import requests
import os
import datetime

def download(url):
    #return None
    filename = 'mpg/'+url+'.pdf'
    url = 'http://www.mpglu.de/vps/'+url+'.pdf'
    req = requests.get(url, auth=('schueler', 'Ing8gresk'))
    file = open(filename, 'wb')
    for chunk in req.iter_content(100000):
        file.write(chunk)
    file.close()
    return None

def modification_date(filename):
    t = os.path.getmtime(filename)
    return datetime.datetime.fromtimestamp(t)


try:
    os.rename('mpg/heute.pdf', 'mpg/heute1.pdf')
except FileNotFoundError:
    print("File Heute.PDF not found")
    print("Will try to download it from the MPG-Server")
    url = 'heute'
    download(url)
    os.rename('mpg/heute.pdf', 'mpg/heute1.pdf')
try:
    os.rename('mpg/morgen.pdf', 'mpg/morgen1.pdf')
except FileNotFoundError:
    print("File Morgen.PDF not found")
    print("Will try to download it from the MPG-Server")
    url = 'morgen'
    download(url)
    os.rename('mpg/morgen.pdf', 'mpg/morgen1.pdf')


url = 'morgen'
download(url)
url = 'heute'
download(url)

x=os.stat('mpg/heute.pdf')
x = x.st_size
y=os.stat('mpg/heute1.pdf')
y = y.st_size
if x != y :
    print("die Dateien sind ungleich")
    os.system('s-nail -a mpg/heute.pdf -s "Alpha-MPG-Vertretungsliste" schneeschieben@web.de')
else:
    print ("Es gibt keine neuen Mals")