# Copyright (C) 2013-2023 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
from __future__ import annotations

import datetime as dt
from typing import Any
from typing import Optional
from typing import overload
from typing import Type
from typing import TYPE_CHECKING
from uuid import UUID as _python_UUID

from ...sql import sqltypes
from ...sql import type_api
from ...util.typing import Literal

_DECIMAL_TYPES = (1231, 1700)
_FLOAT_TYPES = (700, 701, 1021, 1022)
_INT_TYPES = (20, 21, 23, 26, 1005, 1007, 1016)


class PGUuid(sqltypes.UUID[sqltypes._UUID_RETURN]):
    render_bind_cast = True
    render_literal_cast = True

    if TYPE_CHECKING:

        @overload
        def __init__(
            self: PGUuid[_python_UUID], as_uuid: Literal[True] = ...
        ) -> None:
            ...

        @overload
        def __init__(self: PGUuid[str], as_uuid: Literal[False] = ...) -> None:
            ...

        def __init__(self, as_uuid: bool = True) -> None:
            ...


class BYTEA(sqltypes.LargeBinary):
    __visit_name__ = "BYTEA"


class INET(sqltypes.TypeEngine[str]):
    __visit_name__ = "INET"


PGInet = INET


class CIDR(sqltypes.TypeEngine[str]):
    __visit_name__ = "CIDR"


PGCidr = CIDR


class MACADDR(sqltypes.TypeEngine[str]):
    __visit_name__ = "MACADDR"


PGMacAddr = MACADDR


class MACADDR8(sqltypes.TypeEngine[str]):
    __visit_name__ = "MACADDR8"


PGMacAddr8 = MACADDR8


class MONEY(sqltypes.TypeEngine[str]):
    r"""Provide the PostgreSQL MONEY type.

    Depending on driver, result rows using this type may return a
    string value which includes currency symbols.

    For this reason, it may be preferable to provide conversion to a
    numerically-based currency datatype using :class:`_types.TypeDecorator`::

        import re
        import decimal
        from sqlalchemy import Dialect
        from sqlalchemy import TypeDecorator

        class NumericMoney(TypeDecorator):
            impl = MONEY

            def process_result_value(
                self, value: Any, dialect: Dialect
            ) -> None:
                if value is not None:
                    # adjust this for the currency and numeric
                    m = re.match(r"\$([\d.]+)", value)
                    if m:
                        value = decimal.Decimal(m.group(1))
                return value

    Alternatively, the conversion may be applied as a CAST using
    the :meth:`_types.TypeDecorator.column_expression` method as follows::

        import decimal
        from sqlalchemy import cast
        from sqlalchemy import TypeDecorator

        class NumericMoney(TypeDecorator):
            impl = MONEY

            def column_expression(self, column: Any):
                return cast(column, Numeric())

    .. versionadded:: 1.2

    """

    __visit_name__ = "MONEY"


class OID(sqltypes.TypeEngine[int]):

    """Provide the PostgreSQL OID type."""

    __visit_name__ = "OID"


class REGCONFIG(sqltypes.TypeEngine[str]):

    """Provide the PostgreSQL REGCONFIG type.

    .. versionadded:: 2.0.0rc1

    """

    __visit_name__ = "REGCONFIG"


class TSQUERY(sqltypes.TypeEngine[str]):

    """Provide the PostgreSQL TSQUERY type.

    .. versionadded:: 2.0.0rc1

    """

    __visit_name__ = "TSQUERY"


class REGCLASS(sqltypes.TypeEngine[str]):

    """Provide the PostgreSQL REGCLASS type.

    .. versionadded:: 1.2.7

    """

    __visit_name__ = "REGCLASS"


class TIMESTAMP(sqltypes.TIMESTAMP):

    """Provide the PostgreSQL TIMESTAMP type."""

    __visit_name__ = "TIMESTAMP"

    def __init__(
        self, timezone: bool = False, precision: Optional[int] = None
    ) -> None:
        """Construct a TIMESTAMP.

        :param timezone: boolean value if timezone present, default False
        :param precision: optional integer precision value

         .. versionadded:: 1.4

        """
        super().__init__(timezone=timezone)
        self.precision = precision


class TIME(sqltypes.TIME):

    """PostgreSQL TIME type."""

    __visit_name__ = "TIME"

    def __init__(
        self, timezone: bool = False, precision: Optional[int] = None
    ) -> None:
        """Construct a TIME.

        :param timezone: boolean value if timezone present, default False
        :param precision: optional integer precision value

         .. versionadded:: 1.4

        """
        super().__init__(timezone=timezone)
        self.precision = precision


class INTERVAL(type_api.NativeForEmulated, sqltypes._AbstractInterval):

    """PostgreSQL INTERVAL type."""

    __visit_name__ = "INTERVAL"
    native = True

    def __init__(
        self, precision: Optional[int] = None, fields: Optional[str] = None
    ) -> None:
        """Construct an INTERVAL.

        :param precision: optional integer precision value
        :param fields: string fields specifier.  allows storage of fields
         to be limited, such as ``"YEAR"``, ``"MONTH"``, ``"DAY TO HOUR"``,
         etc.

         .. versionadded:: 1.2

        """
        self.precision = precision
        self.fields = fields

    @classmethod
    def adapt_emulated_to_native(
        cls, interval: sqltypes.Interval, **kw: Any  # type: ignore[override]
    ) -> INTERVAL:
        return INTERVAL(precision=interval.second_precision)

    @property
    def _type_affinity(self) -> Type[sqltypes.Interval]:
        return sqltypes.Interval

    def as_generic(self, allow_nulltype: bool = False) -> sqltypes.Interval:
        return sqltypes.Interval(native=True, second_precision=self.precision)

    @property
    def python_type(self) -> Type[dt.timedelta]:
        return dt.timedelta


PGInterval = INTERVAL


class BIT(sqltypes.TypeEngine[int]):
    __visit_name__ = "BIT"

    def __init__(
        self, length: Optional[int] = None, varying: bool = False
    ) -> None:
        if varying:
            # BIT VARYING can be unlimited-length, so no default
            self.length = length
        else:
            # BIT without VARYING defaults to length 1
            self.length = length or 1
        self.varying = varying


PGBit = BIT


class TSVECTOR(sqltypes.TypeEngine[str]):

    """The :class:`_postgresql.TSVECTOR` type implements the PostgreSQL
    text search type TSVECTOR.

    It can be used to do full text queries on natural language
    documents.

    .. seealso::

        :ref:`postgresql_match`

    """

    __visit_name__ = "TSVECTOR"


class CITEXT(sqltypes.TEXT):

    """Provide the PostgreSQL CITEXT type.

    .. versionadded:: 2.0.7

    """

    __visit_name__ = "CITEXT"
