import time
from random import randrange
import base64
import hashlib
from collections import OrderedDict
from itertools import chain


class Payment():

    vad_number = ""
    secret_key = ""
    urlRetourOK = ""
    urlRetourNOK = ""
    urlIPN = ""
    source = ""
    typeTr = "D"

    def __init__(self, vad_number="", secret_key="", urlRetourOK="",
                 urlRetourNOK="", urlIPN="", source="", typeTr="D"):
        self.vad_number = vad_number
        self.secret_key = secret_key
        self.urlRetourOK = urlRetourOK
        self.urlRetourNOK = urlRetourNOK
        self.urlIPN = urlIPN
        self.source = source
        self.typeTr = typeTr

    def buildSecretHTML(self, produit="Produit", montant="0.00",
                        idTransaction=""):
        if idTransaction == "":
            self.idTransaction = str(time.time())
            self.idTransaction += self.vad_number
            self.idTransaction += str(randrange(999))
        else:
            self.idTransaction = idTransaction

        array_tpe = OrderedDict(
                montant=str(montant),
                idTPE=self.vad_number,
                idTransaction=self.idTransaction,
                devise="EUR",
                lang='fr',
                nom_produit=produit,
                source=self.source,
                urlRetourOK=self.urlRetourOK,
                urlRetourNOK=self.urlRetourNOK,
                typeTr=str(self.typeTr)
        )

        if self.urlIPN != "":
            array_tpe['urlIPN'] = self.urlIPN

        array_tpe['key'] = self.secret_key
        strWithKey = base64.b64encode(bytes(
            '|'.join(array_tpe.values()),
            'utf-8'
        ))
        del array_tpe["key"]
        array_tpe['sec'] = hashlib.sha512(strWithKey).hexdigest()

        ret = ""
        for key in array_tpe:
            ret += '<input type="hidden" name="{k}" value="{v}"/>'.format(
                k=key,
                v=array_type[key]
            )

        return ret

    def validSec(self, values, secret_key):
        if "sec" in values:
            sec = values['sec']
            del values["sec"]
            strWithKey = hashlib.sha512(base64.b64encode(bytes(
                '|'.join(values.values()) + "|" + secret_key,
                'utf-8'
            ))).hexdigest()
            return strWithKey.upper() == sec.upper()
        else:
            return False