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# Copyright 2025 Deepseek AI and The HuggingFace 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.

from typing import Optional, Union

import numpy as np

from ...image_processing_utils import BaseImageProcessor
from ...image_processing_utils_fast import BatchFeature, get_size_dict
from ...image_transforms import convert_to_rgb, resize, to_channel_dimension_format
from ...image_utils import (
    OPENAI_CLIP_MEAN,
    OPENAI_CLIP_STD,
    ChannelDimension,
    ImageInput,
    PILImageResampling,
    get_image_size,
    infer_channel_dimension_format,
    is_scaled_image,
    make_flat_list_of_images,
    to_numpy_array,
    valid_images,
    validate_preprocess_arguments,
)
from ...processing_utils import ImagesKwargs
from ...utils import TensorType, filter_out_non_signature_kwargs, is_vision_available, logging


if is_vision_available():
    import PIL


logger = logging.get_logger(__name__)


class DeepseekVLHybridImageProcessorKwargs(ImagesKwargs, total=False):
    r"""
    min_size (`int`, *optional*, defaults to 14):
        The minimum allowed size for the resized image. Ensures that neither the height nor width
        falls below this value after resizing.
     high_res_size (`dict`, *optional*, defaults to `{"height": 1024, "width": 1024}`):
        Size of the high resolution output image after resizing. Can be overridden by the `high_res_size` parameter in the `preprocess`
        method.
    high_res_resample (`PILImageResampling`, *optional*, defaults to `Resampling.BICUBIC`):
        Resampling filter to use if resizing the image. Only has an effect if `do_resize` is set to `True`. Can be
        overridden by the `high_res_resample` parameter in the `preprocess` method.
    high_res_image_mean (`float` or `list[float]`, *optional*, defaults to `OPENAI_CLIP_MEAN`):
        Mean to use if normalizing the high resolution image. This is a float or list of floats the length of the number of
        channels in the image. Can be overridden by the `high_res_image_mean` parameter in the `preprocess` method.
    high_res_image_std (`float` or `list[float]`, *optional*, defaults to `OPENAI_CLIP_STD`):
        Standard deviation to use if normalizing the high resolution image. This is a float or list of floats the length of the
        number of channels in the image. Can be overridden by the `high_res_image_std` parameter in the `preprocess` method.
    """

    min_size: int
    high_res_size: dict
    high_res_resample: Union["PILImageResampling", int]
    high_res_image_mean: Union[float, list[float], tuple[float, ...]]
    high_res_image_std: Union[float, list[float], tuple[float, ...]]


class DeepseekVLHybridImageProcessor(BaseImageProcessor):
    r"""
    Constructs a DEEPSEEK_VL_HYBRID image processor.

    Args:
        do_resize (`bool`, *optional*, defaults to `True`):
            Whether to resize the image's (height, width) dimensions to the specified `size`. Can be overridden by the
            `do_resize` parameter in the `preprocess` method.
        size (`dict`, *optional*, defaults to `{"height": 384, "width": 384}`):
            Size of the output image after resizing. Can be overridden by the `size` parameter in the `preprocess`
            method.
        high_res_size (`dict`, *optional*, defaults to `{"height": 1024, "width": 1024}`):
            Size of the high resolution output image after resizing. Can be overridden by the `high_res_size` parameter in the `preprocess`
            method.
        min_size (`int`, *optional*, defaults to 14):
            The minimum allowed size for the resized image. Ensures that neither the height nor width
            falls below this value after resizing.
        resample (`PILImageResampling`, *optional*, defaults to `Resampling.BICUBIC`):
            Resampling filter to use if resizing the image. Only has an effect if `do_resize` is set to `True`. Can be
            overridden by the `resample` parameter in the `preprocess` method.
        high_res_resample (`PILImageResampling`, *optional*, defaults to `Resampling.BICUBIC`):
            Resampling filter to use if resizing the image. Only has an effect if `do_resize` is set to `True`. Can be
            overridden by the `high_res_resample` parameter in the `preprocess` method.
        do_rescale (`bool`, *optional*, defaults to `True`):
            Whether to rescale the image by the specified scale `rescale_factor`. Can be overridden by the
            `do_rescale` parameter in the `preprocess` method.
        rescale_factor (`int` or `float`, *optional*, defaults to `1/255`):
            Scale factor to use if rescaling the image. Only has an effect if `do_rescale` is set to `True`. Can be
            overridden by the `rescale_factor` parameter in the `preprocess` method.
        do_normalize (`bool`, *optional*, defaults to `True`):
            Whether to normalize the image. Can be overridden by the `do_normalize` parameter in the `preprocess`
            method. Can be overridden by the `do_normalize` parameter in the `preprocess` method.
        image_mean (`float` or `list[float]`, *optional*, defaults to `IMAGENET_STANDARD_MEAN`):
            Mean to use if normalizing the image. This is a float or list of floats the length of the number of
            channels in the image. Can be overridden by the `image_mean` parameter in the `preprocess` method. Can be
            overridden by the `image_mean` parameter in the `preprocess` method.
        image_std (`float` or `list[float]`, *optional*, defaults to `IMAGENET_STANDARD_STD`):
            Standard deviation to use if normalizing the image. This is a float or list of floats the length of the
            number of channels in the image. Can be overridden by the `image_std` parameter in the `preprocess` method.
            Can be overridden by the `image_std` parameter in the `preprocess` method.
        high_res_image_mean (`float` or `list[float]`, *optional*, defaults to `OPENAI_CLIP_MEAN`):
            Mean to use if normalizing the high resolution image. This is a float or list of floats the length of the number of
            channels in the image. Can be overridden by the `high_res_image_mean` parameter in the `preprocess` method.
        high_res_image_std (`float` or `list[float]`, *optional*, defaults to `OPENAI_CLIP_STD`):
            Standard deviation to use if normalizing the high resolution image. This is a float or list of floats the length of the
            number of channels in the image. Can be overridden by the `high_res_image_std` parameter in the `preprocess` method.
        do_convert_rgb (`bool`, *optional*, defaults to `True`):
            Whether to convert the image to RGB.
        do_pad (`bool`, *optional*, defaults to `True`):
            Whether to pad the image to square or not.
    """

    model_input_names = ["pixel_values", "high_res_pixel_values"]
    valid_kwargs = DeepseekVLHybridImageProcessorKwargs

    def __init__(
        self,
        do_resize: bool = True,
        size: Optional[dict[str, int]] = None,
        high_res_size: Optional[dict[str, int]] = None,
        min_size: int = 14,
        resample: PILImageResampling = PILImageResampling.BICUBIC,
        high_res_resample: PILImageResampling = PILImageResampling.BICUBIC,
        do_rescale: bool = True,
        rescale_factor: Union[int, float] = 1 / 255,
        do_normalize: bool = True,
        image_mean: Optional[Union[float, list[float]]] = None,
        image_std: Optional[Union[float, list[float]]] = None,
        high_res_image_mean: Optional[Union[float, list[float]]] = None,
        high_res_image_std: Optional[Union[float, list[float]]] = None,
        do_convert_rgb: Optional[bool] = None,
        do_pad: bool = True,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        high_res_size = high_res_size if high_res_size is not None else {"height": 1024, "width": 1024}
        high_res_size = get_size_dict(high_res_size, default_to_square=True)

        self.high_res_size = high_res_size
        self.high_res_image_mean = high_res_image_mean if high_res_image_mean is not None else OPENAI_CLIP_MEAN
        self.high_res_image_std = high_res_image_std if high_res_image_std is not None else OPENAI_CLIP_STD

        self.resample = resample
        self.high_res_resample = high_res_resample
        size = size if size is not None else {"height": 384, "width": 384}
        size = get_size_dict(size, default_to_square=True)

        self.do_resize = do_resize
        self.size = size
        self.resample = resample
        self.do_rescale = do_rescale
        self.rescale_factor = rescale_factor
        self.do_normalize = do_normalize
        self.image_mean = image_mean if image_mean is not None else OPENAI_CLIP_MEAN
        self.image_std = image_std if image_std is not None else OPENAI_CLIP_STD
        self.do_convert_rgb = do_convert_rgb

        self.do_pad = do_pad
        self.min_size = min_size
        if image_mean is None:
            self.background_color = (127, 127, 127)
        else:
            self.background_color = tuple(int(x * 255) for x in image_mean)

        if high_res_image_mean is None:
            self.high_res_background_color = (127, 127, 127)
        else:
            self.high_res_background_color = tuple(int(x * 255) for x in high_res_image_mean)

    def resize(
        self,
        image: np.ndarray,
        size: Union[dict[str, int], int],
        resample: PILImageResampling = PILImageResampling.BICUBIC,
        data_format: Optional[Union[str, ChannelDimension]] = None,
        input_data_format: Optional[Union[str, ChannelDimension]] = None,
        **kwargs,
    ) -> np.ndarray:
        """
        Resize an image to dynamically calculated size.

        Args:
            image (`np.ndarray`):
                Image to resize.
            size (`dict[str, int]` or `int`):
                The size to resize the image to. If a dictionary, it should have the keys `"height"` and `"width"`.
            resample (`PILImageResampling`, *optional*, defaults to `PILImageResampling.BICUBIC`):
                `PILImageResampling` filter to use when resizing the image e.g. `PILImageResampling.BICUBIC`.
            data_format (`ChannelDimension` or `str`, *optional*):
                The channel dimension format for the output image. If unset, the channel dimension format of the input
                image is used. Can be one of:
                - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.
                - `None`: will be inferred from input
            input_data_format (`ChannelDimension` or `str`, *optional*):
                The channel dimension format for the input image. If unset, the channel dimension format is inferred
                from the input image. Can be one of:
                - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.
                - `"none"` or `ChannelDimension.NONE`: image in (height, width) format.

        Returns:
            `np.ndarray`: The resized image.
        """
        if input_data_format is None:
            input_data_format = infer_channel_dimension_format(image)

        height, width = get_image_size(image, input_data_format)
        max_size = max(height, width)

        size = get_size_dict(size, default_to_square=True)
        if size["height"] != size["width"]:
            raise ValueError(
                f"Output height and width must be the same. Got height={size['height']} and width={size['width']}"
            )
        size = size["height"]

        delta = size / max_size
        # Largest side becomes `size` and the other side is scaled according to the aspect ratio.
        output_size_nonpadded = [
            max(int(height * delta), self.min_size),
            max(int(width * delta), self.min_size),
        ]

        image = resize(
            image,
            size=output_size_nonpadded,
            resample=resample,
            data_format=data_format,
            input_data_format=input_data_format,
            **kwargs,
        )
        return image

    @filter_out_non_signature_kwargs()
    def preprocess(
        self,
        images: ImageInput,
        do_resize: Optional[bool] = None,
        size: Optional[dict[str, int]] = None,
        high_res_size: Optional[dict[str, int]] = None,
        resample: Optional[PILImageResampling] = None,
        high_res_resample: Optional[PILImageResampling] = None,
        do_rescale: Optional[bool] = None,
        rescale_factor: Optional[float] = None,
        do_normalize: Optional[bool] = None,
        image_mean: Optional[Union[float, list[float]]] = None,
        image_std: Optional[Union[float, list[float]]] = None,
        high_res_image_mean: Optional[Union[float, list[float]]] = None,
        high_res_image_std: Optional[Union[float, list[float]]] = None,
        return_tensors: Optional[Union[str, TensorType]] = None,
        data_format: Union[str, ChannelDimension] = ChannelDimension.FIRST,
        input_data_format: Optional[Union[str, ChannelDimension]] = None,
        do_convert_rgb: Optional[bool] = None,
        do_pad: Optional[bool] = None,
        background_color: Optional[tuple[int, int, int]] = None,
    ) -> PIL.Image.Image:
        """
        Preprocess an image or batch of images.

        Args:
            images (`ImageInput`):
                Image to preprocess. Expects a single or batch of images with pixel values ranging from 0 to 255. If
                passing in images with pixel values between 0 and 1, set `do_rescale=False`.
            do_resize (`bool`, *optional*, defaults to `self.do_resize`):
                Whether to resize the image.
            size (`Dict[str, int]`, *optional*, defaults to `self.size`):
                Dictionary in the format `{"height": h, "width": w}` specifying the size of the output image after
                resizing.
            high_res_size (`Dict[str, int]`, *optional*, defaults to `self.high_res_size`):
                Dictionary in the format `{"height": h, "width": w}` specifying the size of the high resolution output image after
                resizing.
            resample (`PILImageResampling` filter, *optional*, defaults to `self.resample`):
                `PILImageResampling` filter to use if resizing the image e.g. `PILImageResampling.BILINEAR`. Only has
                an effect if `do_resize` is set to `True`.
            high_res_resample (`PILImageResampling` filter, *optional*, defaults to `self.resample`):
                `PILImageResampling` filter to use if resizing the image e.g. `PILImageResampling.BICUBIC`. Only has
                an effect if `do_resize` is set to `True`.
            do_rescale (`bool`, *optional*, defaults to `self.do_rescale`):
                Whether to rescale the image values between [0 - 1].
            rescale_factor (`float`, *optional*, defaults to `self.rescale_factor`):
                Rescale factor to rescale the image by if `do_rescale` is set to `True`.
            do_normalize (`bool`, *optional*, defaults to `self.do_normalize`):
                Whether to normalize the image.
            image_mean (`float` or `List[float]`, *optional*, defaults to `self.image_mean`):
                Image mean to use if `do_normalize` is set to `True`.
            image_std (`float` or `List[float]`, *optional*, defaults to `self.image_std`):
                Image standard deviation to use if `do_normalize` is set to `True`.
            high_res_image_mean (`float` or `List[float]`, *optional*, defaults to `self.high_res_image_mean`):
                Image mean to use if `do_normalize` is set to `True`.
            high_res_image_std (`float` or `List[float]`, *optional*, defaults to `self.high_res_image_std`):
                Image standard deviation to use if `do_normalize` is set to `True`.
            return_tensors (`str` or `TensorType`, *optional*):
                The type of tensors to return. Can be one of:
                - Unset: Return a list of `np.ndarray`.
                - `TensorType.PYTORCH` or `'pt'`: Return a batch of type `torch.Tensor`.
                - `TensorType.NUMPY` or `'np'`: Return a batch of type `np.ndarray`.
            data_format (`ChannelDimension` or `str`, *optional*, defaults to `ChannelDimension.FIRST`):
                The channel dimension format for the output image. Can be one of:
                - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.
                - Unset: Use the channel dimension format of the input image.
            input_data_format (`ChannelDimension` or `str`, *optional*):
                The channel dimension format for the input image. If unset, the channel dimension format is inferred
                from the input image. Can be one of:
                - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.
                - `"none"` or `ChannelDimension.NONE`: image in (height, width) format.
            do_convert_rgb (`bool`, *optional*, defaults to `self.do_convert_rgb`):
                Whether to convert the image to RGB.
            do_pad (`bool`, *optional*, defaults to `self.do_pad`):
                Whether to pad the image to square or not.
            background_color (`tuple[int, int, int]`):
                The background color to use for the padding.
        """
        do_resize = do_resize if do_resize is not None else self.do_resize
        do_rescale = do_rescale if do_rescale is not None else self.do_rescale
        do_normalize = do_normalize if do_normalize is not None else self.do_normalize
        resample = resample if resample is not None else self.resample
        high_res_resample = high_res_resample if high_res_resample is not None else self.high_res_resample
        rescale_factor = rescale_factor if rescale_factor is not None else self.rescale_factor
        image_mean = image_mean if image_mean is not None else self.image_mean
        image_std = image_std if image_std is not None else self.image_std
        high_res_image_mean = high_res_image_mean if high_res_image_mean is not None else self.high_res_image_mean
        high_res_image_std = high_res_image_std if high_res_image_std is not None else self.high_res_image_std
        do_convert_rgb = do_convert_rgb if do_convert_rgb is not None else self.do_convert_rgb
        do_pad = do_pad if do_pad is not None else self.do_pad
        background_color = background_color if background_color is not None else self.background_color

        size = size if size is not None else self.size
        size_dict = get_size_dict(size)
        high_res_size = high_res_size if high_res_size is not None else self.high_res_size
        high_res_size_dict = get_size_dict(high_res_size)

        images = self.fetch_images(images)
        images = make_flat_list_of_images(images)

        if not valid_images(images):
            raise ValueError("Invalid image type. Must be of type PIL.Image.Image, numpy.ndarray, or torch.Tensor")
        validate_preprocess_arguments(
            do_rescale=do_rescale,
            rescale_factor=rescale_factor,
            do_normalize=do_normalize,
            image_mean=image_mean,
            image_std=image_std,
            do_resize=do_resize,
            size=size,
            resample=resample,
        )

        if do_convert_rgb:
            images = [convert_to_rgb(image) for image in images]

        # All transformations expect numpy arrays.
        images = [to_numpy_array(image) for image in images]

        if do_rescale and is_scaled_image(images[0]):
            logger.warning_once(
                "It looks like you are trying to rescale already rescaled images. If the input"
                " images have pixel values between 0 and 1, set `do_rescale=False` to avoid rescaling them again."
            )

        if input_data_format is None:
            # We assume that all images have the same channel dimension format.
            input_data_format = infer_channel_dimension_format(images[0])

        all_images = []
        all_high_res_images = []
        for image in images:
            # high_res_image: resize (high) -> rescale -> normalize (high)
            # low_res_image:  resize (high) -> rescale -> resize (low) -> normalize (low)
            high_res_image = image
            if do_resize:
                high_res_image = self.resize(
                    image=high_res_image,
                    size=high_res_size_dict,
                    resample=high_res_resample,
                    input_data_format=input_data_format,
                )
                if do_pad:
                    # Expand and pad the images to obtain a square image of dimensions `size x size`
                    high_res_image = self.pad_to_square(
                        image=high_res_image,
                        background_color=background_color,
                        input_data_format=input_data_format,
                    )
                image = self.resize(
                    image=high_res_image,
                    size=size_dict,
                    resample=resample,
                    input_data_format=input_data_format,
                )
                if do_pad:
                    image = self.pad_to_square(
                        image=image,
                        background_color=background_color,
                        input_data_format=input_data_format,
                    )

            if do_rescale:
                image = self.rescale(image=image, scale=rescale_factor, input_data_format=input_data_format)
                high_res_image = self.rescale(
                    image=high_res_image, scale=rescale_factor, input_data_format=input_data_format
                )

            if do_normalize:
                image = self.normalize(
                    image=image, mean=image_mean, std=image_std, input_data_format=input_data_format
                )
                high_res_image = self.normalize(
                    image=high_res_image,
                    mean=high_res_image_mean,
                    std=high_res_image_std,
                    input_data_format=input_data_format,
                )

            image = to_channel_dimension_format(image, data_format, input_channel_dim=input_data_format)
            high_res_image = to_channel_dimension_format(
                high_res_image, data_format, input_channel_dim=input_data_format
            )

            all_images.append(image)
            all_high_res_images.append(high_res_image)

        data = {"pixel_values": all_images, "high_res_pixel_values": all_high_res_images}
        return BatchFeature(data=data, tensor_type=return_tensors)

    def pad_to_square(
        self,
        image: np.ndarray,
        background_color: Union[int, tuple[int, int, int]] = 0,
        data_format: Optional[Union[str, ChannelDimension]] = None,
        input_data_format: Optional[Union[str, ChannelDimension]] = None,
    ) -> np.ndarray:
        """
        Pads an image to a square based on the longest edge.

        Args:
            image (`np.ndarray`):
                The image to pad.
            background_color (`int` or `tuple[int, int, int]`, *optional*, defaults to 0):
                The color to use for the padding. Can be an integer for single channel or a
                tuple of integers representing for multi-channel images. If passed as integer
                in multi-channel mode, it will default to `0` in subsequent channels.
            data_format (`str` or `ChannelDimension`, *optional*):
                The channel dimension format for the output image. Can be one of:
                    - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                    - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.
                If unset, will use same as the input image.
            input_data_format (`str` or `ChannelDimension`, *optional*):
                The channel dimension format for the input image. Can be one of:
                    - `"channels_first"` or `ChannelDimension.FIRST`: image in (num_channels, height, width) format.
                    - `"channels_last"` or `ChannelDimension.LAST`: image in (height, width, num_channels) format.

        Returns:
            `np.ndarray`: The padded image.
        """
        height, width = get_image_size(image, input_data_format)
        num_channels = image.shape[0] if input_data_format == ChannelDimension.FIRST else image.shape[-1]

        if height == width:
            image = (
                to_channel_dimension_format(image, data_format, input_data_format)
                if data_format is not None
                else image
            )
            return image

        max_dim = max(height, width)

        # Ensure background_color is the correct shape
        if isinstance(background_color, int):
            background_color = [background_color]
        elif len(background_color) != num_channels:
            raise ValueError(
                f"background_color must have no more than {num_channels} elements to match the number of channels"
            )

        if input_data_format == ChannelDimension.FIRST:
            result = np.zeros((num_channels, max_dim, max_dim), dtype=image.dtype)
            for i, color in enumerate(background_color):
                result[i, :, :] = color
            if width > height:
                start = (max_dim - height) // 2
                result[:, start : start + height, :] = image
            else:
                start = (max_dim - width) // 2
                result[:, :, start : start + width] = image
        else:
            result = np.zeros((max_dim, max_dim, num_channels), dtype=image.dtype)
            for i, color in enumerate(background_color):
                result[:, :, i] = color
            if width > height:
                start = (max_dim - height) // 2
                result[start : start + height, :, :] = image
            else:
                start = (max_dim - width) // 2
                result[:, start : start + width, :] = image

        return result


__all__ = ["DeepseekVLHybridImageProcessor"]
