import json
import httpx
from typing import Optional, Dict, Any, Union
from mooc.core.config import settings
import asyncio
import time
import logging
import os

logger = logging.getLogger(__name__)

class WeChatAPI:
    def __init__(self, appid: str = None, appsecret: str = None):
        self.appid = appid or settings.WECHAT_APPID
        self.appsecret = appsecret or settings.WECHAT_APPSECRET
        self._access_token = ""
        self.timeout = 10.0  # 设置10秒超时
        self.max_retries = 3  # 最大重试次数

    async def _get(self, url: str) -> Dict[str, Any]:
        """带重试功能的GET请求"""
        retry_count = 0
        last_error = None
        
        while retry_count < self.max_retries:
            try:
                logger.info(f"请求微信API: {url}")
                async with httpx.AsyncClient(verify=False, timeout=self.timeout) as client:
                    response = await client.get(url)
                    logger.info(f"微信API响应: {response.status_code}")
                    return response.json()
            except (httpx.ConnectTimeout, httpx.ReadTimeout) as e:
                retry_count += 1
                last_error = e
                logger.warning(f"请求微信API超时，第{retry_count}次重试: {str(e)}")
                if retry_count < self.max_retries:
                    # 等待一段时间再重试，使用指数退避策略
                    await asyncio.sleep(1 * (2 ** (retry_count - 1)))
        
        # 所有重试都失败
        logger.error(f"请求微信API失败，已重试{self.max_retries}次: {str(last_error)}")
        
        # 如果开发模式已启用，则返回模拟数据
        if hasattr(settings, 'DEV_MODE') and settings.DEV_MODE:
            # 返回模拟数据
            logger.info("使用模拟数据替代微信API响应")
            if 'jscode2session' in url:
                return {
                    "openid": f"test_openid_{int(time.time())}",
                    "session_key": "test_session_key",
                    "unionid": f"test_unionid_{int(time.time())}"
                }
            elif 'token' in url:
                return {"access_token": "test_access_token", "expires_in": 7200}
        
        # 如果没有开发模式或者不是可以模拟的API，则抛出异常
        raise last_error

    async def _post(self, url: str, data: Dict[str, Any]) -> Dict[str, Any]:
        """带重试功能的POST请求"""
        retry_count = 0
        last_error = None
        
        while retry_count < self.max_retries:
            try:
                logger.info(f"POST请求微信API: {url}")
                async with httpx.AsyncClient(verify=False, timeout=self.timeout) as client:
                    response = await client.post(url, json=data)
                    logger.info(f"微信API响应: {response.status_code}")
                    return response.json()
            except (httpx.ConnectTimeout, httpx.ReadTimeout) as e:
                retry_count += 1
                last_error = e
                logger.warning(f"POST请求微信API超时，第{retry_count}次重试: {str(e)}")
                if retry_count < self.max_retries:
                    await asyncio.sleep(1 * (2 ** (retry_count - 1)))
        
        logger.error(f"POST请求微信API失败，已重试{self.max_retries}次: {str(last_error)}")
        raise last_error

    async def get_access_token(self) -> str:
        """获取access token"""
        url = f"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={self.appid}&secret={self.appsecret}"
        result = await self._get(url)
        if "access_token" in result:
            self._access_token = result["access_token"]
            return self._access_token
        raise Exception(f"Failed to get access token: {result}")

    async def code2session(self, code: str) -> Dict[str, Any]:
        """小程序登录凭证校验"""
        url = f"https://api.weixin.qq.com/sns/jscode2session?appid={self.appid}&secret={self.appsecret}&js_code={code}&grant_type=authorization_code"
        result = await self._get(url)
        if "errcode" in result and result["errcode"] != 0:
            raise Exception(f"Code2Session failed: {result['errmsg']}，code:{code}")
        return result

    async def get_unlimited_qrcode(self, scene: str, access_token: str = None) -> bytes:
        """获取小程序码"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={access_token}"
        data = {"scene": scene}
        async with httpx.AsyncClient() as client:
            response = await client.post(url, json=data, verify=False)
            return response.content

    async def send_template_message(self, data: Dict[str, Any], access_token: str = None) -> Dict[str, Any]:
        """发送订阅消息"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token={access_token}"
        return await self._post(url, data)

    async def get_callback_ip(self, access_token: str = None) -> Dict[str, Any]:
        """获取微信服务器IP地址"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token={access_token}"
        return await self._get(url)

    async def check_callback(self, access_token: str = None, action: str = "all") -> Dict[str, Any]:
        """检查回调配置"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/cgi-bin/callback/check?access_token={access_token}"
        data = {"action": action, "check_operator": "DEFAULT"}
        return await self._post(url, data)

    async def create_menu(self, menu_data: Dict[str, Any], access_token: str = None) -> Dict[str, Any]:
        """创建自定义菜单"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/cgi-bin/menu/create?access_token={access_token}"
        return await self._post(url, menu_data)

    async def get_menu(self, access_token: str = None) -> Dict[str, Any]:
        """获取自定义菜单"""
        if not access_token:
            access_token = await self.get_access_token()
        url = f"https://api.weixin.qq.com/cgi-bin/menu/get?access_token={access_token}"
        return await self._get(url)

    def get_oauth_url(self, redirect_uri: str, scope: str, state: str = "") -> str:
        """生成网页授权URL"""
        url = (f"https://open.weixin.qq.com/connect/oauth2/authorize?"
               f"appid={self.appid}&redirect_uri={redirect_uri}&response_type=code&"
               f"scope={scope}#wechat_redirect")
        if state:
            url += f"&state={state}"
        return url

    async def get_user_token(self, code: str) -> Dict[str, Any]:
        """获取用户访问令牌"""
        url = (f"https://api.weixin.qq.com/sns/oauth2/access_token?"
               f"appid={self.appid}&secret={self.appsecret}&code={code}&"
               f"grant_type=authorization_code")
        result = await self._get(url)
        if "access_token" not in result:
            return {"code": 4001, "message": "获取用户授权失败"}
        return result

    async def refresh_token(self, refresh_token: str) -> Dict[str, Any]:
        """刷新访问令牌"""
        url = (f"https://api.weixin.qq.com/sns/oauth2/refresh_token?"
               f"appid={self.appid}&grant_type=refresh_token&refresh_token={refresh_token}")
        return await self._get(url)

    async def check_user_token(self, access_token: str, openid: str) -> bool:
        """检查用户访问令牌是否有效"""
        url = f"https://api.weixin.qq.com/sns/auth?access_token={access_token}&openid={openid}"
        result = await self._get(url)
        return result.get("errcode", -1) == 0

    async def get_user_info(self, access_token: str, openid: str, 
                           refresh_token: str = "") -> Dict[str, Any]:
        """获取用户信息"""
        if await self.check_user_token(access_token, openid):
            url = (f"https://api.weixin.qq.com/sns/userinfo?"
                  f"access_token={access_token}&openid={openid}&lang=zh_CN")
            return await self._get(url)
        elif refresh_token:
            result = await self.refresh_token(refresh_token)
            new_token = result.get("access_token")
            if new_token:
                return await self.get_user_info(new_token, openid)
        return {"code": 4002, "message": "获取用户详细信息失败，请重新获取code"}

    async def save_unlimited_qrcode(self, uid: Union[str, int], 
                                 path: str, filename: str, 
                                 access_token: str = None) -> bool:
        """生成并保存小程序码到文件"""
        if not access_token:
            access_token = await self.get_access_token()
        
        url = f"https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={access_token}"
        data = {"scene": f"uid={uid}"}
        
        retry_count = 0
        last_error = None
        
        while retry_count < self.max_retries:
            try:
                async with httpx.AsyncClient(verify=False, timeout=self.timeout) as client:
                    response = await client.post(url, json=data)
                    if response.status_code == 200:
                        # 确保目录存在
                        os.makedirs(os.path.dirname(f"{path}{filename}"), exist_ok=True)
                        
                        full_path = f"{path}{filename}"
                        with open(full_path, 'wb') as f:
                            f.write(response.content)
                        return True
            except Exception as e:
                retry_count += 1
                last_error = e
                logger.warning(f"生成二维码失败，第{retry_count}次重试: {str(e)}")
                if retry_count < self.max_retries:
                    await asyncio.sleep(1 * (2 ** (retry_count - 1)))
        
        logger.error(f"生成二维码失败，已重试{self.max_retries}次: {str(last_error)}")
        return False

wx_api = WeChatAPI()