import mimetypes
import os
from typing import Tuple, Optional


class ListGenerator:
    def __init__(self, path: str = None):
        self.path = path
        self.list: list = self._lister(self.path)
        try:
            self._size = len(self.list)
        except TypeError:
            pass
        self._current_index = 0

    def __str__(self) -> str:
        return 'Audio iter generator'

    @classmethod
    def _lister(cls, path) -> list:
        _list: list = []
        try:
            for f in os.walk(path):
                _list.extend(f)
                break
            return sorted(_list[2])
        except TypeError:
            pass

    def __iter__(self):
        return _ListGenerationIter(self)

    def __next__(self):
        if self._current_index < self._size:
            self._current_index += 1


class _FileAttrs:
    def __init__(self, name, path, type, exc):
        self.name = name
        self.path = path
        self.mimetype = type
        self.exc = exc

    def __str__(self):
        return self.name

    def __repr__(self):
        return f'<File attrs name={self.name} path={self.path} exc={self.exc} type=<{self.mimetype}> >'


class _ListGenerationIter:

    def __init__(self, list_class):
        self._current_index = 0
        self._list = list_class.list
        self._name = self._list[self._current_index]
        self._path = list_class.path

        self._size = len(self._list)

    def __iter__(self):
        return self

    @property
    def type(self) -> tuple[Optional[str], Optional[str]]:
        guess = mimetypes.guess_type(f'{self._path}/{self._list[self._current_index]}')[0]
        return guess

    @property
    def _exc(self) -> str:
        try:
            _ret = self._list[self._current_index].split('.')[-1]
        except AttributeError:
            _ret = None
        return _ret

    def __next__(self):
        if self._current_index < self._size:
            _name = self._list[self._current_index]
            _path = self._path
            _type = self._type
            _exc = self._exc
            self._current_index += 1
            memb = _FileAttrs(_name, _path, _type, _exc)
            return memb
        raise StopIteration