# Copyright 2025 HuggingFace Inc.
#
# 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
# applicable 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, is_vision_available

from ...test_image_processing_common import ImageProcessingTestMixin


if is_vision_available():
    from PIL import Image

if is_torch_available():
    import torch


class Idefics2ImageProcessingTester:
    def __init__(
        self,
        parent,
        batch_size=7,
        num_channels=3,
        num_images=1,
        image_size=18,
        min_resolution=30,
        max_resolution=400,
        do_resize=True,
        size=None,
        do_rescale=True,
        rescale_factor=1 / 255,
        do_normalize=True,
        image_mean=[0.5, 0.5, 0.5],
        image_std=[0.5, 0.5, 0.5],
        do_convert_rgb=True,
        do_pad=True,
        do_image_splitting=True,
    ):
        size = size if size is not None else {"shortest_edge": 378, "longest_edge": 980}
        self.parent = parent
        self.batch_size = batch_size
        self.num_channels = num_channels
        self.num_images = num_images
        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_normalize = do_normalize
        self.image_mean = image_mean
        self.image_std = image_std
        self.do_rescale = do_rescale
        self.rescale_factor = rescale_factor
        self.do_convert_rgb = do_convert_rgb
        self.do_pad = do_pad
        self.do_image_splitting = do_image_splitting

    def prepare_image_processor_dict(self):
        return {
            "do_convert_rgb": self.do_convert_rgb,
            "do_resize": self.do_resize,
            "size": self.size,
            "do_rescale": self.do_rescale,
            "rescale_factor": self.rescale_factor,
            "do_normalize": self.do_normalize,
            "image_mean": self.image_mean,
            "image_std": self.image_std,
            "do_pad": self.do_pad,
            "do_image_splitting": self.do_image_splitting,
        }

    def get_expected_values(self, image_inputs, batched=False):
        if not batched:
            shortest_edge = self.size["shortest_edge"]
            longest_edge = self.size["longest_edge"]
            image = image_inputs[0]
            if isinstance(image, Image.Image):
                w, h = image.size
            elif isinstance(image, np.ndarray):
                h, w = image.shape[0], image.shape[1]
            else:
                h, w = image.shape[1], image.shape[2]

            aspect_ratio = w / h
            if w > h and w >= longest_edge:
                w = longest_edge
                h = int(w / aspect_ratio)
            elif h > w and h >= longest_edge:
                h = longest_edge
                w = int(h * aspect_ratio)
            w = max(w, shortest_edge)
            h = max(h, shortest_edge)
            expected_height = h
            expected_width = w
        else:
            expected_values = []
            for images in image_inputs:
                for image in images:
                    expected_height, expected_width = self.get_expected_values([image])
                    expected_values.append((expected_height, expected_width))
            expected_height = max(expected_values, key=lambda item: item[0])[0]
            expected_width = max(expected_values, key=lambda item: item[1])[1]

        return expected_height, expected_width

    def expected_output_image_shape(self, images):
        height, width = self.get_expected_values(images, batched=True)
        effective_nb_images = self.num_images * 5 if self.do_image_splitting else 1
        return effective_nb_images, self.num_channels, height, width

    def prepare_image_inputs(
        self,
        batch_size=None,
        min_resolution=None,
        max_resolution=None,
        num_channels=None,
        num_images=None,
        size_divisor=None,
        equal_resolution=False,
        numpify=False,
        torchify=False,
    ):
        assert not (numpify and torchify), "You cannot specify both numpy and PyTorch tensors at the same time"

        batch_size = batch_size if batch_size is not None else self.batch_size
        min_resolution = min_resolution if min_resolution is not None else self.min_resolution
        max_resolution = max_resolution if max_resolution is not None else self.max_resolution
        num_channels = num_channels if num_channels is not None else self.num_channels
        num_images = num_images if num_images is not None else self.num_images

        images_list = []
        for i in range(batch_size):
            images = []
            for j in range(num_images):
                if equal_resolution:
                    width = height = max_resolution
                else:
                    if size_divisor is not None:
                        min_resolution = max(size_divisor, min_resolution)
                    width, height = np.random.choice(np.arange(min_resolution, max_resolution), 2)
                images.append(np.random.randint(255, size=(num_channels, width, height), dtype=np.uint8))
            images_list.append(images)

        if not numpify and not torchify:
            images_list = [[Image.fromarray(np.moveaxis(image, 0, -1)) for image in images] for images in images_list]

        if torchify:
            images_list = [[torch.from_numpy(image) for image in images] for images in images_list]

        if numpify:
            images_list = [[image.transpose(1, 2, 0) for image in images] for images in images_list]

        return images_list


@require_torch
@require_vision
class Idefics2ImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    def setUp(self):
        super().setUp()
        self.image_processor_tester = Idefics2ImageProcessingTester(self)

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

    def test_image_processor_properties(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_convert_rgb"))
            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_normalize"))
            self.assertTrue(hasattr(image_processing, "image_mean"))
            self.assertTrue(hasattr(image_processing, "image_std"))
            self.assertTrue(hasattr(image_processing, "do_pad"))
            self.assertTrue(hasattr(image_processing, "do_image_splitting"))

    def test_call_numpy(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, numpify=True)
            for sample_images in image_inputs:
                for image in sample_images:
                    self.assertIsInstance(image, np.ndarray)

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

            encoded_images = image_processing(image_inputs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)
            self.assertEqual(
                tuple(encoded_images.shape), (self.image_processor_tester.batch_size, *expected_output_image_shape)
            )

    def test_call_numpy_4_channels(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_dict = self.image_processor_dict.copy()
            image_processor_dict["image_mean"] = [0.5, 0.5, 0.5, 0.5]
            image_processor_dict["image_std"] = [0.5, 0.5, 0.5, 0.5]
            image_processing = image_processing_class(**image_processor_dict)
            self.image_processor_tester.num_channels = 4
            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, numpify=True)

            for sample_images in image_inputs:
                for image in sample_images:
                    self.assertIsInstance(image, np.ndarray)

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

            encoded_images = image_processing(
                image_inputs, input_data_format="channels_last", return_tensors="pt"
            ).pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)
            self.assertEqual(
                tuple(encoded_images.shape), (self.image_processor_tester.batch_size, *expected_output_image_shape)
            )

    def test_call_pil(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False)
            for images in image_inputs:
                for image in images:
                    self.assertIsInstance(image, Image.Image)

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

            encoded_images = image_processing(image_inputs, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)
            self.assertEqual(
                tuple(encoded_images.shape), (self.image_processor_tester.batch_size, *expected_output_image_shape)
            )

    def test_call_pytorch(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, torchify=True)

            for images in image_inputs:
                for image in images:
                    self.assertIsInstance(image, torch.Tensor)

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

            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)
            encoded_images = image_processing(image_inputs, return_tensors="pt").pixel_values
            self.assertEqual(
                tuple(encoded_images.shape),
                (self.image_processor_tester.batch_size, *expected_output_image_shape),
            )

    def test_image_splitting(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_dict = self.image_processor_dict.copy()
            image_processor_dict["do_image_splitting"] = True
            image_processing = image_processing_class(**image_processor_dict)

            image_inputs = self.image_processor_tester.prepare_image_inputs(
                equal_resolution=True, torchify=True, num_images=1
            )

            result = image_processing(image_inputs[0], return_tensors="pt")
            self.assertEqual(result.pixel_values.shape[1], 5)

            image_processor_dict["do_image_splitting"] = False
            image_processing = image_processing_class(**image_processor_dict)

            result = image_processing(image_inputs[0], return_tensors="pt")
            if len(result.pixel_values.shape) == 5:
                self.assertEqual(result.pixel_values.shape[1], 1)
            else:
                self.assertEqual(result.pixel_values.shape[1], self.image_processor_tester.num_channels)

    def test_pixel_attention_mask(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_dict = self.image_processor_dict.copy()
            image_processor_dict["do_pad"] = True
            image_processing = image_processing_class(**image_processor_dict)

            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, torchify=True)

            result = image_processing(image_inputs, return_tensors="pt")
            self.assertIn("pixel_attention_mask", result)

            self.assertEqual(result.pixel_attention_mask.shape[-2:], result.pixel_values.shape[-2:])

            image_processor_dict["do_pad"] = False
            image_processor_dict["do_image_splitting"] = False
            image_processing = image_processing_class(**image_processor_dict)

            equal_size_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=True, torchify=True)

            result = image_processing(equal_size_inputs, return_tensors="pt")
            self.assertNotIn("pixel_attention_mask", result)

    def test_convert_rgb(self):
        for image_processing_class in self.image_processing_classes.values():
            rgba_image = Image.new("RGBA", (100, 100), (255, 0, 0, 128))

            image_processor_dict = self.image_processor_dict.copy()
            image_processor_dict["do_convert_rgb"] = True
            image_processing = image_processing_class(**image_processor_dict)

            result = image_processing([rgba_image], return_tensors="pt")
            self.assertIsNotNone(result.pixel_values)
            rgb_image = rgba_image.convert("RGB")

            image_processor_dict["do_convert_rgb"] = False
            image_processing = image_processing_class(**image_processor_dict)

            result = image_processing([rgb_image], return_tensors="pt")
            self.assertIsNotNone(result.pixel_values)

            rgb_image = Image.new("RGB", (100, 100), (255, 0, 0))
            result = image_processing([rgb_image], return_tensors="pt")
            self.assertIsNotNone(result.pixel_values)

    def test_backends_equivalence_batched(self):
        """Override to also compare pixel_attention_mask across backends."""
        if len(self.image_processing_classes) < 2:
            self.skipTest(reason="Skipping backends equivalence test as there are less than 2 backends")

        dummy_images = self.image_processor_tester.prepare_image_inputs(
            equal_resolution=False, num_images=5, torchify=True
        )
        indices_to_pop = [i if np.random.random() < 0.5 else None for i in range(len(dummy_images))]
        for i in indices_to_pop:
            if i is not None:
                dummy_images[i].pop()

        encodings = {}
        for backend_name, image_processing_class in self.image_processing_classes.items():
            image_processor = image_processing_class(**self.image_processor_dict)
            encodings[backend_name] = image_processor(dummy_images, return_tensors="pt")

        backend_names = list(encodings.keys())
        reference_backend = backend_names[0]
        reference_pixel_values = encodings[reference_backend].pixel_values
        reference_mask = encodings[reference_backend].pixel_attention_mask.float()

        for backend_name in backend_names[1:]:
            self._assert_tensors_equivalence(reference_pixel_values, encodings[backend_name].pixel_values)
            self._assert_tensors_equivalence(reference_mask, encodings[backend_name].pixel_attention_mask.float())
