import imaplib
from datetime import datetime
import email.utils
import email.header
from astrbot.api import logger
import email  
from lxml import html
import re
import os
from astrbot.api.star import StarTools


# 登录邮箱 下载文件
def emaillog(self):
    logger.info(f" 开始执行 登录邮箱 {self.email_usr} 命令 ")
    # 邮箱登录用户名
    email_user = self.email_usr
    # 邮箱授权码(非登录密码)，用于IMAP协议认证
    email_password = self.emcil_paswd
    # IMAP服务器地址，Foxmail使用QQ邮箱的IMAP服务器
    imap_server = self.emcil_imap 
    mail = imaplib.IMAP4_SSL(imap_server)
    # 使用用户名和授权码登录邮箱
    # try:
    mail.login(email_user, email_password)
    # 查询收件箱 只读模式
    mail.select("inbox",readonly=True)
    # 设定查询条件 
    for emlname in self.emcil_white:
        from_clause = " OR ".join([f'FROM "{sender}"' for sender in emlname])
            # 获取今天的日期，格式化为IMAP要求的格式(如"21-Jul-2025")
        today = datetime.now().strftime("%d-%b-%Y")
        today = today.encode('utf-8')
        search_criteria = f'({from_clause} SINCE "{today}" HAS attachment)'
        logger.info(f"严格模式: 只处理今天({today})收到的邮件")
        logger.info(f"发件人白名单: {self.emcil_white}")
        logger.info(f"搜索条件: {search_criteria}")

        # 执行IMAP搜索命令
        status, messages = mail.search(None, search_criteria)
        if status != "OK":  # 检查搜索是否成功
            raise Exception("邮件搜索失败")

        # 获取邮件ID列表并只取最后20个（最新的20封）
        mail_ids = messages[0].split()[-20:]
        logger.info(f"获取到邮件数量: {len(messages)}")
        filenames = ""
        for mail_id in reversed(mail_ids):
            # 获取邮件完整内容(RFC822格式)
            status, msg_data = mail.fetch(mail_id, "(RFC822)")
            if status != "OK":  # 如果获取失败则跳过
                continue
            # 解析邮件内容为Message对象
            email_message = email.message_from_bytes(msg_data[0][1])
            # 验证发件人是否在白名单中
            # ========================
            from_header = email.utils.parseaddr(email_message['From'])[1]  # 解析发件人邮箱
            # logger.info(f"邮件发件人: {from_header}")
            if from_header not in self.emcil_white:  # 严格检查白名单
                # logger.info(f"跳过非白名单发件人: {from_header}")
                continue

            # 遍历邮件各部分
            # =============
            for part in email_message.walk():  # 递归遍历邮件所有部分
                if part.get_content_maintype() == "multipart":  # 跳过multipart容器部分
                    continue
                filename = part.get_filename()  # 获取附件文件名
                # 获取正文
                maildata = part.get_payload(decode=True)
                # 微信导出文件需要点击链接下载 检测正文中是否包含链接 解析正文内容 筛选a标签获取下载链接
                etree = html.etree
                tree = etree.HTML(maildata)
                # logger.info(f"邮件正文{maildata}")
                a_tags = tree.xpath('//a')
                mail_date = email.utils.parsedate_to_datetime(email_message['Date']) if email_message['Date'] else None
                mail_date = re.sub(r"[^\u4e00-\u9fa5a-zA-Z0-9]", "", str(mail_date))
                for a_tag in a_tags:
                    # 获取到url后下载url
                    urlt = a_tag.get("href")
                    if urlt:
                        try:
                            filenames += self.download_file(urlt=urlt,filenamett=f"{from_header}{mail_date}")
                        except Exception as e:
                            logger.debug(f"URl 文件下载失败：{e}")
                # 处理无文件名的情况
                # ================
                if not filename:  # 如果附件没有文件名
                    # 按日期发件人生成附件名
                    filename = f"{from_header}{mail_date}.zip"
                # 文件名处理
                # =========
                # 解码邮件头中的文件名
                try:
                    decoded_name = email.header.decode_header(filename)[0][0]
                    if isinstance(decoded_name, bytes):
                        decoded_name = decoded_name.decode()
                except Exception as e:
                    # 文件名解析失败 自动生成新名字
                    decoded_name,filename = f"{from_header}{mail_date}.zip"
                today_str = datetime.now().strftime("%Y%m%d")  # 获取当前日期字符串
                base_name, ext = os.path.splitext(decoded_name)  # 拆分文件名和扩展名
                # 生成新文件名格式：YYYYMMDD-原文件名.zip
                new_filename = f"{today_str}-{base_name}{ext}"
                if filename:
                    new_filename = filename
                # 拼接完整的文件保存路径
                filepath = os.path.join(StarTools.get_data_dir("astrbot_bdzxb_bill"), new_filename)  
                if new_filename not in self.no_file:
                    # 附件保存处理
                    # 以二进制模式保存附件
                    with open(filepath, "wb") as f:  
                        f.write(part.get_payload(decode=True))  # 解码并写入附件内容
                    # logger.info(f"下载附件: {filename} -> {new_filename}")  
                    filenames += new_filename+"\n"
    return "获取成功:"+filenames