import urllib.error
from urllib.request import urlretrieve
import icalendar
import json
import recurring_ical_events
from init import scheduler


def parseURL(url: str):
    rapla = url.find("rapla.")
    if rapla == -1:
        return 0
    elif len(url[:rapla]) == 4 or len(url[:rapla]) > 6:
        url = url[rapla:]
    http = url.find(":")
    if url[:http] == "http":
        url = "https" + url[http:]
    elif http == -1:
        url = "https://" + url
    p = url.find("page=")
    u = url.find("&")
    if (url[p + 5:u]).lower() == "ical":
        return url
    elif p != -1:
        return url[:p + 5] + "ical" + url[u:]
    else:
        return 0


def getNewRapla(url: str):
    url = parseURL(url)
    if url == 0:
        return 0
    urlfile = url.find("file=")
    kurs = url[urlfile + 5:].upper()

    try:
        urlretrieve(url, "calendars/rapla" + kurs + ".ical")
    except urllib.error.URLError:
        return -1

    file = open("calendars/list.json", "r+")
    jsoncal = json.load(file)
    jsoncal.update({kurs: ["rapla" + kurs + ".ical", url]})
    file.close()
    file = open("calendars/list.json", "w")
    json.dump(jsoncal, file, indent=4)
    return "rapla" + kurs + ".ical"


def getIcal(kurs: str):
    file = open("calendars/list.json", "r")
    jf = json.load(file)
    try:
        return jf[kurs][0]
    except KeyError:
        return None


def getRaplas():
    file = open("calendars/list.json", "r")
    jsonf = json.load(file)
    kursl = []
    filel = []
    urll = []
    for i in jsonf:
        kursl += [i]
        filel += [jsonf[i][0]]
        urll += [jsonf[i][1]]
    return sorted(kursl), sorted(filel), sorted(urll)


@scheduler.task("interval", id="refreshRapla", minutes=30)
def refreshRapla():
    filel = getRaplas()[1]
    urll = getRaplas()[2]
    for i in range(len(filel)):
        urlretrieve(urll[i], "calendars/"+filel[i])
    print("Update die Kalender...")