import requests
from bs4 import BeautifulSoup
import time
import random
import re
import logging
from urllib.parse import urlparse
import os  # 导入 os 模块用于文件操作

# 配置日志
logging.basicConfig(filename="Records.log", level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")

def is_valid_url(url):
    #验证 URL 是否有效
    parsed = urlparse(url)
    return bool(parsed.scheme in ["http", "https"] and parsed.netloc)

def sanitize_filename(filename):
    #清理文件名中的非法字符
    return re.sub(r"[^\w\s]", "_", filename)

def pachong(url):
    #爬取网页中的所有链接
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36"
    }

    try:
        response = requests.get(url, headers=headers)
        response.raise_for_status()  # 检查请求是否成功
        soup = BeautifulSoup(response.text, "html.parser")

        # 提取所有链接
        links = set()  # 使用集合去重
        for a_tag in soup.find_all("a", href=True):
            link = a_tag["href"]
            links.add(link)  # 添加到集合中

        logging.info(f"从 {url} 爬取到 {len(links)} 个链接")
        print(f"从 {url} 爬取到 {len(links)} 个链接")
        return links

    except requests.RequestException as e:
        logging.error(f"无法访问 {url}，错误：{e}")
        print(f"无法访问 {url}，错误：{e}")
        return []

def main():
    #主函数
    urls = input("请输入网站的 URL，超过两个用逗号分隔：").strip().split(",")

    for url in urls:
        url = url.strip()  # 去除多余的空格
        if not is_valid_url(url):
            logging.warning(f"无效的 URL：{url}，已跳过")
            print(f"无效的 URL：{url}，已跳过")
            continue

        print(f"正在爬取 {url}...")
        logging.info(f"正在爬取 {url}...")
        links = pachong(url)

        if links:
            # 为每个网站创建一个独立的文件
            filename = sanitize_filename(f"{url.replace('https://', '').replace('www.', '').replace('/', '_')}.txt")

            # 如果文件已存在，删除旧文件
            if os.path.exists(filename):
                logging.info(f"检测到旧文件 {filename}，将用新内容更新。")
                print(f"检测到旧文件 {filename}，将用新内容更新")
                os.remove(filename)

            # 写入新的爬取内容
            with open(filename, "w", encoding="utf-8") as file:
                for link in links:
                    file.write(link + "\n")

            logging.info(f"链接已保存到 {filename}")
            print(f"链接已保存到 {filename}")
            time.sleep(random.uniform(1, 3))  # 随机延迟，避免对服务器造成过大压力

    print("所有网站的链接已分别保存到对应的文件中")
    logging.info("所有网站的链接已分别保存到对应的文件中")

if __name__ == "__main__":
    main()