# Copyright 2024 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
# limitations under the License.

import unittest

import numpy as np
import pytest

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

from ...test_image_processing_common import ImageProcessingTester, ImageProcessingTestMixin


if is_torch_available():
    import torch

if is_vision_available():
    from PIL import Image


class PixtralImageProcessingTester(ImageProcessingTester):
    def __init__(self, **kwargs):
        # Random test inputs kwargs
        kwargs.setdefault("max_num_images_per_sample", 3)

        # Image processor init kwargs
        kwargs.setdefault("size", {"longest_edge": 24})
        kwargs.setdefault("patch_size", {"height": 8, "width": 8})

        super().__init__(**kwargs)

    def expected_output_image_shape(self, images):
        if not isinstance(images, (list, tuple)):
            images = [images]

        batch_size = len(images)
        return_height, return_width = 0, 0
        for image in images:
            if isinstance(image, Image.Image):
                width, height = image.size
            elif isinstance(image, np.ndarray):
                height, width = image.shape[:2]
            elif isinstance(image, torch.Tensor):
                height, width = image.shape[-2:]

            max_height = max_width = self.size.get("longest_edge")

            ratio = max(height / max_height, width / max_width)
            if ratio > 1:
                height = int(np.floor(height / ratio))
                width = int(np.floor(width / ratio))

            patch_height, patch_width = self.patch_size["height"], self.patch_size["width"]
            num_height_tokens = (height - 1) // patch_height + 1
            num_width_tokens = (width - 1) // patch_width + 1

            return_height = max(num_height_tokens * patch_height, return_height)
            return_width = max(num_width_tokens * patch_width, return_width)

        return batch_size, self.num_channels, return_height, return_width


@require_torch
@require_vision
class PixtralImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    image_processor_tester_class = PixtralImageProcessingTester

    def test_call_without_padding(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processing = image_processing_class(**self.image_processor_dict)
            image_inputs = [
                np.zeros((30, 60, 3), dtype=np.uint8),
                np.zeros((60, 30, 3), dtype=np.uint8),
            ]

            encoded_images = image_processing(image_inputs, do_pad=False).pixel_values

            self.assertIsInstance(encoded_images, list)
            self.assertEqual([image.shape[-2:] for image in encoded_images], [(16, 24), (24, 16)])

            padded_images = image_processing(image_inputs, do_pad=True).pixel_values
            self.assertEqual(padded_images.shape[-2:], (24, 24))

    def test_rescale_and_normalize_does_not_modify_input(self):
        image_processor = self.image_processing_classes["torchvision"](**self.image_processor_dict)
        image = torch.rand(3, 8, 8)
        original_image = image.clone()

        image_processor.rescale_and_normalize(
            image,
            do_rescale=True,
            rescale_factor=image_processor.rescale_factor,
            do_normalize=True,
            image_mean=image_processor.image_mean,
            image_std=image_processor.image_std,
        )

        torch.testing.assert_close(image, original_image)

    # The following tests are overridden as PixtralImageProcessor can return images of different sizes
    # and thus doesn't support returning batched tensors

    def test_call_pil(self):
        for image_processing_class in self.image_processing_classes.values():
            # Initialize image_processing
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random PIL images
            image_inputs_list = self.image_processor_tester.prepare_image_inputs()
            for image in image_inputs_list:
                self.assertIsInstance(image, Image.Image)

            # Test not batched input
            encoded_images = image_processing(image_inputs_list[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list[0])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            encoded_images = image_processing(image_inputs_list, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list)
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

    def test_call_numpy(self):
        for image_processing_class in self.image_processing_classes.values():
            # Initialize image_processing
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random numpy tensors
            image_inputs_list = self.image_processor_tester.prepare_image_inputs(numpify=True)
            for image in image_inputs_list:
                self.assertIsInstance(image, np.ndarray)

            # Test not batched input
            encoded_images = image_processing(image_inputs_list[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list[0])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            batch_encoded_images = image_processing(image_inputs_list, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list)
            self.assertEqual(tuple(batch_encoded_images.shape), expected_output_image_shape)

    def test_call_pytorch(self):
        for image_processing_class in self.image_processing_classes.values():
            # Initialize image_processing
            image_processing = image_processing_class(**self.image_processor_dict)
            # create random PyTorch tensors
            image_inputs_list = self.image_processor_tester.prepare_image_inputs(torchify=True)
            for image in image_inputs_list:
                self.assertIsInstance(image, torch.Tensor)

            # Test not batched input
            encoded_images = image_processing(image_inputs_list[0], return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list[0])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            batch_encoded_images = image_processing(image_inputs_list, return_tensors="pt").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs_list)
            self.assertEqual(tuple(batch_encoded_images.shape), expected_output_image_shape)

    @slow
    @require_torch_accelerator
    @require_vision
    @pytest.mark.torch_compile_test
    def test_can_compile_torchvision_backend(self):
        if "torchvision" not in self.image_processing_classes:
            self.skipTest("Skipping compilation test as torchvision backend is not defined")

        torch.compiler.reset()
        input_image = torch.randint(0, 255, (3, 224, 224), dtype=torch.uint8)
        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
        )

    @unittest.skip(reason="PixtralImageProcessor doesn't treat 4 channel PIL and numpy consistently yet")  # FIXME Amy
    def test_call_numpy_4_channels(self):
        pass