cast.py

"""
Routines for casting.
"""

from __future__ import annotations

from datetime import (
    date,
    datetime,
    timedelta,
)
import functools
import inspect
from typing import (
    TYPE_CHECKING,
    Any,
    Sized,
    TypeVar,
    cast,
    overload,
)
import warnings

from dateutil.parser import ParserError
import numpy as np

from pandas._libs import lib
from pandas._libs.tslibs import (
    NaT,
    OutOfBoundsDatetime,
    OutOfBoundsTimedelta,
    Timedelta,
    Timestamp,
    astype_overflowsafe,
)
from pandas._libs.tslibs.timedeltas import array_to_timedelta64
from pandas._typing import (
    ArrayLike,
    Dtype,
    DtypeObj,
    Scalar,
)
from pandas.errors import IntCastingNaNError
from pandas.util._exceptions import find_stack_level
from pandas.util._validators import validate_bool_kwarg

from pandas.core.dtypes.astype import astype_nansafe
from pandas.core.dtypes.common import (
    DT64NS_DTYPE,
    TD64NS_DTYPE,
    ensure_int8,
    ensure_int16,
    ensure_int32,
    ensure_int64,
    ensure_object,
    ensure_str,
    is_bool,
    is_bool_dtype,
    is_complex,
    is_complex_dtype,
    is_datetime64_dtype,
    is_datetime64tz_dtype,
    is_dtype_equal,
    is_extension_array_dtype,
    is_float,
    is_float_dtype,
    is_integer,
    is_integer_dtype,
    is_numeric_dtype,
    is_object_dtype,
    is_scalar,
    is_string_dtype,
    is_timedelta64_dtype,
    is_unsigned_integer_dtype,
    pandas_dtype,
)
from pandas.core.dtypes.dtypes import (
    CategoricalDtype,
    DatetimeTZDtype,
    ExtensionDtype,
    IntervalDtype,
    PeriodDtype,
)
from pandas.core.dtypes.generic import (
    ABCExtensionArray,
    ABCIndex,
    ABCSeries,
)
from pandas.core.dtypes.inference import is_list_like
from pandas.core.dtypes.missing import (
    array_equivalent,
    is_valid_na_for_dtype,
    isna,
    na_value_for_dtype,
    notna,
)

if TYPE_CHECKING:

    from pandas import Index
    from pandas.core.arrays import (
        Categorical,
        DatetimeArray,
        ExtensionArray,
        IntervalArray,
        PeriodArray,
        TimedeltaArray,
    )


_int8_max = np.iinfo(np.int8).max
_int16_max = np.iinfo(np.int16).max
_int32_max = np.iinfo(np.int32).max
_int64_max = np.iinfo(np.int64).max

_dtype_obj = np.dtype(object)

NumpyArrayT = TypeVar("NumpyArrayT", bound=np.ndarray)


def maybe_convert_platform(
    values: list | tuple | range | np.ndarray | ExtensionArray,
) -> ArrayLike:
    """try to do platform conversion, allow ndarray or list here"""
    arr: ArrayLike

    if isinstance(values, (list, tuple, range)):
        arr = construct_1d_object_array_from_listlike(values)
    else:
        # The caller is responsible for ensuring that we have np.ndarray
        #  or ExtensionArray here.
        arr = values

    if arr.dtype == _dtype_obj:
        arr = cast(np.ndarray, arr)
        arr = lib.maybe_convert_objects(arr)

    return arr


def is_nested_object(obj) -> bool:
    """
    return a boolean if we have a nested object, e.g. a Series with 1 or
    more Series elements

    This may not be necessarily be performant.

    """
    return bool(
        isinstance(obj, ABCSeries)
        and is_object_dtype(obj.dtype)
        and any(isinstance(v, ABCSeries) for v in obj._values)
    )


def maybe_box_datetimelike(value: Scalar, dtype: Dtype | None = None) -> Scalar:
    """
    Cast scalar to Timestamp or Timedelta if scalar is datetime-like
    and dtype is not object.

    Parameters
    ----------
    value : scalar
    dtype : Dtype, optional

    Returns
    -------
    scalar
    """
    if dtype == _dtype_obj:
        pass
    elif isinstance(value, (np.datetime64, datetime)):
        value = Timestamp(value)
    elif isinstance(value, (np.timedelta64, timedelta)):
        value = Timedelta(value)

    return value


def maybe_box_native(value: Scalar) -> Scalar:
    """
    If passed a scalar cast the scalar to a python native type.

    Parameters
    ----------
    value : scalar or Series

    Returns
    -------
    scalar or Series
    """
    if is_float(value):
        # error: Argument 1 to "float" has incompatible type
        # "Union[Union[str, int, float, bool], Union[Any, Timestamp, Timedelta, Any]]";
        # expected "Union[SupportsFloat, _SupportsIndex, str]"
        value = float(value)  # type: ignore[arg-type]
    elif is_integer(value):
        # error: Argument 1 to "int" has incompatible type
        # "Union[Union[str, int, float, bool], Union[Any, Timestamp, Timedelta, Any]]";
        # expected "Union[str, SupportsInt, _SupportsIndex, _SupportsTrunc]"
        value = int(value)  # type: ignore[arg-type]
    elif is_bool(value):
        value = bool(value)
    elif isinstance(value, (np.datetime64, np.timedelta64)):
        value = maybe_box_datetimelike(value)
    return value


def _maybe_unbox_datetimelike(value: Scalar, dtype: DtypeObj) -> Scalar:
    """
    Convert a Timedelta or Timestamp to timedelta64 or datetime64 for setting
    into a numpy array.  Failing to unbox would risk dropping nanoseconds.

    Notes
    -----
    Caller is responsible for checking dtype.kind in ["m", "M"]
    """
    if is_valid_na_for_dtype(value, dtype):
        # GH#36541: can't fill array directly with pd.NaT
        # > np.empty(10, dtype="datetime64[64]").fill(pd.NaT)
        # ValueError: cannot convert float NaN to integer
        value = dtype.type("NaT", "ns")
    elif isinstance(value, Timestamp):
        if value.tz is None:
            value = value.to_datetime64()
        elif not isinstance(dtype, DatetimeTZDtype):
            raise TypeError("Cannot unbox tzaware Timestamp to tznaive dtype")
    elif isinstance(value, Timedelta):
        value = value.to_timedelta64()

    _disallow_mismatched_datetimelike(value, dtype)
    return value


def _disallow_mismatched_datetimelike(value, dtype: DtypeObj):
    """
    numpy allows np.array(dt64values, dtype="timedelta64[ns]") and
    vice-versa, but we do not want to allow this, so we need to
    check explicitly
    """
    vdtype = getattr(value, "dtype", None)
    if vdtype is None:
        return
    elif (vdtype.kind == "m" and dtype.kind == "M") or (
        vdtype.kind == "M" and dtype.kind == "m"
    ):
        raise TypeError(f"Cannot cast {repr(value)} to {dtype}")


@overload
def maybe_downcast_to_dtype(result: np.ndarray, dtype: str | np.dtype) -> np.ndarray:
    ...


@overload
def maybe_downcast_to_dtype(result: ExtensionArray, dtype: str | np.dtype) -> ArrayLike:
    ...


def maybe_downcast_to_dtype(result: ArrayLike, dtype: str | np.dtype) -> ArrayLike:
    """
    try to cast to the specified dtype (e.g. convert back to bool/int
    or could be an astype of float64->float32
    """
    do_round = False

    if isinstance(dtype, str):
        if dtype == "infer":
            inferred_type = lib.infer_dtype(result, skipna=False)
            if inferred_type == "boolean":
                dtype = "bool"
            elif inferred_type == "integer":
                dtype = "int64"
            elif inferred_type == "datetime64":
                dtype = "datetime64[ns]"
            elif inferred_type in ["timedelta", "timedelta64"]:
                dtype = "timedelta64[ns]"

            # try to upcast here
            elif inferred_type == "floating":
                dtype = "int64"
                if issubclass(result.dtype.type, np.number):
                    do_round = True

            else:
                # TODO: complex?  what if result is already non-object?
                dtype = "object"

        dtype = np.dtype(dtype)

    if not isinstance(dtype, np.dtype):
        # enforce our signature annotation
        raise TypeError(dtype)  # pragma: no cover

    converted = maybe_downcast_numeric(result, dtype, do_round)
    if converted is not result:
        return converted

    # a datetimelike
    # GH12821, iNaT is cast to float
    if dtype.kind in ["M", "m"] and result.dtype.kind in ["i", "f"]:
        result = result.astype(dtype)

    elif dtype.kind == "m" and result.dtype == _dtype_obj:
        # test_where_downcast_to_td64
        result = cast(np.ndarray, result)
        result = array_to_timedelta64(result)

    elif dtype == np.dtype("M8[ns]") and result.dtype == _dtype_obj:
        return np.asarray(maybe_cast_to_datetime(result, dtype=dtype))

    return result


@overload
def maybe_downcast_numeric(
    result: np.ndarray, dtype: np.dtype, do_round: bool = False
) -> np.ndarray:
    ...


@overload
def maybe_downcast_numeric(
    result: ExtensionArray, dtype: DtypeObj, do_round: bool = False
) -> ArrayLike:
    ...


def maybe_downcast_numeric(
    result: ArrayLike, dtype: DtypeObj, do_round: bool = False
) -> ArrayLike:
    """
    Subset of maybe_downcast_to_dtype restricted to numeric dtypes.

    Parameters
    ----------
    result : ndarray or ExtensionArray
    dtype : np.dtype or ExtensionDtype
    do_round : bool

    Returns
    -------
    ndarray or ExtensionArray
    """
    if not isinstance(dtype, np.dtype) or not isinstance(result.dtype, np.dtype):
        # e.g. SparseDtype has no itemsize attr
        return result

    def trans(x):
        if do_round:
            return x.round()
        return x

    if dtype.kind == result.dtype.kind:
        # don't allow upcasts here (except if empty)
        if result.dtype.itemsize <= dtype.itemsize and result.size:
            return result

    if is_bool_dtype(dtype) or is_integer_dtype(dtype):

        if not result.size:
            # if we don't have any elements, just astype it
            return trans(result).astype(dtype)

        # do a test on the first element, if it fails then we are done
        r = result.ravel()
        arr = np.array([r[0]])

        if isna(arr).any():
            # if we have any nulls, then we are done
            return result

        elif not isinstance(r[0], (np.integer, np.floating, int, float, bool)):
            # a comparable, e.g. a Decimal may slip in here
            return result

        if (
            issubclass(result.dtype.type, (np.object_, np.number))
            and notna(result).all()
        ):
            new_result = trans(result).astype(dtype)
            if new_result.dtype.kind == "O" or result.dtype.kind == "O":
                # np.allclose may raise TypeError on object-dtype
                if (new_result == result).all():
                    return new_result
            else:
                if np.allclose(new_result, result, rtol=0):
                    return new_result

    elif (
        issubclass(dtype.type, np.floating)
        and not is_bool_dtype(result.dtype)
        and not is_string_dtype(result.dtype)
    ):
        new_result = result.astype(dtype)

        # Adjust tolerances based on floating point size
        size_tols = {4: 5e-4, 8: 5e-8, 16: 5e-16}

        atol = size_tols.get(new_result.dtype.itemsize, 0.0)

        # Check downcast float values are still equal within 7 digits when
        # converting from float64 to float32
        if np.allclose(new_result, result, equal_nan=True, rtol=0.0, atol=atol):
            return new_result

    elif dtype.kind == result.dtype.kind == "c":
        new_result = result.astype(dtype)

        if array_equivalent(new_result, result):
            # TODO: use tolerance like we do for float?
            return new_result

    return result


def maybe_cast_pointwise_result(
    result: ArrayLike,
    dtype: DtypeObj,
    numeric_only: bool = False,
    same_dtype: bool = True,
) -> ArrayLike:
    """
    Try casting result of a pointwise operation back to the original dtype if
    appropriate.

    Parameters
    ----------
    result : array-like
        Result to cast.
    dtype : np.dtype or ExtensionDtype
        Input Series from which result was calculated.
    numeric_only : bool, default False
        Whether to cast only numerics or datetimes as well.
    same_dtype : bool, default True
        Specify dtype when calling _from_sequence

    Returns
    -------
    result : array-like
        result maybe casted to the dtype.
    """

    assert not is_scalar(result)

    if isinstance(dtype, ExtensionDtype):
        if not isinstance(dtype, (CategoricalDtype, DatetimeTZDtype)):
            # TODO: avoid this special-casing
            # We have to special case categorical so as not to upcast
            # things like counts back to categorical

            cls = dtype.construct_array_type()
            if same_dtype:
                result = maybe_cast_to_extension_array(cls, result, dtype=dtype)
            else:
                result = maybe_cast_to_extension_array(cls, result)

    elif (numeric_only and is_numeric_dtype(dtype)) or not numeric_only:
        result = maybe_downcast_to_dtype(result, dtype)

    return result


def maybe_cast_to_extension_array(
    cls: type[ExtensionArray], obj: ArrayLike, dtype: ExtensionDtype | None = None
) -> ArrayLike:
    """
    Call to `_from_sequence` that returns the object unchanged on Exception.

    Parameters
    ----------
    cls : class, subclass of ExtensionArray
    obj : arraylike
        Values to pass to cls._from_sequence
    dtype : ExtensionDtype, optional

    Returns
    -------
    ExtensionArray or obj
    """
    from pandas.core.arrays.string_ import BaseStringArray

    assert isinstance(cls, type), f"must pass a type: {cls}"
    assertion_msg = f"must pass a subclass of ExtensionArray: {cls}"
    assert issubclass(cls, ABCExtensionArray), assertion_msg

    # Everything can be converted to StringArrays, but we may not want to convert
    if issubclass(cls, BaseStringArray) and lib.infer_dtype(obj) != "string":
        return obj

    try:
        result = cls._from_sequence(obj, dtype=dtype)
    except Exception:
        # We can't predict what downstream EA constructors may raise
        result = obj
    return result


@overload
def ensure_dtype_can_hold_na(dtype: np.dtype) -> np.dtype:
    ...


@overload
def ensure_dtype_can_hold_na(dtype: ExtensionDtype) -> ExtensionDtype:
    ...


def ensure_dtype_can_hold_na(dtype: DtypeObj) -> DtypeObj:
    """
    If we have a dtype that cannot hold NA values, find the best match that can.
    """
    if isinstance(dtype, ExtensionDtype):
        if dtype._can_hold_na:
            return dtype
        elif isinstance(dtype, IntervalDtype):
            # TODO(GH#45349): don't special-case IntervalDtype, allow
            #  overriding instead of returning object below.
            return IntervalDtype(np.float64, closed=dtype.closed)
        return _dtype_obj
    elif dtype.kind == "b":
        return _dtype_obj
    elif dtype.kind in ["i", "u"]:
        return np.dtype(np.float64)
    return dtype


def maybe_promote(dtype: np.dtype, fill_value=np.nan):
    """
    Find the minimal dtype that can hold both the given dtype and fill_value.

    Parameters
    ----------
    dtype : np.dtype
    fill_value : scalar, default np.nan

    Returns
    -------
    dtype
        Upcasted from dtype argument if necessary.
    fill_value
        Upcasted from fill_value argument if necessary.

    Raises
    ------
    ValueError
        If fill_value is a non-scalar and dtype is not object.
    """
    # TODO(2.0): need to directly use the non-cached version as long as we
    # possibly raise a deprecation warning for datetime dtype
    if dtype.kind == "M":
        return _maybe_promote(dtype, fill_value)
    # for performance, we are using a cached version of the actual implementation
    # of the function in _maybe_promote. However, this doesn't always work (in case
    # of non-hashable arguments), so we fallback to the actual implementation if needed
    try:
        # error: Argument 3 to "__call__" of "_lru_cache_wrapper" has incompatible type
        # "Type[Any]"; expected "Hashable"  [arg-type]
        return _maybe_promote_cached(
            dtype, fill_value, type(fill_value)  # type: ignore[arg-type]
        )
    except TypeError:
        # if fill_value is not hashable (required for caching)
        return _maybe_promote(dtype, fill_value)


@functools.lru_cache(maxsize=128)
def _maybe_promote_cached(dtype, fill_value, fill_value_type):
    # The cached version of _maybe_promote below
    # This also use fill_value_type as (unused) argument to use this in the
    # cache lookup -> to differentiate 1 and True
    return _maybe_promote(dtype, fill_value)


def _maybe_promote(dtype: np.dtype, fill_value=np.nan):
    # The actual implementation of the function, use `maybe_promote` above for
    # a cached version.
    if not is_scalar(fill_value):
        # with object dtype there is nothing to promote, and the user can
        #  pass pretty much any weird fill_value they like
        if not is_object_dtype(dtype):
            # with object dtype there is nothing to promote, and the user can
            #  pass pretty much any weird fill_value they like
            raise ValueError("fill_value must be a scalar")
        dtype = _dtype_obj
        return dtype, fill_value

    kinds = ["i", "u", "f", "c", "m", "M"]
    if is_valid_na_for_dtype(fill_value, dtype) and dtype.kind in kinds:
        dtype = ensure_dtype_can_hold_na(dtype)
        fv = na_value_for_dtype(dtype)
        return dtype, fv

    elif isinstance(dtype, CategoricalDtype):
        if fill_value in dtype.categories or isna(fill_value):
            return dtype, fill_value
        else:
            return object, ensure_object(fill_value)

    elif isna(fill_value):
        dtype = _dtype_obj
        if fill_value is None:
            # but we retain e.g. pd.NA
            fill_value = np.nan
        return dtype, fill_value

    # returns tuple of (dtype, fill_value)
    if issubclass(dtype.type, np.datetime64):
        inferred, fv = infer_dtype_from_scalar(fill_value, pandas_dtype=True)
        if inferred == dtype:
            return dtype, fv

        # TODO(2.0): once this deprecation is enforced, this whole case
        # becomes equivalent to:
        #  dta = DatetimeArray._from_sequence([], dtype="M8[ns]")
        #  try:
        #      fv = dta._validate_setitem_value(fill_value)
        #      return dta.dtype, fv
        #  except (ValueError, TypeError):
        #      return _dtype_obj, fill_value
        if isinstance(fill_value, date) and not isinstance(fill_value, datetime):
            # deprecate casting of date object to match infer_dtype_from_scalar
            #  and DatetimeArray._validate_setitem_value
            try:
                fv = Timestamp(fill_value).to_datetime64()
            except OutOfBoundsDatetime:
                pass
            else:
                warnings.warn(
                    "Using a `date` object for fill_value with `datetime64[ns]` "
                    "dtype is deprecated. In a future version, this will be cast "
                    "to object dtype. Pass `fill_value=Timestamp(date_obj)` instead.",
                    FutureWarning,
                    stacklevel=find_stack_level(inspect.currentframe()),
                )
                return dtype, fv
        elif isinstance(fill_value, str):
            try:
                # explicitly wrap in str to convert np.str_
                fv = Timestamp(str(fill_value))
            except (ValueError, TypeError):
                pass
            else:
                if isna(fv) or fv.tz is None:
                    return dtype, fv.asm8

        return np.dtype("object"), fill_value

    elif issubclass(dtype.type, np.timedelta64):
        inferred, fv = infer_dtype_from_scalar(fill_value, pandas_dtype=True)
        if inferred == dtype:
            return dtype, fv

        return np.dtype("object"), fill_value

    elif is_float(fill_value):
        if issubclass(dtype.type, np.bool_):
            dtype = np.dtype(np.object_)

        elif issubclass(dtype.type, np.integer):
            dtype = np.dtype(np.float64)

        elif dtype.kind == "f":
            mst = np.min_scalar_type(fill_value)
            if mst > dtype:
                # e.g. mst is np.float64 and dtype is np.float32
                dtype = mst

        elif dtype.kind == "c":
            mst = np.min_scalar_type(fill_value)
            dtype = np.promote_types(dtype, mst)

    elif is_bool(fill_value):
        if not issubclass(dtype.type, np.bool_):
            dtype = np.dtype(np.object_)

    elif is_integer(fill_value):
        if issubclass(dtype.type, np.bool_):
            dtype = np.dtype(np.object_)

        elif issubclass(dtype.type, np.integer):
            if not np.can_cast(fill_value, dtype):
                # upcast to prevent overflow
                mst = np.min_scalar_type(fill_value)
                dtype = np.promote_types(dtype, mst)
                if dtype.kind == "f":
                    # Case where we disagree with numpy
                    dtype = np.dtype(np.object_)

    elif is_complex(fill_value):
        if issubclass(dtype.type, np.bool_):
            dtype = np.dtype(np.object_)

        elif issubclass(dtype.type, (np.integer, np.floating)):
            mst = np.min_scalar_type(fill_value)
            dtype = np.promote_types(dtype, mst)

        elif dtype.kind == "c":
            mst = np.min_scalar_type(fill_value)
            if mst > dtype:
                # e.g. mst is np.complex128 and dtype is np.complex64
                dtype = mst

    else:
        dtype = np.dtype(np.object_)

    # in case we have a string that looked like a number
    if issubclass(dtype.type, (bytes, str)):
        dtype = np.dtype(np.object_)

    fill_value = _ensure_dtype_type(fill_value, dtype)
    return dtype, fill_value


def _ensure_dtype_type(value, dtype: np.dtype):
    """
    Ensure that the given value is an instance of the given dtype.

    e.g. if out dtype is np.complex64_, we should have an instance of that
    as opposed to a python complex object.

    Parameters
    ----------
    value : object
    dtype : np.dtype

    Returns
    -------
    object
    """
    # Start with exceptions in which we do _not_ cast to numpy types

    if dtype == _dtype_obj:
        return value

    # Note: before we get here we have already excluded isna(value)
    return dtype.type(value)


def infer_dtype_from(val, pandas_dtype: bool = False) -> tuple[DtypeObj, Any]:
    """
    Interpret the dtype from a scalar or array.

    Parameters
    ----------
    val : object
    pandas_dtype : bool, default False
        whether to infer dtype including pandas extension types.
        If False, scalar/array belongs to pandas extension types is inferred as
        object
    """
    if not is_list_like(val):
        return infer_dtype_from_scalar(val, pandas_dtype=pandas_dtype)
    return infer_dtype_from_array(val, pandas_dtype=pandas_dtype)


def infer_dtype_from_scalar(val, pandas_dtype: bool = False) -> tuple[DtypeObj, Any]:
    """
    Interpret the dtype from a scalar.

    Parameters
    ----------
    pandas_dtype : bool, default False
        whether to infer dtype including pandas extension types.
        If False, scalar belongs to pandas extension types is inferred as
        object
    """
    dtype: DtypeObj = _dtype_obj

    # a 1-element ndarray
    if isinstance(val, np.ndarray):
        if val.ndim != 0:
            msg = "invalid ndarray passed to infer_dtype_from_scalar"
            raise ValueError(msg)

        dtype = val.dtype
        val = lib.item_from_zerodim(val)

    elif isinstance(val, str):

        # If we create an empty array using a string to infer
        # the dtype, NumPy will only allocate one character per entry
        # so this is kind of bad. Alternately we could use np.repeat
        # instead of np.empty (but then you still don't want things
        # coming out as np.str_!

        dtype = _dtype_obj

    elif isinstance(val, (np.datetime64, datetime)):
        try:
            val = Timestamp(val)
        except OutOfBoundsDatetime:
            return _dtype_obj, val

        # error: Non-overlapping identity check (left operand type: "Timestamp",
        # right operand type: "NaTType")
        if val is NaT or val.tz is None:  # type: ignore[comparison-overlap]
            dtype = np.dtype("M8[ns]")
            val = val.to_datetime64()
        else:
            if pandas_dtype:
                dtype = DatetimeTZDtype(unit="ns", tz=val.tz)
            else:
                # return datetimetz as object
                return _dtype_obj, val

    elif isinstance(val, (np.timedelta64, timedelta)):
        try:
            val = Timedelta(val)
        except (OutOfBoundsTimedelta, OverflowError):
            dtype = _dtype_obj
        else:
            dtype = np.dtype("m8[ns]")
            val = np.timedelta64(val.value, "ns")

    elif is_bool(val):
        dtype = np.dtype(np.bool_)

    elif is_integer(val):
        if isinstance(val, np.integer):
            dtype = np.dtype(type(val))
        else:
            dtype = np.dtype(np.int64)

        try:
            np.array(val, dtype=dtype)
        except OverflowError:
            dtype = np.array(val).dtype

    elif is_float(val):
        if isinstance(val, np.floating):
            dtype = np.dtype(type(val))
        else:
            dtype = np.dtype(np.float64)

    elif is_complex(val):
        dtype = np.dtype(np.complex_)

    elif pandas_dtype:
        if lib.is_period(val):
            dtype = PeriodDtype(freq=val.freq)
        elif lib.is_interval(val):
            subtype = infer_dtype_from_scalar(val.left, pandas_dtype=True)[0]
            dtype = IntervalDtype(subtype=subtype, closed=val.closed)

    return dtype, val


def dict_compat(d: dict[Scalar, Scalar]) -> dict[Scalar, Scalar]:
    """
    Convert datetimelike-keyed dicts to a Timestamp-keyed dict.

    Parameters
    ----------
    d: dict-like object

    Returns
    -------
    dict
    """
    return {maybe_box_datetimelike(key): value for key, value in d.items()}


def infer_dtype_from_array(
    arr, pandas_dtype: bool = False
) -> tuple[DtypeObj, ArrayLike]:
    """
    Infer the dtype from an array.

    Parameters
    ----------
    arr : array
    pandas_dtype : bool, default False
        whether to infer dtype including pandas extension types.
        If False, array belongs to pandas extension types
        is inferred as object

    Returns
    -------
    tuple (numpy-compat/pandas-compat dtype, array)

    Notes
    -----
    if pandas_dtype=False. these infer to numpy dtypes
    exactly with the exception that mixed / object dtypes
    are not coerced by stringifying or conversion

    if pandas_dtype=True. datetime64tz-aware/categorical
    types will retain there character.

    Examples
    --------
    >>> np.asarray([1, '1'])
    array(['1', '1'], dtype='<U21')

    >>> infer_dtype_from_array([1, '1'])
    (dtype('O'), [1, '1'])
    """
    if isinstance(arr, np.ndarray):
        return arr.dtype, arr

    if not is_list_like(arr):
        raise TypeError("'arr' must be list-like")

    if pandas_dtype and is_extension_array_dtype(arr):
        return arr.dtype, arr

    elif isinstance(arr, ABCSeries):
        return arr.dtype, np.asarray(arr)

    # don't force numpy coerce with nan's
    inferred = lib.infer_dtype(arr, skipna=False)
    if inferred in ["string", "bytes", "mixed", "mixed-integer"]:
        return (np.dtype(np.object_), arr)

    arr = np.asarray(arr)
    return arr.dtype, arr


def _maybe_infer_dtype_type(element):
    """
    Try to infer an object's dtype, for use in arithmetic ops.

    Uses `element.dtype` if that's available.
    Objects implementing the iterator protocol are cast to a NumPy array,
    and from there the array's type is used.

    Parameters
    ----------
    element : object
        Possibly has a `.dtype` attribute, and possibly the iterator
        protocol.

    Returns
    -------
    tipo : type

    Examples
    --------
    >>> from collections import namedtuple
    >>> Foo = namedtuple("Foo", "dtype")
    >>> _maybe_infer_dtype_type(Foo(np.dtype("i8")))
    dtype('int64')
    """
    tipo = None
    if hasattr(element, "dtype"):
        tipo = element.dtype
    elif is_list_like(element):
        element = np.asarray(element)
        tipo = element.dtype
    return tipo


def maybe_upcast(
    values: NumpyArrayT,
    fill_value: Scalar = np.nan,
    copy: bool = False,
) -> tuple[NumpyArrayT, Scalar]:
    """
    Provide explicit type promotion and coercion.

    Parameters
    ----------
    values : np.ndarray
        The array that we may want to upcast.
    fill_value : what we want to fill with
    copy : bool, default True
        If True always make a copy even if no upcast is required.

    Returns
    -------
    values: np.ndarray
        the original array, possibly upcast
    fill_value:
        the fill value, possibly upcast
    """
    new_dtype, fill_value = maybe_promote(values.dtype, fill_value)
    # We get a copy in all cases _except_ (values.dtype == new_dtype and not copy)
    upcast_values = values.astype(new_dtype, copy=copy)

    # error: Incompatible return value type (got "Tuple[ndarray[Any, dtype[Any]],
    # Union[Union[str, int, float, bool] Union[Period, Timestamp, Timedelta, Any]]]",
    # expected "Tuple[NumpyArrayT, Union[Union[str, int, float, bool], Union[Period,
    # Timestamp, Timedelta, Any]]]")
    return upcast_values, fill_value  # type: ignore[return-value]


def invalidate_string_dtypes(dtype_set: set[DtypeObj]) -> None:
    """
    Change string like dtypes to object for
    ``DataFrame.select_dtypes()``.
    """
    # error: Argument 1 to <set> has incompatible type "Type[generic]"; expected
    # "Union[dtype[Any], ExtensionDtype, None]"
    # error: Argument 2 to <set> has incompatible type "Type[generic]"; expected
    # "Union[dtype[Any], ExtensionDtype, None]"
    non_string_dtypes = dtype_set - {
        np.dtype("S").type,  # type: ignore[arg-type]
        np.dtype("<U").type,  # type: ignore[arg-type]
    }
    if non_string_dtypes != dtype_set:
        raise TypeError("string dtypes are not allowed, use 'object' instead")


def coerce_indexer_dtype(indexer, categories) -> np.ndarray:
    """coerce the indexer input array to the smallest dtype possible"""
    length = len(categories)
    if length < _int8_max:
        return ensure_int8(indexer)
    elif length < _int16_max:
        return ensure_int16(indexer)
    elif length < _int32_max:
        return ensure_int32(indexer)
    return ensure_int64(indexer)


def soft_convert_objects(
    values: np.ndarray,
    datetime: bool = True,
    numeric: bool = True,
    timedelta: bool = True,
    period: bool = True,
    copy: bool = True,
) -> ArrayLike:
    """
    Try to coerce datetime, timedelta, and numeric object-dtype columns
    to inferred dtype.

    Parameters
    ----------
    values : np.ndarray[object]
    datetime : bool, default True
    numeric: bool, default True
    timedelta : bool, default True
    period : bool, default True
    copy : bool, default True

    Returns
    -------
    np.ndarray or ExtensionArray
    """
    validate_bool_kwarg(datetime, "datetime")
    validate_bool_kwarg(numeric, "numeric")
    validate_bool_kwarg(timedelta, "timedelta")
    validate_bool_kwarg(copy, "copy")

    conversion_count = sum((datetime, numeric, timedelta))
    if conversion_count == 0:
        raise ValueError("At least one of datetime, numeric or timedelta must be True.")

    # Soft conversions
    if datetime or timedelta:
        # GH 20380, when datetime is beyond year 2262, hence outside
        # bound of nanosecond-resolution 64-bit integers.
        try:
            converted = lib.maybe_convert_objects(
                values,
                convert_datetime=datetime,
                convert_timedelta=timedelta,
                convert_period=period,
            )
        except (OutOfBoundsDatetime, ValueError):
            return values
        if converted is not values:
            return converted

    if numeric and is_object_dtype(values.dtype):
        converted, _ = lib.maybe_convert_numeric(values, set(), coerce_numeric=True)

        # If all NaNs, then do not-alter
        values = converted if not isna(converted).all() else values
        values = values.copy() if copy else values

    return values


def convert_dtypes(
    input_array: ArrayLike,
    convert_string: bool = True,
    convert_integer: bool = True,
    convert_boolean: bool = True,
    convert_floating: bool = True,
) -> DtypeObj:
    """
    Convert objects to best possible type, and optionally,
    to types supporting ``pd.NA``.

    Parameters
    ----------
    input_array : ExtensionArray or np.ndarray
    convert_string : bool, default True
        Whether object dtypes should be converted to ``StringDtype()``.
    convert_integer : bool, default True
        Whether, if possible, conversion can be done to integer extension types.
    convert_boolean : bool, defaults True
        Whether object dtypes should be converted to ``BooleanDtypes()``.
    convert_floating : bool, defaults True
        Whether, if possible, conversion can be done to floating extension types.
        If `convert_integer` is also True, preference will be give to integer
        dtypes if the floats can be faithfully casted to integers.

    Returns
    -------
    np.dtype, or ExtensionDtype
    """
    inferred_dtype: str | DtypeObj

    if (
        convert_string or convert_integer or convert_boolean or convert_floating
    ) and isinstance(input_array, np.ndarray):

        if is_object_dtype(input_array.dtype):
            inferred_dtype = lib.infer_dtype(input_array)
        else:
            inferred_dtype = input_array.dtype

        if is_string_dtype(inferred_dtype):
            if not convert_string or inferred_dtype == "bytes":
                return input_array.dtype
            else:
                return pandas_dtype("string")

        if convert_integer:
            target_int_dtype = pandas_dtype("Int64")

            if is_integer_dtype(input_array.dtype):
                from pandas.core.arrays.integer import INT_STR_TO_DTYPE

                inferred_dtype = INT_STR_TO_DTYPE.get(
                    input_array.dtype.name, target_int_dtype
                )
            elif is_numeric_dtype(input_array.dtype):
                # TODO: de-dup with maybe_cast_to_integer_array?
                arr = input_array[notna(input_array)]
                if (arr.astype(int) == arr).all():
                    inferred_dtype = target_int_dtype
                else:
                    inferred_dtype = input_array.dtype

        if convert_floating:
            if not is_integer_dtype(input_array.dtype) and is_numeric_dtype(
                input_array.dtype
            ):
                from pandas.core.arrays.floating import FLOAT_STR_TO_DTYPE

                inferred_float_dtype: DtypeObj = FLOAT_STR_TO_DTYPE.get(
                    input_array.dtype.name, pandas_dtype("Float64")
                )
                # if we could also convert to integer, check if all floats
                # are actually integers
                if convert_integer:
                    # TODO: de-dup with maybe_cast_to_integer_array?
                    arr = input_array[notna(input_array)]
                    if (arr.astype(int) == arr).all():
                        inferred_dtype = pandas_dtype("Int64")
                    else:
                        inferred_dtype = inferred_float_dtype
                else:
                    inferred_dtype = inferred_float_dtype

        if convert_boolean:
            if is_bool_dtype(input_array.dtype):
                inferred_dtype = pandas_dtype("boolean")
            elif isinstance(inferred_dtype, str) and inferred_dtype == "boolean":
                inferred_dtype = pandas_dtype("boolean")

        if isinstance(inferred_dtype, str):
            # If we couldn't do anything else, then we retain the dtype
            inferred_dtype = input_array.dtype

    else:
        return input_array.dtype

    # error: Incompatible return value type (got "Union[str, Union[dtype[Any],
    # ExtensionDtype]]", expected "Union[dtype[Any], ExtensionDtype]")
    return inferred_dtype  # type: ignore[return-value]


def maybe_infer_to_datetimelike(
    value: np.ndarray,
) -> np.ndarray | DatetimeArray | TimedeltaArray | PeriodArray | IntervalArray:
    """
    we might have a array (or single object) that is datetime like,
    and no dtype is passed don't change the value unless we find a
    datetime/timedelta set

    this is pretty strict in that a datetime/timedelta is REQUIRED
    in addition to possible nulls/string likes

    Parameters
    ----------
    value : np.ndarray[object]

    Returns
    -------
    np.ndarray, DatetimeArray, TimedeltaArray, PeriodArray, or IntervalArray

    """
    if not isinstance(value, np.ndarray) or value.dtype != object:
        # Caller is responsible for passing only ndarray[object]
        raise TypeError(type(value))  # pragma: no cover

    v = np.array(value, copy=False)

    shape = v.shape
    if v.ndim != 1:
        v = v.ravel()

    if not len(v):
        return value

    def try_datetime(v: np.ndarray) -> ArrayLike:
        # Coerce to datetime64, datetime64tz, or in corner cases
        #  object[datetimes]
        from pandas.core.arrays.datetimes import sequence_to_datetimes

        try:
            # GH#19671 we pass require_iso8601 to be relatively strict
            #  when parsing strings.
            dta = sequence_to_datetimes(v, require_iso8601=True)
        except (ValueError, TypeError):
            # e.g. <class 'numpy.timedelta64'> is not convertible to datetime
            return v.reshape(shape)
        else:
            # GH#19761 we may have mixed timezones, in which cast 'dta' is
            #  an ndarray[object].  Only 1 test
            #  relies on this behavior, see GH#40111
            return dta.reshape(shape)

    def try_timedelta(v: np.ndarray) -> np.ndarray:
        # safe coerce to timedelta64

        # will try first with a string & object conversion
        try:
            # bc we know v.dtype == object, this is equivalent to
            #  `np.asarray(to_timedelta(v))`, but using a lower-level API that
            #  does not require a circular import.
            td_values = array_to_timedelta64(v).view("m8[ns]")
        except (ValueError, OverflowError):
            return v.reshape(shape)
        else:
            return td_values.reshape(shape)

    inferred_type, seen_str = lib.infer_datetimelike_array(ensure_object(v))
    if inferred_type in ["period", "interval"]:
        # Incompatible return value type (got "Union[ExtensionArray, ndarray]",
        # expected "Union[ndarray, DatetimeArray, TimedeltaArray, PeriodArray,
        # IntervalArray]")
        return lib.maybe_convert_objects(  # type: ignore[return-value]
            v, convert_period=True, convert_interval=True
        )

    if inferred_type == "datetime":
        # error: Incompatible types in assignment (expression has type "ExtensionArray",
        # variable has type "Union[ndarray, List[Any]]")
        value = try_datetime(v)  # type: ignore[assignment]
    elif inferred_type == "timedelta":
        value = try_timedelta(v)
    elif inferred_type == "nat":

        # if all NaT, return as datetime
        if isna(v).all():
            # error: Incompatible types in assignment (expression has type
            # "ExtensionArray", variable has type "Union[ndarray, List[Any]]")
            value = try_datetime(v)  # type: ignore[assignment]
        else:

            # We have at least a NaT and a string
            # try timedelta first to avoid spurious datetime conversions
            # e.g. '00:00:01' is a timedelta but technically is also a datetime
            value = try_timedelta(v)
            if lib.infer_dtype(value, skipna=False) in ["mixed"]:
                # cannot skip missing values, as NaT implies that the string
                # is actually a datetime

                # error: Incompatible types in assignment (expression has type
                # "ExtensionArray", variable has type "Union[ndarray, List[Any]]")
                value = try_datetime(v)  # type: ignore[assignment]

    if value.dtype.kind in ["m", "M"] and seen_str:
        # TODO(2.0): enforcing this deprecation should close GH#40111
        warnings.warn(
            f"Inferring {value.dtype} from data containing strings is deprecated "
            "and will be removed in a future version. To retain the old behavior "
            f"explicitly pass Series(data, dtype={value.dtype})",
            FutureWarning,
            stacklevel=find_stack_level(inspect.currentframe()),
        )
    return value


def maybe_cast_to_datetime(
    value: ExtensionArray | np.ndarray | list, dtype: DtypeObj | None
) -> ExtensionArray | np.ndarray:
    """
    try to cast the array/value to a datetimelike dtype, converting float
    nan to iNaT

    We allow a list *only* when dtype is not None.
    """
    from pandas.core.arrays.datetimes import sequence_to_datetimes
    from pandas.core.arrays.timedeltas import TimedeltaArray

    if not is_list_like(value):
        raise TypeError("value must be listlike")

    if is_timedelta64_dtype(dtype):
        # TODO: _from_sequence would raise ValueError in cases where
        #  _ensure_nanosecond_dtype raises TypeError
        dtype = cast(np.dtype, dtype)
        dtype = _ensure_nanosecond_dtype(dtype)
        res = TimedeltaArray._from_sequence(value, dtype=dtype)
        return res

    if dtype is not None:
        is_datetime64 = is_datetime64_dtype(dtype)
        is_datetime64tz = is_datetime64tz_dtype(dtype)

        vdtype = getattr(value, "dtype", None)

        if is_datetime64 or is_datetime64tz:
            dtype = _ensure_nanosecond_dtype(dtype)

            value = np.array(value, copy=False)

            # we have an array of datetime or timedeltas & nulls
            if value.size or not is_dtype_equal(value.dtype, dtype):
                _disallow_mismatched_datetimelike(value, dtype)

                try:
                    if is_datetime64:
                        dta = sequence_to_datetimes(value)
                        # GH 25843: Remove tz information since the dtype
                        # didn't specify one

                        if dta.tz is not None:
                            warnings.warn(
                                "Data is timezone-aware. Converting "
                                "timezone-aware data to timezone-naive by "
                                "passing dtype='datetime64[ns]' to "
                                "DataFrame or Series is deprecated and will "
                                "raise in a future version. Use "
                                "`pd.Series(values).dt.tz_localize(None)` "
                                "instead.",
                                FutureWarning,
                                stacklevel=find_stack_level(inspect.currentframe()),
                            )
                            # equiv: dta.view(dtype)
                            # Note: NOT equivalent to dta.astype(dtype)
                            dta = dta.tz_localize(None)

                        value = dta
                    elif is_datetime64tz:
                        dtype = cast(DatetimeTZDtype, dtype)
                        # The string check can be removed once issue #13712
                        # is solved. String data that is passed with a
                        # datetime64tz is assumed to be naive which should
                        # be localized to the timezone.
                        is_dt_string = is_string_dtype(value.dtype)
                        dta = sequence_to_datetimes(value)
                        if dta.tz is not None:
                            value = dta.astype(dtype, copy=False)
                        elif is_dt_string:
                            # Strings here are naive, so directly localize
                            # equiv: dta.astype(dtype)  # though deprecated

                            value = dta.tz_localize(dtype.tz)
                        else:
                            # Numeric values are UTC at this point,
                            # so localize and convert
                            # equiv: Series(dta).astype(dtype) # though deprecated
                            if getattr(vdtype, "kind", None) == "M":
                                # GH#24559, GH#33401 deprecate behavior inconsistent
                                #  with DatetimeArray/DatetimeIndex
                                warnings.warn(
                                    "In a future version, constructing a Series "
                                    "from datetime64[ns] data and a "
                                    "DatetimeTZDtype will interpret the data "
                                    "as wall-times instead of "
                                    "UTC times, matching the behavior of "
                                    "DatetimeIndex. To treat the data as UTC "
                                    "times, use pd.Series(data).dt"
                                    ".tz_localize('UTC').tz_convert(dtype.tz) "
                                    "or pd.Series(data.view('int64'), dtype=dtype)",
                                    FutureWarning,
                                    stacklevel=find_stack_level(inspect.currentframe()),
                                )

                            value = dta.tz_localize("UTC").tz_convert(dtype.tz)
                except OutOfBoundsDatetime:
                    raise
                except ParserError:
                    # Note: this is dateutil's ParserError, not ours.
                    pass

        elif getattr(vdtype, "kind", None) in ["m", "M"]:
            # we are already datetimelike and want to coerce to non-datetimelike;
            #  astype_nansafe will raise for anything other than object, then upcast.
            #  see test_datetimelike_values_with_object_dtype
            # error: Argument 2 to "astype_nansafe" has incompatible type
            # "Union[dtype[Any], ExtensionDtype]"; expected "dtype[Any]"
            return astype_nansafe(value, dtype)  # type: ignore[arg-type]

    elif isinstance(value, np.ndarray):
        if value.dtype.kind in ["M", "m"]:
            # catch a datetime/timedelta that is not of ns variety
            # and no coercion specified
            value = sanitize_to_nanoseconds(value)

        elif value.dtype == _dtype_obj:
            value = maybe_infer_to_datetimelike(value)

    elif isinstance(value, list):
        # we only get here with dtype=None, which we do not allow
        raise ValueError(
            "maybe_cast_to_datetime allows a list *only* if dtype is not None"
        )

    # at this point we have converted or raised in all cases where we had a list
    return cast(ArrayLike, value)


def sanitize_to_nanoseconds(values: np.ndarray, copy: bool = False) -> np.ndarray:
    """
    Safely convert non-nanosecond datetime64 or timedelta64 values to nanosecond.
    """
    dtype = values.dtype
    if dtype.kind == "M" and dtype != DT64NS_DTYPE:
        values = astype_overflowsafe(values, dtype=DT64NS_DTYPE)

    elif dtype.kind == "m" and dtype != TD64NS_DTYPE:
        values = astype_overflowsafe(values, dtype=TD64NS_DTYPE)

    elif copy:
        values = values.copy()

    return values


def _ensure_nanosecond_dtype(dtype: DtypeObj) -> DtypeObj:
    """
    Convert dtypes with granularity less than nanosecond to nanosecond

    >>> _ensure_nanosecond_dtype(np.dtype("M8[s]"))
    dtype('<M8[ns]')

    >>> _ensure_nanosecond_dtype(np.dtype("m8[ps]"))
    Traceback (most recent call last):
        ...
    TypeError: cannot convert timedeltalike to dtype [timedelta64[ps]]
    """
    msg = (
        f"The '{dtype.name}' dtype has no unit. "
        f"Please pass in '{dtype.name}[ns]' instead."
    )

    # unpack e.g. SparseDtype
    dtype = getattr(dtype, "subtype", dtype)

    if not isinstance(dtype, np.dtype):
        # i.e. datetime64tz
        pass

    elif dtype.kind == "M" and dtype != DT64NS_DTYPE:
        # pandas supports dtype whose granularity is less than [ns]
        # e.g., [ps], [fs], [as]
        if dtype <= np.dtype("M8[ns]"):
            if dtype.name == "datetime64":
                raise ValueError(msg)
            dtype = DT64NS_DTYPE
        else:
            raise TypeError(f"cannot convert datetimelike to dtype [{dtype}]")

    elif dtype.kind == "m" and dtype != TD64NS_DTYPE:
        # pandas supports dtype whose granularity is less than [ns]
        # e.g., [ps], [fs], [as]
        if dtype <= np.dtype("m8[ns]"):
            if dtype.name == "timedelta64":
                raise ValueError(msg)
            dtype = TD64NS_DTYPE
        else:
            raise TypeError(f"cannot convert timedeltalike to dtype [{dtype}]")
    return dtype


# TODO: other value-dependent functions to standardize here include
#  dtypes.concat.cast_to_common_type and Index._find_common_type_compat
def find_result_type(left: ArrayLike, right: Any) -> DtypeObj:
    """
    Find the type/dtype for a the result of an operation between these objects.

    This is similar to find_common_type, but looks at the objects instead
    of just their dtypes. This can be useful in particular when one of the
    objects does not have a `dtype`.

    Parameters
    ----------
    left : np.ndarray or ExtensionArray
    right : Any

    Returns
    -------
    np.dtype or ExtensionDtype

    See also
    --------
    find_common_type
    numpy.result_type
    """
    new_dtype: DtypeObj

    if (
        isinstance(left, np.ndarray)
        and left.dtype.kind in ["i", "u", "c"]
        and (lib.is_integer(right) or lib.is_float(right))
    ):
        # e.g. with int8 dtype and right=512, we want to end up with
        # np.int16, whereas infer_dtype_from(512) gives np.int64,
        #  which will make us upcast too far.
        if lib.is_float(right) and right.is_integer() and left.dtype.kind != "f":
            right = int(right)

        new_dtype = np.result_type(left, right)

    elif is_valid_na_for_dtype(right, left.dtype):
        # e.g. IntervalDtype[int] and None/np.nan
        new_dtype = ensure_dtype_can_hold_na(left.dtype)

    else:
        dtype, _ = infer_dtype_from(right, pandas_dtype=True)

        new_dtype = find_common_type([left.dtype, dtype])

    return new_dtype


def common_dtype_categorical_compat(
    objs: list[Index | ArrayLike], dtype: DtypeObj
) -> DtypeObj:
    """
    Update the result of find_common_type to account for NAs in a Categorical.

    Parameters
    ----------
    objs : list[np.ndarray | ExtensionArray | Index]
    dtype : np.dtype or ExtensionDtype

    Returns
    -------
    np.dtype or ExtensionDtype
    """
    # GH#38240

    # TODO: more generally, could do `not can_hold_na(dtype)`
    if isinstance(dtype, np.dtype) and dtype.kind in ["i", "u"]:

        for obj in objs:
            # We don't want to accientally allow e.g. "categorical" str here
            obj_dtype = getattr(obj, "dtype", None)
            if isinstance(obj_dtype, CategoricalDtype):
                if isinstance(obj, ABCIndex):
                    # This check may already be cached
                    hasnas = obj.hasnans
                else:
                    # Categorical
                    hasnas = cast("Categorical", obj)._hasna

                if hasnas:
                    # see test_union_int_categorical_with_nan
                    dtype = np.dtype(np.float64)
                    break
    return dtype


@overload
def find_common_type(types: list[np.dtype]) -> np.dtype:
    ...


@overload
def find_common_type(types: list[ExtensionDtype]) -> DtypeObj:
    ...


@overload
def find_common_type(types: list[DtypeObj]) -> DtypeObj:
    ...


def find_common_type(types):
    """
    Find a common data type among the given dtypes.

    Parameters
    ----------
    types : list of dtypes

    Returns
    -------
    pandas extension or numpy dtype

    See Also
    --------
    numpy.find_common_type

    """
    if not types:
        raise ValueError("no types given")

    first = types[0]

    # workaround for find_common_type([np.dtype('datetime64[ns]')] * 2)
    # => object
    if lib.dtypes_all_equal(list(types)):
        return first

    # get unique types (dict.fromkeys is used as order-preserving set())
    types = list(dict.fromkeys(types).keys())

    if any(isinstance(t, ExtensionDtype) for t in types):
        for t in types:
            if isinstance(t, ExtensionDtype):
                res = t._get_common_dtype(types)
                if res is not None:
                    return res
        return np.dtype("object")

    # take lowest unit
    if all(is_datetime64_dtype(t) for t in types):
        return np.dtype("datetime64[ns]")
    if all(is_timedelta64_dtype(t) for t in types):
        return np.dtype("timedelta64[ns]")

    # don't mix bool / int or float or complex
    # this is different from numpy, which casts bool with float/int as int
    has_bools = any(is_bool_dtype(t) for t in types)
    if has_bools:
        for t in types:
            if is_integer_dtype(t) or is_float_dtype(t) or is_complex_dtype(t):
                return np.dtype("object")

    return np.find_common_type(types, [])


def construct_2d_arraylike_from_scalar(
    value: Scalar, length: int, width: int, dtype: np.dtype, copy: bool
) -> np.ndarray:

    shape = (length, width)

    if dtype.kind in ["m", "M"]:
        value = _maybe_unbox_datetimelike_tz_deprecation(value, dtype)
    elif dtype == _dtype_obj:
        if isinstance(value, (np.timedelta64, np.datetime64)):
            # calling np.array below would cast to pytimedelta/pydatetime
            out = np.empty(shape, dtype=object)
            out.fill(value)
            return out

    # Attempt to coerce to a numpy array
    try:
        arr = np.array(value, dtype=dtype, copy=copy)
    except (ValueError, TypeError) as err:
        raise TypeError(
            f"DataFrame constructor called with incompatible data and dtype: {err}"
        ) from err

    if arr.ndim != 0:
        raise ValueError("DataFrame constructor not properly called!")

    return np.full(shape, arr)


def construct_1d_arraylike_from_scalar(
    value: Scalar, length: int, dtype: DtypeObj | None
) -> ArrayLike:
    """
    create a np.ndarray / pandas type of specified shape and dtype
    filled with values

    Parameters
    ----------
    value : scalar value
    length : int
    dtype : pandas_dtype or np.dtype

    Returns
    -------
    np.ndarray / pandas type of length, filled with value

    """

    if dtype is None:
        try:
            dtype, value = infer_dtype_from_scalar(value, pandas_dtype=True)
        except OutOfBoundsDatetime:
            dtype = _dtype_obj

    if isinstance(dtype, ExtensionDtype):
        cls = dtype.construct_array_type()
        seq = [] if length == 0 else [value]
        subarr = cls._from_sequence(seq, dtype=dtype).repeat(length)

    else:

        if length and is_integer_dtype(dtype) and isna(value):
            # coerce if we have nan for an integer dtype
            dtype = np.dtype("float64")
        elif isinstance(dtype, np.dtype) and dtype.kind in ("U", "S"):
            # we need to coerce to object dtype to avoid
            # to allow numpy to take our string as a scalar value
            dtype = np.dtype("object")
            if not isna(value):
                value = ensure_str(value)
        elif dtype.kind in ["M", "m"]:
            value = _maybe_unbox_datetimelike_tz_deprecation(value, dtype)

        subarr = np.empty(length, dtype=dtype)
        if length:
            # GH 47391: numpy > 1.24 will raise filling np.nan into int dtypes
            subarr.fill(value)

    return subarr


def _maybe_unbox_datetimelike_tz_deprecation(value: Scalar, dtype: DtypeObj):
    """
    Wrap _maybe_unbox_datetimelike with a check for a timezone-aware Timestamp
    along with a timezone-naive datetime64 dtype, which is deprecated.
    """
    # Caller is responsible for checking dtype.kind in ["m", "M"]

    if isinstance(value, datetime):
        # we dont want to box dt64, in particular datetime64("NaT")
        value = maybe_box_datetimelike(value, dtype)

    try:
        value = _maybe_unbox_datetimelike(value, dtype)
    except TypeError:
        if (
            isinstance(value, Timestamp)
            and value.tzinfo is not None
            and isinstance(dtype, np.dtype)
            and dtype.kind == "M"
        ):
            warnings.warn(
                "Data is timezone-aware. Converting "
                "timezone-aware data to timezone-naive by "
                "passing dtype='datetime64[ns]' to "
                "DataFrame or Series is deprecated and will "
                "raise in a future version. Use "
                "`pd.Series(values).dt.tz_localize(None)` "
                "instead.",
                FutureWarning,
                stacklevel=find_stack_level(inspect.currentframe()),
            )
            new_value = value.tz_localize(None)
            return _maybe_unbox_datetimelike(new_value, dtype)
        else:
            raise
    return value


def construct_1d_object_array_from_listlike(values: Sized) -> np.ndarray:
    """
    Transform any list-like object in a 1-dimensional numpy array of object
    dtype.

    Parameters
    ----------
    values : any iterable which has a len()

    Raises
    ------
    TypeError
        * If `values` does not have a len()

    Returns
    -------
    1-dimensional numpy array of dtype object
    """
    # numpy will try to interpret nested lists as further dimensions, hence
    # making a 1D array that contains list-likes is a bit tricky:
    result = np.empty(len(values), dtype="object")
    result[:] = values
    return result


def maybe_cast_to_integer_array(
    arr: list | np.ndarray, dtype: np.dtype, copy: bool = False
) -> np.ndarray:
    """
    Takes any dtype and returns the casted version, raising for when data is
    incompatible with integer/unsigned integer dtypes.

    Parameters
    ----------
    arr : np.ndarray or list
        The array to cast.
    dtype : np.dtype
        The integer dtype to cast the array to.
    copy: bool, default False
        Whether to make a copy of the array before returning.

    Returns
    -------
    ndarray
        Array of integer or unsigned integer dtype.

    Raises
    ------
    OverflowError : the dtype is incompatible with the data
    ValueError : loss of precision has occurred during casting

    Examples
    --------
    If you try to coerce negative values to unsigned integers, it raises:

    >>> pd.Series([-1], dtype="uint64")
    Traceback (most recent call last):
        ...
    OverflowError: Trying to coerce negative values to unsigned integers

    Also, if you try to coerce float values to integers, it raises:

    >>> maybe_cast_to_integer_array([1, 2, 3.5], dtype=np.dtype("int64"))
    Traceback (most recent call last):
        ...
    ValueError: Trying to coerce float values to integers
    """
    assert is_integer_dtype(dtype)

    try:
        if not isinstance(arr, np.ndarray):
            casted = np.array(arr, dtype=dtype, copy=copy)
        else:
            casted = arr.astype(dtype, copy=copy)
    except OverflowError as err:
        raise OverflowError(
            "The elements provided in the data cannot all be "
            f"casted to the dtype {dtype}"
        ) from err

    if np.array_equal(arr, casted):
        return casted

    # We do this casting to allow for proper
    # data and dtype checking.
    #
    # We didn't do this earlier because NumPy
    # doesn't handle `uint64` correctly.
    arr = np.asarray(arr)

    if is_unsigned_integer_dtype(dtype) and (arr < 0).any():
        raise OverflowError("Trying to coerce negative values to unsigned integers")

    if is_float_dtype(arr.dtype):
        if not np.isfinite(arr).all():
            raise IntCastingNaNError(
                "Cannot convert non-finite values (NA or inf) to integer"
            )
        raise ValueError("Trying to coerce float values to integers")
    if is_object_dtype(arr.dtype):
        raise ValueError("Trying to coerce float values to integers")

    if casted.dtype < arr.dtype:
        # GH#41734 e.g. [1, 200, 923442] and dtype="int8" -> overflows
        warnings.warn(
            f"Values are too large to be losslessly cast to {dtype}. "
            "In a future version this will raise OverflowError. To retain the "
            f"old behavior, use pd.Series(values).astype({dtype})",
            FutureWarning,
            stacklevel=find_stack_level(inspect.currentframe()),
        )
        return casted

    if arr.dtype.kind in ["m", "M"]:
        # test_constructor_maskedarray_nonfloat
        warnings.warn(
            f"Constructing Series or DataFrame from {arr.dtype} values and "
            f"dtype={dtype} is deprecated and will raise in a future version. "
            "Use values.view(dtype) instead.",
            FutureWarning,
            stacklevel=find_stack_level(inspect.currentframe()),
        )
        return casted

    # No known cases that get here, but raising explicitly to cover our bases.
    raise ValueError(f"values cannot be losslessly cast to {dtype}")


def can_hold_element(arr: ArrayLike, element: Any) -> bool:
    """
    Can we do an inplace setitem with this element in an array with this dtype?

    Parameters
    ----------
    arr : np.ndarray or ExtensionArray
    element : Any

    Returns
    -------
    bool
    """
    dtype = arr.dtype
    if not isinstance(dtype, np.dtype) or dtype.kind in ["m", "M"]:
        if isinstance(dtype, (PeriodDtype, IntervalDtype, DatetimeTZDtype, np.dtype)):
            # np.dtype here catches datetime64ns and timedelta64ns; we assume
            #  in this case that we have DatetimeArray/TimedeltaArray
            arr = cast(
                "PeriodArray | DatetimeArray | TimedeltaArray | IntervalArray", arr
            )
            try:
                arr._validate_setitem_value(element)
                return True
            except (ValueError, TypeError):
                # TODO(2.0): stop catching ValueError for tzaware, see
                #  _catch_deprecated_value_error
                return False

        # This is technically incorrect, but maintains the behavior of
        # ExtensionBlock._can_hold_element
        return True

    try:
        np_can_hold_element(dtype, element)
        return True
    except (TypeError, LossySetitemError):
        return False


def np_can_hold_element(dtype: np.dtype, element: Any) -> Any:
    """
    Raise if we cannot losslessly set this element into an ndarray with this dtype.

    Specifically about places where we disagree with numpy.  i.e. there are
    cases where numpy will raise in doing the setitem that we do not check
    for here, e.g. setting str "X" into a numeric ndarray.

    Returns
    -------
    Any
        The element, potentially cast to the dtype.

    Raises
    ------
    ValueError : If we cannot losslessly store this element with this dtype.
    """
    if dtype == _dtype_obj:
        return element

    tipo = _maybe_infer_dtype_type(element)

    if dtype.kind in ["i", "u"]:
        if isinstance(element, range):
            if _dtype_can_hold_range(element, dtype):
                return element
            raise LossySetitemError

        elif is_integer(element) or (is_float(element) and element.is_integer()):
            # e.g. test_setitem_series_int8 if we have a python int 1
            #  tipo may be np.int32, despite the fact that it will fit
            #  in smaller int dtypes.
            info = np.iinfo(dtype)
            if info.min <= element <= info.max:
                return dtype.type(element)
            raise LossySetitemError

        if tipo is not None:
            if tipo.kind not in ["i", "u"]:
                if isinstance(element, np.ndarray) and element.dtype.kind == "f":
                    # If all can be losslessly cast to integers, then we can hold them
                    with np.errstate(invalid="ignore"):
                        # We check afterwards if cast was losslessly, so no need to show
                        # the warning
                        casted = element.astype(dtype)
                    comp = casted == element
                    if comp.all():
                        # Return the casted values bc they can be passed to
                        #  np.putmask, whereas the raw values cannot.
                        #  see TestSetitemFloatNDarrayIntoIntegerSeries
                        return casted
                    raise LossySetitemError

                # Anything other than integer we cannot hold
                raise LossySetitemError
            elif (
                dtype.kind == "u"
                and isinstance(element, np.ndarray)
                and element.dtype.kind == "i"
            ):
                # see test_where_uint64
                casted = element.astype(dtype)
                if (casted == element).all():
                    # TODO: faster to check (element >=0).all()?  potential
                    #  itemsize issues there?
                    return casted
                raise LossySetitemError
            elif dtype.itemsize < tipo.itemsize:
                raise LossySetitemError
            elif not isinstance(tipo, np.dtype):
                # i.e. nullable IntegerDtype; we can put this into an ndarray
                #  losslessly iff it has no NAs
                if element._hasna:
                    raise LossySetitemError
                return element

            return element

        raise LossySetitemError

    elif dtype.kind == "f":
        if lib.is_integer(element) or lib.is_float(element):
            casted = dtype.type(element)
            if np.isnan(casted) or casted == element:
                return casted
            # otherwise e.g. overflow see TestCoercionFloat32
            raise LossySetitemError

        if tipo is not None:
            # TODO: itemsize check?
            if tipo.kind not in ["f", "i", "u"]:
                # Anything other than float/integer we cannot hold
                raise LossySetitemError
            elif not isinstance(tipo, np.dtype):
                # i.e. nullable IntegerDtype or FloatingDtype;
                #  we can put this into an ndarray losslessly iff it has no NAs
                if element._hasna:
                    raise LossySetitemError
                return element
            elif tipo.itemsize > dtype.itemsize or tipo.kind != dtype.kind:
                if isinstance(element, np.ndarray):
                    # e.g. TestDataFrameIndexingWhere::test_where_alignment
                    casted = element.astype(dtype)
                    # TODO(np>=1.20): we can just use np.array_equal with equal_nan
                    if array_equivalent(casted, element):
                        return casted
                    raise LossySetitemError

            return element

        raise LossySetitemError

    elif dtype.kind == "c":
        if lib.is_integer(element) or lib.is_complex(element) or lib.is_float(element):
            if np.isnan(element):
                # see test_where_complex GH#6345
                return dtype.type(element)

            casted = dtype.type(element)
            if casted == element:
                return casted
            # otherwise e.g. overflow see test_32878_complex_itemsize
            raise LossySetitemError

        if tipo is not None:
            if tipo.kind in ["c", "f", "i", "u"]:
                return element
            raise LossySetitemError
        raise LossySetitemError

    elif dtype.kind == "b":
        if tipo is not None:
            if tipo.kind == "b":
                if not isinstance(tipo, np.dtype):
                    # i.e. we have a BooleanArray
                    if element._hasna:
                        # i.e. there are pd.NA elements
                        raise LossySetitemError
                return element
            raise LossySetitemError
        if lib.is_bool(element):
            return element
        raise LossySetitemError

    elif dtype.kind == "S":
        # TODO: test tests.frame.methods.test_replace tests get here,
        #  need more targeted tests.  xref phofl has a PR about this
        if tipo is not None:
            if tipo.kind == "S" and tipo.itemsize <= dtype.itemsize:
                return element
            raise LossySetitemError
        if isinstance(element, bytes) and len(element) <= dtype.itemsize:
            return element
        raise LossySetitemError

    raise NotImplementedError(dtype)


def _dtype_can_hold_range(rng: range, dtype: np.dtype) -> bool:
    """
    _maybe_infer_dtype_type infers to int64 (and float64 for very large endpoints),
    but in many cases a range can be held by a smaller integer dtype.
    Check if this is one of those cases.
    """
    if not len(rng):
        return True
    return np.can_cast(rng[0], dtype) and np.can_cast(rng[-1], dtype)


class LossySetitemError(Exception):
    """
    Raised when trying to do a __setitem__ on an np.ndarray that is not lossless.
    """

    pass