# -*- coding: utf-8 -*-
"""
Created on  Mar  10 21:22:22 2021
@author: kimol_love & solar2030
>>>>>>>> This code is designed based on kimol_love's code in his blog, https://blog.csdn.net/kimol_justdo/article/details/112996678?spm=1001.2014.3001.5501     Say thanks to him. Here, a 【for】 command was used so that we can downloading a series of papers by on-click. All we need to prepare is a text file including the lists of paper titles. And at the same time, I solved a bug related to '/' in paper titles. It can trouble troubles because '/' cannot be used in filenames. Using 【str.replace】command, we can replace '/'s with '_', for example, the bug then can be fixed.
>>>>>>>> 
"""
import os
import time
import requests
from bs4 import BeautifulSoup
from tkinter.filedialog import askopenfilename
import matplotlib.pyplot as plt
import numpy as np

path_and_name = askopenfilename(title='Paper lists： title or doi', filetypes=[('TXT', '*.txt')],
                                initialdir='D:\\')
data = []

# Data loading process:
# I. enumerate sequence，start from 0， rows stands for elements in lists.
# II. open txt，read data
# III. data lines：In CHI760E txt format, first data appears at 31th line.
with open(path_and_name)as txt_file:
    line = txt_file.readlines()
    for i, rows in enumerate(line):
        if i in range(0, len(line)):
            data.append(rows)
print(data[0])



def search_article(artName):
    '''
    搜索论文
    ---------------
    输入：论文名
    ---------------
    输出：搜索结果（如果没有返回""，否则返回PDF链接）
    '''
    url = 'https://www.sci-hub.ren/'
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0',
               'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
               'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
               'Accept-Encoding': 'gzip, deflate, br',
               'Content-Type': 'application/x-www-form-urlencoded',
               'Content-Length': '123',
               'Origin': 'https://www.sci-hub.ren',
               'Connection': 'keep-alive',
               'Upgrade-Insecure-Requests': '1'}
    data = {'sci-hub-plugin-check': '',
            'request': artName}
    res = requests.post(url, headers=headers, data=data)
    html = res.text
    soup = BeautifulSoup(html, 'html.parser')
    iframe = soup.find(id='pdf')
    if iframe == None:  # 未找到相应文章
        return ''
    else:
        downUrl = iframe['src']
        if 'http' not in downUrl:
            downUrl = 'https:' + downUrl
        return downUrl


def download_article(downUrl):
    '''
    根据论文链接下载文章
    ----------------------
    输入：论文链接
    ----------------------
    输出：PDF文件二进制
    '''
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0',
               'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
               'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
               'Accept-Encoding': 'gzip, deflate, br',
               'Connection': 'keep-alive',
               'Upgrade-Insecure-Requests': '1'}
    res = requests.get(downUrl, headers=headers)
    return res.content


def welcome():
    '''
    欢迎界面
    '''
    os.system('cls')
    title = '''
               _____  _____ _____      _    _ _    _ ____
              / ____|/ ____|_   _|    | |  | | |  | |  _ \
             | (___ | |      | |______| |__| | |  | | |_) |
              \___ \| |      | |______|  __  | |  | |  _ <
              ____) | |____ _| |_     | |  | | |__| | |_) |
             |_____/ \_____|_____|    |_|  |_|\____/|____/


            '''
    print(title)


if __name__ == '__main__':
#    while True:
     I=[]
     for ii in range(len(data)):
        welcome()
        #request = input('请输入URL、PMID、DOI或者论文标题：')
        request = data[ii].strip()
        title=request.replace("/", "_")
        print('搜索中...')
        downUrl = search_article(request)
        if downUrl == '':
            print('未找到相关论文，请重新搜索！')
            I.append('0')
        else:
            print('论文链接：%s' % downUrl)
            print('下载中...')
            pdf = download_article(downUrl)
            #文献存储目录   D:\doc_E\papers\
            with open('D:\doc_E\papers\%s.pdf' % title, 'wb') as f:
                f.write(pdf)
            print('---下载完成---')
            I.append('1')


        time.sleep(0.8)
     print('下载完成统计: %s', I)