#  -------------------------------
#  Difficult Rocket
#  Copyright © 2020-2023 by shenjackyuanjie 3695888@qq.com
#  All rights reserved
#  -------------------------------

import re
from typing import Callable, List, Optional, Union, Set

from .data import Option, Argument, Flag, Parsed
from .descriptor import CallBackDescriptor

try:
    from typing import Self
except ImportError:
    from typing import TypeVar
    Self = TypeVar("Self")  # NOQA

from .exception import IllegalName

CallBack = Union[Callable[[str], None], str]  # Equals to `Callable[[str], None] | str`
# 可调用对象或字符串作为回调
# A callable or str as callback

ParseArgFunc = Callable[[str], Optional[type]]
# 解析参数的函数，返回值为 None 时表示解析失败
# function to parse argument, return None when failed

EMPTY_WORDS = re.compile(r"\s", re.I)


def check_name(name: Union[str, List[str]]) -> None:
    """
    Check the name or shortcuts of argument(s) or flag(s).
    The name must not be empty str, and must not contains \\t or \\n or \\f or \\r.
    If that not satisfy the requirements, it will raise exception `IllegalArgumentName`.
    检查 参数或标记 的 名称或快捷方式 是否符合要求。
    名称必须是非空的字符串，且不能包含 \\t 或 \\n 或 \\f 或 \\r。
    如果不符合要求，将会抛出 `IllegalArgumentName` 异常。
    :param name: arguments
    :return: None
    """
    if isinstance(name, str) and EMPTY_WORDS.search(name):
        raise IllegalName("The name of argument must not contains empty words.")
    elif isinstance(name, list) and all((not isinstance(i, str)) and EMPTY_WORDS.search(i) for i in name):
        raise IllegalName("The name of shortcut must be 'str', and must not contains empty words.")
    else:
        raise TypeError("The type of name must be 'str' or 'list[str]'.")


class Literal:
    _tip = CallBackDescriptor("_tip")
    _func = CallBackDescriptor("_func")
    _err_callback = CallBackDescriptor("_err_callback")

    def __init__(self, name: str):
        self.name: str = name
        self.sub: List[Self] = []
        self._tip: Optional[CallBack] = None
        self._func: Optional[CallBack] = None
        self._err_callback: Optional[CallBack] = None

        self._opts: List[Option] = []
        self._args: List[Argument] = []
        self._flags: List[Flag] = []

    def __call__(self, *nodes) -> Self:
        self.sub += nodes
        return self

    def __repr__(self):
        attrs = (k for k in self.__dict__ if not (k.startswith("__") and k.endswith("__")))
        return f"{self.__class__.__name__}({', '.join(f'{k}={v!r}' for k in attrs if (v := self.__dict__[k]))})"

    def arg(self, name: str, types: Optional[Set[type]] = None) -> Self:
        Argument(name=name, types=types)
        return self

    def opt(
            self,
            name: str,
            shortcuts: Optional[List[str]] = None,
            optional: bool = True,
            types: Optional[Set[type]] = None
    ) -> Self:
        check_name(name)
        if shortcuts is not None and len(shortcuts) != 0:
            check_name(shortcuts)
        self._opts.append(
            Option(name=name, shortcuts=shortcuts, optional=optional, types=types)
        )
        return self

    def opt_group(self, opts: List[Option], exclusive: bool = False):
        ...

    def flag(self, name: str, shortcuts: Optional[List[str]] = None) -> Self:
        check_name(name)
        if shortcuts is not None and len(shortcuts) != 0:
            check_name(shortcuts)
        Flag(name=name, shortcuts=shortcuts)
        ...
        return self

    def flag_group(self, flags: List[Flag], exclusive: bool = False) -> Self:

        ...
        return self

    def error(self, callback: CallBack) -> Self:
        self._err_callback = callback
        return self

    def run(self, func: CallBack) -> Self:
        self._func = func
        return self

    def tip(self, tip: CallBack) -> Self:
        self._tip = tip
        return self

    def parse(self, cmd: Union[str, List[str]]) -> Parsed:
        ...

    def to_doc(self) -> str:
        ...


def builder(node: Literal) -> Literal:
    ...