from __future__ import annotations

import numpy as np

__all__ = ["copy_and_paste_blend"]


def copy_and_paste_blend(
    base_image: np.ndarray,
    overlay_image: np.ndarray,
    overlay_mask: np.ndarray,
    offset: tuple[int, int],
) -> np.ndarray:
    y_offset, x_offset = offset

    blended_image = base_image.copy()
    mask_indices = np.where(overlay_mask > 0)
    blended_image[mask_indices[0] + y_offset, mask_indices[1] + x_offset] = overlay_image[
        mask_indices[0],
        mask_indices[1],
    ]
    return blended_image