import asyncio
import json
from typing import Optional, Dict, Any
import aiohttp

from core.utils.log.logger_manager import LoggerManager


class AsyncRequestClient:
    """
    异步HTTP请求客户端，支持重试机制和详细日志记录

    特性:
    - 请求失败自动重试（网络错误和业务逻辑错误）
    - 指数退避重试策略
    - 本地日志和阿里云日志双重记录
    - 可配置的重试参数和超时设置
    """

    class BusinessLogicError(Exception):
        """业务逻辑错误异常"""
        pass

    def __init__(
            self,
            logger: Optional[Any] = None,
            aliyun_log: Optional[Any] = None,
            max_retries: int = 3,
            base_delay: float = 1.0,
            timeout: int = 30
    ):
        """
        初始化请求客户端

        Args:
            logger: 本地日志记录器实例
            aliyun_log: 阿里云日志记录器实例
            max_retries: 最大重试次数
            base_delay: 基础等待时间(秒)，用于指数退避计算
            timeout: 请求超时时间(秒)
        """
        self.logger = logger
        self.aliyun_log = aliyun_log
        self.max_retries = max_retries
        self.base_delay = base_delay
        self.timeout = timeout

    async def request(
            self,
            session: aiohttp.ClientSession,
            method: str,
            url: str,
            **kwargs
    ) -> Optional[Dict]:
        """
        发送HTTP请求，支持重试机制

        Args:
            session: aiohttp会话对象
            method: HTTP方法(GET, POST等)
            url: 请求URL
            **kwargs: 其他请求参数

        Returns:
            Optional[Dict]: 响应数据(JSON格式)，失败时返回None
        """
        retries = 0
        last_error = None

        # 记录请求开始
        self._log_request_start(method, url, kwargs)

        while retries <= self.max_retries:
            try:
                # 计算等待时间(指数退避)
                if retries > 0:
                    delay = self.base_delay * (2 ** (retries - 1))
                    self._log_retry_delay(retries, delay)
                    await asyncio.sleep(delay)

                # 发送请求
                async with session.request(
                        method, url,
                        timeout=aiohttp.ClientTimeout(total=self.timeout),
                        **kwargs
                ) as response:
                    # 检查HTTP状态
                    response.raise_for_status()

                    # 解析响应
                    resp_data = await response.json()

                    # 检查业务状态码
                    if resp_data.get('code') != 0:
                        raise self.BusinessLogicError(
                            f"业务逻辑错误: code={resp_data.get('code')}"
                        )

                    # 记录成功响应
                    self._log_success_response(url, resp_data)
                    return resp_data

            except (aiohttp.ClientError, asyncio.TimeoutError) as e:
                last_error = e
                retries += 1
                self._log_network_error(e, retries, url)

            except self.BusinessLogicError as e:
                last_error = e
                retries += 1
                self._log_business_error(e, retries, url)

            except Exception as e:
                last_error = e
                retries += 1
                self._log_unexpected_error(e, retries, url)

        # 所有重试都失败
        self._log_final_failure(method, url, kwargs, last_error)
        return None

    def _log_request_start(self, method: str, url: str, kwargs: Dict):
        """记录请求开始"""
        if self.logger:
            # 简化日志，避免记录过大请求体
            # log_data = {k: v for k, v in kwargs.items() if k != 'json' and k != 'data'}
            # if 'json' in kwargs:
            #     log_data['json'] = '[...]'  # 简化JSON内容
            self.logger.info(f"请求 {method} {url}, 参数: {kwargs}")

        if self.aliyun_log:
            self.aliyun_log.logging(
                code="1012",
                message="初始化请求",
                data={
                    "url": url,
                    "method": method,
                    "requestBody": {k: v for k, v in kwargs.items() if k != 'json'}
                }
            )

    def _log_retry_delay(self, retries: int, delay: float):
        """记录重试等待"""
        if self.logger:
            self.logger.info(f"第 {retries} 次重试，等待 {delay:.2f} 秒")

    def _log_network_error(self, error: Exception, retries: int, url: str):
        """记录网络错误"""
        if self.logger:
            self.logger.warning(
                f"请求 {url} 网络错误({retries}/{self.max_retries}): {error}"
            )

    def _log_business_error(self, error: Exception, retries: int, url: str):
        """记录业务逻辑错误"""
        if self.logger:
            self.logger.warning(
                f"请求 {url} 业务逻辑错误({retries}/{self.max_retries}): {error}"
            )

    def _log_unexpected_error(self, error: Exception, retries: int, url: str):
        """记录未预期错误"""
        if self.logger:
            self.logger.error(
                f"请求 {url} 未预期错误({retries}/{self.max_retries}): {error}"
            )

    def _log_success_response(self, url: str, response: Dict):
        """记录成功响应"""
        if self.logger:
            # 只记录关键信息，避免日志过大
            self.logger.info(f"请求 {url} 成功: code={response.get('code')}")

    def _log_final_failure(self, method: str, url: str, kwargs: Dict, error: Exception):
        """记录最终失败"""
        error_msg = f"请求 {method} {url} 最终失败: {error}"

        if self.logger:
            self.logger.error(error_msg)

        if self.aliyun_log:
            self.aliyun_log.logging(
                code="9006",
                message=error_msg,
                data={
                    "url": url,
                    "method": method,
                    "requestBody": {k: v for k, v in kwargs.items() if k != 'json'},
                    "error_type": type(error).__name__,
                    "error_message": str(error)
                }
            )