import time
from typing import List
import requests
import re
from urllib import parse
from concurrent.futures import ThreadPoolExecutor, as_completed

class BilibiliVideoSpider:
    def __init__(self, session_cookie: str, user_agent: str):
        self.session_cookie = session_cookie
        self.user_agent = user_agent

    def search_videos(self, keyword: str, page: int, page_size: int) -> list:
        headers = {
            "Accept": "application/json, text/plain, */*",
            "Accept-Encoding": "gzip, deflate, br",
            "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
            "Cache-Control": "no-cache",
            "Cookie": self.session_cookie,
            "Origin": "https://search.bilibili.com", 
            "Pragma": "no-cache",
            "Referer": f"https://search.bilibili.com/all?keyword={parse.quote(keyword)}", 
            "User-Agent": self.user_agent,
        }

        params = {
            "search_type": "video",
            "page": page,
            "page_size": page_size,
            "keyword": keyword,
        }

        while True:
            try:
                response = requests.get("https://api.bilibili.com/x/web-interface/search/type", headers=headers, params=params).json()
                if response.get('code') == 0:
                    return [item['id'] for item in response['data'].get('result', [])]
            except Exception as error:
                print(f"Error fetching search results: {error}")
                time.sleep(1)
                continue  # Retry the request if it fails

    def retrieve_cid(self, aid: int) -> int:
        headers = {
            "Accept": "application/json, text/plain, */*",
            "User-Agent": self.user_agent,
            "Cookie": self.session_cookie,
        }

        response = requests.get(f"https://api.bilibili.com/x/player/pagelist?aid={aid}&bvid=", headers=headers)
        if response.status_code == 200:
            data = response.json()
            if data and 'data' in data and len(data['data']) > 0:
                return data['data'][0]['cid']
        raise ValueError(f"No video found for aid {aid}.")

    def fetch_danmaku(self, aid: int) -> List[str]:
        headers = {
            "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8",
            "Cookie": self.session_cookie,
            "User-Agent": self.user_agent
        }

        response = requests.get(f'https://api.bilibili.com/x/v1/dm/list.so?oid={aid}', headers=headers)
        response.encoding = 'utf-8'
        if response.status_code == 200:
            return re.findall('<d p=".*?">(.+?)</d>', response.text)
        else:
            print(f"Failed to fetch danmaku for aid {aid}")
            return []

def fetch_bullet_screen(spider: BilibiliVideoSpider, aid: int) -> List[str]:
    try:
        print(f"Fetching bullet screen for video with aid {aid}...")
        cid = spider.retrieve_cid(aid)
        return spider.fetch_danmaku(cid)
    except Exception as error:
        print(f"Error fetching data for aid {aid}: {error}")
        return []

def main():
    user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 Edg/128.0.0.0"
    session_cookie = "YOUR_COOKIE"  # Replace with your actual cookie

    spider = BilibiliVideoSpider(session_cookie, user_agent)
    keyword = "2024巴黎奥运会"
    results_per_page = 30
    total_pages = 10
    all_danmaku = []

    with ThreadPoolExecutor(max_workers=10) as executor:
        futures = []
        for page in range(1, total_pages + 1):
            print(f"Fetching search results for page {page}...")
            aids = spider.search_videos(keyword, page, results_per_page)
            for aid in aids:
                futures.append(executor.submit(fetch_bullet_screen, spider, aid))

        for future in as_completed(futures):
            all_danmaku.extend(future.result())

    print(f"Total bullet screens fetched: {len(all_danmaku)}")

    # 将弹幕数据保存到 "弹幕.txt" 文件
    with open("弹幕.txt", mode='w', encoding="utf-8") as file:  # 以写入模式打开文件
        for danmaku in all_danmaku:  # 遍历所有弹幕数据
            file.write(danmaku + '\n')  # 将弹幕数据写入文件

if __name__ == "__main__":
    main()