from os.path import basename, dirname
from os.path import join as joinpath
from re import sub

from unidecode import unidecode


class Normalisename:
    def __init__(self, operation, separator, whitelist):
        self._operation, self.operation = None, operation
        self._separator = separator
        self._whitelist = set(whitelist)

    @property
    def operation(self):
        return self._operation

    @operation.setter
    def operation(self, value):
        if not callable(value):
            raise ValueError('Operation must be callable!')
        self._operation = value

    @property
    def separator(self):
        return self._separator

    @property
    def whitelist(self):
        return self._whitelist.union({self.separator})

    def __call__(self, files):
        for path in files:
            if not self.check_normal(path):
                directory = dirname(path)
                filename = basename(path)
                normalpath = joinpath(directory, self.normalname(filename))
                self.operation(path, normalpath)  # pylint: disable=not-callable

    def check_normal(self, filename):
        filename = basename(filename)
        return filename == self.normalname(filename)

    def normalname(self, filename):
        return unidecode(
            ''.join(
                ch for ch in sub(r'\s+', self.separator, filename)
                if ch.isalnum()
                or ch in self.whitelist
            )
        )