import os
import json
import uuid
import base64
import pickle
import logging
import traceback  # 确保导入traceback模块
from pathlib import Path
import dateutil.parser as parser
from datetime import datetime
from bs4 import BeautifulSoup
from django.utils import timezone
from django.conf import settings  # 添加Django设置导入
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
import warnings
import mimetypes

# 忽略oauth2client相关的所有警告
warnings.filterwarnings('ignore', message='file_cache is unavailable when using oauth2client >= 4.0.0 or google-auth')
warnings.filterwarnings('ignore', category=DeprecationWarning, module='oauth2client')
warnings.filterwarnings('ignore', message='.*google-auth.*')
warnings.filterwarnings('ignore', message='.*oauth2client.*')

from apiclient import discovery
from httplib2 import Http
from oauth2client import file, client, tools

from .models import GmailCredential, KnowledgeBase, KnowledgeBaseDocument, User, GmailTalentMapping, ChatHistory, GmailAttachment

logger = logging.getLogger(__name__)

# Gmail服务单例管理器
class GmailServiceManager:
    _instances = {}  # 以用户ID为键存储Gmail服务实例
    
    @classmethod
    def get_instance(cls, user):
        """获取用户的Gmail服务实例，如果不存在则创建"""
        user_id = str(user.id)
        
        if user_id not in cls._instances:
            try:
                # 从数据库获取认证信息
                credential = GmailCredential.objects.filter(user=user, is_active=True).first()
                
                if credential and credential.credentials:
                    # 反序列化凭证
                    creds = pickle.loads(credential.credentials)
                    
                    # 检查凭证是否有效
                    if not creds.invalid:
                        # 初始化服务
                        gmail_service = discovery.build('gmail', 'v1', http=creds.authorize(Http()))
                        
                        # 存储实例
                        cls._instances[user_id] = {
                            'service': gmail_service,
                            'credentials': creds,
                            'timestamp': timezone.now(),
                            'user': user
                        }
                        
                        logger.info(f"创建用户 {user.username} 的Gmail服务单例")
                        return cls._instances[user_id]
            except Exception as e:
                logger.error(f"创建Gmail服务单例失败: {e}")
        else:
            # 检查实例是否过期(超过30分钟)
            instance = cls._instances[user_id]
            time_diff = timezone.now() - instance['timestamp']
            
            if time_diff.total_seconds() > 1800:  # 30分钟过期
                del cls._instances[user_id]
                return cls.get_instance(user)  # 递归调用，重新创建
                
            # 更新时间戳
            cls._instances[user_id]['timestamp'] = timezone.now()
            logger.info(f"复用用户 {user.username} 的Gmail服务单例")
            return cls._instances[user_id]
        
        return None
    
    @classmethod
    def update_instance(cls, user, credentials, service):
        """更新用户的Gmail服务实例"""
        user_id = str(user.id)
        cls._instances[user_id] = {
            'service': service,
            'credentials': credentials,
            'timestamp': timezone.now(),
            'user': user
        }
        
    @classmethod
    def clear_instance(cls, user):
        """清除用户的Gmail服务实例"""
        user_id = str(user.id)
        if user_id in cls._instances:
            del cls._instances[user_id]

class GmailIntegration:
    """Gmail集成类"""
    
    # Gmail API 权限范围
    SCOPES = ['https://mail.google.com/']
    
    def __init__(self, user, email=None, client_secret_json=None, use_proxy=True, proxy_url='http://127.0.0.1:7890'):
        self.user = user
        self.user_email = user.email if user else None
        self.email = email  # 目标邮箱
        self.client_secret = client_secret_json
        self.credentials = None
        self.gmail_service = None
        self.use_proxy = use_proxy
        self.proxy_url = proxy_url
        
        # 设置代理
        if self.use_proxy:
            logger.info(f"设置Gmail API代理: {proxy_url}")
            os.environ['HTTP_PROXY'] = proxy_url
            os.environ['HTTPS_PROXY'] = proxy_url
        
        # 设置Token文件存储路径
        if user:
            # 使用用户ID创建唯一的token存储路径
            token_file = f"gmail_token_{user.id}.json"
            self.token_storage_path = os.path.join("gmail_tokens", token_file)
            
            # 确保目录存在
            os.makedirs("gmail_tokens", exist_ok=True)
            logger.info(f"设置Token存储路径: {self.token_storage_path}")
            
            # 尝试从数据库加载凭证
            try:
                gmail_cred = GmailCredential.objects.filter(user=user, is_active=True).first()
                if gmail_cred and gmail_cred.credentials:
                    logger.info(f"从数据库加载用户 {user.username} 的Gmail凭证")
                    self.credentials = pickle.loads(gmail_cred.credentials)
                    
                    # 初始化Gmail服务
                    self.gmail_service = discovery.build('gmail', 'v1', http=self.credentials.authorize(Http()))
                    logger.info("从数据库凭证初始化Gmail服务成功")
            except Exception as e:
                logger.error(f"从数据库加载凭证失败: {str(e)}")
                # 继续使用文件方式                
        else:
            self.token_storage_path = "gmail_token.json"
            logger.warning("未提供用户，将使用默认Token存储路径")
        
        # 存储对象
        self.storage = file.Storage(self.token_storage_path)
        
    def authenticate(self):
        """获取Gmail API凭证并认证"""
        try:
            # 优先尝试使用单例服务
            if self.user:
                instance = GmailServiceManager.get_instance(self.user)
                if instance:
                    self.gmail_service = instance['service']
                    self.credentials = instance['credentials']
                    logger.info("使用现有的Gmail服务单例")
                    return True
            
            # 以下是原有的认证逻辑...
            # 写入client_secret.json
            if self.client_secret:
                client_secret_path = 'client_secret.json'
                with open(client_secret_path, 'w') as f:
                    if isinstance(self.client_secret, str):
                        try:
                            # 确保是有效的JSON
                            json_data = json.loads(self.client_secret)
                            json.dump(json_data, f)
                        except json.JSONDecodeError as e:
                            logger.error(f"client_secret不是有效的JSON: {str(e)}")
                            return False
                    else:
                        json.dump(self.client_secret, f)
                
                logger.info(f"已将client_secret写入临时文件: {client_secret_path}")

            # 使用与quickstart.py相同的流程
            logger.info(f"创建或读取token存储: {self.token_storage_path}")
            
            # 确保token目录存在
            token_dir = os.path.dirname(self.token_storage_path)
            if token_dir and not os.path.exists(token_dir):
                logger.info(f"创建token目录: {token_dir}")
                os.makedirs(token_dir)
                
            store = file.Storage(self.token_storage_path)
            creds = store.get()
            
            if not creds or creds.invalid:
                logger.info("没有有效的凭证，需要重新授权")
                if not self.client_secret:
                    logger.error("没有提供client_secret_json且找不到有效凭证")
                    return False
                
                # 提取重定向URI
                redirect_uri = None
                if isinstance(self.client_secret, dict):
                    for key in ['web', 'installed']:
                        if key in self.client_secret and 'redirect_uris' in self.client_secret[key]:
                            redirect_uri = self.client_secret[key]['redirect_uris'][0]
                            break
                elif isinstance(self.client_secret, str):
                    try:
                        json_data = json.loads(self.client_secret)
                        for key in ['web', 'installed']:
                            if key in json_data and 'redirect_uris' in json_data[key]:
                                redirect_uri = json_data[key]['redirect_uris'][0]
                                break
                    except:
                        pass
                
                # 如果找不到重定向URI，使用默认值
                if not redirect_uri or redirect_uri == 'urn:ietf:wg:oauth:2.0:oob':
                    logger.info("使用非浏览器认证模式")
                    redirect_uri = 'urn:ietf:wg:oauth:2.0:oob'
                    flow = client.flow_from_clientsecrets('client_secret.json', self.SCOPES)
                    flow.redirect_uri = redirect_uri
                else:
                    logger.info(f"使用重定向URI: {redirect_uri}")
                    flow = client.flow_from_clientsecrets('client_secret.json', self.SCOPES)
                    flow.redirect_uri = redirect_uri
                
                # 获取授权URL并抛出异常
                auth_url = flow.step1_get_authorize_url()
                logger.info(f"获取授权URL: {auth_url[:50]}...")
                raise Exception(f"Please visit this URL to authorize: {auth_url}")
                
            # 如果有有效凭证，初始化服务
            self.credentials = creds
            logger.info("使用现有凭证初始化Gmail服务")
            self.gmail_service = discovery.build('gmail', 'v1', http=creds.authorize(Http()))
            logger.info("Gmail服务初始化成功")
            
            # 获取Gmail账号信息
            gmail_email = None
            try:
                # 调用Gmail API获取用户资料
                profile = self.gmail_service.users().getProfile(userId='me').execute()
                gmail_email = profile.get('emailAddress')
                logger.info(f"获取到Gmail账号: {gmail_email}")
            except Exception as profile_error:
                logger.error(f"获取Gmail账号失败: {str(profile_error)}")
                
            # 即使获取Gmail账号失败，也要尝试获取消息以提取邮箱
            if not gmail_email:
                try:
                    # 尝试获取一条消息来提取邮箱
                    messages = self.gmail_service.users().messages().list(userId='me', maxResults=1).execute()
                    if 'messages' in messages and len(messages['messages']) > 0:
                        msg_id = messages['messages'][0]['id']
                        msg = self.gmail_service.users().messages().get(userId='me', id=msg_id).execute()
                        # 从消息中查找与当前用户匹配的邮箱
                        if 'payload' in msg and 'headers' in msg['payload']:
                            for header in msg['payload']['headers']:
                                if header['name'] in ['From', 'To', 'Cc', 'Bcc']:
                                    if '<' in header['value'] and '>' in header['value']:
                                        email = header['value'].split('<')[1].split('>')[0]
                                        # 如果找到一个邮箱就使用它
                                        if not gmail_email:
                                            gmail_email = email
                                            logger.info(f"从消息中提取到Gmail账号: {gmail_email}")
                except Exception as msg_error:
                    logger.error(f"尝试从消息中提取Gmail账号失败: {str(msg_error)}")
            
            # 保存凭证到数据库
            if self.user:
                from django.utils import timezone
                logger.info("保存凭证到数据库")
                
                # 将凭证对象序列化
                credentials_data = pickle.dumps(creds)
                
                # 更新或创建凭证记录，添加gmail_email字段
                gmail_credential, created = GmailCredential.objects.update_or_create(
                    user=self.user,
                    defaults={
                        'credentials': credentials_data,
                        'token_path': self.token_storage_path,
                        'gmail_email': gmail_email,  # 添加实际Gmail账号
                        'updated_at': timezone.now(),
                        'is_active': True
                    }
                )
                action = "创建" if created else "更新"
                logger.info(f"已{action}用户 {self.user.username} 的Gmail凭证记录，实际Gmail账号: {gmail_email}")
                
            # 认证成功后更新单例
            if self.user and self.gmail_service and self.credentials:
                GmailServiceManager.update_instance(self.user, self.credentials, self.gmail_service)
            
            return True
            
        except Exception as e:
            # 保留授权URL异常，视图层会处理
            if "Please visit this URL" in str(e):
                raise e
            logger.error(f"Gmail认证失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return False
        finally:
            # 清理client_secret.json文件
            if self.client_secret and os.path.exists('client_secret.json'):
                logger.info("删除临时client_secret文件")
                os.unlink('client_secret.json')

    def create_talent_knowledge_base(self, talent_email):
        """
        创建或获取与talent_email关联的知识库
        
        Args:
            talent_email (str): 达人Gmail邮箱地址
            
        Returns:
            tuple: (knowledge_base, created) - 知识库对象和是否新创建的标志
        """
        try:
            # 优先查找现有的关联关系
            mapping = GmailTalentMapping.objects.filter(
                user=self.user,
                talent_email=talent_email,
                is_active=True
            ).first()
            
            if mapping and mapping.knowledge_base:
                logger.info(f"找到现有的Gmail-达人映射: {talent_email} -> {mapping.knowledge_base.name}")
                return mapping.knowledge_base, False
                
            # 查找与该达人邮箱关联的知识库
            # 根据达人邮箱生成一个唯一的标识名称
            kb_name = f"Gmail-{talent_email.split('@')[0]}"
            
            # 检查该名称的知识库是否已存在
            existing_kb = KnowledgeBase.objects.filter(
                name=kb_name,
                user_id=self.user.id
            ).first()
            
            if existing_kb:
                logger.info(f"找到现有知识库: {kb_name}")
                
                # 创建映射关系
                GmailTalentMapping.objects.update_or_create(
                    user=self.user,
                    talent_email=talent_email,
                    defaults={
                        'knowledge_base': existing_kb,
                        'is_active': True
                    }
                )
                
                return existing_kb, False
            
            # 没有找到现有知识库，直接使用基本方法创建
            logger.info(f"使用基本方法创建知识库: {kb_name}")
            return self._create_knowledge_base_basic(talent_email)
                
        except Exception as e:
            logger.error(f"创建或获取Gmail-达人知识库失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            
            # 创建失败时，尝试使用基本方法创建
            logger.info("尝试使用基本方法创建知识库")
            return self._create_knowledge_base_basic(talent_email)

    def _create_knowledge_base_basic(self, talent_email):
        """
        使用基本方法创建知识库（当KnowledgeBaseViewSet创建失败时的后备方案）
        
        Args:
            talent_email (str): 达人Gmail邮箱地址
            
        Returns:
            tuple: (knowledge_base, created) - 知识库对象和是否新创建的标志
        """
        try:
            # 根据达人邮箱生成一个唯一的标识名称
            kb_name = f"Gmail-{talent_email.split('@')[0]}"
            
            # 检查该名称的知识库是否已存在
            existing_kb = KnowledgeBase.objects.filter(
                name=kb_name,
                user_id=self.user.id
            ).first()
            
            if existing_kb:
                logger.info(f"找到现有知识库: {kb_name}")
                
                # 创建映射关系
                GmailTalentMapping.objects.update_or_create(
                    user=self.user,
                    talent_email=talent_email,
                    defaults={
                        'knowledge_base': existing_kb,
                        'is_active': True
                    }
                )
                
                return existing_kb, False
            
            # 创建新知识库
            knowledge_base = KnowledgeBase.objects.create(
                name=kb_name,
                desc=f"与{talent_email}的Gmail邮件交流记录",
                type="private",
                user_id=self.user.id,
                documents=[]
            )
            
            # 创建外部知识库
            try:
                from .views import KnowledgeBaseViewSet
                kb_viewset = KnowledgeBaseViewSet()
                external_id = kb_viewset._create_external_dataset(knowledge_base)
                if external_id:
                    knowledge_base.external_id = external_id
                    knowledge_base.save()
                    logger.info(f"成功创建外部知识库: {external_id}")
            except Exception as e:
                logger.error(f"创建外部知识库失败: {str(e)}")
                # 继续执行，不影响基本功能
            
            # 创建映射关系
            GmailTalentMapping.objects.create(
                user=self.user,
                talent_email=talent_email,
                knowledge_base=knowledge_base,
                is_active=True
            )
            
            logger.info(f"成功创建新知识库: {kb_name}, ID: {knowledge_base.id}")
            return knowledge_base, True
            
        except Exception as e:
            logger.error(f"创建或获取Gmail-达人知识库基本方法失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            raise

    def get_conversations(self, talent_gmail):
        """获取与特定用户的所有邮件对话"""
        try:
            if not self.gmail_service:
                logger.error("Gmail服务未初始化")
                return []
                
            # 使用crushwds@gmail.com作为固定邮箱
            email1 = "crushwds@gmail.com"  # 固定设置为quickstart.py中的邮箱
            email2 = talent_gmail  # 使用参数传入的目标邮箱
            
            logger.info(f"执行Gmail查询: {email1} 与 {email2}")
            
            # 构建搜索查询
            query = f"from:({email1} OR {email2}) to:({email1} OR {email2})"
            
            # 获取所有匹配的邮件
            response = self.gmail_service.users().messages().list(userId='me', q=query).execute()
            messages = []
            
            if 'messages' in response:
                messages.extend(response['messages'])
                message_count = len(messages)
                logger.info(f"找到 {message_count} 封邮件")
                
                # 分页获取所有邮件
                while 'nextPageToken' in response:
                    page_token = response['nextPageToken']
                    response = self.gmail_service.users().messages().list(
                        userId='me',
                        q=query,
                        pageToken=page_token
                    ).execute()
                    if 'messages' in response:
                        new_messages = response['messages']
                        messages.extend(new_messages)
                        new_count = len(new_messages)
                        message_count += new_count
                        logger.info(f"加载额外 {new_count} 封邮件，当前总数: {message_count}")
            else:
                logger.warning(f"未找到匹配邮件")
            
            # 处理每封邮件
            conversations = []
            if messages:
                logger.info(f"开始获取 {len(messages)} 封邮件详情...")
                
                for i, msg in enumerate(messages):
                    try:
                        message = self.gmail_service.users().messages().get(userId='me', id=msg['id']).execute()
                        email_data = self._extract_email_content(message)
                        if email_data:
                            conversations.append(email_data)
                            if (i+1) % 5 == 0 or i+1 == len(messages):  # 每5封邮件或最后一封邮件时记录进度
                                logger.info(f"已处理 {i+1}/{len(messages)} 封邮件")
                        else:
                            logger.warning(f"邮件 {i+1}/{len(messages)} 内容提取失败")
                    except Exception as e:
                        logger.error(f"获取邮件 {msg['id']} 详情失败: {str(e)}")
            
            # 按时间排序
            conversations.sort(key=lambda x: x['date'])
            
            logger.info(f"总共找到并解析了 {len(conversations)} 封邮件")
            return conversations
            
        except Exception as e:
            logger.error(f"获取Gmail对话失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return []

    def _extract_email_content(self, message):
        """提取邮件内容，完全按照quickstart.py的get_email_content函数实现"""
        try:
            message_id = message['id']  # 获取邮件ID
            payload = message['payload']
            headers = payload['headers']
            
            # 获取邮件基本信息
            email_data = {
                'id': message_id,  # 保存邮件ID
                'subject': '',
                'from': '',
                'date': '',
                'body': '',
                'attachments': []  # 新增附件列表
            }
            
            # 提取头部信息
            for header in headers:
                if header['name'] == 'Subject':
                    email_data['subject'] = header['value']
                elif header['name'] == 'From':
                    email_data['from'] = header['value']
                elif header['name'] == 'Date':
                    try:
                        date = parser.parse(header['value'])
                        # 转换为与Django时区一致的格式
                        if hasattr(settings, 'USE_TZ') and settings.USE_TZ:
                            date = timezone.make_aware(date)
                        email_data['date'] = date.strftime('%Y-%m-%d %H:%M:%S')
                    except Exception as e:
                        logger.error(f"解析日期失败: {str(e)}")
                        email_data['date'] = header['value']
            
            # 定义一个递归函数来处理所有部分和附件
            def process_parts(parts):
                for part in parts:
                    # 检查是否是附件
                    if 'filename' in part and part['filename']:
                        attachment = {
                            'filename': part['filename'],
                            'mimeType': part['mimeType'],
                            'size': part['body'].get('size', 0)
                        }
                        
                        # 如果有附件内容数据，可以获取附件ID
                        if 'attachmentId' in part['body']:
                            attachment['attachmentId'] = part['body']['attachmentId']
                        
                        email_data['attachments'].append(attachment)
                    
                    # 处理文本内容
                    if part['mimeType'] == 'text/plain' and not email_data['body']:
                        data = part['body'].get('data', '')
                        if data:
                            try:
                                text = base64.urlsafe_b64decode(data).decode('utf-8')
                                email_data['body'] = text
                            except Exception as e:
                                logger.error(f"解码邮件内容失败: {str(e)}")
                    
                    # 递归处理多部分内容
                    if 'parts' in part:
                        process_parts(part['parts'])
            
            # 处理邮件正文和附件
            if 'parts' in payload:
                process_parts(payload['parts'])
            elif 'body' in payload and 'data' in payload['body']:
                # 没有parts，直接处理body
                data = payload['body'].get('data', '')
                if data:
                    try:
                        text = base64.urlsafe_b64decode(data).decode('utf-8')
                        email_data['body'] = text
                    except Exception as e:
                        logger.error(f"解码邮件内容失败: {str(e)}")
            
            return email_data
            
        except Exception as e:
            logger.error(f"处理邮件内容时出错: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return None

    def download_attachment(self, message_id, attachment_id, filename):
        """下载邮件附件"""
        try:
            attachment = self.gmail_service.users().messages().attachments().get(
                userId='me', messageId=message_id, id=attachment_id
            ).execute()
            
            data = attachment['data']
            file_data = base64.urlsafe_b64decode(data)
            
            # 创建附件目录
            attachments_dir = 'gmail_attachments'
            if not os.path.exists(attachments_dir):
                os.makedirs(attachments_dir)
                
            # 保存附件
            filepath = os.path.join(attachments_dir, f"{message_id}_{filename}")
            with open(filepath, 'wb') as f:
                f.write(file_data)
                
            return filepath
        except Exception as e:
            logger.error(f"下载附件失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return None

    def save_conversations_to_knowledge_base(self, conversations, knowledge_base):
        """
        将Gmail对话保存到知识库
        
        Args:
            conversations: Gmail邮件列表
            knowledge_base: 保存到的知识库对象
        """
        try:
            # 导入所需模型
            from .models import GmailAttachment, ChatHistory
            
            # 检查入参
            if not conversations or not knowledge_base:
                logger.error("参数不完整: conversations或knowledge_base为空")
                return False
            
            if not conversations:
                logger.warning("没有邮件对话可保存")
                return {"conversation_id": None, "success": False, "error": "没有邮件对话可保存"}
            
            # 查找现有的对话ID - 优先使用talent_email查找
            conversation_id = None
            
            # 1. 首先尝试通过talent_email查找现有映射
            if self.email:
                existing_mapping = GmailTalentMapping.objects.filter(
                    user=self.user,
                    talent_email=self.email,
                    knowledge_base=knowledge_base,
                    is_active=True
                ).first()
                
                if existing_mapping and existing_mapping.conversation_id:
                    conversation_id = existing_mapping.conversation_id
                    logger.info(f"通过达人邮箱 {self.email} 找到现有对话ID: {conversation_id}")
            
            # 2. 如果上面没找到，尝试通过知识库查找任何相关的对话
            if not conversation_id:
                existing_conversation = ChatHistory.objects.filter(
                    knowledge_base=knowledge_base,
                    user=self.user,
                    is_deleted=False
                ).values('conversation_id').distinct().first()
                
                if existing_conversation:
                    conversation_id = existing_conversation['conversation_id']
                    logger.info(f"通过知识库 {knowledge_base.name} 找到现有对话ID: {conversation_id}")
                    
                    # 如果有talent_email，更新或创建映射关系
                    if self.email:
                        GmailTalentMapping.objects.update_or_create(
                            user=self.user,
                            talent_email=self.email,
                            defaults={
                                'knowledge_base': knowledge_base,
                                'conversation_id': conversation_id,
                                'is_active': True
                            }
                        )
                        logger.info(f"更新Gmail达人映射: {self.email} -> 对话ID {conversation_id}")
            
            # 3. 如果仍然没找到，则创建新的对话ID
            if not conversation_id:
                # 生成唯一的对话ID
                conversation_id = str(uuid.uuid4())
                logger.info(f"创建新的对话ID: {conversation_id}")
                
                # 创建或更新Gmail和达人的映射关系
                if self.email:
                    talent_mapping, created = GmailTalentMapping.objects.update_or_create(
                        user=self.user,
                        talent_email=self.email,
                        defaults={
                            'knowledge_base': knowledge_base,
                            'conversation_id': conversation_id,
                            'is_active': True
                        }
                    )
                    action = "创建" if created else "更新"
                    logger.info(f"已{action}Gmail达人映射: {self.email} -> {knowledge_base.name}")
            
            # 构建知识库文档
            logger.info(f"开始构建知识库文档，共{len(conversations)}个邮件对话")
            document = {
                "title": f"与{self.email or '联系人'}的Gmail邮件对话",
                "url": "",
                "source_type": "gmail",
                "paragraphs": []
            }
            
            # 对话按时间顺序排序
            conversations.sort(key=lambda x: x.get('date', ''))
            
            # 将对话添加到文档
            previous_message_dict = {}  # 用于存储邮件时间与消息ID的映射，以便找到正确的parent_id
            
            # 首先查找现有的聊天记录
            existing_messages = ChatHistory.objects.filter(
                conversation_id=conversation_id,
                is_deleted=False
            ).order_by('created_at')
            
            # 如果已有消息，跳过重复导入
            existing_gmail_ids = set()
            if existing_messages.exists():
                for msg in existing_messages:
                    if msg.metadata and 'gmail_message_id' in msg.metadata:
                        existing_gmail_ids.add(msg.metadata['gmail_message_id'])
                logger.info(f"发现已存在 {len(existing_gmail_ids)} 条消息记录，将跳过重复导入")
            
            for message in conversations:
                try:
                    # 跳过已导入的消息
                    if message.get('id') in existing_gmail_ids:
                        logger.info(f"跳过已导入的消息: {message.get('id')}")
                        continue
                    
                    # 提取邮件内容
                    sender = message.get('from', '未知发件人')
                    date_str = message.get('date', '未知时间')
                    subject = message.get('subject', '无主题')
                    body = message.get('body', '').strip()
                    
                    logger.info(f"处理邮件: {date_str}, {sender}, {subject[:20]}...")
                    
                    # 判断角色
                    # 从发件人地址中提取邮箱部分
                    sender_email = ''
                    if '<' in sender and '>' in sender:
                        # 格式如 "姓名 <email@example.com>"
                        sender_email = sender.split('<')[1].split('>')[0]
                    else:
                        # 格式可能直接是邮箱
                        sender_email = sender
                    
                    # 根据邮箱判断角色：检查发件人与用户邮箱或者目标邮箱是否匹配
                    is_user_email = self.user.email.lower() == sender_email.lower()
                    
                    # 检查是否是目标邮箱（talent_email）
                    is_talent_email = False
                    if self.email and sender_email.lower() == self.email.lower():
                        is_talent_email = True
                    
                    # 如果是用户邮箱或目标邮箱，则为user角色，否则为assistant
                    role = 'user' if is_user_email or is_talent_email else 'assistant'
                    
                    logger.info(f"设置消息角色: {role}，发件人: {sender_email}，用户邮箱: {self.user.email}，目标邮箱: {self.email}")
                    
                    # 将邮件添加到文档
                    paragraph = {
                        "id": f"msg_{len(document['paragraphs']) + 1}",
                        "title": f"{date_str} - {sender} - {subject}",
                        "content": body,
                        "meta": {
                            "sender": sender,
                            "date": date_str,
                            "subject": subject,
                            "has_attachments": len(message.get('attachments', [])) > 0,
                            "message_id": message.get('id', '')
                        }
                    }
                    document['paragraphs'].append(paragraph)
                    
                    # 解析邮件日期为datetime对象
                    try:
                        date_obj = datetime.strptime(date_str, '%Y-%m-%d %H:%M:%S')
                    except ValueError:
                        # 如果解析失败，使用当前时间
                        logger.warning(f"无法解析邮件日期: {date_str}，使用当前时间")
                        date_obj = datetime.now()
                    
                    # 查找parent_id（查找日期早于当前邮件且最接近的消息）
                    parent_id = None
                    closest_date = None
                    
                    for d, mid in previous_message_dict.items():
                        if d < date_obj and (closest_date is None or d > closest_date):
                            closest_date = d
                            parent_id = mid
                    
                    # 保存消息到聊天历史，使用邮件实际日期
                    from django.utils import timezone
                    aware_date = timezone.make_aware(date_obj) if not timezone.is_aware(date_obj) else date_obj
                    
                    # 创建消息记录
                    chat_message = ChatHistory.objects.create(
                        user=self.user,
                        knowledge_base=knowledge_base,
                        conversation_id=conversation_id,
                        parent_id=parent_id,
                        role=role,
                        content=f"{subject}\n\n{body}",
                        metadata={
                            'gmail_message_id': message.get('id', ''),
                            'from': sender,
                            'date': date_str,
                            'subject': subject,
                            'dataset_id_list': [str(knowledge_base.id)],
                            'dataset_names': [knowledge_base.name]
                        },
                        created_at=aware_date  # 设置正确的创建时间
                    )
                    
                    # 更新previous_message_dict
                    previous_message_dict[date_obj] = str(chat_message.id)
                    
                    # 处理附件
                    attachments = message.get('attachments', [])
                    if attachments:
                        for attachment in attachments:
                            if 'attachmentId' in attachment and 'filename' in attachment:
                                try:
                                    # 下载附件
                                    filepath = self.download_attachment(
                                        message_id=message['id'],
                                        attachment_id=attachment['attachmentId'],
                                        filename=attachment['filename']
                                    )
                                    
                                    if filepath:
                                        # 记录附件信息
                                        GmailAttachment.objects.create(
                                            chat_message=chat_message,
                                            gmail_message_id=message['id'],
                                            filename=attachment['filename'],
                                            filepath=filepath,
                                            mimetype=attachment.get('mimeType', ''),
                                            filesize=attachment.get('size', 0)
                                        )
                                        logger.info(f"已保存附件: {attachment['filename']}")
                                except Exception as e:
                                    logger.error(f"保存附件失败: {str(e)}")
                                    import traceback
                                    logger.error(traceback.format_exc())
                    
                except Exception as e:
                    logger.error(f"处理邮件时出错: {str(e)}")
                    import traceback
                    logger.error(traceback.format_exc())
            
            # 将文档添加到知识库
            logger.info(f"将Gmail对话添加到知识库: {knowledge_base.name}")
            
            # 准备文档数据结构
            doc_data = {
                "name": f"Gmail对话与{self.email or '联系人'}.txt",
                "paragraphs": []
            }
            
            # 将所有对话转换为段落
            for paragraph in document['paragraphs']:
                doc_data["paragraphs"].append({
                    "title": paragraph['title'],
                    "content": paragraph['content'],
                    "is_active": True,
                    "problem_list": []
                })
            
            # 调用知识库的文档上传API
            from .views import KnowledgeBaseViewSet
            kb_viewset = KnowledgeBaseViewSet()
            
            # 上传文档
            upload_response = kb_viewset._call_upload_api(knowledge_base.external_id, doc_data)
            
            if upload_response and upload_response.get('code') == 200 and upload_response.get('data'):
                # 上传成功，保存记录到数据库
                document_id = upload_response['data']['id']
                
                # 创建文档记录
                from .models import KnowledgeBaseDocument
                doc_record = KnowledgeBaseDocument.objects.create(
                    knowledge_base=knowledge_base,
                    document_id=document_id,
                    document_name=doc_data["name"],
                    external_id=document_id
                )
                
                logger.info(f"Gmail对话文档上传成功，ID: {document_id}")
                
                # 上传所有附件
                self._upload_attachments_to_knowledge_base(knowledge_base, conversations)
            else:
                # 上传失败，记录错误信息
                error_msg = upload_response.get('message', '未知错误') if upload_response else '上传API调用失败'
                logger.error(f"Gmail对话文档上传失败: {error_msg}")
            
            # 更新知识库文档计数
            knowledge_base.document_count = KnowledgeBaseDocument.objects.filter(
                knowledge_base=knowledge_base,
                status='active'
            ).count()
            knowledge_base.save()
            
            logger.info(f"Gmail对话已保存到知识库: {knowledge_base.name}")
            
            return {
                "conversation_id": conversation_id,
                "success": True,
                "message_count": len(conversations),
                "knowledge_base_id": str(knowledge_base.id)
            }
            
        except Exception as e:
            logger.error(f"保存Gmail对话到知识库失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return {"conversation_id": None, "success": False, "error": str(e)}

    def send_email(self, to_email, subject, body, conversation_id=None, attachments=None):
        """发送邮件并保存到聊天记录"""
        try:
            # 构建邮件内容
            if attachments and len(attachments) > 0:
                message = self._create_message_with_attachment(to_email, subject, body, attachments)
            else:
                message = self._create_message(to_email, subject, body)
            
            # 发送邮件
            sent_message = self.gmail_service.users().messages().send(
                userId='me', body=message
            ).execute()
            
            message_id = sent_message['id']
            logger.info(f"邮件发送成功, ID: {message_id}")
            
            # 获取邮件详情，包括服务器时间戳
            try:
                message_detail = self.gmail_service.users().messages().get(
                    userId='me', id=message_id
                ).execute()
                
                # 从消息详情中提取时间戳
                internal_date = message_detail.get('internalDate')
                if internal_date:
                    # 转换毫秒时间戳为datetime，不使用timezone-aware
                    email_date = datetime.fromtimestamp(int(internal_date)/1000)
                    # 如果系统设置了USE_TZ，再转换为timezone-aware
                    if hasattr(timezone, 'is_aware') and not timezone.is_aware(email_date):
                        email_date = timezone.make_aware(email_date)
                    date_str = email_date.strftime('%Y-%m-%d %H:%M:%S')
                else:
                    email_date = datetime.now()
                    date_str = email_date.strftime('%Y-%m-%d %H:%M:%S')
            except Exception as e:
                logger.warning(f"获取邮件时间戳失败: {str(e)}, 使用当前时间")
                email_date = datetime.now()
                date_str = email_date.strftime('%Y-%m-%d %H:%M:%S')
            
            # 如果有conversation_id，保存到聊天记录
            if conversation_id:
                # 查找现有的聊天记录
                from django.db.models import Q
                existing_messages = ChatHistory.objects.filter(
                    conversation_id=conversation_id,
                    is_deleted=False
                ).order_by('created_at')
                
                if not existing_messages.exists():
                    logger.warning(f"找不到对话ID: {conversation_id}，无法保存消息")
                    return message_id
                
                # 查找关联的知识库
                first_message = existing_messages.first()
                if first_message.knowledge_base:
                    knowledge_base = first_message.knowledge_base
                else:
                    # 如果第一条消息没有知识库，尝试从metadata获取
                    if first_message.metadata and 'dataset_id_list' in first_message.metadata:
                        kb_id = first_message.metadata.get('dataset_id_list', [])[0]
                        knowledge_base = KnowledgeBase.objects.get(id=kb_id)
                    else:
                        logger.error(f"找不到关联的知识库，无法保存消息")
                        return message_id
                
                # 查找parent_id：时间早于当前邮件且最接近的消息，避免时区问题
                parent_id = None
                try:
                    # 使用简单查询，不依赖时区
                    previous_messages = ChatHistory.objects.filter(
                        conversation_id=conversation_id,
                        is_deleted=False
                    ).order_by('-id')[:1]  # 使用ID降序排序而非时间
                    
                    if previous_messages:
                        parent_id = str(previous_messages[0].id)
                except Exception as e:
                    logger.error(f"查找父消息失败: {str(e)}")
                    logger.error(traceback.format_exc())
                
                # 构建metadata
                metadata = {
                    'gmail_message_id': message_id,
                    'from': self.user.email,
                    'to': to_email,
                    'date': date_str,
                    'subject': subject,
                    'dataset_id_list': [str(knowledge_base.id)],
                    'dataset_names': [knowledge_base.name]
                }
                
                # 如果现有消息有dataset_id_list，保留它
                if first_message.metadata and 'dataset_id_list' in first_message.metadata:
                    metadata['dataset_id_list'] = first_message.metadata['dataset_id_list']
                    # 尝试获取对应的dataset_names
                    if 'dataset_names' in first_message.metadata:
                        metadata['dataset_names'] = first_message.metadata['dataset_names']
                
                # 创建聊天记录，使用当前时间而不是邮件的实际时间
                chat_message = ChatHistory.objects.create(
                    user=self.user,
                    knowledge_base=knowledge_base,
                    conversation_id=conversation_id,
                    parent_id=parent_id,
                    role='user',  # 用户发送的消息，角色固定为'user'
                    content=f"[{subject}] {body}",
                    metadata=metadata
                    # 不设置created_at，使用数据库默认时间
                )
                
                # 如果有附件，保存附件信息
                if attachments and len(attachments) > 0:
                    for att_path in attachments:
                        file_name = os.path.basename(att_path)
                        file_size = os.path.getsize(att_path)
                        
                        # 获取MIME类型
                        mime_type, _ = mimetypes.guess_type(att_path)
                        if not mime_type:
                            mime_type = 'application/octet-stream'
                        
                        # 保存附件信息到数据库
                        gmail_attachment = GmailAttachment.objects.create(
                            chat_message=chat_message,
                            gmail_message_id=message_id,
                            filename=file_name,
                            filepath=att_path,
                            mimetype=mime_type,
                            filesize=file_size
                        )
                
                # 更新知识库文档
                self._append_to_knowledge_base_document(knowledge_base, subject, body, to_email)
            
            return message_id
            
        except Exception as e:
            logger.error(f"发送邮件失败: {str(e)}")
            logger.error(traceback.format_exc())
            raise
            
    def _create_message(self, to, subject, body):
        """创建邮件消息"""
        message = MIMEText(body)
        message['to'] = to
        message['subject'] = subject
        
        # 编码为JSON安全的字符串
        raw = base64.urlsafe_b64encode(message.as_bytes()).decode()
        return {'raw': raw}
    
    def _create_message_with_attachment(self, to, subject, body, attachment_files):
        """创建带附件的邮件消息"""
        message = MIMEMultipart()
        message['to'] = to
        message['subject'] = subject
        
        # 添加邮件正文
        msg = MIMEText(body)
        message.attach(msg)
        
        # 添加附件
        for file in attachment_files:
            try:
                with open(file, 'rb') as f:
                    part = MIMEBase('application', 'octet-stream')
                    part.set_payload(f.read())
                
                # 编码附件内容
                encoders.encode_base64(part)
                
                # 添加头部信息
                filename = os.path.basename(file)
                part.add_header(
                    'Content-Disposition',
                    f'attachment; filename="{filename}"'
                )
                message.attach(part)
            except Exception as e:
                logger.error(f"添加附件 {file} 失败: {str(e)}")
        
        # 编码为JSON安全的字符串
        raw = base64.urlsafe_b64encode(message.as_bytes()).decode()
        return {'raw': raw}
    
    def _append_to_knowledge_base_document(self, knowledge_base, subject, body, recipient):
        """将新发送的邮件内容追加到知识库文档中"""
        try:
            # 准备文档数据结构
            doc_data = {
                "name": f"Gmail回复给{recipient}_{datetime.now().strftime('%Y%m%d%H%M%S')}.txt",
                "paragraphs": [
                    {
                        "title": f"{datetime.now().strftime('%Y-%m-%d %H:%M:%S')} - {subject}",
                        "content": f"发件人: {self.user.email}\n收件人: {recipient}\n\n{body}",
                        "is_active": True,
                        "problem_list": []
                    }
                ]
            }
            
            # 调用知识库的文档上传API
            from .views import KnowledgeBaseViewSet
            kb_viewset = KnowledgeBaseViewSet()
            
            # 验证知识库是否有external_id
            if not knowledge_base.external_id:
                logger.error(f"知识库没有external_id，无法上传文档: {knowledge_base.name}")
                return None
            
            # 上传文档
            upload_response = kb_viewset._call_upload_api(knowledge_base.external_id, doc_data)
            
            if upload_response and upload_response.get('code') == 200 and upload_response.get('data'):
                # 上传成功，保存记录到数据库
                document_id = upload_response['data']['id']
                
                # 创建文档记录
                from .models import KnowledgeBaseDocument
                doc_record = KnowledgeBaseDocument.objects.create(
                    knowledge_base=knowledge_base,
                    document_id=document_id,
                    document_name=doc_data["name"],
                    external_id=document_id
                )
                
                logger.info(f"Gmail回复文档上传成功，ID: {document_id}")
                
                # 更新知识库文档计数
                knowledge_base.document_count = KnowledgeBaseDocument.objects.filter(
                    knowledge_base=knowledge_base,
                    status='active'
                ).count()
                knowledge_base.save()
                
                return upload_response
            else:
                # 上传失败，记录错误信息
                error_msg = upload_response.get('message', '未知错误') if upload_response else '上传API调用失败'
                logger.error(f"Gmail回复文档上传失败: {error_msg}")
                return None
            
        except Exception as e:
            logger.error(f"追加邮件内容到知识库失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return None

    def setup_watch(self, topic_name=None):
        """设置Gmail监听"""
        try:
            # 如果没有指定topic，使用配置的主题名称
            if not topic_name:
                # 从settings获取项目配置的主题名称
                topic_name = getattr(settings, 'GMAIL_TOPIC_NAME', 'gmail-watch-topic')
            
            # 直接使用settings中配置的项目ID，不再从client_secret.json获取
            project_id = getattr(settings, 'GOOGLE_CLOUD_PROJECT', 'knowledge-454905')
            logger.info(f"使用settings中配置的项目ID: {project_id}")
            
            # 注意：不再使用用户邮箱作为判断依据，Gmail API总是使用'me'作为userId
            # Gmail认证是通过OAuth流程，与系统用户邮箱无关
            logger.info(f"系统用户: {self.user.email}，Gmail API使用OAuth认证的邮箱 (userId='me')")
            
            # 构建完整的webhook URL
            webhook_url = getattr(settings, 'GMAIL_WEBHOOK_URL', None)
            if not webhook_url:
                # 使用默认值，确保这是一个完全限定的URL
                domain = getattr(settings, 'ALLOWED_HOSTS', ['localhost'])[0]
                protocol = 'https' if getattr(settings, 'SECURE_SSL_REDIRECT', False) else 'http'
                if domain == 'localhost' or domain.startswith('127.0.0.1'):
                    # 本地开发环境需要公网可访问的URL，可以用ngrok等工具暴露本地服务
                    webhook_url = f"{protocol}://{domain}:8000/api/user/gmail/webhook/"
                    logger.warning("使用本地开发环境URL作为webhook回调，Google可能无法访问。建议使用ngrok等工具创建公网地址。")
                else:
                    webhook_url = f"{protocol}://{domain}/api/user/gmail/webhook/"
            
            logger.info(f"使用Gmail webhook URL: {webhook_url}")
            
            # 如果想在Google Cloud控制台中手动配置webhook，打印明确的说明
            logger.info("如需手动配置Gmail推送通知，请确保在Google Cloud控制台的Pub/Sub主题配置中设置以下URL:")
            logger.info(f"推送端点: {webhook_url}")
            logger.info("权限: 为Gmail API服务账号(gmail-api-push@system.gserviceaccount.com)和您的Gmail账号授予发布权限")
            
            # 请求监听
            request = {
                'labelIds': ['INBOX', 'SENT', 'IMPORTANT', 'UNREAD'],  # 监听更多标签
                'topicName': f"projects/{project_id}/topics/{topic_name}",
                'labelFilterAction': 'include'
            }
            
            logger.info(f"设置Gmail监听: {request}")
            
            # 执行watch请求
            response = self.gmail_service.users().watch(userId='me', body=request).execute()
            
            # 获取historyId，用于后续同步
            history_id = response.get('historyId')
            expiration = response.get('expiration')
            
            logger.info(f"Gmail监听设置成功: historyId={history_id}, expiration={expiration}")
            
            # 保存监听信息到数据库
            if self.user:
                credential = GmailCredential.objects.filter(user=self.user, is_active=True).first()
                if credential:
                    # 转换时间戳为datetime
                    expiration_time = None
                    if expiration:
                        # 将毫秒时间戳转换为timezone-aware的datetime
                        naive_time = datetime.fromtimestamp(int(expiration)/1000)
                        expiration_time = timezone.make_aware(naive_time)
                    
                    credential.last_history_id = history_id
                    credential.watch_expiration = expiration_time
                    credential.save()
                    
                    logger.info(f"更新Gmail监听信息: {self.user.username}, history_id: {history_id}")
            
            return {
                'historyId': history_id,
                'expiration': expiration
            }
            
        except Exception as e:
            logger.error(f"设置Gmail监听失败: {str(e)}")
            logger.error(traceback.format_exc())
            raise
            
    def get_history(self, start_history_id):
        """获取历史变更"""
        try:
            logger.info(f"获取历史记录，起始ID: {start_history_id}")
            response = self.gmail_service.users().history().list(
                userId='me', startHistoryId=start_history_id
            ).execute()
            
            logger.info(f"历史记录响应: {response}")
            
            history_list = []
            if 'history' in response:
                history_list.extend(response['history'])
                logger.info(f"找到 {len(response['history'])} 个历史记录")
                
                # 获取所有页
                while 'nextPageToken' in response:
                    page_token = response['nextPageToken']
                    response = self.gmail_service.users().history().list(
                        userId='me', startHistoryId=start_history_id, pageToken=page_token
                    ).execute()
                    if 'history' in response:
                        history_list.extend(response['history'])
                        logger.info(f"加载额外 {len(response['history'])} 个历史记录")
            else:
                logger.info(f"没有新的历史记录，最新historyId: {response.get('historyId', 'N/A')}")
            
            # 提取新消息ID
            new_message_ids = set()
            for history in history_list:
                logger.info(f"处理历史记录: {history}")
                if 'messagesAdded' in history:
                    for message in history['messagesAdded']:
                        message_id = message['message']['id']
                        new_message_ids.add(message_id)
                        logger.info(f"新增消息ID: {message_id}")
                        
                if 'labelsAdded' in history:
                    for label in history['labelsAdded']:
                        message_id = label['message']['id']
                        if 'INBOX' in label.get('labelIds', []):
                            new_message_ids.add(message_id)
                            logger.info(f"标签变更的消息ID: {message_id}, 添加了INBOX标签")
            
            if new_message_ids:
                logger.info(f"总共找到 {len(new_message_ids)} 个新消息")
            else:
                logger.info("没有新增消息")
                
            return list(new_message_ids)
            
        except Exception as e:
            logger.error(f"获取Gmail历史记录失败: {str(e)}")
            return []
    
    def process_notification(self, notification_data):
        """处理Gmail推送通知"""
        try:
            # 提取通知数据
            logger.info(f"处理Gmail通知: {notification_data}")
            
            # 处理Google Pub/Sub消息格式
            if isinstance(notification_data, dict) and 'message' in notification_data and 'data' in notification_data['message']:
                try:
                    import base64
                    import json
                    logger.info("检测到Google Pub/Sub消息格式")
                    
                    # Base64解码data字段
                    encoded_data = notification_data['message']['data']
                    decoded_data = base64.b64decode(encoded_data).decode('utf-8')
                    logger.info(f"解码后的数据: {decoded_data}")
                    
                    # 解析JSON获取email和historyId
                    json_data = json.loads(decoded_data)
                    email = json_data.get('emailAddress')
                    history_id = json_data.get('historyId')
                    logger.info(f"从Pub/Sub消息中提取: email={email}, historyId={history_id}")
                except Exception as decode_error:
                    logger.error(f"解析Pub/Sub消息失败: {str(decode_error)}")
                    logger.error(traceback.format_exc())
                    return False
            else:
                # 原始格式处理
                email = notification_data.get('emailAddress')
                history_id = notification_data.get('historyId')
            
            if not email or not history_id:
                logger.error("Gmail通知数据不完整: 找不到emailAddress或historyId")
                return False
                
            # 查找关联用户
            from .models import User
            user = User.objects.filter(email=email).first()
            
            # 如果找不到用户，尝试使用gmail_email字段查找
            if not user:
                logger.info(f"找不到email={email}的用户，尝试使用gmail_email查找")
                from .models import GmailCredential
                credential = GmailCredential.objects.filter(gmail_email=email, is_active=True).first()
                if credential:
                    user = credential.user
                    logger.info(f"通过gmail_email找到用户: {user.email}")
            
            if not user:
                logger.error(f"找不到与 {email} 关联的用户")
                return False
            
            # 初始化Gmail集成
            gmail_integration = GmailIntegration(user)
            if not gmail_integration.authenticate():
                logger.error(f"Gmail认证失败: {email}")
                return False
            
            # 首先尝试使用历史记录API获取新消息
            message_ids = gmail_integration.get_history(history_id)
            if message_ids:
                logger.info(f"从历史记录找到 {len(message_ids)} 个新消息")
                # 处理每个新消息
                for message_id in message_ids:
                    self._process_new_message(gmail_integration, message_id)
                return True
            
            # 如果历史记录API没有返回新消息，尝试获取最近的对话
            logger.info("历史记录API没有返回新消息，尝试获取达人对话")
            
            # 查找所有与该用户关联的达人映射
            from .models import GmailTalentMapping
            mappings = GmailTalentMapping.objects.filter(
                user=user,
                is_active=True
            )
            
            if not mappings.exists():
                logger.info(f"用户 {user.email} 没有达人映射记录")
                return False
            
            # 处理每个达人映射
            for mapping in mappings:
                talent_email = mapping.talent_email
                logger.info(f"处理达人 {talent_email} 的对话")
                
                # 获取达人最近的邮件
                recent_emails = gmail_integration.get_recent_emails(
                    from_email=talent_email,
                    max_results=5  # 限制获取最近5封
                )
                
                if not recent_emails:
                    logger.info(f"没有找到来自 {talent_email} 的最近邮件")
                    continue
                
                logger.info(f"找到 {len(recent_emails)} 封来自 {talent_email} 的最近邮件")
                
                # 创建或获取知识库
                knowledge_base, created = gmail_integration.create_talent_knowledge_base(talent_email)
                kb_action = "创建" if created else "获取"
                logger.info(f"知识库{kb_action}成功: {knowledge_base.name}")
                
                # 保存对话
                result = gmail_integration.save_conversations_to_knowledge_base(recent_emails, knowledge_base)
                logger.info(f"保存达人对话结果: {result}")
            
            return True
            
        except Exception as e:
            logger.error(f"处理Gmail通知失败: {str(e)}")
            logger.error(traceback.format_exc())
            return False
    
    def _process_new_message(self, gmail_integration, message_id):
        """处理新收到的邮件"""
        try:
            # 导入所需模型
            from .models import GmailTalentMapping, GmailAttachment, KnowledgeBase, ChatHistory
            
            # 获取邮件详情
            message = gmail_integration.gmail_service.users().messages().get(
                userId='me', id=message_id
            ).execute()
            
            # 提取邮件内容
            email_data = gmail_integration._extract_email_content(message)
            if not email_data:
                logger.error(f"提取邮件内容失败: {message_id}")
                return False
            
            # 获取发件人邮箱
            from_email = email_data.get('from', '')
            sender_email = ''
            if '<' in from_email and '>' in from_email:
                # 格式如 "姓名 <email@example.com>"
                sender_email = from_email.split('<')[1].split('>')[0]
            else:
                # 格式可能直接是邮箱
                sender_email = from_email
            
            # 根据邮箱判断角色：检查发件人与用户邮箱或者映射的talent邮箱是否匹配
            is_user_email = gmail_integration.user.email.lower() == sender_email.lower()
            
            # 检查是否有与当前用户关联的talent邮箱映射
            is_mapped_talent = False
            talent_mapping = GmailTalentMapping.objects.filter(
                user=gmail_integration.user,
                talent_email=sender_email,
                is_active=True
            ).first()  # 修改为first()以获取实际的对象而不是布尔值
            
            # 如果是用户邮箱或映射的talent邮箱，则为user角色，否则为assistant
            role = 'user' if is_user_email or talent_mapping else 'assistant'
            
            logger.info(f"设置消息角色: {role}, 发件人: {sender_email}, 用户邮箱: {gmail_integration.user.email}, 是否映射达人: {talent_mapping}")
            
            # 查找是否有关联的达人知识库
            kb_name = f"Gmail-{sender_email.split('@')[0]}"
            knowledge_base = KnowledgeBase.objects.filter(name=kb_name).first()
            
            # 如果没有以发件人邮箱命名的知识库，尝试查找自定义知识库
            if not knowledge_base:
                # 查找映射关系
                mapping = GmailTalentMapping.objects.filter(
                    talent_email=sender_email,
                    user=gmail_integration.user,
                    is_active=True
                ).first()
                
                if mapping and mapping.knowledge_base:
                    knowledge_base = mapping.knowledge_base
                    logger.info(f"使用映射的知识库: {knowledge_base.name}")
                else:
                    logger.info(f"收到新邮件，但没有找到关联的达人知识库: {sender_email}")
                    return False
            
            # 查找关联的对话ID
            conversation_id = None
            
            # 1. 首先通过talent_mapping查找
            if talent_mapping and talent_mapping.conversation_id:
                conversation_id = talent_mapping.conversation_id
                logger.info(f"通过达人映射找到对话ID: {conversation_id}")
            
            # 2. 如果没有找到，尝试通过知识库查找任何相关对话
            if not conversation_id:
                existing_conversation = ChatHistory.objects.filter(
                    knowledge_base=knowledge_base,
                    user=gmail_integration.user,
                    is_deleted=False
                ).values('conversation_id').distinct().first()
                
                if existing_conversation:
                    conversation_id = existing_conversation['conversation_id']
                    logger.info(f"通过知识库 {knowledge_base.name} 找到现有对话ID: {conversation_id}")
                    
                    # 更新或创建映射关系
                    if not talent_mapping:
                        GmailTalentMapping.objects.update_or_create(
                            user=gmail_integration.user,
                            talent_email=sender_email,
                            defaults={
                                'knowledge_base': knowledge_base,
                                'conversation_id': conversation_id,
                                'is_active': True
                            }
                        )
                        logger.info(f"更新Gmail达人映射: {sender_email} -> 对话ID {conversation_id}")
            
            # 3. 如果仍没找到，创建新的对话ID
            if not conversation_id:
                conversation_id = str(uuid.uuid4())
                logger.info(f"创建新的对话ID: {conversation_id}")
                
                # 保存映射关系
                if not talent_mapping:
                    GmailTalentMapping.objects.create(
                        user=gmail_integration.user,
                        talent_email=sender_email,
                        knowledge_base=knowledge_base,
                        conversation_id=conversation_id,
                        is_active=True
                    )
                    logger.info(f"已创建新的Gmail达人映射: {sender_email} -> {knowledge_base.name}")
            
            # 检查消息是否已经处理过
            if ChatHistory.objects.filter(
                conversation_id=conversation_id,
                metadata__gmail_message_id=message_id,
                is_deleted=False
            ).exists():
                logger.info(f"邮件已处理过，跳过: {message_id}")
                return True
            
            # 解析邮件日期 - 使用普通datetime而非timezone-aware
            date_str = email_data.get('date', '')
            try:
                date_obj = datetime.strptime(date_str, '%Y-%m-%d %H:%M:%S')
                # 不应用时区转换
                aware_date = date_obj
            except (ValueError, TypeError):
                logger.warning(f"无法解析邮件日期: {date_str}，使用当前时间")
                aware_date = datetime.now()
            
            # 查找适合的parent_id: 使用ID排序而非时间
            try:
                previous_messages = ChatHistory.objects.filter(
                    conversation_id=conversation_id,
                    is_deleted=False
                ).order_by('-id')[:1]
                
                parent_id = None
                if previous_messages:
                    parent_id = str(previous_messages[0].id)
                    logger.info(f"找到父消息ID: {parent_id}")
            except Exception as e:
                logger.error(f"查找父消息失败: {str(e)}")
                logger.error(traceback.format_exc())
                parent_id = None
            
            # 下载附件
            attachment_records = []
            for attachment in email_data.get('attachments', []):
                if 'attachmentId' in attachment:
                    filepath = gmail_integration.download_attachment(
                        message_id, 
                        attachment['attachmentId'],
                        attachment['filename']
                    )
                    
                    if filepath:
                        attachment_records.append({
                            'filepath': filepath,
                            'filename': attachment['filename'],
                            'message_id': message_id,
                            'date': date_str
                        })
            
            # 构建metadata
            metadata = {
                'gmail_message_id': message_id,
                'from': email_data.get('from', ''),
                'date': date_str,
                'subject': email_data.get('subject', ''),
                'dataset_id_list': [str(knowledge_base.id)],
                'dataset_names': [knowledge_base.name]
            }
            
            if attachment_records:
                metadata['message_attachments'] = attachment_records
            
            # 创建聊天记录，不指定时间
            chat_message = ChatHistory.objects.create(
                user=gmail_integration.user,
                knowledge_base=knowledge_base,
                conversation_id=conversation_id,
                parent_id=parent_id,
                role=role,  # 使用上面确定的role变量，而不是硬编码为'assistant'
                content=f"[{email_data['subject']}] {email_data['body']}",
                metadata=metadata
                # 不设置created_at，使用数据库默认时间
            )
            
            # 更新知识库文档
            gmail_integration._append_to_knowledge_base_document(
                knowledge_base, 
                email_data['subject'], 
                email_data['body'],
                gmail_integration.user.email
            )
            
            # 如果有附件，上传到知识库
            if attachment_records:
                gmail_integration._upload_message_attachments_to_knowledge_base(
                    knowledge_base,
                    attachment_records
                )
            
            # 添加WebSocket通知功能
            try:
                # 导入必要的模块
                from channels.layers import get_channel_layer
                from asgiref.sync import async_to_sync
                from django.conf import settings
                
                # 检查是否有WebSocket通道层配置
                channel_layer = get_channel_layer()
                if channel_layer:
                    # 创建通知数据
                    notification_data = {
                        "type": "notification",
                        "data": {
                            "message_type": "new_gmail",
                            "conversation_id": conversation_id,
                            "message": {
                                "id": str(chat_message.id),
                                "role": role,
                                "content": f"[{email_data['subject']}] {email_data['body'][:100]}{'...' if len(email_data['body']) > 100 else ''}",
                                "sender": sender_email,
                                "subject": email_data['subject'],
                                "has_attachments": len(attachment_records) > 0
                            }
                        }
                    }
                    
                    # 发送WebSocket消息
                    async_to_sync(channel_layer.group_send)(
                        f"notification_user_{gmail_integration.user.id}",
                        notification_data
                    )
                    logger.info(f"已发送WebSocket通知: 用户 {gmail_integration.user.id} 收到新Gmail消息")
                    
                    # 创建系统通知记录
                    try:
                        from .models import Notification
                        Notification.objects.create(
                            sender=gmail_integration.user,
                            receiver=gmail_integration.user,
                            title="新Gmail消息",
                            content=f"您收到了来自 {sender_email} 的新邮件: {email_data['subject']}",
                            type="system_notice",
                            related_resource=conversation_id
                        )
                        logger.info(f"已创建系统通知记录: 用户 {gmail_integration.user.id} 的新Gmail消息")
                    except Exception as notification_error:
                        logger.error(f"创建系统通知记录失败: {str(notification_error)}")
            except Exception as ws_error:
                logger.error(f"发送WebSocket通知失败: {str(ws_error)}")
                logger.error(traceback.format_exc())
                # 通知失败不影响消息处理流程，继续执行
            
            logger.info(f"成功处理新邮件: {message_id} 从 {sender_email}")
            return True
            
        except Exception as e:
            logger.error(f"处理新邮件失败: {str(e)}")
            logger.error(traceback.format_exc())
            return False
    
    def get_attachment_by_conversation(self, conversation_id):
        """获取特定对话的所有附件"""
        try:
            # 查找对话记录
            records = ChatHistory.objects.filter(
                conversation_id=conversation_id,
                user=self.user,
                is_deleted=False
            )
            
            if not records:
                logger.warning(f"找不到对话记录: {conversation_id}")
                return []
            
            # 使用GmailAttachment数据模型查询附件
            attachments = []
            records_ids = [record.id for record in records]
            
            gmail_attachments = GmailAttachment.objects.filter(
                chat_message_id__in=records_ids
            ).select_related('chat_message')
            
            for attachment in gmail_attachments:
                chat_message = attachment.chat_message
                attachments.append({
                    'id': str(attachment.id),
                    'filename': attachment.filename,
                    'filepath': attachment.filepath,
                    'mimetype': attachment.mimetype,
                    'filesize': attachment.filesize,
                    'message_id': str(chat_message.id),
                    'gmail_message_id': attachment.gmail_message_id,
                    'role': chat_message.role,
                    'created_at': attachment.created_at.strftime('%Y-%m-%d %H:%M:%S'),
                    'content_preview': chat_message.content[:100] + '...' if len(chat_message.content) > 100 else chat_message.content
                })
            
            return attachments
            
        except Exception as e:
            logger.error(f"获取对话附件失败: {str(e)}")
            return []

    def handle_auth_code(self, auth_code):
        """
        处理授权码并完成OAuth2授权流程，使用与quickstart.py相同的简化流程
        
        Args:
            auth_code (str): 从Google授权页面获取的授权码
            
        Returns:
            bool: 授权是否成功
        """
        try:
            logger.info("开始处理Gmail授权码...")
            
            # 确保client_secret_json已提供
            if not self.client_secret:
                logger.error("未提供client_secret_json，无法处理授权码")
                return False
                
            # 创建临时文件存储client_secret
            client_secret_path = 'client_secret.json'
            with open(client_secret_path, 'w') as f:
                if isinstance(self.client_secret, str):
                    logger.info("client_secret是字符串，解析为JSON")
                    try:
                        # 确保是有效的JSON
                        json_data = json.loads(self.client_secret)
                        json.dump(json_data, f)
                    except json.JSONDecodeError as e:
                        logger.error(f"client_secret不是有效的JSON: {str(e)}")
                        return False
                else:
                    logger.info("client_secret是字典，直接写入文件")
                    json.dump(self.client_secret, f)
            
            logger.info(f"已将client_secret写入临时文件: {client_secret_path}")
            
            try:
                # 确认token目录存在
                token_dir = os.path.dirname(self.token_storage_path)
                if token_dir and not os.path.exists(token_dir):
                    logger.info(f"创建token目录: {token_dir}")
                    os.makedirs(token_dir)
                
                # 设置token存储
                logger.info(f"设置token存储: {self.token_storage_path}")
                store = file.Storage(self.token_storage_path)
                
                # 提取重定向URI
                redirect_uri = None
                if isinstance(self.client_secret, dict):
                    for key in ['web', 'installed']:
                        if key in self.client_secret and 'redirect_uris' in self.client_secret[key]:
                            redirect_uri = self.client_secret[key]['redirect_uris'][0]
                            break
                elif isinstance(self.client_secret, str):
                    try:
                        json_data = json.loads(self.client_secret)
                        for key in ['web', 'installed']:
                            if key in json_data and 'redirect_uris' in json_data[key]:
                                redirect_uri = json_data[key]['redirect_uris'][0]
                                break
                    except:
                        pass
                
                # 如果找不到重定向URI，使用默认值
                if not redirect_uri:
                    redirect_uri = 'urn:ietf:wg:oauth:2.0:oob'
                
                logger.info(f"使用重定向URI: {redirect_uri}")
                
                # 从client_secret创建flow
                logger.info("从client_secret创建授权流程")
                flow = client.flow_from_clientsecrets(
                    client_secret_path,
                    self.SCOPES,
                    redirect_uri=redirect_uri
                )
                
                # 使用授权码交换token
                logger.info("使用授权码交换访问令牌")
                credentials = flow.step2_exchange(auth_code)
                logger.info("成功获取到访问令牌")
                
                # 保存到文件
                logger.info(f"保存凭证到文件: {self.token_storage_path}")
                store.put(credentials)
                
                # 保存到实例变量
                self.credentials = credentials
                
                # 初始化Gmail服务
                logger.info("初始化Gmail服务")
                self.gmail_service = discovery.build('gmail', 'v1', http=credentials.authorize(Http()))
                logger.info("Gmail服务初始化成功")
                
                # 保存到数据库
                from django.utils import timezone
                
                logger.info("保存凭证到数据库")
                # 将凭证对象序列化
                credentials_data = pickle.dumps(credentials)
                
                gmail_credential, created = GmailCredential.objects.update_or_create(
                    user=self.user,
                    defaults={
                        'credentials': credentials_data,
                        'token_path': self.token_storage_path,
                        'updated_at': timezone.now(),
                        'is_active': True
                    }
                )
                
                action = "创建" if created else "更新"
                logger.info(f"已{action}用户 {self.user.username} 的Gmail凭证记录")
                
                # 成功获取凭证后更新单例
                if self.user and self.gmail_service and self.credentials:
                    GmailServiceManager.update_instance(self.user, self.credentials, self.gmail_service)
                
                return True
                
            except client.FlowExchangeError as e:
                logger.error(f"授权码交换失败: {str(e)}")
                return False
            except Exception as e:
                logger.error(f"处理授权码时发生错误: {str(e)}")
                import traceback
                logger.error(traceback.format_exc())
                return False
            finally:
                # 删除临时文件
                if os.path.exists(client_secret_path):
                    logger.info(f"删除临时文件: {client_secret_path}")
                    os.unlink(client_secret_path)
        
        except Exception as e:
            logger.error(f"处理授权码过程中发生异常: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
            return False

    def _upload_attachments_to_knowledge_base(self, knowledge_base, conversations):
        """上传所有邮件附件到知识库"""
        try:
            # 收集所有需要上传的附件
            attachments_to_upload = []
            
            # 从conversations中提取所有附件信息
            for message in conversations:
                if 'attachments' in message and message['attachments']:
                    message_id = message.get('id', '')
                    sender = message.get('from', '未知发件人')
                    subject = message.get('subject', '无主题')
                    date_str = message.get('date', '未知时间')
                    
                    for attachment in message['attachments']:
                        if 'attachmentId' in attachment and 'filename' in attachment:
                            # 下载附件（如果尚未下载）
                            filepath = None
                            
                            # 检查数据库中是否已有记录
                            existing_attachment = GmailAttachment.objects.filter(
                                gmail_message_id=message_id,
                                filename=attachment['filename']
                            ).first()
                            
                            if existing_attachment and os.path.exists(existing_attachment.filepath):
                                filepath = existing_attachment.filepath
                            else:
                                # 下载附件
                                filepath = self.download_attachment(
                                    message_id=message_id,
                                    attachment_id=attachment['attachmentId'],
                                    filename=attachment['filename']
                                )
                            
                            if filepath:
                                attachments_to_upload.append({
                                    'filepath': filepath,
                                    'filename': attachment['filename'],
                                    'message_id': message_id,
                                    'sender': sender,
                                    'subject': subject,
                                    'date': date_str
                                })
            
            # 上传收集到的所有附件
            if attachments_to_upload:
                logger.info(f"开始上传 {len(attachments_to_upload)} 个附件到知识库")
                
                from .views import KnowledgeBaseViewSet
                import django.core.files.uploadedfile as uploadedfile
                
                # 导入FileUploadParser
                from rest_framework.parsers import FileUploadParser
                
                # 创建视图集实例
                kb_viewset = KnowledgeBaseViewSet()
                
                # 批量上传附件
                for i in range(0, len(attachments_to_upload), 10):  # 每批最多10个文件
                    batch = attachments_to_upload[i:i+10]
                    files = []
                    
                    for att in batch:
                        filepath = att['filepath']
                        filename = att['filename']
                        
                        # 确认文件存在
                        if not os.path.exists(filepath):
                            logger.warning(f"附件文件不存在: {filepath}")
                            continue
                        
                        # 读取文件并创建UploadedFile对象
                        with open(filepath, 'rb') as f:
                            file_content = f.read()
                            files.append(uploadedfile.SimpleUploadedFile(
                                name=filename,
                                content=file_content,
                                content_type=mimetypes.guess_type(filepath)[0] or 'application/octet-stream'
                            ))
                    
                    # 如果这批有文件，调用_call_split_api_multiple上传
                    if files:
                        # 直接调用文档分割API
                        split_response = kb_viewset._call_split_api_multiple(files)
                        
                        if not split_response or split_response.get('code') != 200:
                            logger.error(f"附件批量分割失败: {split_response.get('message', '未知错误') if split_response else '请求失败'}")
                            continue
                        
                        # 处理分割后的文档
                        documents_data = split_response.get('data', [])
                        
                        # 对每个文档调用上传API
                        for doc in documents_data:
                            doc_name = doc.get('name', 'Gmail附件')
                            doc_content = doc.get('content', [])
                            
                            # 准备文档数据
                            upload_doc_data = {
                                "name": doc_name,
                                "paragraphs": []
                            }
                            
                            # 将所有段落添加到文档中
                            for paragraph in doc_content:
                                upload_doc_data["paragraphs"].append({
                                    "content": paragraph.get('content', ''),
                                    "title": paragraph.get('title', ''),
                                    "is_active": True,
                                    "problem_list": []
                                })
                            
                            # 调用文档上传API
                            upload_response = kb_viewset._call_upload_api(knowledge_base.external_id, upload_doc_data)
                            
                            if upload_response and upload_response.get('code') == 200 and upload_response.get('data'):
                                # 上传成功，保存记录到数据库
                                document_id = upload_response['data']['id']
                                
                                # 创建文档记录
                                from .models import KnowledgeBaseDocument
                                doc_record = KnowledgeBaseDocument.objects.create(
                                    knowledge_base=knowledge_base,
                                    document_id=document_id,
                                    document_name=doc_name,
                                    external_id=document_id
                                )
                                
                                logger.info(f"Gmail附件文档上传成功，ID: {document_id}, 文件名: {doc_name}")
                
                # 更新知识库文档计数
                knowledge_base.document_count = KnowledgeBaseDocument.objects.filter(
                    knowledge_base=knowledge_base,
                    status='active'
                ).count()
                knowledge_base.save()
                
                logger.info(f"完成附件上传，共 {len(attachments_to_upload)} 个文件")
            
        except Exception as e:
            logger.error(f"上传附件到知识库失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())
    
    def _upload_message_attachments_to_knowledge_base(self, knowledge_base, attachment_records):
        """上传单个邮件的附件到知识库"""
        try:
            # 检查是否有附件需要上传
            if not attachment_records:
                return
            
            logger.info(f"开始上传 {len(attachment_records)} 个附件到知识库")
            
            from .views import KnowledgeBaseViewSet
            import django.core.files.uploadedfile as uploadedfile
            
            # 创建视图集实例
            kb_viewset = KnowledgeBaseViewSet()
            
            # 准备文件列表
            files = []
            
            for att in attachment_records:
                filepath = att.get('filepath')
                filename = att.get('filename')
                
                # 确认文件存在
                if not os.path.exists(filepath):
                    logger.warning(f"附件文件不存在: {filepath}")
                    continue
                
                # 读取文件并创建UploadedFile对象
                with open(filepath, 'rb') as f:
                    file_content = f.read()
                    files.append(uploadedfile.SimpleUploadedFile(
                        name=filename,
                        content=file_content,
                        content_type=mimetypes.guess_type(filepath)[0] or 'application/octet-stream'
                    ))
            
            # 如果有文件，调用_call_split_api_multiple上传
            if files:
                # 直接调用文档分割API
                split_response = kb_viewset._call_split_api_multiple(files)
                
                if not split_response or split_response.get('code') != 200:
                    logger.error(f"附件分割失败: {split_response.get('message', '未知错误') if split_response else '请求失败'}")
                    return
                
                # 处理分割后的文档
                documents_data = split_response.get('data', [])
                
                # 对每个文档调用上传API
                for doc in documents_data:
                    doc_name = doc.get('name', 'Gmail附件')
                    doc_content = doc.get('content', [])
                    
                    # 准备文档数据
                    upload_doc_data = {
                        "name": doc_name,
                        "paragraphs": []
                    }
                    
                    # 将所有段落添加到文档中
                    for paragraph in doc_content:
                        upload_doc_data["paragraphs"].append({
                            "content": paragraph.get('content', ''),
                            "title": paragraph.get('title', ''),
                            "is_active": True,
                            "problem_list": []
                        })
                    
                    # 调用文档上传API
                    upload_response = kb_viewset._call_upload_api(knowledge_base.external_id, upload_doc_data)
                    
                    if upload_response and upload_response.get('code') == 200 and upload_response.get('data'):
                        # 上传成功，保存记录到数据库
                        document_id = upload_response['data']['id']
                        
                        # 创建文档记录
                        from .models import KnowledgeBaseDocument
                        doc_record = KnowledgeBaseDocument.objects.create(
                            knowledge_base=knowledge_base,
                            document_id=document_id,
                            document_name=doc_name,
                            external_id=document_id
                        )
                        
                        logger.info(f"Gmail附件文档上传成功，ID: {document_id}, 文件名: {doc_name}")
                
                # 更新知识库文档计数
                knowledge_base.document_count = KnowledgeBaseDocument.objects.filter(
                    knowledge_base=knowledge_base,
                    status='active'
                ).count()
                knowledge_base.save()
                
                logger.info(f"完成附件上传，共 {len(files)} 个文件")
            
        except Exception as e:
            logger.error(f"上传附件到知识库失败: {str(e)}")
            import traceback
            logger.error(traceback.format_exc())

    def get_recent_emails(self, from_email=None, max_results=10):
        """
        获取最近的邮件（不依赖history_id）
        
        Args:
            from_email (str, optional): 发件人邮箱过滤
            max_results (int, optional): 最大结果数，默认10封
            
        Returns:
            list: 邮件列表
        """
        try:
            # 构建查询
            query = f"from:{from_email}" if from_email else None
            logger.info(f"查询最近邮件: query={query}, max_results={max_results}")
            
            # 查询邮件列表
            response = self.gmail_service.users().messages().list(
                userId='me',
                q=query,
                maxResults=max_results
            ).execute()
            
            if 'messages' not in response:
                logger.info("未找到匹配邮件")
                return []
                
            # 获取邮件详情
            messages = []
            for msg in response['messages']:
                try:
                    message = self.gmail_service.users().messages().get(
                        userId='me', id=msg['id']
                    ).execute()
                    
                    email_data = self._extract_email_content(message)
                    if email_data:
                        messages.append(email_data)
                except Exception as msg_error:
                    logger.error(f"处理邮件 {msg['id']} 失败: {str(msg_error)}")
            
            logger.info(f"获取到 {len(messages)} 封邮件")
            return messages
            
        except Exception as e:
            logger.error(f"获取最近邮件失败: {str(e)}")
            logger.error(traceback.format_exc())
            return []