# Copyright 2021 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 json
import os
import tempfile
import unittest

import numpy as np
import pytest
import requests
from datasets import load_dataset

from transformers import AutoImageProcessor
from transformers.testing_utils import (
    check_json_file_has_correct_format,
    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 ImageProcessingTestMixin, prepare_image_inputs


if is_torch_available():
    import torch

if is_vision_available():
    from PIL import Image


class ImageGPTImageProcessingTester:
    def __init__(
        self,
        parent,
        batch_size=7,
        num_channels=3,
        image_size=18,
        min_resolution=30,
        max_resolution=400,
        do_resize=True,
        size=None,
        do_normalize=True,
    ):
        size = size if size is not None else {"height": 18, "width": 18}
        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_normalize = do_normalize

    def prepare_image_processor_dict(self):
        return {
            # here we create 2 clusters for the sake of simplicity
            "clusters": np.asarray(
                [
                    [0.8866443634033203, 0.6618829369544983, 0.3891746401786804],
                    [-0.6042559146881104, -0.02295008860528469, 0.5423797369003296],
                ]
            ),
            "do_resize": self.do_resize,
            "size": self.size,
            "do_normalize": self.do_normalize,
        }

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

    def prepare_image_inputs(self, equal_resolution=False, numpify=False, torchify=False):
        return prepare_image_inputs(
            batch_size=self.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,
        )


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

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

    @slow
    @require_torch_accelerator
    @require_vision
    @pytest.mark.torch_compile_test
    def test_can_compile_torchvision_backend(self):
        # Test compilation with torchvision backend (equivalent to fast processor)
        if "torchvision" not in self.image_processing_classes:
            self.skipTest("Skipping compilation test as torchvision backend is not available")

        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.input_ids.float(), output_compiled.input_ids.float(), atol=1e-4, rtol=1e-4, mean_atol=1e-5
        )

    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, "clusters"))
            self.assertTrue(hasattr(image_processing, "do_resize"))
            self.assertTrue(hasattr(image_processing, "size"))
            self.assertTrue(hasattr(image_processing, "do_normalize"))

    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": 18, "width": 18})

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

    def test_image_processor_to_json_string(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor = image_processing_class(**self.image_processor_dict)
            obj = json.loads(image_processor.to_json_string())
            for key, value in self.image_processor_dict.items():
                if key == "clusters":
                    self.assertTrue(np.array_equal(value, obj[key]))
                else:
                    self.assertEqual(obj[key], value)

    def test_image_processor_to_json_file(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_first = image_processing_class(**self.image_processor_dict)

            with tempfile.TemporaryDirectory() as tmpdirname:
                json_file_path = os.path.join(tmpdirname, "image_processor.json")
                image_processor_first.to_json_file(json_file_path)
                image_processor_second = image_processing_class.from_json_file(json_file_path).to_dict()

            image_processor_first = image_processor_first.to_dict()
            for key, value in image_processor_first.items():
                if key == "clusters":
                    self.assertTrue(np.array_equal(value, image_processor_second[key]))
                else:
                    self.assertEqual(image_processor_first[key], value)

    def test_image_processor_from_and_save_pretrained(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_first = image_processing_class(**self.image_processor_dict)

            with tempfile.TemporaryDirectory() as tmpdirname:
                image_processor_first.save_pretrained(tmpdirname)
                image_processor_second = image_processing_class.from_pretrained(tmpdirname).to_dict()

            image_processor_first = image_processor_first.to_dict()
            for key, value in image_processor_first.items():
                if key == "clusters":
                    self.assertTrue(np.array_equal(value, image_processor_second[key]))
                else:
                    self.assertEqual(value, value)

    def test_image_processor_save_load_with_autoimageprocessor(self):
        for image_processing_class in self.image_processing_classes.values():
            image_processor_first = image_processing_class(**self.image_processor_dict)

            with tempfile.TemporaryDirectory() as tmpdirname:
                saved_file = image_processor_first.save_pretrained(tmpdirname)[0]
                check_json_file_has_correct_format(saved_file)

                image_processor_second = AutoImageProcessor.from_pretrained(tmpdirname)

            image_processor_first = image_processor_first.to_dict()
            image_processor_second = image_processor_second.to_dict()

            for key, value in image_processor_first.items():
                if key == "clusters":
                    self.assertTrue(np.array_equal(value, image_processor_second[key]))
                else:
                    self.assertEqual(value, value)

    @unittest.skip(reason="ImageGPT requires clusters at initialization")
    def test_init_without_params(self):
        pass

    # Override the test from ImageProcessingTestMixin as ImageGPT model takes input_ids as input
    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 = self.image_processor_tester.prepare_image_inputs(equal_resolution=False)
            for image in image_inputs:
                self.assertIsInstance(image, Image.Image)

            # Test not batched input
            encoded_images = image_processing(image_inputs[0], return_tensors="pt").input_ids
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(encoded_images)
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test batched
            encoded_images = image_processing(image_inputs, return_tensors="pt").input_ids
            self.assertEqual(
                tuple(encoded_images.shape), (self.image_processor_tester.batch_size, *expected_output_image_shape)
            )

    # Override the test from ImageProcessingTestMixin as ImageGPT model takes input_ids as input
    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 = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, numpify=True)
            for image in image_inputs:
                self.assertIsInstance(image, np.ndarray)

            # Test not batched input
            encoded_images = image_processing(image_inputs[0], return_tensors="pt").input_ids
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(encoded_images)
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test batched
            encoded_images = image_processing(image_inputs, return_tensors="pt").input_ids
            self.assertEqual(
                tuple(encoded_images.shape), (self.image_processor_tester.batch_size, *expected_output_image_shape)
            )

    @unittest.skip(reason="ImageGPT assumes clusters for 3 channels")
    def test_call_numpy_4_channels(self):
        pass

    # Override the test from ImageProcessingTestMixin as ImageGPT model takes input_ids as input
    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 = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, torchify=True)
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)

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

            # Test not batched input
            encoded_images = image_processing(image_inputs[0], return_tensors="pt").input_ids
            self.assertEqual(tuple(encoded_images.shape), (1, *expected_output_image_shape))

            # Test batched
            encoded_images = image_processing(image_inputs, return_tensors="pt").input_ids
            self.assertEqual(
                tuple(encoded_images.shape),
                (self.image_processor_tester.batch_size, *expected_output_image_shape),
            )

    # For quantization-based processors, use absolute tolerance only to avoid infinity issues
    @require_vision
    @require_torch
    def test_backends_equivalence(self):
        """Test equivalence across backends for quantization-based processors."""
        if len(self.image_processing_classes) < 2:
            self.skipTest(reason="Skipping backends equivalence test as there are less than 2 backends")

        dummy_image = Image.open(
            requests.get("http://images.cocodataset.org/val2017/000000039769.jpg", stream=True).raw
        )

        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_image, return_tensors="pt")

        backend_names = list(encodings.keys())
        reference_backend = backend_names[0]
        reference_input_ids = encodings[reference_backend].input_ids.float()

        for backend_name in backend_names[1:]:
            self._assert_tensors_equivalence(
                reference_input_ids, encodings[backend_name].input_ids.float(), atol=1.0, rtol=0
            )

    @require_vision
    @require_torch
    def test_backends_equivalence_batched(self):
        """Test batched equivalence across backends for quantization-based processors."""
        if len(self.image_processing_classes) < 2:
            self.skipTest(reason="Skipping backends equivalence test as there are less than 2 backends")

        if hasattr(self.image_processor_tester, "do_center_crop") and self.image_processor_tester.do_center_crop:
            self.skipTest(
                reason="Skipping as do_center_crop is True and center_crop functions are not equivalent for fast and slow processors"
            )

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

        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_input_ids = encodings[reference_backend].input_ids.float()

        for backend_name in backend_names[1:]:
            self._assert_tensors_equivalence(
                reference_input_ids, encodings[backend_name].input_ids.float(), atol=1.0, rtol=0
            )

    @slow
    @require_torch_accelerator
    @require_vision
    @pytest.mark.torch_compile_test
    def test_can_compile_fast_image_processor(self):
        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 = 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.input_ids.float(), output_compiled.input_ids.float(), atol=1.0, rtol=0
        )


def prepare_images():
    # we use revision="refs/pr/1" until the PR is merged
    # https://hf.co/datasets/hf-internal-testing/fixtures_image_utils/discussions/1
    dataset = load_dataset("hf-internal-testing/fixtures_image_utils", split="test", revision="refs/pr/1")

    image1 = dataset[4]["image"]
    image2 = dataset[5]["image"]

    images = [image1, image2]

    return images


@require_vision
@require_torch
class ImageGPTImageProcessorIntegrationTest(unittest.TestCase):
    @slow
    def test_image(self):
        from transformers import ImageGPTImageProcessor

        image_processing = ImageGPTImageProcessor.from_pretrained("openai/imagegpt-small")

        images = prepare_images()

        # test non-batched
        encoding = image_processing(images[0], return_tensors="pt")

        self.assertIsInstance(encoding.input_ids, torch.LongTensor)
        self.assertEqual(encoding.input_ids.shape, (1, 1024))

        expected_slice = [306, 191, 191]
        self.assertEqual(encoding.input_ids[0, :3].tolist(), expected_slice)

        # test batched
        encoding = image_processing(images, return_tensors="pt")

        self.assertIsInstance(encoding.input_ids, torch.LongTensor)
        self.assertEqual(encoding.input_ids.shape, (2, 1024))

        expected_slice = [303, 13, 13]
        self.assertEqual(encoding.input_ids[1, -3:].tolist(), expected_slice)
