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import requests
from lxml import html

conn = requests.session()
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) '
                         'AppleWebKit/537.36 (KHTML, like Gecko) '
                         'Chrome/63.0.3239.26 '
                         'Safari/537.36 Core/1.63.5733.400 '
                         'QQBrowser/10.2.2019.400'}


# 验证码计算
def cal(sen):
    number = sen.split('：')[1].split('等于')[0]
    ans = 0
    if '加' in sen:
        ans = int(number.split('加')[0]) + int(number.split('加')[1])
    elif '减' in sen:
        ans = int(number.split('减')[0]) - int(number.split('减')[1])
    elif '乘以' in sen:
        ans = int(number.split('乘以')[0]) * int(number.split('乘以')[1])
    elif '除以' in sen:
        ans = int(number.split('除以')[0]) / int(number.split('除以')[1])
    return int(ans)


# 中文期刊
def all_journal():
    # 登录
    url = 'http://muchong.com/bbs/logging.php?action=login'
    postdata = {
        'formhash': 'da8aadbd',
        'username': '******',
        'password': '******',
        'cookietime': 31536000,
        'refer': '',
        'loginsubmit': '(unable to decode value)'
    }
    rep = conn.post(url, data=postdata, headers=headers)

    # 验证
    yanzheng = html.fromstring(rep.text)
    question = yanzheng.xpath('//form[@name="input"]/div/text()')[0]
    formhash = yanzheng.xpath('//input[@name="formhash"]/@value')[0]
    post_sec_hash = yanzheng.xpath('//input[@name="post_sec_hash"]/@value')[0]
    answer = cal(question)
    # print(question, answer, formhash, post_sec_hash)
    postdata = {
        'formhash': formhash,
        'post_sec_code': answer,
        'post_sec_hash': post_sec_hash,
        'username': '******',
        'loginsubmit': '(unable to decode value)',
    }
    rep1 = conn.post(url, data=postdata, headers=headers)

    # 期刊
    # 第一页
    url = 'http://muchong.com/bbs/journal_cn.php'
    rep2 = conn.get(url, headers=headers)
    qikan = html.fromstring(rep2.text)
    head_name = qikan.xpath('//div[@class="wrapper"][8]/div[@class="forum_head"]//td/text()')
    all_qikan = qikan.xpath('//div[@class="wrapper"][8]/div[@class="forum_body forum_body_journal"]//tbody')
    for a in all_qikan[:]:
        x = a.xpath('string(.)')
        print(x.split())

    # 第一页往后
    for i in range(2, 23):
        url = 'http://muchong.com/bbs/journal_cn.php?from=emuch&view=&classid=0&class_credit=0&page=' + str(i)
        rep2 = conn.get(url, headers=headers)
        qikan = html.fromstring(rep2.text)
        head_name = qikan.xpath('//div[@class="wrapper"][6]/div[@class="forum_head"]//td/text()')
        all_qikan = qikan.xpath('//div[@class="wrapper"][6]/div[@class="forum_body forum_body_journal"]//tbody')
        for a in all_qikan[:]:
            x = a.xpath('string(.)')
            print(x.split())


def journal_name(name):
    url = 'http://muchong.com/bbs/journal_cn.php'
    name = name.encode("GBK")
    postdata = {
        'issn': '',
        'tagname': '',
        'name': name,
        'ssubmit': '(unable to decode value)',
        'accept-charset': "utf-8"
    }
    rep = conn.post(url, data=postdata, headers=headers)
    qikan = html.fromstring(rep.text)
    every_qikan = qikan.xpath('//div[@class="wrapper"][6]/div[@class="forum_body forum_body_journal"]//tbody')
    for a in every_qikan[:]:
        x = a.xpath('tr/th/a/@href')
        url = 'http://muchong.com/bbs/'+x[0]
        print(url)
        detail(url)


def detail(url):
    rep = conn.get(url, headers=headers)
    _detail = html.fromstring(rep.text)
    # 虫友提供资料
    deta = _detail.xpath('//div[@class="wrapper"][4]/div[@class="forum_explan bg_global"][2]//tr')
    for i in deta:
        i1 = i.xpath('string(.)')
        print(i1.split())


print('----------指定期刊----------')
journal_name('中文信息学报')
print('----------所有核心期刊----------')
all_journal()