import datetime
import logging
from typing import Any, Final

from localstack.services.stepfunctions.asl.component.state.state_choice.comparison.comparison_operator_type import (
    ComparisonOperatorType,
)
from localstack.services.stepfunctions.asl.component.state.state_choice.comparison.operator.operator import (
    Operator,
)
from localstack.services.stepfunctions.asl.component.state.state_choice.comparison.variable import (
    NoSuchVariable,
)
from localstack.services.stepfunctions.asl.eval.environment import Environment

LOG = logging.getLogger(__name__)


class IsBoolean(Operator):
    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsBoolean)

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        res = isinstance(variable, bool) is value
        env.stack.append(res)


class IsNull(Operator):
    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsNull)

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        is_null = variable is None and not isinstance(variable, NoSuchVariable)
        res = is_null is value
        env.stack.append(res)


class IsNumeric(Operator):
    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsNumeric)

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        res = (isinstance(variable, (int, float)) and not isinstance(variable, bool)) is value
        env.stack.append(res)


class IsPresent(Operator):
    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsPresent)

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        res = isinstance(variable, NoSuchVariable) is not value
        env.stack.append(res)


class IsString(Operator):
    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsString)

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        res = isinstance(variable, str) is value
        env.stack.append(res)


class IsTimestamp(Operator):
    # Timestamps are strings which MUST conform to the RFC3339 profile of ISO 8601, with the further restrictions that
    # an uppercase "T" character MUST be used to separate date and time, and an uppercase "Z" character MUST be
    # present in the absence of a numeric time zone offset, for example "2016-03-14T01:59:00Z".
    TIMESTAMP_FORMAT: Final[str] = "%Y-%m-%dT%H:%M:%SZ"

    @staticmethod
    def impl_name() -> str:
        return str(ComparisonOperatorType.IsTimestamp)

    @staticmethod
    def string_to_timestamp(string: str) -> datetime.datetime | None:
        try:
            return datetime.datetime.strptime(string, IsTimestamp.TIMESTAMP_FORMAT)
        except Exception:
            return None

    @staticmethod
    def is_timestamp(inp: Any) -> bool:
        return isinstance(inp, str) and IsTimestamp.string_to_timestamp(inp) is not None

    @staticmethod
    def eval(env: Environment, value: Any) -> None:
        variable = env.stack.pop()
        LOG.warning(
            "State Choice's 'IsTimestamp' operator is not fully supported for input '%s' and target '%s'.",
            variable,
            value,
        )
        res = IsTimestamp.is_timestamp(variable) is value
        env.stack.append(res)
