import requests
import time
from bs4 import BeautifulSoup

# 固定的 User-Agent
custom_user_agent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'

# 固定的 Cookie
custom_cookie = 'SESSDATA=f088e027%2C1742009093%2C2981a%2A91CjAZOWy34Bnk2yutAp0iAkrT9_GnVSnWjaJxjZh5xNycojooqqb3GBAqWEkeXTkUQLQSVk5rcWNaekt5VjNUVkJYV2VtaWo4NHlvc2NPQUFabTRhY2RBUkg5U1B4d3RoMmQ4eXQzN1R3Y1BXc0dBelJEenk4WTgyQjFJRlhmcFZZel94aThkQXVRIIEC; bili_jct=b51d3572b16a74e3ffc7a59f8a252e91; DedeUserID=3494376802093902;'

# 1. 搜索视频，按照综合排序
def get_search_results(keyword, page):
    search_url = "https://api.bilibili.com/x/web-interface/search/type"
    params = {
        "keyword": keyword,
        "page": page,
        "search_type": "video",
        "order": "totalrank"  # 添加综合排序参数
    }
    
    headers = {
        'User-Agent': custom_user_agent,
        'Accept': 'application/json, text/javascript, */*; q=0.01',
        'Referer': 'https://www.bilibili.com/',
        'Cookie': custom_cookie
    }

    try:
        response = requests.get(search_url, headers=headers, params=params)
        response.raise_for_status()  # 检查 HTTP 状态码
        
        result = response.json()
        if 'data' in result and 'result' in result['data']:
            return result['data']['result']
        else:
            print(f"第 {page} 页的搜索结果未找到")
            return []
    except requests.exceptions.HTTPError as http_err:
        print(f"HTTP 错误: {http_err}")
        return []
    except requests.exceptions.RequestException as e:
        print(f"请求失败: {e}")
        return []

# 2. 获取视频的 CID (使用 bvid)
def get_cid(bvid):
    url = f"https://api.bilibili.com/x/player/pagelist?bvid={bvid}"
    headers = {
        'User-Agent': custom_user_agent,
        'Referer': f"https://www.bilibili.com/video/{bvid}",
        'Cookie': custom_cookie
    }

    try:
        response = requests.get(url, headers=headers)
        response.raise_for_status()
        data = response.json()
        if 'data' in data and len(data['data']) > 0:
            return data['data'][0]['cid']  # 获取第一个页面的CID
        else:
            print(f"视频 {bvid} 的 CID 获取失败")
            return None
    except Exception as e:
        print(f"获取 CID 失败: {e}")
        return None

# 3. 获取弹幕
def get_danmaku(cid, bvid):
    danmaku_url = f"https://comment.bilibili.com/{cid}.xml"
    headers = {
        'User-Agent': custom_user_agent,
        'Referer': f"https://www.bilibili.com/video/{bvid}",
        'Cookie': custom_cookie
    }
    
    try:
        response = requests.get(danmaku_url, headers=headers)
        response.raise_for_status()
        soup = BeautifulSoup(response.content, 'lxml')
        danmakus = [d.text for d in soup.find_all('d')]  # 提取每条弹幕的内容
        return danmakus
    except Exception as e:
        print(f"获取弹幕失败: {e}")
        return []

# 4. 主逻辑
def main():
    keyword = "2024巴黎奥运会"
    videos = []
    
    # 获取前300个视频
    for page in range(1, 16):  # 每页有20个视频，15页大概可以获取到300个
        results = get_search_results(keyword, page)
        
        if results:
            videos.extend(results)
            print(f"第 {page} 页获取到 {len(results)} 个视频")
        else:
            print(f"第 {page} 页的搜索结果未找到或请求失败")
        
        if len(videos) >= 300:
            break
        
        time.sleep(1)  # 每页请求间隔1秒
    
    print(f"共找到 {len(videos)} 个视频")
    
    if not videos:
        print("未找到任何视频，停止爬取")
        return
    
    # 获取每个视频的弹幕
    all_danmakus = []
    for i, video in enumerate(videos[:300]):  # 只处理前300个视频
        bvid = video['bvid']  # 使用 bvid 而不是 aid
        title = video['title']
        try:
            cid = get_cid(bvid)
            if cid:
                danmakus = get_danmaku(cid, bvid)
                print(f"获取视频 {i+1}/{len(videos)} 的弹幕: {title}, 弹幕数: {len(danmakus)}")
                all_danmakus.extend(danmakus)
            else:
                print(f"视频 {title} 的 CID 获取失败")
        except Exception as e:
            print(f"视频 {title} 的弹幕获取失败: {e}")
        
        time.sleep(2)  # 每次请求间隔2秒

    # 保存弹幕数据到本地文件
    with open("danmakus_2024_olympics.txt", "w", encoding='utf-8') as f:
        for danmaku in all_danmakus:
            f.write(danmaku + "\n")
    
    print(f"所有弹幕已保存至 danmakus_2024_olympics.txt")

# 运行主程序
if __name__ == "__main__":
    main()