from random import choice
from datetime import date, timedelta
from flask import session, redirect, url_for, request, render_template
from sqlalchemy import desc
from share import share
from create_db import Card, Rating, get_session

"""
testing
"""
def autofill_ratings():
    dbsession = get_session()
    for i in range(100):
        card = Rating(user_id="1", card_id="10", rating_value=choice(["Yes", "Maybe", "No"]), rating_time=date.today()-timedelta(choice([i for i in range(100)])))
        dbsession.add(card)
        dbsession.commit()
        dbsession.close()    
    return None


"""
Main fuctions
"""
def calculate_interval(sorted_rates):
    maybe_factor    = 1.2
    no_factor       = 2.1
    
    print(sorted_rates[0].rating_value)
    if sorted_rates == []:
        #this is a new card, but interval can't be zero cuz multiplication... may have to handeled differently
        return 1
    elif sorted_rates[0].rating_value == "Yes":
        return 1
    elif sorted_rates[0].rating_value == "Maybe":
        sorted_rates.pop(0)
        return calculate_interval(sorted_rates) * maybe_factor
    elif sorted_rates[0].rating_value == "No":
        sorted_rates.pop(0)
        return calculate_interval(sorted_rates) * no_factor
    elif sorted_rates[0].rating_value == "Delete":
        return "Deleted"


def get_interval(card_id):
    """
    takes card_id looks at the history of rates and gives the current interval
    """
    dbsession = get_session()
    sorted_rates_by_card = dbsession.query(Rating).filter(Rating.card_id == card_id).order_by(desc(Rating.rating_time)).all()
    if sorted_rates_by_card == None:
        print("ni kart... kaj zdaj") #@TODO
        return None
    else:
        interval = calculate_interval(sorted_rates_by_card)
        return round(interval)

#print(get_interval(card_id="10"))

def is_due(card_id):
    dbsession = get_session()
    interval = get_interval(card_id)
    
    last_rating_date = dbsession.query(Rating).filter(Rating.card_id == card_id).order_by(desc(Rating.rating_time)).first()
    due_date = last_rating_date.rating_time + timedelta(interval)
    
    return date.today() >= due_date


def list_of_due_cardby_ids(user_id):
    dbsession = get_session()
    cards = dbsession.query(Card).filter(Card.owner_id == user_id).all()
    l = []
    for card in cards:
        if is_due(card.id):
            l.append(card.id)
    return l


def list_of_new_cards(user_id):
    dbsession = get_session()
    cards = dbsession.query(Card).filter(Card.owner_id == user_id).all()
    l = []
    for card in cards:
        rating = dbsession.query(Rating).filter(Rating.card_id == card.id).first()
        if rating == None:
            l.append(card.id)
    return l


def next_card(user_id):
    """
    find a due card in user's collection. A due card is last_review + interval <= current_date. There could be no new card.
    """
    dbsession = get_session()
    #verjetno ne bo tako easy
    next_card = dbsession.query(Rating).filter().first()

    return None

def sr_session():
    dbsession = get_session()
    
    #check if user in 
    if not 'user_id' in session:
        redirect(url_for('login'))
    user_id = session['user_id']
    username = session['username']

    #what is the next card, None means no next card, aka deck done...
    show_card = next_card(user_id)

    # Smo oddali obrazec?
    if request.method == 'POST':
        #get card_if from the card, rendered from the template, data actually from the template...
        card_id = request.form.get('card_id', None)
        if not card_id:
            raise Exception("card_id je nujen!")

        #this is the rendered card aka the card we are rating and submiting the data on
        submit_card = dbsession.query(Card).get(card_id)
        #@TODO check if this card is part of the user's deck to prevent possibile hack?

    # Share
        #Share button pressed? then reset the form - hence the if-else
        share_request = request.form.get("share", None)
        if share_request:
            # @TODO logika za share!
            share(submit_card, user_id)

    # Rate
        #If it's not a share it's a rate!
        else:
            rate = request.form.get('rate', None) #is this get somehow dangerous?
            
            if not rate:
                raise Exception("Need rate info!")

            if rate == "Yes":
                pass
            
            elif rate == "Maybe":
                pass

            elif rate == "No":
                pass

            elif rate == "Delete":
                #@TODO this should delete the file in some cases.
                pass

            # Any more cards?
  
    #Display from
    return render_template("deck/index.html", username=username, card=show_card)