"""helper functions (is it really usefull?)

TODO: maybe all these calculations are to be put in the db storage
"""

def inverted_prince_bigram(bigram):
    "Translates  ch -> Charles"
    inverted_prince_bigram = {value: key for key, value in prince_bigram.items()}
    return inverted_prince_bigram[bigram]


def bigram_prince(prince):
    "Translates Charles_i -> ch_i"
    name, number = prince.split("_")
    return prince_bigram[name] + "_" + number


def trigram_house(house):
    return house_trigram[house]


def make_acteid_from_route(house=None, prince=None, date_and_item=None):
    "/acte/Anjou/Isabelle_i/1441_08_05a -> anj_isa_i_1441_08_05a"
    return "_".join([trigram_house(house), bigram_prince(prince), date_and_item])

def make_timeitem_from_filename(filename):
    """
    "anj_isa_i_1441_08_05a" -> "1441_08_05a"
    """
    trs_fname = filename.split('_')
    return "_".join(trs_fname[3:])

#from flask import abort
#
#def find_one_or_404(collection, **kwargs):
#      """Find a single document or raise a 404.
#
#      This is like :meth:`~pymongo.collection.Collection.find_one`, but
#      rather than returning ``None``, cause a 404 Not Found HTTP status
#      on the request.
#
#      .. code-block:: python
#
#          usercollection = mydb['usercollection']
#
#          @app.route("/user/<username>")
#          def user_profile(username):
#              userfound = find_one_or_404(usercollection, {"_id": username})
#              return render_template("user.html",
#                  user=userfound)
#      """
#      found = collection.find_one(**kwargs)
#      if found is None:
#          abort(404)
#      return found