from pathlib import Path
from typing import Optional, Dict, Union, Type

from .formatting_config import FormattingConfig

from .dict_formatter import DictFormatter
from .simple_tex_formatter import SimpleTeXFormatter
from .dtx_formatter import DTXFormatter
from .pytex_formatter import PyTeXFormatter


def formatter_from_file_extension(
        input_file: Path,
        config: Optional[FormattingConfig] = None,
        locate_file_config: bool = True,
        allow_infile_config: bool = True
) -> PyTeXFormatter:
    switcher: Dict[str, Type[Union[DTXFormatter, SimpleTeXFormatter, DictFormatter]]] = {
        'dtx.pytex': DTXFormatter,
        'sty.pytex': SimpleTeXFormatter,
        'cls.pytex': SimpleTeXFormatter,
        'dict.pytex': DictFormatter
    }
    #  TODO: other formatters
    try:
        [name, extension] = input_file.name.split('.', maxsplit=1)
    except:
        raise NotImplementedError

    return switcher[extension](
        input_file=input_file,
        config=config,
        locate_file_config=locate_file_config,
        allow_infile_config=allow_infile_config
    )