import icalendar
import datetime
import requests
import recurring_ical_events
import json


def getWeek(weekstart: datetime, file: str, showsat: bool):
    if weekstart == "today":
        start_date = datetime.date.today()
    else:
        start_date = weekstart
    start_date -= datetime.timedelta(days=start_date.weekday() % 7)
    end_date = start_date + datetime.timedelta(days=7)
    with open("calendars/" + file) as f:
        calendar = icalendar.Calendar.from_ical(f.read())
    events = recurring_ical_events.of(calendar).between(start_date, end_date)
    eventl = []
    for event in events:
        estart = event["DTSTART"].dt
        formstart = str(estart.hour) + ":" + str(estart.minute)
        eend = event["DTEND"].dt
        formend = str(eend.hour) + ":" + str(eend.minute)
        forml = [formstart, formend]
        for i in range(2):
            if len(forml[i]) != 5:
                if forml[i][-2] == ":":
                    forml[i] = forml[i] + "0"
                if forml[i][1] == ":":
                    forml[i] = "0" + forml[i]
        formstart = forml[0]
        formend = forml[1]
        eventdict = {
            "start": formstart,
            "end": formend,
            "dur": str(event["DTEND"].dt - event["DTSTART"].dt)[:-3],
            "name": event["SUMMARY"],
            "room": event["LOCATION"],
            "weekday": estart.weekday(),
            "day": estart.day
        }
        eventl += [eventdict]
    return eventl, daylist(start_date, showsat)


shortnames = ["mon", "tue", "wed", "thu", "fri", "sat"]
longnames = ["Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag"]


def daylist(weekstart: datetime, showsat: bool):
    weekday = weekstart
    dayl = []
    if showsat:
        r = 6
    else:
        r = 5
    for i in range(r):
        essen = getMeals(weekday)
        dayl += [{
            "day": weekday.day,
            "short": shortnames[i],
            "long": longnames[i],
            "mensa": essen
        }]
        weekday += datetime.timedelta(days=1)
    return dayl


def getMeals(day: datetime):
    if day.day < 10:
        tag = "0" + str(day.day)
    else:
        tag = str(day.day)
    day = str(day.year) + "-" + str(day.month) + "-" + tag
    url = "https://dh-api.paulmartin.cloud/plans/" + day + "?canteens=erzberger"
    response = requests.request("GET", url)
    response = response.content
    jres = json.loads(response.decode("utf-8"))
    essen = []
    try:
        num = len(jres["data"][0]["lines"])
        for i in range(num):
            essen += [jres["data"][0]["lines"][i]["meals"][0]["name"]]
    except KeyError:
        essen = ["Tag nicht (mehr) verfügbar"]
    return essen