# Copyright 2025 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
import pytest
from parameterized import parameterized

from transformers.testing_utils import (
    require_torch,
    require_torch_accelerator,
    require_vision,
    slow,
    torch_device,
)
from transformers.utils import is_torch_available

from ...test_image_processing_common import ImageProcessingTestMixin, prepare_image_inputs


if is_torch_available():
    import torch

    from transformers.models.efficientloftr.modeling_efficientloftr import EfficientLoFTRKeypointMatchingOutput


def random_array(size):
    return np.random.randint(255, size=size)


def random_tensor(size):
    return torch.rand(size)


class EfficientLoFTRImageProcessingTester:
    """Tester for EfficientLoFTRImageProcessor"""

    def __init__(
        self,
        parent,
        batch_size=6,
        num_channels=3,
        image_size=18,
        min_resolution=30,
        max_resolution=400,
        do_resize=True,
        size=None,
        do_grayscale=True,
    ):
        size = size if size is not None else {"height": 480, "width": 640}
        self.parent = parent
        self.batch_size = batch_size
        self.num_channels = num_channels
        self.image_size = image_size
        self.min_resolution = min_resolution
        self.max_resolution = max_resolution
        self.do_resize = do_resize
        self.size = size
        self.do_grayscale = do_grayscale

    def prepare_image_processor_dict(self):
        return {
            "do_resize": self.do_resize,
            "size": self.size,
            "do_grayscale": self.do_grayscale,
        }

    def expected_output_image_shape(self, images):
        return 2, self.num_channels, self.size["height"], self.size["width"]

    def prepare_image_inputs(self, equal_resolution=False, numpify=False, torchify=False, pairs=True, batch_size=None):
        batch_size = batch_size if batch_size is not None else self.batch_size
        image_inputs = prepare_image_inputs(
            batch_size=batch_size,
            num_channels=self.num_channels,
            min_resolution=self.min_resolution,
            max_resolution=self.max_resolution,
            equal_resolution=equal_resolution,
            numpify=numpify,
            torchify=torchify,
        )
        if pairs:
            image_inputs = [image_inputs[i : i + 2] for i in range(0, len(image_inputs), 2)]
        return image_inputs

    def prepare_keypoint_matching_output(self, pixel_values):
        """Prepare a fake output for the keypoint matching model with random matches between 50 keypoints per image."""
        max_number_keypoints = 50
        batch_size = len(pixel_values)
        keypoints = torch.zeros((batch_size, 2, max_number_keypoints, 2))
        matches = torch.full((batch_size, 2, max_number_keypoints), -1, dtype=torch.int)
        scores = torch.zeros((batch_size, 2, max_number_keypoints))
        for i in range(batch_size):
            random_number_keypoints0 = np.random.randint(10, max_number_keypoints)
            random_number_keypoints1 = np.random.randint(10, max_number_keypoints)
            random_number_matches = np.random.randint(5, min(random_number_keypoints0, random_number_keypoints1))
            keypoints[i, 0, :random_number_keypoints0] = torch.rand((random_number_keypoints0, 2))
            keypoints[i, 1, :random_number_keypoints1] = torch.rand((random_number_keypoints1, 2))
            random_matches_indices0 = torch.randperm(random_number_keypoints1, dtype=torch.int)[:random_number_matches]
            random_matches_indices1 = torch.randperm(random_number_keypoints0, dtype=torch.int)[:random_number_matches]
            matches[i, 0, random_matches_indices1] = random_matches_indices0
            matches[i, 1, random_matches_indices0] = random_matches_indices1
            scores[i, 0, random_matches_indices1] = torch.rand((random_number_matches,))
            scores[i, 1, random_matches_indices0] = torch.rand((random_number_matches,))
        return EfficientLoFTRKeypointMatchingOutput(keypoints=keypoints, matches=matches, matching_scores=scores)


@require_torch
@require_vision
class EfficientLoFTRImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    def setUp(self) -> None:
        super().setUp()
        self.image_processor_tester = EfficientLoFTRImageProcessingTester(self)

    @property
    def image_processor_dict(self):
        return self.image_processor_tester.prepare_image_processor_dict()

    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"))

    def test_image_processor_from_dict_with_kwargs(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)
            self.assertEqual(image_processor.size, {"height": 480, "width": 640})

            image_processor = image_processing_class.from_dict(
                self.image_processor_dict, size={"height": 42, "width": 42}
            )
            self.assertEqual(image_processor.size, {"height": 42, "width": 42})

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

    def test_number_and_format_of_images_in_input(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)

            # Cases where the number of images and the format of lists in the input is correct
            image_input = self.image_processor_tester.prepare_image_inputs(pairs=False, batch_size=2)
            image_processed = image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual((1, 2, 3, 480, 640), tuple(image_processed["pixel_values"].shape))

            image_input = self.image_processor_tester.prepare_image_inputs(pairs=True, batch_size=2)
            image_processed = image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual((1, 2, 3, 480, 640), tuple(image_processed["pixel_values"].shape))

            image_input = self.image_processor_tester.prepare_image_inputs(pairs=True, batch_size=4)
            image_processed = image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual((2, 2, 3, 480, 640), tuple(image_processed["pixel_values"].shape))

            image_input = self.image_processor_tester.prepare_image_inputs(pairs=True, batch_size=6)
            image_processed = image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual((3, 2, 3, 480, 640), tuple(image_processed["pixel_values"].shape))

            # Cases where the number of images or the format of lists in the input is incorrect
            ## List of 4 images
            image_input = self.image_processor_tester.prepare_image_inputs(pairs=False, batch_size=4)
            with self.assertRaises(ValueError) as cm:
                image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual(ValueError, cm.exception.__class__)

            ## List of 3 images
            image_input = self.image_processor_tester.prepare_image_inputs(pairs=False, batch_size=3)
            with self.assertRaises(ValueError) as cm:
                image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual(ValueError, cm.exception.__class__)

            ## List of 2 pairs and 1 image
            image_input = self.image_processor_tester.prepare_image_inputs(pairs=True, batch_size=3)
            with self.assertRaises(ValueError) as cm:
                image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual(ValueError, cm.exception.__class__)

    @parameterized.expand(
        [
            ([random_array((3, 100, 200)), random_array((3, 100, 200))], (1, 2, 3, 480, 640)),
            ([[random_array((3, 100, 200)), random_array((3, 100, 200))]], (1, 2, 3, 480, 640)),
            ([random_tensor((3, 100, 200)), random_tensor((3, 100, 200))], (1, 2, 3, 480, 640)),
            ([random_tensor((3, 100, 200)), random_tensor((3, 100, 200))], (1, 2, 3, 480, 640)),
        ],
    )
    def test_valid_image_shape_in_input(self, image_input, output):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)
            image_processed = image_processor.preprocess(image_input, return_tensors="pt")
            self.assertEqual(output, tuple(image_processed["pixel_values"].shape))

    @parameterized.expand(
        [
            (random_array((3, 100, 200)),),
            ([random_array((3, 100, 200))],),
            (random_array((1, 3, 100, 200)),),
            ([[random_array((3, 100, 200))]],),
            ([[random_array((3, 100, 200))], [random_array((3, 100, 200))]],),
            ([random_array((1, 3, 100, 200)), random_array((1, 3, 100, 200))],),
            (random_array((1, 1, 3, 100, 200)),),
        ],
    )
    def test_invalid_image_shape_in_input(self, image_input):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class.from_dict(self.image_processor_dict)
            with self.assertRaises(ValueError) as cm:
                image_processor(image_input, return_tensors="pt")
            self.assertEqual(ValueError, cm.exception.__class__)

    def test_input_images_properly_paired(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(image_inputs, return_tensors="pt")
            self.assertEqual(len(pre_processed_images["pixel_values"].shape), 5)
            self.assertEqual(pre_processed_images["pixel_values"].shape[1], 2)

    def test_input_not_paired_images_raises_error(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(pairs=False)
            with self.assertRaises(ValueError):
                image_processor(image_inputs[0])

    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(image_inputs, return_tensors="pt")
            for image_pair in pre_processed_images["pixel_values"]:
                for image in image_pair:
                    self.assertTrue(
                        torch.all(image[0, ...] == image[1, ...]) and torch.all(image[1, ...] == image[2, ...])
                    )

    def test_call_numpy(self):
        # Test overwritten because SuperGlueImageProcessor combines images by pair to feed it into SuperGlue

        # Initialize image_processing
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random numpy tensors
            image_pairs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, numpify=True)
            for image_pair in image_pairs:
                self.assertEqual(len(image_pair), 2)

            expected_batch_size = int(self.image_processor_tester.batch_size / 2)

            # Test with 2 images
            encoded_images = image_processing(image_pairs[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs[0])
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test with list of pairs
            encoded_images = image_processing(image_pairs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs)
            self.assertEqual(tuple(encoded_images.shape), (expected_batch_size, *expected_output_image_shape))

            # Test without paired images
            image_pairs = self.image_processor_tester.prepare_image_inputs(
                equal_resolution=False, numpify=True, pairs=False
            )
            with self.assertRaises(ValueError):
                image_processing(image_pairs, return_tensors="pt").pixel_values

    def test_call_pil(self):
        # Test overwritten because SuperGlueImageProcessor combines images by pair to feed it into SuperGlue

        # Initialize image_processing
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random PIL images
            image_pairs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False)
            for image_pair in image_pairs:
                self.assertEqual(len(image_pair), 2)

            expected_batch_size = int(self.image_processor_tester.batch_size / 2)

            # Test with 2 images
            encoded_images = image_processing(image_pairs[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs[0])
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test with list of pairs
            encoded_images = image_processing(image_pairs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs)
            self.assertEqual(tuple(encoded_images.shape), (expected_batch_size, *expected_output_image_shape))

            # Test without paired images
            image_pairs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, pairs=False)
            with self.assertRaises(ValueError):
                image_processing(image_pairs, return_tensors="pt").pixel_values

    def test_call_pytorch(self):
        # Test overwritten because SuperGlueImageProcessor combines images by pair to feed it into SuperGlue

        # Initialize image_processing
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random PyTorch tensors
            image_pairs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, torchify=True)
            for image_pair in image_pairs:
                self.assertEqual(len(image_pair), 2)

            expected_batch_size = int(self.image_processor_tester.batch_size / 2)

            # Test with 2 images
            encoded_images = image_processing(image_pairs[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs[0])
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test with list of pairs
            encoded_images = image_processing(image_pairs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs)
            self.assertEqual(tuple(encoded_images.shape), (expected_batch_size, *expected_output_image_shape))

            # Test without paired images
            image_pairs = self.image_processor_tester.prepare_image_inputs(
                equal_resolution=False, torchify=True, pairs=False
            )
            with self.assertRaises(ValueError):
                image_processing(image_pairs, return_tensors="pt").pixel_values

    def test_image_processor_with_list_of_two_images(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)

            image_pairs = self.image_processor_tester.prepare_image_inputs(
                equal_resolution=False, numpify=True, batch_size=2, pairs=False
            )
            self.assertEqual(len(image_pairs), 2)
            self.assertTrue(isinstance(image_pairs[0], np.ndarray))
            self.assertTrue(isinstance(image_pairs[1], np.ndarray))

            expected_batch_size = 1
            encoded_images = image_processing(image_pairs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_pairs[0])
            self.assertEqual(tuple(encoded_images.shape), (expected_batch_size, *expected_output_image_shape))

    @require_torch
    def test_post_processing_keypoint_matching(self):
        def check_post_processed_output(post_processed_output, image_pair_size):
            for post_processed_output, (image_size0, image_size1) in zip(post_processed_output, image_pair_size):
                self.assertTrue("keypoints0" in post_processed_output)
                self.assertTrue("keypoints1" in post_processed_output)
                self.assertTrue("matching_scores" in post_processed_output)
                keypoints0 = post_processed_output["keypoints0"]
                keypoints1 = post_processed_output["keypoints1"]
                all_below_image_size0 = torch.all(keypoints0[:, 0] <= image_size0[1]) and torch.all(
                    keypoints0[:, 1] <= image_size0[0]
                )
                all_below_image_size1 = torch.all(keypoints1[:, 0] <= image_size1[1]) and torch.all(
                    keypoints1[:, 1] <= image_size1[0]
                )
                all_above_zero0 = torch.all(keypoints0[:, 0] >= 0) and torch.all(keypoints0[:, 1] >= 0)
                all_above_zero1 = torch.all(keypoints1[:, 0] >= 0) and torch.all(keypoints1[:, 1] >= 0)
                self.assertTrue(all_below_image_size0)
                self.assertTrue(all_below_image_size1)
                self.assertTrue(all_above_zero0)
                self.assertTrue(all_above_zero1)
                all_scores_different_from_minus_one = torch.all(post_processed_output["matching_scores"] != -1)
                self.assertTrue(all_scores_different_from_minus_one)

        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_matching_output(**pre_processed_images)

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

            check_post_processed_output(tuple_post_processed_outputs, tuple_image_sizes)

            tensor_image_sizes = torch.tensor(
                [(image_pair[0].size, image_pair[1].size) for image_pair in image_inputs]
            ).flip(2)
            tensor_post_processed_outputs = image_processor.post_process_keypoint_matching(outputs, tensor_image_sizes)

            check_post_processed_output(tensor_post_processed_outputs, tensor_image_sizes)

    @require_vision
    @require_torch
    def test_backends_equivalence(self):
        """Override base test since EfficientLoFTR requires image pairs."""
        if len(self.image_processing_classes) < 2:
            self.skipTest(reason="Skipping backends equivalence test as there are less than 2 backends")

        dummy_image = self.image_processor_tester.prepare_image_inputs(
            equal_resolution=False, numpify=True, batch_size=2, pairs=False
        )
        image_processor_pil = self.image_processing_classes["pil"](**self.image_processor_dict)
        image_processor_torchvision = self.image_processing_classes["torchvision"](**self.image_processor_dict)

        encoding_pil = image_processor_pil(dummy_image, return_tensors="pt")
        encoding_torchvision = image_processor_torchvision(dummy_image, return_tensors="pt")

        self._assert_tensors_equivalence(encoding_pil.pixel_values, encoding_torchvision.pixel_values)

    @slow
    @require_torch_accelerator
    @require_vision
    @pytest.mark.torch_compile_test
    def test_can_compile_torchvision_backend(self):
        """Override the generic test since EfficientLoFTR requires image pairs."""
        if "torchvision" not in self.image_processing_classes:
            self.skipTest("Skipping compilation test as torchvision image processor is not defined")

        torch.compiler.reset()
        input_image = self.image_processor_tester.prepare_image_inputs(equal_resolution=True, torchify=False)
        image_processor = self.image_processing_classes["torchvision"](**self.image_processor_dict)
        output_eager = image_processor(input_image, device=torch_device, return_tensors="pt")

        image_processor = torch.compile(image_processor, mode="reduce-overhead")
        output_compiled = image_processor(input_image, device=torch_device, return_tensors="pt")
        self._assert_tensors_equivalence(
            output_eager.pixel_values, output_compiled.pixel_values, atol=1e-4, rtol=1e-4, mean_atol=1e-5
        )
