# Copyright 2024 The HuggingFace Team. 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.
import unittest

import numpy as np

from transformers.testing_utils import require_torch, require_vision
from transformers.utils import is_torch_available

from ...test_image_processing_common import ImageProcessingTester, ImageProcessingTestMixin


if is_torch_available():
    import torch

    from transformers.models.superpoint.modeling_superpoint import SuperPointKeypointDescriptionOutput


class SuperPointImageProcessingTester(ImageProcessingTester):
    def __init__(self, **kwargs):
        # Image processor init kwargs
        kwargs.setdefault("size", {"height": 480, "width": 640})
        kwargs.setdefault("do_grayscale", True)

        super().__init__(**kwargs)

    def prepare_keypoint_detection_output(self, pixel_values):
        max_number_keypoints = 50
        batch_size = len(pixel_values)
        mask = torch.zeros((batch_size, max_number_keypoints))
        keypoints = torch.zeros((batch_size, max_number_keypoints, 2))
        scores = torch.zeros((batch_size, max_number_keypoints))
        descriptors = torch.zeros((batch_size, max_number_keypoints, 16))
        for i in range(batch_size):
            random_number_keypoints = np.random.randint(0, max_number_keypoints)
            mask[i, :random_number_keypoints] = 1
            keypoints[i, :random_number_keypoints] = torch.rand((random_number_keypoints, 2))
            scores[i, :random_number_keypoints] = torch.rand((random_number_keypoints,))
            descriptors[i, :random_number_keypoints] = torch.rand((random_number_keypoints, 16))
        return SuperPointKeypointDescriptionOutput(
            loss=None, keypoints=keypoints, scores=scores, descriptors=descriptors, mask=mask, hidden_states=None
        )


@require_torch
@require_vision
class SuperPointImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    image_processor_tester_class = SuperPointImageProcessingTester

    def test_image_processing(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            self.assertTrue(hasattr(image_processing, "do_resize"))
            self.assertTrue(hasattr(image_processing, "size"))
            self.assertTrue(hasattr(image_processing, "do_rescale"))
            self.assertTrue(hasattr(image_processing, "rescale_factor"))
            self.assertTrue(hasattr(image_processing, "do_grayscale"))

    @unittest.skip(reason="SuperPointImageProcessor is always supposed to return a grayscaled image")
    def test_call_numpy_4_channels(self):
        pass

    def test_input_image_properly_converted_to_grayscale(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)
            image_inputs = self.image_processor_tester.prepare_image_inputs()
            pre_processed_images = image_processor.preprocess(image_inputs)
            for image in pre_processed_images["pixel_values"]:
                if isinstance(image, torch.Tensor):
                    self.assertTrue(
                        torch.all(image[0, ...] == image[1, ...]).item()
                        and torch.all(image[1, ...] == image[2, ...]).item()
                    )
                else:
                    self.assertTrue(np.all(image[0, ...] == image[1, ...]) and np.all(image[1, ...] == image[2, ...]))

    @require_torch
    def test_post_processing_keypoint_detection(self):
        def check_post_processed_output(post_processed_output, image_size):
            for post_processed_output, image_size in zip(post_processed_output, image_size):
                self.assertTrue("keypoints" in post_processed_output)
                self.assertTrue("descriptors" in post_processed_output)
                self.assertTrue("scores" in post_processed_output)
                keypoints = post_processed_output["keypoints"]
                all_below_image_size = torch.all(keypoints[:, 0] <= image_size[1]) and torch.all(
                    keypoints[:, 1] <= image_size[0]
                )
                all_above_zero = torch.all(keypoints[:, 0] >= 0) and torch.all(keypoints[:, 1] >= 0)
                self.assertTrue(all_below_image_size)
                self.assertTrue(all_above_zero)

        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)
            image_inputs = self.image_processor_tester.prepare_image_inputs()
            pre_processed_images = image_processor.preprocess(image_inputs, return_tensors="pt")
            outputs = self.image_processor_tester.prepare_keypoint_detection_output(**pre_processed_images)

            tuple_image_sizes = [(image.size[0], image.size[1]) for image in image_inputs]
            tuple_post_processed_outputs = image_processor.post_process_keypoint_detection(outputs, tuple_image_sizes)

            check_post_processed_output(tuple_post_processed_outputs, tuple_image_sizes)

            tensor_image_sizes = torch.tensor([image.size for image in image_inputs]).flip(1)
            tensor_post_processed_outputs = image_processor.post_process_keypoint_detection(
                outputs, tensor_image_sizes
            )

            check_post_processed_output(tensor_post_processed_outputs, tensor_image_sizes)