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# coding=utf-8
# Copyright 2024 The Rhymes-AI Teams Authors and 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.
from typing import Optional, Union

import numpy as np

from ...image_processing_utils import BatchFeature
from ...image_utils import ImageInput
from ...processing_utils import MultiModalData, ProcessingKwargs, ProcessorMixin, Unpack
from ...tokenization_utils import PreTokenizedInput, TextInput
from ...utils import TensorType
from ..auto import AutoTokenizer


class AriaProcessorKwargs(ProcessingKwargs, total=False):
    _defaults = {
        "text_kwargs": {
            "padding": False,
            "return_mm_token_type_ids": False,
        },
        "images_kwargs": {
            "max_image_size": 980,
            "split_image": False,
        },
        "return_tensors": TensorType.PYTORCH,
    }


class AriaProcessor(ProcessorMixin):
    """
    AriaProcessor is a processor for the Aria model which wraps the Aria image preprocessor and the LLama slow tokenizer.

    Args:
        image_processor (`AriaImageProcessor`, *optional*):
            The AriaImageProcessor to use for image preprocessing.
        tokenizer (`PreTrainedTokenizerBase`, *optional*):
            An instance of [`PreTrainedTokenizerBase`]. This should correspond with the model's text model. The tokenizer is a required input.
        chat_template (`str`, *optional*):
            A Jinja template which will be used to convert lists of messages in a chat into a tokenizable string.
        size_conversion (`Dict`, *optional*):
            A dictionary indicating size conversions for images.
    """

    attributes = ["image_processor", "tokenizer"]
    image_processor_class = "AriaImageProcessor"
    tokenizer_class = "AutoTokenizer"

    def __init__(
        self,
        image_processor=None,
        tokenizer: Union[AutoTokenizer, str] = None,
        chat_template: Optional[str] = None,
        size_conversion: Optional[dict[Union[float, int], int]] = None,
    ):
        if size_conversion is None:
            size_conversion = {490: 128, 980: 256}
        self.size_conversion = {int(k): v for k, v in size_conversion.items()}

        self.image_token = tokenizer.image_token
        self.image_token_id = tokenizer.image_token_id
        if tokenizer is not None and tokenizer.pad_token is None:
            tokenizer.pad_token = tokenizer.unk_token

        super().__init__(image_processor, tokenizer, chat_template=chat_template)

    def __call__(
        self,
        text: Union[TextInput, PreTokenizedInput, list[TextInput], list[PreTokenizedInput]],
        images: Optional[ImageInput] = None,
        audio=None,
        videos=None,
        **kwargs: Unpack[AriaProcessorKwargs],
    ) -> BatchFeature:
        """
        Main method to prepare for the model one or several sequences(s) and image(s).

        Args:
            text (`TextInput`, `PreTokenizedInput`, `list[TextInput]`, `list[PreTokenizedInput]`):
                The sequence or batch of sequences to be encoded. Each sequence can be a string or a list of strings
                (pretokenized string). If the sequences are provided as list of strings (pretokenized), you must set
                `is_split_into_words=True` (to lift the ambiguity with a batch of sequences).
            images (`ImageInput`):
                The image or batch of images to be prepared. Each image can be a PIL image, NumPy array or PyTorch
                tensor. Both channels-first and channels-last formats are supported.


        Returns:
            [`BatchFeature`]: A [`BatchFeature`] with the following fields:
            - **input_ids** -- List of token ids to be fed to a model. Returned when `text` is not `None`.
            - **attention_mask** -- List of indices specifying which tokens should be attended to by the model (when
            `return_attention_mask=True` or if *"attention_mask"* is in `self.model_input_names` and if `text` is not
            `None`).
            - **pixel_values** -- Pixel values to be fed to a model. Returned when `images` is not `None`.
            - **pixel_mask** -- Pixel mask to be fed to a model. Returned when `images` is not `None`.
        """
        output_kwargs = self._merge_kwargs(
            AriaProcessorKwargs,
            tokenizer_init_kwargs=self.tokenizer.init_kwargs,
            **kwargs,
        )

        if isinstance(text, str):
            text = [text]
        elif not isinstance(text, list) and not isinstance(text[0], str):
            raise TypeError("Invalid input text. Please provide a string, or a list of strings")

        if images is not None:
            image_inputs = self.image_processor(images, **output_kwargs["images_kwargs"])
            # expand the image_token according to the num_crops and tokens per image
            tokens_per_image = self.size_conversion[image_inputs.pixel_values.shape[2]]
            prompt_strings = []
            num_crops = image_inputs.pop("num_crops") * tokens_per_image
            for sample in text:
                sample = sample.replace(self.tokenizer.image_token, self.tokenizer.image_token * num_crops)
                prompt_strings.append(sample)

        else:
            image_inputs = {}
            prompt_strings = text

        return_tensors = output_kwargs["text_kwargs"].pop("return_tensors", None)
        return_mm_token_type_ids = output_kwargs["text_kwargs"].pop("return_mm_token_type_ids", False)
        text_inputs = self.tokenizer(prompt_strings, **output_kwargs["text_kwargs"], return_tensors=None)
        self._check_special_mm_tokens(prompt_strings, text_inputs, modalities=["image"])

        if return_mm_token_type_ids:
            array_ids = np.array(text_inputs["input_ids"])
            mm_token_type_ids = np.zeros_like(text_inputs["input_ids"])
            mm_token_type_ids[array_ids == self.image_token_id] = 1
            text_inputs["mm_token_type_ids"] = mm_token_type_ids.tolist()

        return BatchFeature(data={**text_inputs, **image_inputs}, tensor_type=return_tensors)

    def _get_num_multimodal_tokens(self, image_sizes=None, **kwargs):
        """
        Computes the number of placeholder tokens needed for multimodal inputs with the given sizes.
        Args:
            image_sizes (`list[list[int]]`, *optional*):
                The input sizes formatted as (height, width) per each image.
        Returns:
            `MultiModalData`: A `MultiModalData` object holding number of tokens per each of the provided
            input modalities, along with other useful data.
        """

        vision_data = {}
        if image_sizes is not None:
            images_kwargs = AriaProcessorKwargs._defaults.get("images_kwargs", {})
            images_kwargs.update(kwargs)

            max_size = images_kwargs.get("max_image_size", None) or self.image_processor.max_image_size
            num_image_patches = [
                self.image_processor.get_number_of_image_patches(*image_size, images_kwargs)
                for image_size in image_sizes
            ]
            num_image_tokens = [self.size_conversion[max_size] * num_patches for num_patches in num_image_patches]
            vision_data.update({"num_image_tokens": num_image_tokens, "num_image_patches": num_image_patches})

        return MultiModalData(**vision_data)

    @property
    def model_input_names(self):
        tokenizer_input_names = self.tokenizer.model_input_names
        image_processor_input_names = self.image_processor.model_input_names

        # Remove `num_crops`, it is popped and used only when processing. Make a copy of list when removing
        # otherwise `self.image_processor.model_input_names` is also modified
        image_processor_input_names = [name for name in image_processor_input_names if name != "num_crops"]
        return list(dict.fromkeys(tokenizer_input_names + image_processor_input_names))


__all__ = ["AriaProcessor"]
