# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This code is based on https://github.com/saic-vul/ritm_interactive_segmentation
Ths copyright of saic-vul/ritm_interactive_segmentation is as follows:
MIT License [see LICENSE for details]
"""

import paddle

from inference.clicker import Click
from .base import BaseTransform


class AddHorizontalFlip(BaseTransform):
    def transform(self, image_nd, clicks_lists):
        assert len(image_nd.shape) == 4
        image_nd = paddle.concat(
            [image_nd, paddle.flip(
                image_nd, axis=[3])], axis=0)

        image_width = image_nd.shape[3]
        clicks_lists_flipped = []
        for clicks_list in clicks_lists:
            clicks_list_flipped = [
                click.copy(coords=(click.coords[0],
                                   image_width - click.coords[1] - 1))
                for click in clicks_list
            ]
            clicks_lists_flipped.append(clicks_list_flipped)
        clicks_lists = clicks_lists + clicks_lists_flipped

        return image_nd, clicks_lists

    def inv_transform(self, prob_map):
        assert len(prob_map.shape) == 4 and prob_map.shape[0] % 2 == 0
        num_maps = prob_map.shape[0] // 2
        prob_map, prob_map_flipped = prob_map[:num_maps], prob_map[num_maps:]

        return 0.5 * (prob_map + paddle.flip(prob_map_flipped, axis=[3]))

    def get_state(self):
        return None

    def set_state(self, state):
        pass

    def reset(self):
        pass