# 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_torchvision_available, is_vision_available

from ...test_image_processing_common import ImageProcessingTester, ImageProcessingTestMixin


if is_vision_available():
    from PIL import Image

    from transformers.models.idefics2.image_processing_pil_idefics2 import convert_to_rgb as convert_to_rgb_pil

if is_torch_available():
    import torch

if is_torchvision_available():
    from transformers.models.idefics2.image_processing_idefics2 import convert_to_rgb as convert_to_rgb_torch


class Idefics2ImageProcessingTester(ImageProcessingTester):
    def __init__(self, **kwargs):
        # Random test inputs kwargs
        kwargs.setdefault("num_images", 1)

        # Image processor init kwargs
        kwargs.setdefault("size", {"shortest_edge": 378, "longest_edge": 980})
        kwargs.setdefault("do_image_splitting", True)

        super().__init__(**kwargs)

    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):
    image_processor_tester_class = Idefics2ImageProcessingTester

    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_convert_rgb_png_trns(self):
        """RGB PNGs with a tRNS chunk must composite onto white (#49003)."""
        image = Image.new("RGB", (100, 100), (255, 0, 0))
        image.paste((0, 0, 255), (0, 0, 50, 50))
        image.info["transparency"] = (255, 0, 0)
        self.assertEqual(image.mode, "RGB")

        for convert_to_rgb in (convert_to_rgb_torch, convert_to_rgb_pil):
            out = convert_to_rgb(image)
            self.assertEqual(out.mode, "RGB")
            self.assertEqual(out.getpixel((75, 75)), (255, 255, 255))
            self.assertEqual(out.getpixel((25, 25)), (0, 0, 255))

        plain = Image.new("RGB", (10, 10), (1, 2, 3))
        self.assertIs(convert_to_rgb_torch(plain), plain)
        self.assertIs(convert_to_rgb_pil(plain), plain)

    def test_backends_equivalence_batched(self):
        """Override to use batches where samples have different numbers of images."""
        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]
        for backend_name in backend_names[1:]:
            self._assert_encodings_equivalence(
                encodings[reference_backend], encodings[backend_name], reference_backend, backend_name
            )