"""Extracteur Sibnet (video.sibnet.ru) — page shell/watch → mp4 direct.

La page embed `shell.php?videoid=N` (ou la page publique `/videoN`) contient
une config jwplayer du type `player.src([{src: "/v/<hash>/<id>.mp4"}])`.
`shell.php` répond 403 depuis certains réseaux : on retombe alors sur la page
publique de la vidéo, qui expose la même config.
"""

import logging
import re
from urllib.parse import urljoin

from app.scrapers.base import HosterExtractor, ScrapeError, VideoLink, register_hoster
from app.scrapers.http import fetch

logger = logging.getLogger(__name__)

_BASE = "https://video.sibnet.ru"
_VIDEO_ID_RE = re.compile(r"(?:videoid=|/video)(\d+)")
_MP4_PATTERNS = (
    re.compile(r'player\.src\(\[\{src:\s*"(?P<url>/v/[^"]+?\.mp4)"'),
    re.compile(r'["\'](?P<url>/v/[0-9a-f]{32}/\d+\.mp4)["\']'),
    re.compile(r'["\'](?P<url>https?://[^"\']*?/v/[^"\']+?\.mp4)["\']'),
)


@register_hoster
class SibnetExtractor(HosterExtractor):
    name = "sibnet"
    domains = ("video.sibnet.ru",)

    async def extract(self, embed_url: str) -> VideoLink:
        match = _VIDEO_ID_RE.search(embed_url)
        if not match:
            raise ScrapeError(f"sibnet : identifiant vidéo introuvable dans {embed_url}")
        video_id = match.group(1)
        watch_url = f"{_BASE}/video{video_id}"

        pages: list[tuple[str, str]] = []
        try:
            pages.append(("embed", await fetch(embed_url, retries=0)))
        except ScrapeError as exc:
            logger.info(
                "sibnet : page embed %s inaccessible (%s), essai page publique", embed_url, exc
            )
        try:
            pages.append(("watch", await fetch(watch_url, retries=1)))
        except ScrapeError as exc:
            logger.error("sibnet : page publique %s inaccessible : %s", watch_url, exc)

        for source, html in pages:
            url = self._find_mp4(html, source)
            if url:
                return VideoLink(
                    url=url,
                    hoster=self.name,
                    headers={"Referer": watch_url},
                    is_hls=False,
                )
        raise ScrapeError(f"sibnet : URL mp4 introuvable pour la vidéo {video_id}")

    def _find_mp4(self, html: str, source: str) -> str | None:
        for pattern in _MP4_PATTERNS:
            match = pattern.search(html)
            if match:
                url = urljoin(_BASE + "/", match.group("url"))
                logger.debug("sibnet : mp4 trouvé via %s → %s", source, url)
                return url
        return None