"""代理管理模块"""

import json
import re
import threading
import time
import requests
from typing import Optional
from loguru import logger


class ProxyManager:
    """代理管理器（带已验证代理池缓存，批次内共享复用）"""

    def __init__(self, api_url: str = "", whitelist_uid: str = "", whitelist_ukey: str = ""):
        self.api_url = api_url
        self.whitelist_uid = whitelist_uid
        self.whitelist_ukey = whitelist_ukey
        self.current_proxy: Optional[str] = None
        self._cond = threading.Condition()
        # 已验证可用的代理池: {proxy_url: validated_timestamp}
        self._verified_pool: dict[str, float] = {}
        self._pool_ttl = 90  # 代理验证后90秒内可复用
        self._fetching = False  # 是否有线程正在获取代理

    def _pick_from_pool_locked(self) -> Optional[str]:
        """从池中取一个未过期的代理（调用前需持有锁）"""
        now = time.time()
        # 清理过期代理
        expired = [p for p, t in self._verified_pool.items() if now - t > self._pool_ttl]
        for p in expired:
            del self._verified_pool[p]
        # 取第一个可用的
        for proxy in self._verified_pool:
            self.current_proxy = proxy
            return proxy
        return None

    def get_proxy(self, max_attempts: int = 5) -> Optional[str]:
        """
        获取可用代理IP，优先从已验证代理池复用。
        线程安全：池空时只有一个线程调API获取并验证所有代理入池，其他线程等待后复用。

        Returns:
            代理URL，格式: http://ip:port
        """
        with self._cond:
            # 1. 优先从池中取未过期的
            proxy = self._pick_from_pool_locked()
            if proxy:
                logger.debug(f"从代理池复用: {proxy} (池剩余 {len(self._verified_pool)})")
                return proxy
            # 2. 已有线程在获取，等待结果
            if self._fetching:
                logger.debug("代理池空，等待其他线程获取...")
                self._cond.wait(timeout=60)
                proxy = self._pick_from_pool_locked()
                if proxy:
                    logger.debug(f"等待后从代理池复用: {proxy} (池剩余 {len(self._verified_pool)})")
                    return proxy
                return None
            # 3. 自己去获取
            self._fetching = True

        # 释放锁后执行耗时的API调用+验证
        try:
            proxies_all, msg = self._fetch_and_verify_all(max_attempts)
        finally:
            with self._cond:
                self._fetching = False
                self._cond.notify_all()

        if proxies_all:
            with self._cond:
                now = time.time()
                for p in proxies_all:
                    self._verified_pool[p] = now
                first = proxies_all[0]
                self.current_proxy = first
                logger.info(f"代理池充盈 {len(proxies_all)} 个可用代理: {first} ...")
                return first
        logger.warning(f"获取代理失败: {msg}")
        return None

    def _fetch_and_verify_all(self, max_attempts: int) -> tuple[Optional[list[str]], str]:
        """调代理API获取一批代理，并发验证所有可用代理，自动处理白名单同步。"""
        last_error = ""
        last_synced_ip: Optional[str] = None

        for attempt in range(1, max_attempts + 1):
            if attempt > 1:
                time.sleep(min(attempt - 1, 2))

            # 每次尝试前主动同步白名单（出口IP可能漂移，需重新同步）
            if self.whitelist_uid and self.whitelist_ukey:
                from core.douyu.whitelist import get_local_exit_ip, WhitelistManager
                local_ip = get_local_exit_ip()
                if local_ip and local_ip != last_synced_ip:
                    logger.info(f"[尝试 {attempt}] 检测出口IP: {local_ip}，同步白名单...")
                    manager = WhitelistManager(self.whitelist_uid, self.whitelist_ukey)
                    ok, sync_msg = manager.sync_ip(local_ip)
                    if ok:
                        last_synced_ip = local_ip
                        logger.info(f"白名单同步成功: {sync_msg}")
                        # 等待白名单生效
                        time.sleep(2)
                    else:
                        logger.warning(f"白名单同步失败: {sync_msg}")
                elif local_ip == last_synced_ip:
                    logger.debug(f"[尝试 {attempt}] 出口IP未变: {local_ip}")

            try:
                response = requests.get(self.api_url, timeout=10)
                response.raise_for_status()
                text = response.text.strip()

                proxy_urls, whitelist_ip = parse_proxy_response(text)

                if proxy_urls:
                    logger.info(f"获取到 {len(proxy_urls)} 个代理，并发验证所有")
                    available, msg = verify_proxies_concurrent(proxy_urls, return_all=True)
                    if available:
                        return available, msg
                    last_error = msg
                    logger.warning(f"代理预检 {attempt}/{max_attempts}: {last_error}")
                    continue

                # 代理API返回白名单错误
                if whitelist_ip and self.whitelist_uid and self.whitelist_ukey:
                    logger.warning(f"代理需要白名单IP: {whitelist_ip}，自动同步...")
                    from core.douyu.whitelist import WhitelistManager
                    manager = WhitelistManager(self.whitelist_uid, self.whitelist_ukey)
                    ok, sync_msg = manager.sync_ip(whitelist_ip)
                    if ok:
                        last_synced_ip = whitelist_ip
                        logger.info("白名单已更新，等待2秒后重试...")
                        time.sleep(2)
                        continue
                    return None, f'白名单同步失败: {sync_msg}'

                last_error = '代理API响应无法解析'
                logger.warning(f"代理预检 {attempt}/{max_attempts}: {last_error}: {text[:80]}")

            except Exception as exc:
                last_error = f'代理API请求失败: {exc}'
                logger.warning(f"代理预检 {attempt}/{max_attempts}: {last_error}")

        return None, f'代理预检失败（{max_attempts}次尝试均失败）: {last_error}'

    def mark_bad(self, proxy_url: str) -> None:
        """标记代理为不可用，从池中移除（极验失败/代理连接失败时调用）"""
        with self._cond:
            removed = self._verified_pool.pop(proxy_url, None)
            if self.current_proxy == proxy_url:
                self.current_proxy = None
            if removed:
                logger.info(f"代理标记为不可用并移出池: {proxy_url} (池剩余 {len(self._verified_pool)})")
            self._cond.notify_all()

    def get_proxies_dict(self, proxy: str = None) -> dict:
        """获取requests使用的proxies字典"""
        proxy = proxy or self.current_proxy
        if proxy:
            return {'http': proxy, 'https': proxy}
        return {}

    def verify_proxy(self, proxy: str = None) -> bool:
        """验证代理是否可用"""
        proxy = proxy or self.current_proxy
        if not proxy:
            return False
        try:
            response = requests.get(
                'https://httpbin.org/ip',
                proxies={'http': proxy, 'https': proxy},
                timeout=10
            )
            if response.status_code == 200:
                data = response.json()
                logger.info(f"代理验证成功，当前IP: {data.get('origin')}")
                return True
            return False
        except Exception as e:
            logger.error(f"代理验证失败: {e}")
            return False


def get_proxy_manager(
    api_url: str = "",
    whitelist_uid: str = "",
    whitelist_ukey: str = "",
) -> ProxyManager:
    """获取代理管理器实例"""
    return ProxyManager(api_url, whitelist_uid=whitelist_uid, whitelist_ukey=whitelist_ukey)


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。

    JSON 格式示例：
        正常: {"code":0,"success":"true","msg":"","data":[{"IP":"1.2.3.4","Port":5791,...}]}
        白名单错误: {"code":-1,"success":"true","msg":"51.请先添加白名单：39.144.109.21","data":""}

    旧版纯文本格式（兼容）：
        正常: 1.2.3.4:5791\\n5.6.7.8:8080
        白名单错误: 请先添加白名单：39.144.109.21

    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（当API返回白名单错误时），无错误时为 None
    """
    text = (text or "").strip()
    if not text:
        return [], None

    # 优先尝试 JSON 解析
    try:
        data = json.loads(text)
        if isinstance(data, dict):
            # 白名单错误：code != 0 且 msg 含白名单提示
            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)

            # 正常返回：从 data 数组提取 IP/Port
            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

            # data 为空但 code==0，可能代理暂时不可用
            if code == 0 and not proxies:
                return [], None
    except (json.JSONDecodeError, ValueError):
        # 不是 JSON，回退到文本解析
        pass

    # 旧版文本格式：白名单错误优先检测
    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)

    # 旧版文本格式：解析所有 ip:port
    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


def verify_proxy_url(proxy_url: str, timeout: tuple = (5, 8)) -> tuple[bool, str]:
    """
    验证代理是否可用，只验证斗鱼主站（登录的最终目标）。

    Returns:
        (是否可用, 消息)
    """
    from utils.http_logger import log_http
    import time as _time

    proxies = {'http': proxy_url, 'https': proxy_url}
    started = _time.monotonic()
    try:
        response = requests.get(
            'https://www.douyu.com',
            proxies=proxies,
            timeout=timeout,
            headers={'User-Agent': 'Mozilla/5.0'},
        )
        elapsed = _time.monotonic() - started
        response.raise_for_status()
        log_http(
            category="proxy_verify", method="GET", url="https://www.douyu.com",
            status_code=response.status_code, response_body=f"代理可用: {proxy_url}",
            duration=elapsed, proxy=proxy_url, tag="proxy_verify",
        )
        return True, '代理可用 → 斗鱼主站'
    except Exception as e:
        elapsed = _time.monotonic() - started
        err_msg = str(e)
        if 'Tunnel connection failed' in err_msg or '503' in err_msg:
            detail = '代理拒绝连接（白名单可能未生效）'
        elif 'timed out' in err_msg.lower():
            detail = '连接超时'
        else:
            detail = type(e).__name__
        logger.debug(f"代理验证失败 [{proxy_url}]: {detail}")
        log_http(
            category="proxy_verify", method="GET", url="https://www.douyu.com",
            duration=elapsed, error=f"[{proxy_url}] {detail}: {err_msg[:200]}",
            proxy=proxy_url, tag="proxy_verify",
        )
        return False, detail


def verify_proxies_concurrent(proxy_urls: list[str], timeout: tuple = (5, 8), max_workers: int = 5, return_all: bool = False) -> tuple[Optional[str | list[str]], str]:
    """
    并发验证多个代理URL。

    Args:
        proxy_urls: 代理URL列表
        timeout: 验证超时
        max_workers: 最大并发数
        return_all: True 时返回所有可用代理列表；False（默认）返回第一个可用的

    Returns:
        return_all=False: (可用代理URL或None, 消息)
        return_all=True: (可用代理URL列表或None, 消息)
    """
    if not proxy_urls:
        return None, '无代理可验证'

    if len(proxy_urls) == 1:
        ok, msg = verify_proxy_url(proxy_urls[0], timeout)
        if ok:
            return (proxy_urls if return_all else proxy_urls[0]), msg
        return None, msg

    from concurrent.futures import ThreadPoolExecutor, as_completed

    if return_all:
        # 收集所有可用代理（不取消任何任务）
        available: list[str] = []
        with ThreadPoolExecutor(max_workers=min(max_workers, len(proxy_urls))) as executor:
            future_map = {
                executor.submit(verify_proxy_url, p, timeout): p
                for p in proxy_urls
            }
            for future in as_completed(future_map):
                try:
                    ok, _ = future.result()
                    if ok:
                        available.append(future_map[future])
                except Exception:
                    continue
        if available:
            logger.success(f"并发验证找到 {len(available)}/{len(proxy_urls)} 个可用代理")
            return available, f'找到 {len(available)} 个可用代理'
        return None, f'共 {len(proxy_urls)} 个代理均不可用'

    # 默认：返回第一个可用的，取消其余
    with ThreadPoolExecutor(max_workers=min(max_workers, len(proxy_urls))) as executor:
        future_map = {
            executor.submit(verify_proxy_url, p, timeout): p
            for p in proxy_urls
        }
        for future in as_completed(future_map):
            proxy_url = future_map[future]
            try:
                ok, msg = future.result()
                if ok:
                    logger.success(f"并发验证找到可用代理: {proxy_url}")
                    for f in future_map:
                        if f != future:
                            f.cancel()
                    return proxy_url, msg
            except Exception:
                continue

    return None, f'共 {len(proxy_urls)} 个代理均不可用'


def resolve_working_proxy(
    api_url: str,
    whitelist_uid: str = "",
    whitelist_ukey: str = "",
    max_attempts: int = 4,
    log_func=None,
) -> tuple[Optional[str], str]:
    """
    从代理API获取可用代理，自动处理白名单同步。
    支持API返回多个代理IP，逐一验证直到找到可用的。

    Args:
        api_url: 代理API地址
        whitelist_uid: 白名单UID（启用白名单时传入）
        whitelist_ukey: 白名单UKEY
        max_attempts: 最大获取尝试次数（默认4次）
        log_func: 日志回调函数 (level, message)

    Returns:
        (代理URL, 消息)
    """
    def log(level, msg):
        if log_func:
            log_func(level, msg)
        else:
            getattr(logger, level if level in ('info', 'warning', 'error', 'success') else 'info', logger.info)(msg)

    synced_whitelist = False
    last_error = ""

    for attempt in range(1, max_attempts + 1):
        # 重试之间增加退避延迟，避免代理API返回同一个不可用IP
        if attempt > 1:
            delay = min(attempt - 1, 2)
            log('info', f'等待 {delay}s 后重试...')
            time.sleep(delay)

        log('info', f'代理预检 {attempt}/{max_attempts}: 正在获取代理')
        try:
            response = requests.get(api_url, timeout=10)
            response.raise_for_status()
            text = response.text.strip()

            proxy_urls, whitelist_ip = parse_proxy_response(text)

            if proxy_urls:
                log('info', f'获取到 {len(proxy_urls)} 个代理，并发验证')
                proxy_url, msg = verify_proxies_concurrent(proxy_urls)
                if proxy_url:
                    log('success', f'代理预检成功: {proxy_url}')
                    return proxy_url, msg
                last_error = msg
                log('warning', f'代理预检 {attempt}/{max_attempts}: {last_error}')
                continue

            # 代理API返回白名单错误
            if whitelist_ip and not synced_whitelist and whitelist_uid and whitelist_ukey:
                log('warning', f'代理需要白名单IP: {whitelist_ip}，自动同步...')
                from core.douyu.whitelist import WhitelistManager
                manager = WhitelistManager(whitelist_uid, whitelist_ukey)
                ok, sync_msg = manager.sync_ip(whitelist_ip)
                log('success' if ok else 'error', f'白名单同步: {sync_msg}')
                if ok:
                    synced_whitelist = True
                    log('info', '白名单已更新，等待2秒后重试...')
                    time.sleep(2)
                    continue
                return None, f'白名单同步失败: {sync_msg}'

            last_error = f'代理API响应无法解析'
            log('warning', f'代理预检 {attempt}/{max_attempts}: {last_error}: {text[:80]}')

        except Exception as exc:
            last_error = f'代理API请求失败: {exc}'
            log('warning', f'代理预检 {attempt}/{max_attempts}: {last_error}')

    return None, f'代理预检失败（{max_attempts}次尝试均失败）: {last_error}'