import json
from init import db, Meals, scheduler
import datetime
import requests
import hashlib
import time

nomeal = 'Essen nicht (mehr) verfügbar'


def getMeals(day: datetime):
    day = formatDay(day)
    essen = []
    query = Meals.query.filter_by(date=day).all()
    if len(query) != 0:
        for i in query:
            essen += [i.name]
        essen.sort(key=len, reverse=True)
        return essen
    return getMealsFromAPI(day, dbentry=True)


def getMealsFromAPI(day: str, dbentry: bool = False):
    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):
            try:
                jsmeal = jres["data"][0]["lines"][i]["meals"]
                cont = True
            except IndexError:
                essen = []
                cont = False
            if cont:
                for e in range(len(jsmeal)):
                    ji = jsmeal[e]
                    name = ji["name"]
                    if pricetofloat(ji["price"]) >= 1.1:
                        vegan = ji["classifiers"].count("VG") == 1
                        schwein = ji["classifiers"].count("S") == 1
                        if vegan:
                            veget = True
                        else:
                            veget = ji["classifiers"].count("VEG") == 1
                            if veget:
                                if name.count("Reibekäse") > 0:
                                    vegan = True

                        essen += [name]
                        if dbentry:
                            mid = int(hashlib.sha1((day + name).encode("utf-8")).hexdigest(), 16) % (8 ** 8)
                            neu = Meals(date=day, name=name, id=mid, vegan=vegan, vegetarian=veget, schwein=schwein)
                            db.session.add(neu)
                            db.session.commit()
        if not essen:
            essen = [nomeal]
    except KeyError:
        essen = [nomeal]
    return essen


def pricetofloat(price: str):
    price = price[:-2]
    price = price.replace(",", ".")
    try:
        return float(price)
    except ValueError:
        return 0


def formatDay(day: datetime):
    if day.day < 10:
        tag = "0" + str(day.day)
    else:
        tag = str(day.day)
    day = str(day.year) + "-" + str(day.month) + "-" + tag
    return day


@scheduler.task('cron', id="refreshMeals", hour='8-11', day_of_week='*', minute='15', week='*', second='30')
def refreshMeals():
    print("Aktualisiere Essenspläne...\n")
    with scheduler.app.app_context():
        table = Meals.query.all()
        dates = []
        for i in table:
            if i.date not in dates:
                dates += [i.date]
        for i in range(len(dates)):
            dates[i] = formatDay(dates[i])
        for i in dates:
            apinames = getMealsFromAPI(i)
            dbmeals = Meals.query.filter_by(date=i).all()
            dbnames = []
            for m in dbmeals:
                dbnames += [m.name]
            if set (dbnames) != set(apinames) and nomeal not in apinames:
                for n in dbnames:
                    db.session.delete(Meals.query.filter_by(date=i, name=n).first())
                    db.session.commit()
                getMealsFromAPI(i, True)