webpage))

        return {
            "id": video_id,
            "url": video_url,
            "ext": "mp4",
            "filesize": filesize,
            "title": title,
        }

    def _extract_title(self, webpage):
        return compat_b64decode(
            self._html_search_meta("full:title", webpage, "title")
        ).decode("utf-8")

    def _extract_filesize(self, webpage):
        return self._html_search_meta("full:size", webpage, "file size", fatal=False)


class SharedIE(SharedBaseIE):
    IE_DESC = "shared.sx"
    _VALID_URL = r"https?://shared\.sx/(?P<id>[\da-z]{10})"
    _FILE_NOT_FOUND = ">File does not exist<"

    _TEST = {
        "url": "http://shared.sx/0060718775",
        "md5": "106fefed92a8a2adb8c98e6a0652f49b",
        "info_dict": {
            "id": "0060718775",
            "ext": "mp4",
            "title": "Bmp4",
            "filesize": 1720110,
        },
    }

    def _extract_video_url(self, webpage, video_id, url):
        download_form = self._hidden_inputs(webpage)

        video_page = self._download_webpage(
            url,
            video_id,
            "Downloading video page",
            data=urlencode_postdata(download_form),
            headers={
                "Content-Type": "application/x-www-form-urlencoded",
                "Referer": url,
            },
        )

        video_url = self._html_search_regex(
            r'data-url=(["\'])(?P<url>(?:(?!\1).)+)\1',
            video_page,
            "video URL",
            group="url",
        )

        return video_url


class VivoIE(SharedBaseIE):
    IE_DESC = "vivo.sx"
    _VALID_URL = r"https?://vivo\.s[xt]/(?P<id>[\da-z]{10})"
    _FILE_NOT_FOUND = ">The file you have requested does not exists or has been removed"

    _TESTS = [
        {
            "url": "http://vivo.sx/d7ddda0e78",
            "md5": "15b3af41be0b4fe01f4df075c2678b2c",
            "info_dict": {
                "id": "d7ddda0e78",
                "ext": "mp4",
                "title": "Chicken",
                "filesize": 515659,
            },
        },
        {
            "url": "http://vivo.st/d7ddda0e78",
            "only_matching": True,
        },
    ]

    def _extract_title(self, webpage):
        title = self._html_search_regex(
            r'data-name\s*=\s*(["\'])(?P<title>(?:(?!\1).)+)\1',
            webpage,
            "title",
            default=None,
            group="title",
        )
        if title:
            ext = determine_ext(title)
            if ext.lower() in KNOWN_EXTENSIONS:
                title = title.rpartition("." + ext)[0]
            return title
        return self._og_search_title(webpage)

    def _extract_filesize(self, webpage):
        return parse_filesize(
            self._search_regex(
                r'data-type=["\']video["\'][^>]*>Watch.*?<strong>\s*\((.+?)\)',
                webpage,
                "filesize",
                fatal=False,
            )
        )

    def _extract_video_url(self, webpage, video_id, url):
        def decode_url_old(encoded_url):
            return compat_b64decode(encoded_url).decode("utf-8")

        stream_url = self._search_regex(
            r'data-stream\s*=\s*(["\'])(?P<url>(?:(?!\1).)+)\1',
            webpage,
            "stream url",
            default=None,
            group="url",
        )
        if stream_url:
            stream_url = url_or_none(decode_url_old(stream_url))
        if stream_url:
            return stream_url

        def decode_url(encoded_url):
            return rot47(compat_urllib_parse_unquote_plus(encoded_url))

        return decode_url(
            self._parse_json(
                self._search_regex(
                    r"(?s)InitializeStream\s*\(\s*({.+?})\s*\)\s*;", webpage, "stream"
                ),
                video_id,
                transform_source=js_to_json,
            )["source"]
        )
