# import imageio
# imageio.plugins.ffmpeg.download()

import requests, time, hashlib, urllib.request, re, json
from moviepy.editor import *
import os, sys


# 访问API地址
def get_play_list(start_url, cid, quality):
    entropy = 'rbMCKn@KuamXWlPMoJGsKcbiJKUfkPF_8dABscJntvqhRSETg'
    appkey, sec = ''.join([chr(ord(i) + 2) for i in entropy[::-1]]).split(':')
    params = 'appkey=%s&cid=%s&otype=json&qn=%s&quality=%s&type=' % (appkey, cid, quality, quality)
    chksum = hashlib.md5(bytes(params + sec, 'utf8')).hexdigest()
    url_api = 'https://interface.bilibili.com/v2/playurl?%s&sign=%s' % (params, chksum)
    headers = {
        'Referer': start_url,  # 注意加上referer
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
    }
    # print(url_api)
    html = requests.get(url_api, headers=headers).json()
    # print(json.dumps(html))
    video_list = []
    for i in html['durl']:
        video_list.append(i['url'])
    # print(video_list)
    return video_list

def bv2av(bv):
    table = 'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF'
    tr = {}
    for i in range(58):
        tr[table[i]] = i
    s = [11,10,3,8,4,6]
    xor = 177451812
    add = 8728348608

    r=0
    for i in range(6):
        r+=tr[bv[s[i]]]*58**i
    return (r-add)^xor


def Schedule_cmd(blocknum, blocksize, totalsize):
    pass

    speed = (blocknum * blocksize) / (time.time() - start_time)
    # speed_str = " Speed: %.2f" % speed
    speed_str = " Speed: %s" % format_size(speed)
    recv_size = blocknum * blocksize

    # 设置下载进度条
    f = sys.stdout
    pervent = recv_size / totalsize
    percent_str = "%.2f%%" % (pervent * 100)
    n = round(pervent * 50)
    s = ('#' * n).ljust(50, '-')
    f.write(percent_str.ljust(8, ' ') + '[' + s + ']' + speed_str)
    f.flush()
    # time.sleep(0.1)
    f.write('\r')


def Schedule(blocknum, blocksize, totalsize):
    speed = (blocknum * blocksize) / (time.time() - start_time)
    # speed_str = " Speed: %.2f" % speed
    speed_str = " Speed: %s" % format_size(speed)
    recv_size = blocknum * blocksize

    # 设置下载进度条
    f = sys.stdout
    pervent = recv_size / totalsize
    percent_str = "%.2f%%" % (pervent * 100)
    n = round(pervent * 50)
    s = ('#' * n).ljust(50, '-')
    print(percent_str.ljust(6, ' ') + '-' + speed_str)
    f.flush()
    time.sleep(2)
    # print('\r')


# 字节bytes转化K\M\G
def format_size(bytes):
    try:
        bytes = float(bytes)
        kb = bytes / 1024
    except:
        print("传入的字节格式不对")
        return "Error"
    if kb >= 1024:
        M = kb / 1024
        if M >= 1024:
            G = M / 1024
            return "%.3fG" % (G)
        else:
            return "%.3fM" % (M)
    else:
        return "%.3fK" % (kb)


#  下载视频
def down_video(video_list, title, start_url, page):
    num = 1
    print('[正在下载P{}段视频,请稍等...]:'.format(page) + title)
    currentVideoPath = os.path.join(sys.path[0], 'bilibili_video', title)  # 当前目录作为下载目录
    for i in video_list:
        opener = urllib.request.build_opener()
        # 请求头
        opener.addheaders = [
            # ('Host', 'upos-hz-mirrorks3.acgvideo.com'),  #注意修改host,不用也行
            ('User-Agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:56.0) Gecko/20100101 Firefox/56.0'),
            ('Accept', '*/*'),
            ('Accept-Language', 'en-US,en;q=0.5'),
            ('Accept-Encoding', 'gzip, deflate, br'),
            ('Range', 'bytes=0-'),  # Range 的值要为 bytes=0- 才能下载完整视频
            ('Referer', start_url),  # 注意修改referer,必须要加的!
            ('Origin', 'https://www.bilibili.com'),
            ('Connection', 'keep-alive'),
        ]
        urllib.request.install_opener(opener)
        # 创建文件夹存放下载的视频
        if not os.path.exists(currentVideoPath):
            os.makedirs(currentVideoPath)
        # 开始下载
        if len(video_list) > 1:
            urllib.request.urlretrieve(url=i, filename=os.path.join(currentVideoPath, r'{}-{}.flv'.format(title, num)),reporthook=Schedule_cmd)  # 写成mp4也行  title + '-' + num + '.flv'
        else:
            urllib.request.urlretrieve(url=i, filename=os.path.join(currentVideoPath, r'{}.flv'.format(title)),reporthook=Schedule_cmd)  # 写成mp4也行  title + '-' + num + '.flv'
        num += 1

# 合并视频
def combine_video(video_list, title):
    currentVideoPath = os.path.join(sys.path[0], 'bilibili_video', title)  # 当前目录作为下载目录
    if not os.path.exists(currentVideoPath):
        os.makedirs(currentVideoPath)
    if len(video_list) >= 2:
        # 视频大于一段才要合并
        print('[下载完成,正在合并视频...]:' + title)
        # 定义一个数组
        L = []
        # 访问 video 文件夹 (假设视频都放在这里面)
        root_dir = currentVideoPath
        # 遍历所有文件
        for file in sorted(os.listdir(root_dir), key=lambda x: int(x[x.rindex("-") + 1:x.rindex(".")])):
            # 如果后缀名为 .mp4/.flv
            if os.path.splitext(file)[1] == '.flv':
                # 拼接成完整路径
                filePath = os.path.join(root_dir, file)
                # 载入视频
                video = VideoFileClip(filePath)
                # 添加到数组
                L.append(video)
        # 拼接视频
        final_clip = concatenate_videoclips(L)
        # 生成目标视频文件
        final_clip.to_videofile(os.path.join(root_dir, r'{}.mp4'.format(title)), fps=24, remove_temp=False)
        print('[视频合并完成]' + title)

    else:
        # 视频只有一段则直接打印下载完成
        print('[视频合并完成]:' + title)

start_time = 0

def download_video(avnum=None, quality_=16) -> str:
    global start_time
    print('*' * 30 + 'B站视频下载小助手' + '*' * 30)
    start = input('请输入您要下载的B站av号或者视频链接地址:') if not avnum else avnum
    start_url = 'https://api.bilibili.com/x/web-interface/view?aid=' + start

    # 视频质量
    quality = input('请输入您要下载视频的清晰度(1080p:80;720p:64;480p:32;360p:16)(填写80或64或32或16):') if quality_ != 16 else quality_
    
    # 获取视频的cid,title
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'}
    html = requests.get(start_url, headers=headers).json()
    data = html['data']
    video_title=data["title"].replace(" ","_")
    cid_list = []

    if '?p=' in start:
        # 单独下载分P视频中的一集
        p = re.search(r'\?p=(\d+)',start).group(1)
        cid_list.append(data['pages'][int(p) - 1])
    else:
        # 如果p不存在就是全集下载
        cid_list = data['pages']


    for item in cid_list:
        cid = str(item['cid'])
        title = item['part']
        if not title:
            title = video_title
        title = re.sub(r'[\/\\:*?"<>|]', '', title)  # 替换为空的
        print('[下载视频的cid]:' + cid)
        print('[下载视频的标题]:' + title)
        page = str(item['page'])
        start_url = start_url + "/?p=" + page
        video_list = get_play_list(start_url, cid, quality)
        start_time = time.time()
        down_video(video_list, title, start_url, page)
        combine_video(video_list, title)

    print('[下载完成]')
    return video_title