import functools
import re

import flask

text2bool = {"absència": True, "presència": False, "absent": True, "present": False}
bool2text = {True: "absent", False: "present"}

app = flask.Flask(__name__)


class HTTPError(flask.Response, Exception):
    def __init__(self, *args, status_code, **kwargs):
        super().__init__(*args, **kwargs)
        self.status_code = status_code


def handle_errors(func):
    @functools.wraps(func)
    def wrapped(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except HTTPError as r:
            return r, r.status_code
        except Exception:
            return flask.Response("Oh no! Hi ha hagut un error en el servidor :(", status="Internal error"), 500

    return wrapped


@app.route("/calcula", methods=['POST'])
@handle_errors
def calcula():
    frase = flask.request.get_json().get('frase')
    if not frase:
        raise HTTPError("Cal introduir una frase!", status_code=400, status="Missing parameter")
    return calcula_presencia(frase)


def xor(a, b):
    return (a and not b) or (b and not a)


def calcula_presencia(frase):
    frase = frase[3:]
    subjecte, atribut = frase.split(" és ")
    llista_subjecte = re.split(" de | d'", subjecte)
    objecte = llista_subjecte[-1]
    llista_bool = [text2bool[x.strip()] for x in llista_subjecte[:-1]]
    bool_total = text2bool[atribut]
    for bool in llista_bool:
        bool_total = xor(bool_total, bool)
    return f'{objecte} és {bool2text[bool_total]}'


if __name__ == "__main__":
    app.run()