# Copyright © 2020, Joseph Berry, Rico Tabor (opendrop.dev@gmail.com)
# OpenDrop is released under the GNU GPL License. You are free to
# modify and distribute the code, but always under the same license
# (i.e. you cannot make commercial derivatives).
#
# If you use this software in your research, please cite the following
# journal articles:
#
# J. D. Berry, M. J. Neeson, R. R. Dagastine, D. Y. C. Chan and
# R. F. Tabor, Measurement of surface and interfacial tension using
# pendant drop tensiometry. Journal of Colloid and Interface Science 454
# (2015) 226–237. https://doi.org/10.1016/j.jcis.2015.05.012
#
# E. Huang, T. Denning, A. Skoufis, J. Qi, R. R. Dagastine, R. F. Tabor
# and J. D. Berry, OpenDrop: Open-source software for pendant drop
# tensiometry & contact angle measurements, submitted to the Journal of
# Open Source Software
#
# These citations help us not only to understand who is using and
# developing OpenDrop, and for what purpose, but also to justify
# continued development of this code and other open source resources.
#
# OpenDrop is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the GNU General Public License for more details.  You
# should have received a copy of the GNU General Public License along
# with this software.  If not, see <https://www.gnu.org/licenses/>.


import math
from abc import ABC, abstractmethod
from typing import Sequence, Optional, Tuple

import numpy as np


class ImageAcquirer(ABC):
    @abstractmethod
    def acquire_images(self) -> Sequence['InputImage']:
        """Implementation of acquire_images()"""

    @abstractmethod
    def get_image_size_hint(self) -> Optional[Tuple[int, int]]:
        """Implementation of get_image_size_hint()"""

    def destroy(self) -> None:
        """Destroy this object, perform any necessary cleanup tasks."""


class InputImage(ABC):
    est_ready = math.nan
    is_replicated = False

    @abstractmethod
    async def read(self) -> Tuple[np.ndarray, float]:
        """Return the image and timestamp."""

    def cancel(self) -> None:
        pass
