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# Apache License, Version 2.0 (the "License"); you may not use this file except in
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#
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"""Module houses Fold functions builder class."""

from .function import Function


class FoldFunction(Function):
    """Builder class for FoldReduce functions."""

    @classmethod
    def call(cls, fold_function, axis=None):
        """
        Build Fold function that will be performed across rows/columns.

        Parameters
        ----------
        fold_function : callable(pandas.DataFrame) -> pandas.DataFrame
            Function to apply across rows/columns.
        axis : int, optional
            Specifies axis to apply function along.

        Returns
        -------
        callable
            Function that takes query compiler and executes Fold function.
        """

        def caller(query_compiler, *args, **kwargs):
            """Execute Fold function against passed query compiler."""
            _axis = kwargs.get("axis") if axis is None else axis
            return query_compiler.__constructor__(
                query_compiler._modin_frame.fold(
                    cls.validate_axis(_axis),
                    lambda x: fold_function(x, *args, **kwargs),
                )
            )

        return caller
