# 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 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 ImageProcessingTester, ImageProcessingTestMixin


if is_torch_available():
    import torch


if is_vision_available():
    from PIL import Image

    from transformers.models.glm4v.image_processing_glm4v import smart_resize


class Glm4vImageProcessingTester(ImageProcessingTester):
    def __init__(self, **kwargs):
        # Random test inputs kwargs
        kwargs.setdefault("max_resolution", 80)

        # Image processor init kwargs
        kwargs.setdefault("temporal_patch_size", 2)
        kwargs.setdefault("patch_size", 14)
        kwargs.setdefault("merge_size", 2)
        kwargs.setdefault("size", {"longest_edge": 20, "shortest_edge": 10})

        super().__init__(**kwargs)

    def expected_output_image_shape(self, images):
        grid_t = 1
        hidden_dim = self.num_channels * self.temporal_patch_size * self.patch_size * self.patch_size
        seq_len = 0
        for image in images:
            if isinstance(image, list) and isinstance(image[0], Image.Image):
                image = np.stack([np.array(frame) for frame in image])
            elif hasattr(image, "shape"):
                pass
            else:
                image = np.array(image)
            if hasattr(image, "shape") and len(image.shape) >= 3:
                if isinstance(image, np.ndarray):
                    if len(image.shape) == 4:
                        height, width = image.shape[1:3]
                    elif len(image.shape) == 3:
                        height, width = image.shape[:2]
                    else:
                        height, width = self.min_resolution, self.min_resolution
                else:
                    height, width = image.shape[-2:]
            else:
                height, width = self.min_resolution, self.min_resolution

            resized_height, resized_width = smart_resize(
                self.temporal_patch_size,
                height,
                width,
                factor=self.patch_size * self.merge_size,
                min_pixels=self.size["shortest_edge"],
                max_pixels=self.size["longest_edge"],
            )
            grid_h, grid_w = resized_height // self.patch_size, resized_width // self.patch_size
            seq_len += grid_t * grid_h * grid_w
        return (seq_len, hidden_dim)


@require_torch
@require_vision
class Glm4vImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
    image_processor_tester_class = Glm4vImageProcessingTester

    # batch size is flattened
    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").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape([image_inputs[0]])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            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), 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 = 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").pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape([image_inputs[0]])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            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), 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 = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, torchify=True)

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

            # Test not batched input
            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), expected_output_image_shape)

            # Test batched
            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), expected_output_image_shape)

    def test_call_numpy_4_channels(self):
        for image_processing_class in self.image_processing_classes.values():
            # Test that can process images which have an arbitrary number of channels
            # Initialize image_processing
            image_processor = image_processing_class(**self.image_processor_dict)

            # create random numpy tensors
            self.image_processor_tester.num_channels = 4
            image_inputs = self.image_processor_tester.prepare_image_inputs(equal_resolution=False, numpify=True)

            # Test not batched input
            encoded_images = image_processor(
                image_inputs[0],
                return_tensors="pt",
                input_data_format="channels_last",
                image_mean=(0.0, 0.0, 0.0, 0.0),
                image_std=(1.0, 1.0, 1.0, 1.0),
            ).pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape([image_inputs[0]])
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)

            # Test batched
            encoded_images = image_processor(
                image_inputs,
                return_tensors="pt",
                input_data_format="channels_last",
                image_mean=(0.0, 0.0, 0.0, 0.0),
                image_std=(1.0, 1.0, 1.0, 1.0),
            ).pixel_values
            expected_output_image_shape = self.image_processor_tester.expected_output_image_shape(image_inputs)
            self.assertEqual(tuple(encoded_images.shape), expected_output_image_shape)