import requests
import re
import csv

def GetResponse(url, data):
    """
    发送请求
    - url: 请求网址
    - data: 请求参数
    """
    # 模拟游览器
    headers = {
        # Cookie 用户信息，常用于检测是否有登陆账号
        "Cookie": "b_nut=1655303638; CURRENT_BLACKGAP=0; i-wanna-go-back=-1; buvid_fp_plain=undefined; buvid3=136172B5-8F7E-42EF-90C5-2D4A04147EE8167644infoc; LIVE_BUVID=AUTO3016558277732131; is-2022-channel=1; DedeUserID=17012171; DedeUserID__ckMd5=f518907167c48789; buvid4=88DCF3D1-502C-06D9-BF49-B7E4F0A0519315466-022061522-P1wwgn5lZ%2FpHMTaSvipifA%3D%3D; rpdid=|(JlRYJ~Ykl)0J'u~|JulJkJm; b_ut=5; FEED_LIVE_VERSION=V_HEADER_LIVE_NO_POP; _uuid=10525FA4C-8522-AFCC-210B4-19DE77B6FC8C66067infoc; enable_web_push=DISABLE; header_theme_version=CLOSE; CURRENT_FNVAL=16; fingerprint=913be879852fe07606cd36fdc205d010; home_feed_column=5; PVID=2; buvid_fp=913be879852fe07606cd36fdc205d010; bili_ticket=eyJhbGciOiJIUzI1NiIsImtpZCI6InMwMyIsInR5cCI6IkpXVCJ9.eyJleHAiOjE3MjY1ODE3NTksImlhdCI6MTcyNjMyMjQ5OSwicGx0IjotMX0.gM_SG7dtVNHO6JWzjJQb9TKfMdYUCQCc5kwBCvwvLTg; bili_ticket_expires=1726581699; CURRENT_QUALITY=120; SESSDATA=453edc86%2C1742051724%2C4ecfc%2A92CjBdMxud0tS4fWj_7UbpyntEQgA3SRR47yjry_nQGUMYCBxWrcLTlEr08nFsh9Jb83oSVkJZQXlsMXN0MkQxRU9lQzZ2NjhmS1BGVHBETjVsUHVTX2lSeG9xMWpYUE1BM3hVcTljZWpUcnUzNmdlU29JMTh4a1otc3VUYUlPUmNPOFFteWctWm1nIIEC; bili_jct=1b519a4b9101a167c49d8dad05dbdb80; b_lsid=AB4510676_191FF788B10; sid=8axcda7r; bmg_af_switch=1; bmg_src_def_domain=i0.hdslb.com; browser_resolution=1707-837; bp_t_offset_17012171=978105529521930240",
        # User-Agent 用户代理，表示游览器基本身份信息/设备信息
        "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"
    }
    
    # 发送请求
    response = requests.get(url = url, params = data, headers = headers)
    
    # 返回内容
    return response

def GetBvids():
    """获取综合排序前300个视频的bvid"""
    pages = 10
    bvids = []
    for page in range(1, pages + 1):
        if len(bvids) >= 300:
            break
        
        # 该页请求网址
        url = f"https://api.bilibili.com/x/web-interface/wbi/search/type?category_id=&search_type=video&ad_resource=5654&__refresh__=true&_extra=&context=&page={page}&page_size=42&pubtime_begin_s=0&pubtime_end_s=0&from_source=&from_spmid=333.337&platform=pc&highlight=1&single_column=0&keyword=2024%E5%B7%B4%E9%BB%8E%E5%A5%A5%E8%BF%90%E4%BC%9A&qv_id=v6jFbUhcT7bjHVQXrLt535Vt7pgQ0qf1&source_tag=3&gaia_vtoken=&dynamic_offset=24&web_location=1430654&w_rid=532d2b5246861f41eb2ab975ff882c0d&wts=1726475442"
        
        # 发送请求 + 获取数据
        jsondata = GetResponse(url = url, data = None).json()  
        
        # 解析数据，提取视频信息
        result = jsondata['data']['result']
        
        #for 循环遍历，提取列表里面元素
        for index in result:
            bvids.append(index['bvid'])
            if len(bvids) >= 300:
                break
    return bvids

def GetCids(bvids):
    """通过bvid获取综合排序前300个视频的cid"""
    cids = []
    for bvid in bvids:
        url = f"https://www.bilibili.com/video/{bvid}"
        response = GetResponse(url = url, data = None)
        
        #通过正则表达式匹配出cid
        cid_pattern = re.compile(r'"cid":(\d+)')
        cid = cid_pattern.search(response.text).group(1)
        
        cids.append(cid)
    return cids

def GetDanmus(cids):
    """通过cid获取综合排序前300个视频的弹幕"""
    DanmuDict = {}
    for cid in cids:
        url = f"https://api.bilibili.com/x/v1/dm/list.so?oid={cid}"
        response = GetResponse(url = url, data = None)
        
        #转码以正常读取中文信息
        response.encoding = 'utf-8'
        
        danmus = re.findall('<d p=".*?">(.*?)</d>', response.text)
        
        #统计每条弹幕的数量
        for danmu in danmus:
            if danmu in DanmuDict:
                DanmuDict[danmu] += 1
            else:
                DanmuDict[danmu] = 1
    return DanmuDict

def ReadCsv(dictdata):
    fileName = "test.csv"
    with open(fileName, 'w', encoding = 'utf-8-sig', newline='') as f:
        fieldnames = ["弹幕", "数量"]
        f_csv = csv.DictWriter(f, fieldnames = fieldnames)
        f_csv.writeheader()
        writer = csv.writer(f)
        for row in dictdata.items():
            writer.writerow(row)

    
def GetInfo():
    """获取视频数据"""
    bvids = GetBvids()
    cids = GetCids(bvids)
    danmus = GetDanmus(cids)
    ReadCsv(danmus)

if __name__  == '__main__':
    GetInfo()