from __future__ import annotations

import re
from typing import Any

from aiortc import RTCIceCandidate


def parse_ice(data: dict[str, Any]) -> RTCIceCandidate | None:
    """解析ICE候选者字符串为RTCIceCandidate对象"""
    match = re.match(
        r'candidate:(\S+) (\d) (\S+) (\d+) (\S+) (\d+) typ (\S+)(?: raddr (\S+) rport (\d+))?',
        data["candidate"],
    )
    if not match:
        return None
    g = match.groups()
    cand = RTCIceCandidate(
        foundation=g[0],
        component=int(g[1]),
        protocol=g[2].lower(),
        priority=int(g[3]),
        ip=g[4],
        port=int(g[5]),
        type=g[6],
        relatedAddress=g[7],
        relatedPort=int(g[8]) if g[8] else None,
    )
    cand.sdpMid = data.get("sdpMid")
    cand.sdpMLineIndex = data.get("sdpMLineIndex", 0)
    return cand