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import inspect
import warnings
from collections.abc import Callable
from functools import wraps
from typing import Any, Self, TypeVar

from xarray.core.options import OPTIONS
from xarray.core.utils import emit_user_level_warning

T = TypeVar("T", bound=Callable)

POSITIONAL_OR_KEYWORD = inspect.Parameter.POSITIONAL_OR_KEYWORD
KEYWORD_ONLY = inspect.Parameter.KEYWORD_ONLY
POSITIONAL_ONLY = inspect.Parameter.POSITIONAL_ONLY
EMPTY = inspect.Parameter.empty


def _deprecate_positional_args(version) -> Callable[[T], T]:
    """Decorator for methods that issues warnings for positional arguments

    Using the keyword-only argument syntax in pep 3102, arguments after the
    ``*`` will issue a warning when passed as a positional argument.

    Parameters
    ----------
    version : str
        version of the library when the positional arguments were deprecated

    Examples
    --------
    Deprecate passing `b` as positional argument:

    def func(a, b=1):
        pass

    @_deprecate_positional_args("v0.1.0")
    def func(a, *, b=2):
        pass

    func(1, 2)

    Notes
    -----
    This function is adapted from scikit-learn under the terms of its license. See
    licences/SCIKIT_LEARN_LICENSE
    """

    def _decorator(func):
        signature = inspect.signature(func)

        pos_or_kw_args = []
        kwonly_args = []
        for name, param in signature.parameters.items():
            if param.kind in (POSITIONAL_OR_KEYWORD, POSITIONAL_ONLY):
                pos_or_kw_args.append(name)
            elif param.kind == KEYWORD_ONLY:
                kwonly_args.append(name)
                if param.default is EMPTY:
                    # IMHO `def f(a, *, b):` does not make sense -> disallow it
                    # if removing this constraint -> need to add these to kwargs as well
                    raise TypeError("Keyword-only param without default disallowed.")

        @wraps(func)
        def inner(*args, **kwargs):
            name = func.__name__
            n_extra_args = len(args) - len(pos_or_kw_args)
            if n_extra_args > 0:
                extra_args = ", ".join(kwonly_args[:n_extra_args])

                warnings.warn(
                    f"Passing '{extra_args}' as positional argument(s) to {name} "
                    f"was deprecated in version {version} and will raise an error two "
                    "releases later. Please pass them as keyword arguments."
                    "",
                    FutureWarning,
                    stacklevel=2,
                )

                zip_args = zip(
                    kwonly_args[:n_extra_args], args[-n_extra_args:], strict=True
                )
                kwargs.update(zip_args)

                return func(*args[:-n_extra_args], **kwargs)

            return func(*args, **kwargs)

        return inner

    return _decorator


def deprecate_dims(func: T, old_name="dims") -> T:
    """
    For functions that previously took `dims` as a kwarg, and have now transitioned to
    `dim`. This decorator will issue a warning if `dims` is passed while forwarding it
    to `dim`.
    """

    @wraps(func)
    def wrapper(*args, **kwargs):
        if old_name in kwargs:
            emit_user_level_warning(
                f"The `{old_name}` argument has been renamed to `dim`, and will be removed "
                "in the future. This renaming is taking place throughout xarray over the "
                "next few releases.",
                # Upgrade to `FutureWarning` in the future, when the renaming is complete.
                PendingDeprecationWarning,
            )
            kwargs["dim"] = kwargs.pop(old_name)
        return func(*args, **kwargs)

    # We're quite confident we're just returning `T` from this function, so it's fine to ignore typing
    # within the function.
    return wrapper  # type: ignore[return-value]


class CombineKwargDefault:
    """Object that handles deprecation cycle for kwarg default values.

    Similar to ReprObject
    """

    _old: str
    _new: str | None
    _name: str

    def __init__(self, *, name: str, old: str, new: str | None):
        self._name = name
        self._old = old
        self._new = new

    def __repr__(self) -> str:
        return str(self._value)

    def __eq__(self, other: Self | Any) -> bool:
        return (
            self._value == other._value
            if isinstance(other, type(self))
            else self._value == other
        )

    @property
    def _value(self) -> str | None:
        return self._new if OPTIONS["use_new_combine_kwarg_defaults"] else self._old

    def __hash__(self) -> int:
        return hash(self._value)

    def __dask_tokenize__(self) -> object:
        from dask.base import normalize_token

        return normalize_token((type(self), self._value))

    def warning_message(self, message: str, recommend_set_options: bool = True) -> str:
        if recommend_set_options:
            recommendation = (
                " To opt in to new defaults and get rid of these warnings now "
                "use `set_options(use_new_combine_kwarg_defaults=True) or "
                f"set {self._name} explicitly."
            )
        else:
            recommendation = (
                f" The recommendation is to set {self._name} explicitly for this case."
            )

        return (
            f"In a future version of xarray the default value for {self._name} will "
            f"change from {self._name}={self._old!r} to {self._name}={self._new!r}. "
            + message
            + recommendation
        )

    def error_message(self) -> str:
        return (
            f" Error might be related to new default (`{self._name}={self._new!r}`). "
            f"Previously the default was `{self._name}={self._old!r}`. "
            f"The recommendation is to set {self._name!r} explicitly for this case."
        )


_DATA_VARS_DEFAULT = CombineKwargDefault(name="data_vars", old="all", new=None)
_COORDS_DEFAULT = CombineKwargDefault(name="coords", old="different", new="minimal")
_COMPAT_CONCAT_DEFAULT = CombineKwargDefault(
    name="compat", old="equals", new="override"
)
_COMPAT_DEFAULT = CombineKwargDefault(name="compat", old="no_conflicts", new="override")
_JOIN_DEFAULT = CombineKwargDefault(name="join", old="outer", new="exact")
