import json
import os
import shutil
import threading
from concurrent import futures

import requests
from lxml import etree


class Comment:
    lock = threading.Lock()  # 多线程全局资源锁

    def __init__(self, keywords_=None) -> None:
        super().__init__()
        self.obj = {'data': {}, 'flag': False}
        self.keywords = keywords_

    # 获取番剧合集弹幕排行榜
    def getCommentSort(self, cids):

        urls = []
        for cid in cids:
            urls.extend(getCidUrls(cid))
        with futures.ThreadPoolExecutor(32) as executor:
            executor.map(self.count, urls)
        for index, data in enumerate(
                sorted(self.obj["data"].items(), key=lambda d: d[1], reverse=True)[
                :50]):
            print('{index}:{data}'.format(index=index + 1, data=data))

    # 获取番剧合集弹幕排行榜
    def count(self, url, desc=None):
        bytes = requests.get(url).content
        comment_selector = etree.HTML(bytes)
        if not desc is None:
            print(desc)
        print("url=%s" % url)
        for comment in comment_selector.xpath('//i//d/text()'):
            if comment in self.obj["data"]:
                with self.lock:
                    self.obj["data"][comment] = self.obj["data"][comment] + 1
            else:
                with self.lock:
                    self.obj["data"][comment] = 1
            if not self.obj["flag"]:
                for keyword in self.keywords:
                    if keyword in comment:
                        self.obj["flag"] = True


# 根据cid获取历史弹幕地址
def getCidUrls(cid):
    urls = []
    url = "https://comment.bilibili.com/rolldate,%d" % cid
    req = requests.get(url)
    if len(req.text) > 0:
        for i in json.loads(req.text):
            urls.append("https://comment.bilibili.com/dmroll,%s,%d" % (i['timestamp'], cid))
    else:
        urls.append("https://comment.bilibili.com/%d.xml" % cid)
    return urls


# 下载弹幕
def downloadXml(path, cid, size=None, histroy=True):
    dlist = set()
    flag = None
    if histroy:
        flag = parseXml(getCidUrls(cid), dlist, size)
    else:
        parseXml("https://comment.bilibili.com/%d.xml" % cid, dlist, size)
    if size is None or (histroy and not size is None and flag):
        if os.path.exists(path):
            shutil.rmtree(path)
        os.makedirs(path)
        f = open('{path}/{cid}.xml'.format(path=path, cid=cid), 'wb')
        f.write(b'<?xml version="1.0" encoding="UTF-8"?><i>')
        for i in dlist:
            f.write(('\r\n' + i).encode())
        f.write(b'\r\n</i>')
        f.close()


def xml(url):
    bytes = requests.get(url).content
    return etree.HTML(bytes)


def parseXml(urls, dlist, size=None):
    if isinstance(urls, str):
        urls = [urls]
    if not size is None:
        size = float(size.strip('%')) / 100.0
    for url in urls:
        comment_selector = xml(url)
        list = comment_selector.xpath('//i//d/text()')
        maxlimit = int(comment_selector.xpath('//i//maxlimit/text()')[0])

        if len(list) > 0:
            print('弹幕数：{list},最大弹幕数：{maxlimit},弹幕池填充：{p}'.format(list=len(list), maxlimit=maxlimit,
                                                                 p='%.2f%%' % (len(list) / maxlimit * 100)))
            for element in comment_selector.xpath('//i//d'):
                if len(element.xpath("text()")) > 0:
                    fstr = '<d p="{p}">{content}</d>'.format(p=str(element.xpath("@p")[0]),
                                                             content=str(element.xpath("text()")[0]))
                    dlist.add(fstr)

                currentSize = len(dlist) / maxlimit
                print('填充率：{l}'.format(l='%.2f%%' % (currentSize * 100)))
                if not size is None and currentSize >= size:
                    return True
    return False


if __name__ == '__main__':
    cids = [7636499, 7636501, 7636500, 7636503, 7636504, 7636502, 7636509, 7636508, 7636506, 7636507, 7636505]

    downloadXml('F:/ABC',12026697,histroy=False)