#!/usr/bin/env python

__all__ = ['douyutv_download']

from ..common import *
import json
import hashlib
import time
import random
import string
import urllib.parse, urllib.request

def douyutv_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
    html = get_content(url)
    room_id_patt = r'"room_id"\s*:\s*(\d+),'
    room_id = match1(html, room_id_patt)

    json_request_url = "http://m.douyu.com/html5/live?roomId=%s" % room_id
    content = get_content(json_request_url)
    data = json.loads(content)['data']
    server_status = data.get('error',0)
    if server_status is not 0:
        raise ValueError("Server returned error:%s" % server_status)

    title = data.get('room_name')
    show_status = data.get('show_status')
    if show_status is not "1":
        raise ValueError("The live stream is not online! (Errno:%s)" % server_status)

    tt = int(time.time() / 60)
    did = ''.join([random.choice(string.ascii_uppercase + string.digits) for n in range(32)])
    sign_content = '{room_id}{did}A12Svb&%1UUmf@hC{tt}'.format(room_id = room_id, did = did, tt = tt)
    sign = hashlib.md5(sign_content.encode('utf-8')).hexdigest()

    json_request_url = "http://www.douyu.com/lapi/live/getPlay/%s" % room_id
    payload = {'cdn': 'ws', 'rate': '0', 'tt': tt, 'did': did, 'sign': sign}
    postdata = urllib.parse.urlencode(payload)
    req = urllib.request.Request(json_request_url, postdata.encode('utf-8'))
    with urllib.request.urlopen(req) as response:
        the_page = response.read()

    content = json.loads(the_page.decode('utf-8'))
    data = content['data']
    server_status = data.get('error',0)
    if server_status is not 0:
        raise ValueError("Server returned error:%s" % server_status)

    real_url = data.get('rtmp_url')+'/'+data.get('rtmp_live')

    print_info(site_info, title, 'flv', float('inf'))
    if not info_only:
        download_url_ffmpeg(real_url, title, 'flv', None, output_dir, merge = merge)

site_info = "douyu.com"
download = douyutv_download
download_playlist = playlist_not_supported('douyu')