from system.api import config_set, config_get
from projector.models import SLIDE


def get_slide_from_sid(sid):
    data = sid.split()
    if len(data) == 2:
        model = data[0]
        id = data[1]
        return SLIDE[model].objects.get(pk=id).slide()
    if len(data) == 1:
        try:
            return SLIDE[data[0]]()
        except KeyError:
            return None
    return None


def get_active_slide(only_sid=False):
    """
    Returns the active slide. If no slide is active, or it can not find an Item,
    it raise an error

    if only_sid is True, returns only the id of this item. Returns None if not Item
    is active. Does not Raise Item.DoesNotExist
    """
    sid = config_get("presentation", None)

    if only_sid:
        return sid
    return get_slide_from_sid(sid)


def set_active_slide(sid):
    config_set("presentation", sid)


def register_slidemodel(model):
    SLIDE[model.prefix] = model


def register_slidefunc(name, func):
    if ' ' in name:
        raise NameError('There can be no space in name')
    SLIDE[name] = func


## def assignment_votes(item):
    ## votes = []
    ## if item.type == "ItemAssignment":
        ## assignment = item.cast().assignment
        ## publish_winner_results_only = config_get("assignment_publish_winner_results_only")
        ## # list of votes
        ## votes = []
        ## for candidate in assignment.candidates:
            ## tmplist = [[candidate, assignment.is_elected(candidate)], []]
            ## for poll in assignment.poll_set.all():
                ## if poll.published:
                    ## if candidate in poll.options_values:
                        ## # check config option 'publish_winner_results_only'
                        ## if not publish_winner_results_only \
                        ## or publish_winner_results_only and assignment.is_elected(candidate):
                            ## option = Option.objects.filter(poll=poll).filter(user=candidate)[0]
                            ## if poll.optiondecision:
                                ## tmplist[1].append([option.yes, option.no, option.undesided])
                            ## else:
                                ## tmplist[1].append(option.yes)
                        ## else:
                            ## tmplist[1].append("")
                    ## else:
                        ## tmplist[1].append("-")
            ## votes.append(tmplist)
    ## return votes
##
##
## def assignment_polls(item):
    ## polls = []
    ## if item.type == "ItemAssignment":
        ## for poll in item.cast().assignment.poll_set.filter(assignment=item.cast().assignment):
            ## polls.append(poll)
    ## return polls