# Copyright 2022 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

from datasets import load_dataset

from transformers.image_utils import load_image
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 ImageProcessingTestMixin, prepare_image_inputs
from ...test_processing_common import url_to_local_path


if is_torch_available():
    import torch

if is_vision_available():
    from transformers import MobileViTImageProcessor

    if is_torchvision_available():
        from transformers import MobileViTImageProcessorFast


class MobileViTImageProcessingTester:
    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_center_crop=True,
        crop_size=None,
        do_flip_channel_order=True,
        do_reduce_labels=False,
    ):
        size = size if size is not None else {"shortest_edge": 20}
        crop_size = crop_size if crop_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_center_crop = do_center_crop
        self.crop_size = crop_size
        self.do_flip_channel_order = do_flip_channel_order
        self.do_reduce_labels = do_reduce_labels

    def prepare_image_processor_dict(self):
        return {
            "do_resize": self.do_resize,
            "size": self.size,
            "do_center_crop": self.do_center_crop,
            "crop_size": self.crop_size,
            "do_flip_channel_order": self.do_flip_channel_order,
            "do_reduce_labels": self.do_reduce_labels,
        }

    def expected_output_image_shape(self, images):
        return self.num_channels, self.crop_size["height"], self.crop_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,
        )


def prepare_semantic_single_inputs():
    ds = load_dataset("hf-internal-testing/fixtures_ade20k", split="test")
    example = ds[0]
    return example["image"], example["map"]


def prepare_semantic_batch_inputs():
    ds = load_dataset("hf-internal-testing/fixtures_ade20k", split="test")
    return list(ds["image"][:2]), list(ds["map"][:2])


@require_torch
@require_vision
class MobileViTImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    image_processing_class = MobileViTImageProcessor if is_vision_available() else None
    fast_image_processing_class = MobileViTImageProcessorFast if is_torchvision_available() else None

    def setUp(self):
        super().setUp()
        self.image_processor_tester = MobileViTImageProcessingTester(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_processor_list:
            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_center_crop"))
            self.assertTrue(hasattr(image_processing, "center_crop"))
            self.assertTrue(hasattr(image_processing, "do_flip_channel_order"))
            self.assertTrue(hasattr(image_processing, "do_reduce_labels"))

    def test_image_processor_from_dict_with_kwargs(self):
        for image_processing_class in self.image_processor_list:
            image_processor = self.image_processing_class.from_dict(self.image_processor_dict)
            self.assertEqual(image_processor.size, {"shortest_edge": 20})
            self.assertEqual(image_processor.crop_size, {"height": 18, "width": 18})
            self.assertEqual(image_processor.do_reduce_labels, False)

            image_processor = self.image_processing_class.from_dict(
                self.image_processor_dict, size=42, crop_size=84, do_reduce_labels=True
            )
            self.assertEqual(image_processor.size, {"shortest_edge": 42})
            self.assertEqual(image_processor.crop_size, {"height": 84, "width": 84})
            self.assertEqual(image_processor.do_reduce_labels, True)

    def test_call_segmentation_maps(self):
        for image_processing_class in self.image_processor_list:
            # Initialize image_processing
            image_processing = self.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)
            maps = []
            for image in image_inputs:
                self.assertIsInstance(image, torch.Tensor)
                maps.append(torch.zeros(image.shape[-2:]).long())

            # Test not batched input
            encoding = image_processing(image_inputs[0], maps[0], return_tensors="pt")
            self.assertEqual(
                encoding["pixel_values"].shape,
                (
                    1,
                    self.image_processor_tester.num_channels,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(
                encoding["labels"].shape,
                (
                    1,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(encoding["labels"].dtype, torch.long)
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 255)

            # Test batched
            encoding = image_processing(image_inputs, maps, return_tensors="pt")
            self.assertEqual(
                encoding["pixel_values"].shape,
                (
                    self.image_processor_tester.batch_size,
                    self.image_processor_tester.num_channels,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(
                encoding["labels"].shape,
                (
                    self.image_processor_tester.batch_size,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(encoding["labels"].dtype, torch.long)
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 255)

            # Test not batched input (PIL images)
            image, segmentation_map = prepare_semantic_single_inputs()

            encoding = image_processing(image, segmentation_map, return_tensors="pt")
            self.assertEqual(
                encoding["pixel_values"].shape,
                (
                    1,
                    self.image_processor_tester.num_channels,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(
                encoding["labels"].shape,
                (
                    1,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(encoding["labels"].dtype, torch.long)
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 255)

            # Test batched input (PIL images)
            images, segmentation_maps = prepare_semantic_batch_inputs()

            encoding = image_processing(images, segmentation_maps, return_tensors="pt")
            self.assertEqual(
                encoding["pixel_values"].shape,
                (
                    2,
                    self.image_processor_tester.num_channels,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(
                encoding["labels"].shape,
                (
                    2,
                    self.image_processor_tester.crop_size["height"],
                    self.image_processor_tester.crop_size["width"],
                ),
            )
            self.assertEqual(encoding["labels"].dtype, torch.long)
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 255)

    def test_reduce_labels(self):
        for image_processing_class in self.image_processor_list:
            # Initialize image_processing
            image_processing = self.image_processing_class(**self.image_processor_dict)

            # ADE20k has 150 classes, and the background is included, so labels should be between 0 and 150
            image, map = prepare_semantic_single_inputs()
            encoding = image_processing(image, map, return_tensors="pt")
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 150)

            image_processing.do_reduce_labels = True
            encoding = image_processing(image, map, return_tensors="pt")
            self.assertTrue(encoding["labels"].min().item() >= 0)
            self.assertTrue(encoding["labels"].max().item() <= 255)

    @require_vision
    @require_torch
    def test_slow_fast_equivalence(self):
        if not self.test_slow_image_processor or not self.test_fast_image_processor:
            self.skipTest(reason="Skipping slow/fast equivalence test")

        if self.image_processing_class is None or self.fast_image_processing_class is None:
            self.skipTest(reason="Skipping slow/fast equivalence test as one of the image processors is not defined")

        # Test with single image
        dummy_image = load_image(url_to_local_path("http://images.cocodataset.org/val2017/000000039769.jpg"))
        image_processor_slow = self.image_processing_class(**self.image_processor_dict)
        image_processor_fast = self.fast_image_processing_class(**self.image_processor_dict)

        encoding_slow = image_processor_slow(dummy_image, return_tensors="pt")
        encoding_fast = image_processor_fast(dummy_image, return_tensors="pt")
        self._assert_slow_fast_tensors_equivalence(encoding_slow.pixel_values, encoding_fast.pixel_values)

        # Test with single image and segmentation map
        image, segmentation_map = prepare_semantic_single_inputs()

        encoding_slow = image_processor_slow(image, segmentation_map, return_tensors="pt")
        encoding_fast = image_processor_fast(image, segmentation_map, return_tensors="pt")
        self._assert_slow_fast_tensors_equivalence(encoding_slow.pixel_values, encoding_fast.pixel_values)
        torch.testing.assert_close(encoding_slow.labels, encoding_fast.labels, atol=1e-1, rtol=1e-3)
