# Copyright 2025 The HuggingFace Inc. team. All rights reserved.
#
# 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.image_utils import IMAGENET_STANDARD_MEAN, IMAGENET_STANDARD_STD
from transformers.testing_utils import require_torch, require_torchvision, require_vision
from transformers.utils import is_torchvision_available, is_vision_available

from ...test_video_processing_common import VideoProcessingTestMixin, prepare_video_inputs


if is_vision_available() and is_torchvision_available():
    from transformers import Molmo2VideoProcessor


class Molmo2VideoProcessingTester:
    def __init__(
        self,
        parent,
        batch_size=5,
        num_frames=8,
        num_channels=3,
        min_resolution=32,
        max_resolution=80,
        do_resize=True,
        size=None,
        do_normalize=True,
        image_mean=IMAGENET_STANDARD_MEAN,
        image_std=IMAGENET_STANDARD_STD,
        do_convert_rgb=True,
        patch_size=14,
        pooling_size=[3, 3],
        do_sample_frames=True,
        max_fps=2,
    ):
        size = size if size is not None else {"height": 378, "width": 378}
        self.parent = parent
        self.batch_size = batch_size
        self.num_frames = num_frames
        self.num_channels = num_channels
        self.min_resolution = min_resolution
        self.max_resolution = max_resolution
        self.do_resize = do_resize
        self.size = size
        self.do_normalize = do_normalize
        self.image_mean = image_mean
        self.image_std = image_std
        self.do_convert_rgb = do_convert_rgb
        self.patch_size = patch_size
        self.pooling_size = pooling_size
        self.do_sample_frames = do_sample_frames
        self.max_fps = max_fps

    def prepare_video_processor_dict(self):
        return {
            "do_resize": self.do_resize,
            "size": self.size,
            "do_normalize": self.do_normalize,
            "image_mean": self.image_mean,
            "image_std": self.image_std,
            "do_convert_rgb": self.do_convert_rgb,
            "patch_size": self.patch_size,
            "pooling_size": self.pooling_size,
            "do_sample_frames": False,
            "max_fps": self.max_fps,
        }

    def prepare_video_inputs(self, equal_resolution=False, numpify=False, torchify=False, return_tensors="pil"):
        if numpify:
            return_tensors = "np"
        elif torchify:
            return_tensors = "torch"
        return prepare_video_inputs(
            self.batch_size,
            self.num_frames,
            self.num_channels,
            self.min_resolution,
            self.max_resolution,
            equal_resolution=equal_resolution,
            return_tensors=return_tensors,
        )


@require_torch
@require_vision
@require_torchvision
class Molmo2VideoProcessingTest(VideoProcessingTestMixin, unittest.TestCase):
    fast_video_processing_class = (
        Molmo2VideoProcessor if (is_vision_available() and is_torchvision_available()) else None
    )
    video_processing_class = Molmo2VideoProcessor if (is_vision_available() and is_torchvision_available()) else None

    def setUp(self):
        super().setUp()
        self.video_processor_tester = Molmo2VideoProcessingTester(self)

    @property
    def video_processor_dict(self):
        return self.video_processor_tester.prepare_video_processor_dict()

    def test_video_processor_from_dict_with_kwargs(self):
        video_processor = self.fast_video_processing_class.from_dict(self.video_processor_dict)
        self.assertEqual(video_processor.size, {"height": 378, "width": 378})
        self.assertEqual(video_processor.patch_size, 14)

        video_processor = self.fast_video_processing_class.from_dict(
            self.video_processor_dict, size={"height": 252, "width": 252}, patch_size=18
        )
        self.assertEqual(video_processor.size, {"height": 252, "width": 252})
        self.assertEqual(video_processor.patch_size, 18)

    def test_video_processor_properties(self):
        video_processor = self.video_processing_class(**self.video_processor_dict)
        self.assertTrue(hasattr(video_processor, "do_resize"))
        self.assertTrue(hasattr(video_processor, "size"))
        self.assertTrue(hasattr(video_processor, "do_normalize"))
        self.assertTrue(hasattr(video_processor, "image_mean"))
        self.assertTrue(hasattr(video_processor, "image_std"))
        self.assertTrue(hasattr(video_processor, "do_convert_rgb"))
        self.assertTrue(hasattr(video_processor, "patch_size"))
        self.assertTrue(hasattr(video_processor, "pooling_size"))
        self.assertTrue(hasattr(video_processor, "do_sample_frames"))

    def _assert_patchified_output(self, outputs, expected_num_videos):
        pixel_values = outputs[self.input_name]
        self.assertEqual(pixel_values.ndim, 3)
        pixels_per_patch = self.video_processor_tester.patch_size**2 * self.video_processor_tester.num_channels
        self.assertEqual(pixel_values.shape[-1], pixels_per_patch)
        self.assertEqual(outputs["video_grids"].shape[0], expected_num_videos)
        pool_h, pool_w = self.video_processor_tester.pooling_size
        self.assertEqual(outputs["video_token_pooling"].ndim, 2)
        self.assertEqual(outputs["video_token_pooling"].shape[-1], pool_h * pool_w)

    def test_call_numpy(self):
        for video_processing_class in self.video_processor_list:
            video_processing = video_processing_class(**self.video_processor_dict)
            video_inputs = self.video_processor_tester.prepare_video_inputs(equal_resolution=False, numpify=True)
            for video in video_inputs:
                self.assertIsInstance(video, np.ndarray)

            outputs = video_processing(video_inputs[0], return_tensors="pt")
            self._assert_patchified_output(outputs, 1)

            outputs = video_processing(video_inputs, return_tensors="pt")
            self._assert_patchified_output(outputs, self.video_processor_tester.batch_size)

    # Molmo2 video processor expects channels-last numpy input, not channels-first torch tensors
    def test_call_pytorch(self):
        pass

    def test_call_pil(self):
        for video_processing_class in self.video_processor_list:
            video_processing = video_processing_class(**self.video_processor_dict)
            video_inputs = self.video_processor_tester.prepare_video_inputs(
                equal_resolution=False, return_tensors="pil"
            )

            outputs = video_processing(video_inputs[0], return_tensors="pt", input_data_format="channels_last")
            self._assert_patchified_output(outputs, 1)

            outputs = video_processing(video_inputs, return_tensors="pt", input_data_format="channels_last")
            self._assert_patchified_output(outputs, self.video_processor_tester.batch_size)

    def test_call_sample_frames(self):
        for video_processing_class in self.video_processor_list:
            video_processing = video_processing_class(**self.video_processor_dict)
            video_inputs = self.video_processor_tester.prepare_video_inputs(equal_resolution=False, numpify=True)

            outputs = video_processing(video_inputs[0], return_tensors="pt", num_frames=3)
            self._assert_patchified_output(outputs, 1)

            outputs = video_processing(video_inputs, return_tensors="pt", num_frames=3)
            self._assert_patchified_output(outputs, self.video_processor_tester.batch_size)

    def test_call_sample_frames_short_batched_videos(self):
        for video_processing_class in self.video_processor_list:
            video_processing = video_processing_class(**{**self.video_processor_dict, "do_sample_frames": True})
            videos = [np.zeros((15, 32, 32, 3), dtype=np.uint8), np.zeros((7, 48, 40, 3), dtype=np.uint8)]

            outputs = video_processing(videos, return_tensors="pt", num_frames=384)

            self._assert_patchified_output(outputs, 2)
            self.assertEqual(outputs["video_grids"][:, 0].tolist(), [15, 7])

    def test_nested_input(self):
        for video_processing_class in self.video_processor_list:
            video_processing = video_processing_class(**self.video_processor_dict)
            video_inputs = self.video_processor_tester.prepare_video_inputs(
                equal_resolution=False, return_tensors="np"
            )
            video_inputs = [list(video) for video in video_inputs]

            outputs = video_processing(video_inputs[0], return_tensors="pt")
            self._assert_patchified_output(outputs, 1)

            outputs = video_processing(video_inputs, return_tensors="pt")
            self._assert_patchified_output(outputs, self.video_processor_tester.batch_size)

    @unittest.skip(
        reason="Molmo2VideoProcessor always converts to RGB before processing; 4-channel videos are not supported."
    )
    def test_call_numpy_4_channels(self):
        pass

    @unittest.skip(
        reason="Molmo2 resizes without antialiasing to match the reference processor; under inductor the bilinear "
        "kernel rounds a few pixels to the neighboring uint8 value, and that 1/255 difference exceeds the "
        "test's 1e-4 tolerance."
    )
    def test_can_compile_fast_video_processor(self):
        pass