from LibrusMobile import app
from flask import render_template, request
from core.forms import LoginForm
from core.utils import Site
import lxml.html

@app.route('/', methods=['GET', 'POST'])
def main_page():
    form = LoginForm()
    if request.method == 'POST':
        username=request.form['username']
        password=request.form['password']
        path=Site.user_path
        s=Site.login(username, password)
        url='https://link.com/index'
        user_response=Site.get_content(Site, s, url, path)
        user=', '.join([str(x) for x in user_response])

        context={
            "user": user.replace("(", "- "),
        }
        return render_template("start_page.html", context=context)
    return render_template("index.html", form=form)

@app.route('/marks')
def marks():
    url='https://link.com/marks'
    #Here i have a problem
    return render_template("marks.html")

import requests
import lxml.html


class Site():
    user_path       = '//*[@id="user-section"]/b/text()[1]'

    @staticmethod
    def login(login, passwd):
        url = 'https://link.com/login'
        with requests.session() as s:
            log_in=s.get(url)
            log_in_html= lxml.html.fromstring(log_in.text)
            hidden_inputs = log_in_html.xpath(r'//form//input[@type="hidden"]')
            form = {x.attrib["name"]: x.attrib["value"] for x in hidden_inputs}
            form['login']=login
            form['passwd']=passwd
            request=s.post(url, data=form, stream=True)
            return s



    def get_content(self, session, url, path):
        response=session.get(url)
        b=lxml.html.fromstring(response.text)
        text=b.xpath(path)
        return text