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# Apache License, Version 2.0 (the "License"); you may not use this file except in
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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"""Module houses builder class for Map operator."""

from .operator import Operator


class Map(Operator):
    """Builder class for Map operator."""

    @classmethod
    def call(cls, function, *call_args, **call_kwds):
        """
        Build Map operator that will be performed across each partition.

        Parameters
        ----------
        function : callable(pandas.DataFrame) -> pandas.DataFrame
            Function that will be applied to the each partition.
            Function takes `pandas.DataFrame` and returns `pandas.DataFrame`
            of the same shape.
        *call_args : args
            Args that will be passed to the returned function.
        **call_kwds : kwargs
            Kwargs that will be passed to the returned function.

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

        def caller(query_compiler, *args, **kwargs):
            """Execute Map function against passed query compiler."""
            return query_compiler.__constructor__(
                query_compiler._modin_frame.map(
                    lambda x: function(x, *args, **kwargs), *call_args, **call_kwds
                )
            )

        return caller