"""抖音直播间页面临时解析主播昵称（仅供控制台展示，可能随页面改版失效）。"""
from __future__ import annotations

import re
import urllib.error
import urllib.request
from typing import Any


_UA = (
    "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
    "(KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
)


def _norm_douyin_live_url(url: str) -> str:
    u = (url or "").strip()
    if not u:
        return ""
    u = u.split("#")[0].strip()
    if u.startswith("http://"):
        u = "https://" + u[7:]
    if not u.startswith("https://"):
        u = "https://" + u
    return u


def _room_id_from_url(url: str) -> str:
    m = re.search(r"live\.douyin\.com/([a-zA-Z0-9_-]+)", url, re.I)
    return m.group(1) if m else ""


def fetch_douyin_anchor_name(url: str) -> dict[str, Any]:
    u = _norm_douyin_live_url(url)
    if not re.search(r"douyin\.com", u, re.I):
        return {"ok": False, "error": "非抖音链接", "url": url, "room_id": "", "anchor_name": ""}
    rid = _room_id_from_url(u)
    if not rid:
        return {"ok": False, "error": "无法解析房间号", "url": url, "room_id": "", "anchor_name": ""}
    try:
        req = urllib.request.Request(u, headers={"User-Agent": _UA, "Accept": "text/html,*/*"})
        with urllib.request.urlopen(req, timeout=12) as resp:
            html = resp.read().decode("utf-8", errors="ignore")
    except urllib.error.HTTPError as e:
        return {"ok": False, "error": f"HTTP {e.code}", "url": u, "room_id": rid, "anchor_name": ""}
    except Exception as e:
        return {"ok": False, "error": str(e), "url": u, "room_id": rid, "anchor_name": ""}

    name = ""
    for pat in (
        r'"nickname"\s*:\s*"([^"\\]+)"',
        r'"nickName"\s*:\s*"([^"\\]+)"',
        r'"owner"\s*:\s*\{[^}]*"nickname"\s*:\s*"([^"\\]+)"',
    ):
        m = re.search(pat, html)
        if m:
            name = m.group(1).strip()
            break
    if not name:
        m2 = re.search(r"主播[：:]\s*([^\s<\"]{1,40})", html)
        if m2:
            name = m2.group(1).strip()

    return {
        "ok": True,
        "url": u,
        "room_id": rid,
        "anchor_name": name or "",
        "error": "" if name else "未解析到昵称",
    }