import sys
from typing import (
    Any, Dict, NamedTuple, Optional, Sequence, Tuple, Union, Text,
    SupportsAbs, SupportsFloat, SupportsInt, SupportsRound,
)

_Decimal = Union[Decimal, int]
_ComparableNum = Union[Decimal, int, float]

DecimalTuple = NamedTuple('DecimalTuple',
                          [('sign', int),
                           ('digits', Sequence[int]),  # TODO: Use Tuple[int, ...]
                           ('exponent', int)])

ROUND_DOWN: str
ROUND_HALF_UP: str
ROUND_HALF_EVEN: str
ROUND_CEILING: str
ROUND_FLOOR: str
ROUND_UP: str
ROUND_HALF_DOWN: str
ROUND_05UP: str

if sys.version_info >= (3,):
    HAVE_THREADS: bool
    MAX_EMAX: int
    MAX_PREC: int
    MIN_EMIN: int
    MIN_ETINY: int

class DecimalException(ArithmeticError):
    def handle(self, context, *args): ...

class Clamped(DecimalException): ...

class InvalidOperation(DecimalException): ...

class ConversionSyntax(InvalidOperation): ...

class DivisionByZero(DecimalException, ZeroDivisionError): ...

class DivisionImpossible(InvalidOperation): ...

class DivisionUndefined(InvalidOperation, ZeroDivisionError): ...

class Inexact(DecimalException): ...

class InvalidContext(InvalidOperation): ...

class Rounded(DecimalException): ...

class Subnormal(DecimalException): ...

class Overflow(Inexact, Rounded): ...

class Underflow(Inexact, Rounded, Subnormal): ...

if sys.version_info >= (3,):
    class FloatOperation(DecimalException, TypeError): ...

def setcontext(context: Context) -> None: ...
def getcontext() -> Context: ...
def localcontext(ctx: Optional[Context] = ...) -> _ContextManager: ...

if sys.version_info >= (3,):
    _SupportsRound = SupportsRound[int]
else:
    _SupportsRound = object

class Decimal(SupportsAbs[Decimal], SupportsFloat, SupportsInt, _SupportsRound):
    # TODO: SupportsCeil, SupportsFloor, SupportsTrunc?

    def __init__(cls, value: Union[_Decimal, float, Text,
                                   Tuple[int, Sequence[int], int]] = ...,
                 context: Context = ...) -> None: ...
    @classmethod
    def from_float(cls, f: float) -> Decimal: ...
    if sys.version_info >= (3,):
        def __bool__(self) -> bool: ...
    else:
        def __nonzero__(self) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...
    def __lt__(self, other: _ComparableNum) -> bool: ...
    def __le__(self, other: _ComparableNum) -> bool: ...
    def __gt__(self, other: _ComparableNum) -> bool: ...
    def __ge__(self, other: _ComparableNum) -> bool: ...
    def compare(self, other: _Decimal, context: Optional[Context] = ...) -> Decimal: ...
    def __hash__(self) -> int: ...
    def as_tuple(self) -> DecimalTuple: ...
    def to_eng_string(self, context: Context = ...) -> str: ...
    def __neg__(self) -> Decimal: ...
    def __pos__(self) -> Decimal: ...
    def __abs__(self, round: bool = ...) -> Decimal: ...
    def __add__(self, other: _Decimal) -> Decimal: ...
    def __radd__(self, other: int) -> Decimal: ...
    def __sub__(self, other: _Decimal) -> Decimal: ...
    def __rsub__(self, other: int) -> Decimal: ...
    def __mul__(self, other: _Decimal) -> Decimal: ...
    def __rmul__(self, other: int) -> Decimal: ...
    def __truediv__(self, other: _Decimal) -> Decimal: ...
    def __rtruediv__(self, other: int) -> Decimal: ...
    if sys.version_info < (3,):
        def __div__(self, other: _Decimal) -> Decimal: ...
        def __rdiv__(self, other: int) -> Decimal: ...
    def __divmod__(self, other: _Decimal) -> Tuple[Decimal, Decimal]: ...
    def __rdivmod__(self, other: int) -> Tuple[Decimal, Decimal]: ...
    def __mod__(self, other: _Decimal) -> Decimal: ...
    def __rmod__(self, other: int) -> Decimal: ...
    def remainder_near(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def __floordiv__(self, other: _Decimal) -> Decimal: ...
    def __rfloordiv__(self, other: int) -> Decimal: ...
    def __float__(self) -> float: ...
    def __int__(self) -> int: ...
    def __trunc__(self) -> int: ...
    @property
    def imag(self) -> Decimal: ...
    @property
    def real(self) -> Decimal: ...
    def conjugate(self) -> Decimal: ...
    def __complex__(self) -> complex: ...
    if sys.version_info >= (3,):
        def __round__(self, n=...) -> int: ...
        def __floor__(self) -> int: ...
        def __ceil__(self) -> int: ...
    else:
        def __long__(self) -> long: ...
    def fma(self, other: _Decimal, third: _Decimal, context: Context = ...) -> Decimal: ...
    def __pow__(self, other: _Decimal) -> Decimal: ...
    def __rpow__(self, other: int) -> Decimal: ...
    def normalize(self, context: Context = ...) -> Decimal: ...
    def quantize(self, exp: _Decimal, rounding: str = ...,
                 context: Context = ...) -> Decimal: ...
    if sys.version_info >= (3,):
        def same_quantum(self, other: _Decimal, context: Context = ...) -> bool: ...
    else:
        def same_quantum(self, other: _Decimal) -> bool: ...
    def to_integral(self, rounding: str = ..., context: Context = ...) -> Decimal: ...
    def to_integral_exact(self, rounding: str = ..., context: Context = ...) -> Decimal: ...
    def to_integral_value(self, rounding: str = ..., context: Context = ...) -> Decimal: ...
    def sqrt(self, context: Context = ...) -> Decimal: ...
    def max(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def min(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def adjusted(self) -> int: ...
    if sys.version_info >= (3,):
        def canonical(self) -> Decimal: ...
    else:
        def canonical(self, context: Context = ...) -> Decimal: ...
    def compare_signal(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    if sys.version_info >= (3,):
        def compare_total(self, other: _Decimal, context: Context = ...) -> Decimal: ...
        def compare_total_mag(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    else:
        def compare_total(self, other: _Decimal) -> Decimal: ...
        def compare_total_mag(self, other: _Decimal) -> Decimal: ...
    def copy_abs(self) -> Decimal: ...
    def copy_negate(self) -> Decimal: ...
    if sys.version_info >= (3,):
        def copy_sign(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    else:
        def copy_sign(self, other: _Decimal) -> Decimal: ...
    def exp(self, context: Context = ...) -> Decimal: ...
    def is_canonical(self) -> bool: ...
    def is_finite(self) -> bool: ...
    def is_infinite(self) -> bool: ...
    def is_nan(self) -> bool: ...
    def is_normal(self, context: Context = ...) -> bool: ...
    def is_qnan(self) -> bool: ...
    def is_signed(self) -> bool: ...
    def is_snan(self) -> bool: ...
    def is_subnormal(self, context: Context = ...) -> bool: ...
    def is_zero(self) -> bool: ...
    def ln(self, context: Context = ...) -> Decimal: ...
    def log10(self, context: Context = ...) -> Decimal: ...
    def logb(self, context: Context = ...) -> Decimal: ...
    def logical_and(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def logical_invert(self, context: Context = ...) -> Decimal: ...
    def logical_or(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def logical_xor(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def max_mag(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def min_mag(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def next_minus(self, context: Context = ...) -> Decimal: ...
    def next_plus(self, context: Context = ...) -> Decimal: ...
    def next_toward(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def number_class(self, context: Context = ...) -> str: ...
    def radix(self) -> Decimal: ...
    def rotate(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def scaleb(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def shift(self, other: _Decimal, context: Context = ...) -> Decimal: ...
    def __reduce__(self): ...
    def __copy__(self) -> Decimal: ...
    def __deepcopy__(self, memo) -> Decimal: ...
    def __format__(self, specifier, context=..., _localeconv=...) -> str: ...

class _ContextManager:
    new_context: Context
    saved_context: Context
    def __init__(self, new_context: Context) -> None: ...
    def __enter__(self) -> Context: ...
    def __exit__(self, t, v, tb) -> None: ...

class Context:
    prec: int
    rounding: str
    Emin: int
    Emax: int
    capitals: int
    if sys.version_info >= (3,):
        clamp: int
    else:
        _clamp: int
    traps: Dict[type, bool]
    flags: Any
    if sys.version_info >= (3,):
        def __init__(self, prec: Optional[int] = ..., rounding: Optional[str] = ...,
                     Emin: Optional[int] = ..., Emax: Optional[int] = ...,
                     capitals: Optional[int] = ..., clamp: Optional[int] = ...,
                     flags=..., traps=...,
                     _ignored_flags=...) -> None: ...
    else:
        def __init__(self, prec: Optional[int] = ..., rounding: Optional[str] = ...,
                     traps=..., flags=...,
                     Emin: Optional[int] = ..., Emax: Optional[int] = ...,
                     capitals: Optional[int] = ..., _clamp: Optional[int] = ...,
                     _ignored_flags=...) -> None: ...
    if sys.version_info >= (3,):
        def __delattr__(self, name): ...
        def __reduce__(self): ...
    def clear_flags(self): ...
    if sys.version_info >= (3,):
        def clear_traps(self): ...
    def copy(self) -> Context: ...
    def __copy__(self) -> Context: ...
    __hash__: Any = ...
    def Etiny(self): ...
    def Etop(self): ...
    def create_decimal(self, num=...): ...
    def create_decimal_from_float(self, f): ...
    def abs(self, a: _Decimal) -> Decimal: ...
    def add(self, a: _Decimal, b: _Decimal) -> Decimal: ...
    def canonical(self, a): ...
    def compare(self, a, b): ...
    def compare_signal(self, a, b): ...
    def compare_total(self, a, b): ...
    def compare_total_mag(self, a, b): ...
    def copy_abs(self, a): ...
    def copy_decimal(self, a): ...
    def copy_negate(self, a): ...
    def copy_sign(self, a, b): ...
    def divide(self, a, b): ...
    def divide_int(self, a, b): ...
    def divmod(self, a, b): ...
    def exp(self, a): ...
    def fma(self, a, b, c): ...
    def is_canonical(self, a): ...
    def is_finite(self, a): ...
    def is_infinite(self, a): ...
    def is_nan(self, a): ...
    def is_normal(self, a): ...
    def is_qnan(self, a): ...
    def is_signed(self, a): ...
    def is_snan(self, a): ...
    def is_subnormal(self, a): ...
    def is_zero(self, a): ...
    def ln(self, a): ...
    def log10(self, a): ...
    def logb(self, a): ...
    def logical_and(self, a, b): ...
    def logical_invert(self, a): ...
    def logical_or(self, a, b): ...
    def logical_xor(self, a, b): ...
    def max(self, a, b): ...
    def max_mag(self, a, b): ...
    def min(self, a, b): ...
    def min_mag(self, a, b): ...
    def minus(self, a): ...
    def multiply(self, a, b): ...
    def next_minus(self, a): ...
    def next_plus(self, a): ...
    def next_toward(self, a, b): ...
    def normalize(self, a): ...
    def number_class(self, a): ...
    def plus(self, a): ...
    def power(self, a: _Decimal, b: _Decimal, modulo: Optional[_Decimal] = ...) -> Decimal: ...
    def quantize(self, a, b): ...
    def radix(self): ...
    def remainder(self, a, b): ...
    def remainder_near(self, a, b): ...
    def rotate(self, a, b): ...
    def same_quantum(self, a, b): ...
    def scaleb(self, a, b): ...
    def shift(self, a, b): ...
    def sqrt(self, a): ...
    def subtract(self, a, b): ...
    def to_eng_string(self, a): ...
    def to_sci_string(self, a): ...
    def to_integral_exact(self, a): ...
    def to_integral_value(self, a): ...
    def to_integral(self, a): ...

DefaultContext: Context
BasicContext: Context
ExtendedContext: Context