import urllib.request
import os

def url_open(url):
    req=urllib.request.Request(url)
    req.add_header('User_Agent','Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36')
    response = urllib.request.urlopen(url)
    html = response.read()

    return html

def get_page(url):
    html = url_open(url).decode('utf-8')

    a = html.find('current-comment-page')+23
    b = html.find(']',a)

    return html[a:b]
     

def find_imgs(url):
    html=url_open(url).decode('utf-8')
    img_addrs=[]
    
    a = html.find('img src=')

    while a != -1:
        b = html.find('.jpg',a,a+255)
        if b != -1:
            img_addrs.append("http:"+html[a+9:b+4])
        else: 
            b = a + 9
            
        a = html.find('img src=',b)

    return img_addrs

def save_imgs(folder,img_addrs):
    for each in img_addrs:
        filename=each.split('/')[-1]
        with open(filename,'wb') as f:
            img = url_open(each)
            f.write(img)

def download_mm(folder='OOXX',pages=10):
    os.mkdir(folder)
    os.chdir(folder)

    url="http://jandan.net/ooxx/"
    page_num = int(get_page(url))

    for i in range(pages):
        page_num-=i
        page_url= url+'page-'+str(page_num)+'#comments'
        img_addrs=find_imgs(page_url)
        save_imgs(folder,img_addrs)

if __name__=='__main__':
    download_mm()
