# -*- coding: utf-8 -*-
"""
Created on Thu Dec  6 09:35:58 2018
@author: M
"""

import re
import requests
import urllib.request
import os
import argparse
import socket

parser = argparse.ArgumentParser(description="test")
parser.add_argument('--keyword', type=str, default='resolution')  # 传参匹配我们想要查找论文的关键字
args = parser.parse_args()

# get web context
r = requests.get('https://openaccess.thecvf.com/CVPR2018?day=2018-06-21')
data = r.text
# find all pdf links
link_list = re.findall(r"(?<=href=\").+?pdf(?=\">pdf)", data)
name_list = re.findall(r"(?<=2018_paper.html\">).+(?=</a>)", data)
socket.setdefaulttimeout(30)
cnt = 0
num = len(link_list)
# your local path to download pdf files
localDir = './CVPR2018/{}/'.format(args.keyword)
if not os.path.exists(localDir):
    os.makedirs(localDir)
while cnt < num:
    url = link_list[cnt]
    # seperate file name from url links
    file_name = name_list[cnt]
    # to avoid some illegal punctuation in file name
    file_name = file_name.replace(':', '_')
    file_name = file_name.replace('\"', '_')
    file_name = file_name.replace('?', '_')
    file_name = file_name.replace('/', '_')
    file_name = file_name.replace(' ', '_')
    search_list = file_name.split('_')
    search_pattern = re.compile(r'{}'.format(args.keyword), re.IGNORECASE)

    download_next_paper = True

    # print([True for i in search_list if search_pattern.findall(i)])
    if ([True for i in search_list if search_pattern.findall(i)]):
        download_next_paper = False

    if download_next_paper:
        cnt = cnt + 1
        continue

    file_path = localDir + file_name + '.pdf'
    if os.path.exists(file_path):
        print('File 【{}.pdf】 exists,skip downloading.'.format(file_name))
        cnt = cnt + 1
        continue
    else:
        # download pdf files
        print('[' + str(cnt) + '/' + str(num) + "]  Downloading -> " + file_path)
        try:
            urllib.request.urlretrieve('http://openaccess.thecvf.com/' + url, file_path)
        except:
            cnt = cnt + 1
            continue
        cnt = cnt + 1
print("all download finished")