import pathlib
import warnings
from typing import Any, Callable, Dict, Optional, Sequence, Tuple, Type, Union

__all__ = (
    "Types",
    "SYSTEMD_SERVICE_CONFIG",
    "SYSTEMD_NETWORK_CONFIG",
    "SYSTEMD_CONFIG_ROOT",
    "systemdbool",
)


SYSTEMD_CONFIG_ROOT = pathlib.Path("/etc/systemd")
SYSTEMD_NETWORK_CONFIG = SYSTEMD_CONFIG_ROOT / "network"
SYSTEMD_SERVICE_CONFIG = SYSTEMD_CONFIG_ROOT / "system"


class _sdict(dict):
    _help: Optional[str]
    __name__: str


class _Type:
    def __dir__(self) -> tuple:
        return (
            "str",
            "bool",
            "int",
            "float",
            "path",
            "raw",
            "jsonarg",
            "json",
            "bytes",
            "dict",
            "list",
            "bits",
            "__doc__",
        )

    def list(
        self,
        elements: Union[Type[object], str, dict],
        required: bool = False,
        help: Optional[str] = None,
    ) -> _sdict:
        option = _sdict(type="list", required=required)
        if not isinstance(elements, (str, _sdict)):
            option["elements"] = elements.__name__
        elif isinstance(elements, dict):
            option["elements"] = elements["type"]
            if elements["type"] == "dict":
                option["options"] = dict()
                for name, value in elements["option"].items():
                    option["options"][name] = value
                    if isinstance(value, _sdict) and value._help is not None:
                        option["options"][name]["description"] = value._help
                    elif "description" in option["options"][name]:
                        pass
                    else:
                        warnings.warn(
                            "helptext of option {} is unset. Ansible requires suboptions to have an documentation".format(name),
                        )

        option._help = help
        return option

    def dict(self, required: bool = False, help: Optional[str] = None, **options: dict) -> _sdict:
        option = _sdict(type="dict", required=required)
        option["option"] = options
        option._help = help
        return option

    def __getattr__(self, name: str):
        def argument(
            required: bool = False,
            help: Optional[str] = None,
            choices: Optional[Sequence] = None,
            default: Optional[Any] = None,
        ):
            """Simple wrapper for Ansible {0} argument dict"""
            output = _sdict(type=name, required=required)
            if choices is not None:
                output["choices"] = choices
            if default is not None:
                output["default"] = default
            output._help = help
            return output

        argument.__name__ = name
        argument.__doc__ = argument.__doc__.format(name)  # type: ignore
        return argument


Types = _Type()


def systemdbool(b: Union[bool, str]) -> str:
    if b is True:
        return "yes"
    elif b is False:
        return "no"
    return b