from __future__ import annotations

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    import ibis.expr.types as ir

    from narwhals._ibis.expr import IbisExpr


class IbisExprStructNamespace:
    def __init__(self, expr: IbisExpr) -> None:
        self._compliant_expr = expr

    def field(self, name: str) -> IbisExpr:
        def func(expr: ir.StructColumn) -> ir.Column:
            return expr[name]

        return self._compliant_expr._with_callable(func).alias(name)