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from typing import Protocol, runtime_checkable

import torch

from earth2studio.utils.type import CoordSystem


@runtime_checkable
class Perturbation(Protocol):
    """Perturbation interface."""

    @torch.inference_mode()
    def __call__(
        self,
        x: torch.Tensor,
        coords: CoordSystem,
    ) -> tuple[torch.Tensor, CoordSystem]:
        """Apply perturbation method to input tensor

        Parameters
        ----------
        x : torch.Tensor
            Input tensor intended to apply perturbation on
        coords : CoordSystem
            Ordered dict representing coordinate system that describes the tensor

        Returns
        -------
        tuple[torch.Tensor, CoordSystem]:
            Output tensor and respective coordinate system dictionary
        """
        pass
