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from collections.abc import Sequence
from typing import TypeVar, Any, overload, Union, Literal

from numpy import (
    ndarray,
    dtype,
    bool_,
    number,
    _OrderKACF,
)
from numpy._typing import (
    _ArrayLikeBool_co,
    _ArrayLikeUInt_co,
    _ArrayLikeInt_co,
    _ArrayLikeFloat_co,
    _ArrayLikeComplex_co,
    _ArrayLikeObject_co,
    _DTypeLikeBool,
    _DTypeLikeUInt,
    _DTypeLikeInt,
    _DTypeLikeFloat,
    _DTypeLikeComplex,
    _DTypeLikeComplex_co,
    _DTypeLikeObject,
)

_ArrayType = TypeVar(
    "_ArrayType",
    bound=ndarray[Any, dtype[Union[bool_, number[Any]]]],
)

_OptimizeKind = None | bool | Literal["greedy", "optimal"] | Sequence[Any]
_CastingSafe = Literal["no", "equiv", "safe", "same_kind"]
_CastingUnsafe = Literal["unsafe"]

__all__: list[str]

# TODO: Properly handle the `casting`-based combinatorics
# TODO: We need to evaluate the content `__subscripts` in order
# to identify whether or an array or scalar is returned. At a cursory
# glance this seems like something that can quite easily be done with
# a mypy plugin.
# Something like `is_scalar = bool(__subscripts.partition("->")[-1])`
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeBool_co,
    out: None = ...,
    dtype: None | _DTypeLikeBool = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeUInt_co,
    out: None = ...,
    dtype: None | _DTypeLikeUInt = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeInt_co,
    out: None = ...,
    dtype: None | _DTypeLikeInt = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeFloat_co,
    out: None = ...,
    dtype: None | _DTypeLikeFloat = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeComplex_co,
    out: None = ...,
    dtype: None | _DTypeLikeComplex = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: Any,
    casting: _CastingUnsafe,
    dtype: None | _DTypeLikeComplex_co = ...,
    out: None = ...,
    order: _OrderKACF = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeComplex_co,
    out: _ArrayType,
    dtype: None | _DTypeLikeComplex_co = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> _ArrayType: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: Any,
    out: _ArrayType,
    casting: _CastingUnsafe,
    dtype: None | _DTypeLikeComplex_co = ...,
    order: _OrderKACF = ...,
    optimize: _OptimizeKind = ...,
) -> _ArrayType: ...

@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeObject_co,
    out: None = ...,
    dtype: None | _DTypeLikeObject = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: Any,
    casting: _CastingUnsafe,
    dtype: None | _DTypeLikeObject = ...,
    out: None = ...,
    order: _OrderKACF = ...,
    optimize: _OptimizeKind = ...,
) -> Any: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeObject_co,
    out: _ArrayType,
    dtype: None | _DTypeLikeObject = ...,
    order: _OrderKACF = ...,
    casting: _CastingSafe = ...,
    optimize: _OptimizeKind = ...,
) -> _ArrayType: ...
@overload
def einsum(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: Any,
    out: _ArrayType,
    casting: _CastingUnsafe,
    dtype: None | _DTypeLikeObject = ...,
    order: _OrderKACF = ...,
    optimize: _OptimizeKind = ...,
) -> _ArrayType: ...

# NOTE: `einsum_call` is a hidden kwarg unavailable for public use.
# It is therefore excluded from the signatures below.
# NOTE: In practice the list consists of a `str` (first element)
# and a variable number of integer tuples.
def einsum_path(
    subscripts: str | _ArrayLikeInt_co,
    /,
    *operands: _ArrayLikeComplex_co | _DTypeLikeObject,
    optimize: _OptimizeKind = ...,
) -> tuple[list[Any], str]: ...

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