"""代理 API 响应解析。"""

import json
import re
from typing import Optional


def parse_proxy_response(text: str) -> tuple[list[str], Optional[str]]:
    """
    解析代理 API 响应，支持 JSON 格式与旧版纯文本格式。

    Returns:
        (proxy_urls, whitelist_ip)
        - proxy_urls: 解析到的所有代理地址列表（http://ip:port）
        - whitelist_ip: 需要添加到白名单的 IP，无错误时为 None
    """
    text = (text or "").strip()
    if not text:
        return [], None

    try:
        data = json.loads(text)
        if isinstance(data, dict):
            code = data.get("code")
            msg = data.get("msg", "") or ""
            if code != 0 and ("白名单" in msg or "添加白名单" in msg):
                ip_match = re.search(r"(\d+\.\d+\.\d+\.\d+)", msg)
                if ip_match:
                    return [], ip_match.group(1)

            data_field = data.get("data")
            proxies: list[str] = []
            if isinstance(data_field, list):
                for item in data_field:
                    if not isinstance(item, dict):
                        continue
                    ip = item.get("IP") or item.get("ip")
                    port = item.get("Port") or item.get("port")
                    if ip and port:
                        proxies.append(f"http://{ip}:{port}")
            if proxies:
                return proxies, None

            if code == 0 and not proxies:
                return [], None
    except (json.JSONDecodeError, ValueError):
        pass

    if "添加白名单" in text or "白名单" in text:
        ip_match = re.search(r"(\d+\.\d+\.\d+\.\d+)", text)
        if ip_match:
            return [], ip_match.group(1)

    matches = re.findall(r"(\d+\.\d+\.\d+\.\d+):(\d+)", text)
    proxies = [f"http://{ip}:{port}" for ip, port in matches]
    if proxies:
        return proxies, None

    return [], None