"""
Author: Cristian Di Pietrantonio

Doodle scheduler
"""
import json
import requests
import datetime


def parse_doodle(pollID):
    """
    Retrieves poll data from doodle.com given the poll identifier.
    
    Parameters:
    -----------
        - `pollID`: the poll identifier (get it from the url)
    
    Returns:
    --------
    a tuple (participants, options, calendar) where
        - `participants` is a mapping userID -> userName
        - `options` is a list of datetime objects, representing the poll options
        - `calendar` is a mapping optionIndex -> list of userID
    """
    JSON = requests.get("https://doodle.com/api/v2.0/polls/" + pollID).content.decode('utf-8')
    JSON = json.loads(JSON)

    options = [datetime.datetime.fromtimestamp(x['start']/1000) for x in JSON['options']]
    calendar = dict([(i, list()) for i in range(len(options))])
    participants = dict()
    for participant in JSON['participants']:
        pID = participant['id']
        pName = participant['name']
        participants[pID] = pName

        for i, pref in enumerate(participant['preferences']):
            if pref == 1:
                calendar[i].append(pID)
        
    for k in calendar:
        if len(calendar[k]) == 0:
            calendar[k].append(-1) # empty shift
    
    participants[-1] = "<vuoto>"

    return participants, options, calendar