import re
class Geohash36:
    def __init__(self, code: str, alfabet="23456789bBCdDFgGhHjJKlLMnNPqQrRtTVWX"):
        self.alfabet = alfabet
        # alfabet controle
        if not re.match("^[A-Za-z0-9]*$", self.alfabet):
            raise AssertionError("ongeldig alfabet")
        if not isinstance(alfabet, str) or len(alfabet) != 36 or len(alfabet) != len(set(alfabet)):
            raise AssertionError("ongeldig alfabet")
        #code controle
        if code[-2] == "-":
            self.code = code[:-2]
            self.controle_getal = code[-1]
        else:
            self.code = code
            self.controle_getal = "abcdefghijklmnopqrstuvwxyz"[self.get_calculate_controlegetal()]
        for letter in self.code:
            if not alfabet.__contains__(letter):
                raise AssertionError("ongeldige code")
        if self.controle_getal != None:
            letter_van_alfabet = "abcdefghijklmnopqrstuvwxyz".find(self.controle_getal)
            if self.get_calculate_controlegetal() != letter_van_alfabet:
                raise AssertionError("ongeldige code")

    def get_calculate_controlegetal(self):
        totale_som = 0
        for i, letter in enumerate(self.code):
            index_alfa = self.alfabet.find(letter)
            totale_som += index_alfa * (len(self.code) - i)
        return totale_som % 26

    def __repr__(self):
        if self.alfabet == "23456789bBCdDFgGhHjJKlLMnNPqQrRtTVWX":
            return f"Geohash36('{self.code}-{self.controle_getal}')"
        return f"Geohash36('{self.code}-{self.controle_getal}', alfabet='{self.alfabet}')"

    def __str__(self):
        return f"{self.code}-{self.controle_getal}"

    def checksum(self):
        return self.controle_getal

    def positie(self, t: str):
        if self.alfabet.__contains__(t):
            t_id = self.alfabet.find(t)
            rij = 6-(t_id//6)-1
            kolom = t_id % 6
            return (rij,kolom)
        else:
            raise AssertionError("ongeldig teken")

    def lengtegraad(self):
        l = -180
        u = 180
        for letter in self.code:
            k = self.positie(letter).__getitem__(1)
            new_l = l + k * ((u - l)/6)
            new_u = l + (k + 1) * ((u - l)/6)
            l = new_l
            u = new_u
        return (l,u)


    def breedtegraad(self):
        l = -90
        u = 90
        for letter in self.code:
            r = self.positie(letter).__getitem__(0)
            new_l = l + r * ((u - l)/6)
            new_u = l + (r + 1) * ((u - l)/6)
            l = new_l
            u = new_u
        return (l,u)

    def coordinaat(self):
        lengtegraad = self.lengtegraad()
        lengte = (lengtegraad.__getitem__(1) - lengtegraad.__getitem__(0))/2+lengtegraad.__getitem__(0)
        breedtegraad = self.breedtegraad()
        breedte = (breedtegraad.__getitem__(1) - breedtegraad.__getitem__(0))/2+breedtegraad.__getitem__(0)
        return (lengte,breedte)