"""通用 HTTP 客户端 - 基于 curl_cffi，支持代理、重试、会话管理"""
"""
HTTP 客户端封装
基于 curl_cffi 的 HTTP 请求封装，支持代理和错误处理
"""

import time
import json
from typing import Optional, Dict, Any, Union, Tuple
from dataclasses import dataclass
import logging

from curl_cffi import requests as cffi_requests
from curl_cffi.requests import Session, Response





logger = logging.getLogger(__name__)


@dataclass
class RequestConfig:
    """HTTP 请求配置"""
    timeout: int = 30
    max_retries: int = 3
    retry_delay: float = 1.0
    impersonate: str = "chrome"
    verify_ssl: bool = True
    follow_redirects: bool = True


class HTTPClientError(Exception):
    """HTTP 客户端异常"""
    pass


class HTTPClient:
    """
    HTTP 客户端封装
    支持代理、重试、错误处理和会话管理
    """

    def __init__(
        self,
        proxy_url: Optional[str] = None,
        config: Optional[RequestConfig] = None,
        session: Optional[Session] = None
    ):
        """
        初始化 HTTP 客户端

        Args:
            proxy_url: 代理 URL，如 "http://127.0.0.1:7890"
            config: 请求配置
            session: 可重用的会话对象
        """
        self.proxy_url = proxy_url
        self.config = config or RequestConfig()
        self._session = session

    @property
    def proxies(self) -> Optional[Dict[str, str]]:
        """获取代理配置"""
        if not self.proxy_url:
            return None
        return {
            "http": self.proxy_url,
            "https": self.proxy_url,
        }

    @property
    def session(self) -> Session:
        """获取会话对象（单例）"""
        if self._session is None:
            self._session = Session(
                proxies=self.proxies,
                impersonate=self.config.impersonate,
                verify=self.config.verify_ssl,
                timeout=self.config.timeout
            )
        return self._session

    def request(
        self,
        method: str,
        url: str,
        **kwargs
    ) -> Response:
        """
        发送 HTTP 请求

        Args:
            method: HTTP 方法 (GET, POST, PUT, DELETE, etc.)
            url: 请求 URL
            **kwargs: 其他请求参数

        Returns:
            Response 对象

        Raises:
            HTTPClientError: 请求失败
        """
        # 设置默认参数
        kwargs.setdefault("timeout", self.config.timeout)
        kwargs.setdefault("allow_redirects", self.config.follow_redirects)

        # 添加代理配置
        if self.proxies and "proxies" not in kwargs:
            kwargs["proxies"] = self.proxies

        last_exception = None
        for attempt in range(self.config.max_retries):
            try:
                response = self.session.request(method, url, **kwargs)

                # 检查响应状态码
                if response.status_code >= 400:
                    logger.warning(
                        f"HTTP {response.status_code} for {method} {url}"
                        f" (attempt {attempt + 1}/{self.config.max_retries})"
                    )

                    # 如果是服务器错误，重试
                    if response.status_code >= 500 and attempt < self.config.max_retries - 1:
                        time.sleep(self.config.retry_delay * (attempt + 1))
                        continue

                return response

            except (cffi_requests.RequestsError, ConnectionError, TimeoutError) as e:
                last_exception = e
                logger.warning(
                    f"请求失败: {method} {url} (attempt {attempt + 1}/{self.config.max_retries}): {e}"
                )

                if attempt < self.config.max_retries - 1:
                    time.sleep(self.config.retry_delay * (attempt + 1))
                else:
                    break

        raise HTTPClientError(
            f"请求失败，最大重试次数已达: {method} {url} - {last_exception}"
        )

    def get(self, url: str, **kwargs) -> Response:
        """发送 GET 请求"""
        return self.request("GET", url, **kwargs)

    def post(self, url: str, data: Any = None, json: Any = None, **kwargs) -> Response:
        """发送 POST 请求"""
        return self.request("POST", url, data=data, json=json, **kwargs)

    def put(self, url: str, data: Any = None, json: Any = None, **kwargs) -> Response:
        """发送 PUT 请求"""
        return self.request("PUT", url, data=data, json=json, **kwargs)

    def delete(self, url: str, **kwargs) -> Response:
        """发送 DELETE 请求"""
        return self.request("DELETE", url, **kwargs)

    def head(self, url: str, **kwargs) -> Response:
        """发送 HEAD 请求"""
        return self.request("HEAD", url, **kwargs)

    def options(self, url: str, **kwargs) -> Response:
        """发送 OPTIONS 请求"""
        return self.request("OPTIONS", url, **kwargs)

    def patch(self, url: str, data: Any = None, json: Any = None, **kwargs) -> Response:
        """发送 PATCH 请求"""
        return self.request("PATCH", url, data=data, json=json, **kwargs)

    def download_file(self, url: str, filepath: str, chunk_size: int = 8192) -> None:
        """
        下载文件

        Args:
            url: 文件 URL
            filepath: 保存路径
            chunk_size: 块大小

        Raises:
            HTTPClientError: 下载失败
        """
        try:
            response = self.get(url, stream=True)
            response.raise_for_status()

            with open(filepath, 'wb') as f:
                for chunk in response.iter_content(chunk_size=chunk_size):
                    if chunk:
                        f.write(chunk)

        except Exception as e:
            raise HTTPClientError(f"下载文件失败: {url} - {e}")

    def check_proxy(self, test_url: str = "https://httpbin.org/ip") -> bool:
        """
        检查代理是否可用

        Args:
            test_url: 测试 URL

        Returns:
            bool: 代理是否可用
        """
        if not self.proxy_url:
            return False

        try:
            response = self.get(test_url, timeout=10)
            return response.status_code == 200
        except Exception:
            return False

    def close(self):
        """关闭会话"""
        if self._session:
            self._session.close()
            self._session = None

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.close()