# coding=utf-8
# Copyright 2024 The HuggingFace Inc. team.
#
# 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
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""
Processor class for LLaVa-Onevision.
"""

import math
import os
from typing import Iterable, List, Union

import numpy as np

from ...feature_extraction_utils import BatchFeature
from ...image_processing_utils import select_best_resolution
from ...image_utils import ImageInput, VideoInput, get_image_size, to_numpy_array
from ...processing_utils import ProcessingKwargs, ProcessorMixin, Unpack
from ...tokenization_utils_base import PreTokenizedInput, TextInput
from ...utils import logging
from ..auto import AutoImageProcessor


logger = logging.get_logger(__name__)


class LlavaOnevisionProcessorKwargs(ProcessingKwargs, total=False):
    # see processing_utils.ProcessingKwargs documentation for usage.
    _defaults = {
        "text_kwargs": {
            "padding": False,
        },
        "image_kwargs": {},
        "videos_kwargs": {},
    }


class LlavaOnevisionProcessor(ProcessorMixin):
    r"""
    Constructs a LLaVa-Onevision processor which wraps a LLaVa-Onevision video processor, LLaVa-NeXT image processor and a LLaMa tokenizer into a single processor.

    [`LlavaNextProcessor`] offers all the functionalities of [`LlavaOnevisionVideoProcessor`], [`LlavaOnevisionImageProcessor`] and [`LlamaTokenizerFast`]. See the
    [`~LlavaOnevisionVideoProcessor.__call__`], [`~LlavaNextProcessor.__call__`] and [`~LlavaNextProcessor.decode`] for more information.

    Args:
        image_processor ([`LlavaOnevisionImageProcessor`], *optional*):
            The image processor is a required input.
        tokenizer ([`LlamaTokenizerFast`], *optional*):
            The tokenizer is a required input.
        video_processor ([`LlavaOnevisionVideoProcessor`], *optional*):
            The video processor is a required input.
        num_image_tokens (`int`, *optional*):
            Number of image tokens for one imagethat will be returned by vision tower.
        vision_feature_select_strategy (`str`, *optional*):
            The feature selection strategy used to select the vision feature from the vision backbone.
            Shoudl be same as in model's config
        chat_template (`str`, *optional*): A Jinja template which will be used to convert lists of messages
            in a chat into a tokenizable string.
        image_token (`str`, *optional*, defaults to `"<image>"`):
            Special token used to denote image location.
        video_token (`str`, *optional*, defaults to `"<video>"`):
            Special token used to denote video location.
    """

    attributes = ["image_processor", "tokenizer", "video_processor"]
    valid_kwargs = [
        "chat_template",
        "num_image_tokens",
        "vision_feature_select_strategy",
        "image_token",
        "video_token",
    ]
    image_processor_class = "AutoImageProcessor"
    tokenizer_class = "AutoTokenizer"
    video_processor_class = "LlavaOnevisionVideoProcessor"

    def __init__(
        self,
        image_processor=None,
        tokenizer=None,
        video_processor=None,
        num_image_tokens=None,
        vision_feature_select_strategy=None,
        chat_template=None,
        image_token="<image>",
        video_token="<video>",
        **kwargs,
    ):
        self.num_image_tokens = num_image_tokens
        self.vision_feature_select_strategy = vision_feature_select_strategy
        self.image_token = tokenizer.image_token if hasattr(tokenizer, "image_token") else image_token
        self.video_token = tokenizer.video_token if hasattr(tokenizer, "video_token") else video_token
        super().__init__(image_processor, tokenizer, video_processor, chat_template=chat_template)

    def __call__(
        self,
        images: ImageInput = None,
        text: Union[TextInput, PreTokenizedInput, List[TextInput], List[PreTokenizedInput]] = None,
        audio=None,
        videos: VideoInput = None,
        **kwargs: Unpack[LlavaOnevisionProcessorKwargs],
    ) -> BatchFeature:
        """
        Main method to prepare for the model one or several sequences(s) and image(s). This method forwards the `text`
        and `kwargs` arguments to LlamaTokenizerFast's [`~LlamaTokenizerFast.__call__`] if `text` is not `None` to encode
        the text. To prepare the image(s), this method forwards the `images` and `kwrags` arguments to
        LlavaNextImageProcessor's [`~LlavaNextImageProcessor.__call__`] if `images` is not `None`. Please refer to the doctsring
        of the above two methods for more information.

        Args:
            images (`PIL.Image.Image`, `np.ndarray`, `torch.Tensor`, `List[PIL.Image.Image]`, `List[np.ndarray]`, `List[torch.Tensor]`):
                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.
            text (`str`, `List[str]`, `List[List[str]]`):
                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).
            videos (`np.ndarray`, `torch.Tensor`, `List[np.ndarray]`, `List[torch.Tensor]`):
                The image or batch of videos to be prepared. Each video can be a 4D NumPy array or PyTorch

        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_values_videos** -- Pixel values of a video input to be fed to a model. Returned when `videos` is not `None`.
            - **image_sizes** -- Size of each image that will be used to unpad an image. Returned when `images` is not `None`.
        """

        output_kwargs = self._merge_kwargs(
            LlavaOnevisionProcessorKwargs,
            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 ValueError("Invalid input text. Please provide a string, or a list of strings")

        image_inputs = video_inputs = {}

        if images is not None:
            image_inputs = self.image_processor(images, **output_kwargs["images_kwargs"])

            image_sizes = iter(image_inputs["image_sizes"])
            height, width = get_image_size(
                to_numpy_array(image_inputs["pixel_values"][0][0]),
                channel_dim=output_kwargs["images_kwargs"].get("data_format"),
            )
            text = self._expand_image_tokens(text, image_sizes, height, width, self.image_token)

        if videos is not None:
            video_inputs = self.video_processor(videos, **output_kwargs["videos_kwargs"])

            one_video = video_inputs.get("pixel_values_videos")[0]
            if isinstance(video_inputs.get("pixel_values_videos")[0], (list, tuple)):
                one_video = np.array(one_video)
            else:
                one_video = to_numpy_array(one_video)
            height, width = get_image_size(one_video[0], channel_dim=output_kwargs["images_kwargs"].get("data_format"))
            num_frames = one_video.shape[0]  # frame dim is always after batch dim
            patches_height_width = int(math.sqrt(self.num_image_tokens))
            pooled_height_width = math.ceil(patches_height_width / 2)
            num_video_tokens = (num_frames * pooled_height_width * pooled_height_width) + 1  # +1 for newline token
            text = [sample.replace(self.video_token, self.video_token * num_video_tokens) for sample in text]

        text_inputs = self.tokenizer(text, **output_kwargs["text_kwargs"])
        return BatchFeature(data={**text_inputs, **image_inputs, **video_inputs})

    def _expand_image_tokens(
        self,
        text: List[TextInput],
        image_sizes: Iterable[Union[List[int], int]],
        height: int,
        width: int,
        special_token: str,
        num_frames: int = 1,
    ):
        prompt_strings = []
        for sample in text:
            while special_token in sample:
                image_size_list = next(image_sizes)
                original_size = image_size_list[0] if num_frames != 1 else image_size_list
                if not isinstance(original_size, (list, tuple)):
                    # cast to list to avoid numerical precision errors when calculating unpadding
                    original_size = original_size.tolist()
                orig_height, orig_width = original_size
                num_image_tokens = self._get_number_of_features(orig_height, orig_width, height, width)
                if self.vision_feature_select_strategy == "default":
                    num_image_tokens -= 1
                sample = sample.replace(special_token, "<placeholder>" * num_image_tokens * num_frames, 1)
            prompt_strings.append(sample)
        text = [sample.replace("<placeholder>", special_token) for sample in prompt_strings]
        return text

    def _get_number_of_features(self, orig_height: int, orig_width: int, height: int, width: int) -> int:
        image_grid_pinpoints = self.image_processor.image_grid_pinpoints

        height_best_resolution, width_best_resolution = select_best_resolution(
            [orig_height, orig_width], image_grid_pinpoints
        )
        scale_height, scale_width = height_best_resolution // height, width_best_resolution // width

        patches_height = patches_width = int(math.sqrt(self.num_image_tokens))
        unpadded_features, newline_features = self._get_unpadded_features(
            orig_height, orig_width, patches_height, patches_width, scale_height, scale_width
        )

        # The base patch covers the entire image (no CLS for SigLIP)
        base_features = self.num_image_tokens
        num_image_tokens = unpadded_features + newline_features + base_features
        return num_image_tokens

    # Adapted from transformers.models.llava_next.processing_llava_next.LlavaNextProcessor._get_unpadded_features
    def _get_unpadded_features(self, height, width, patches_height, patches_width, scale_height, scale_width):
        """
        Get number of features for a given image with height/width. LLaVA-NeXT is different from LLaVA
        because it divided each image into patches depending on its resolution. Therefore we need to calculate how many
        patches an image is divided into and get the number of features from that.
        """
        current_height = patches_height * scale_height
        current_width = patches_width * scale_width

        original_aspect_ratio = width / height
        current_aspect_ratio = current_width / current_height
        if original_aspect_ratio > current_aspect_ratio:
            new_height = int(round(height * (current_width / width), 7))
            padding = (current_height - new_height) // 2
            current_height -= padding * 2
        else:
            new_width = int(round(width * (current_height / height), 7))
            padding = (current_width - new_width) // 2
            current_width -= padding * 2

        unpadded_features = current_height * current_width
        newline_features = current_height

        ratio = math.sqrt(current_height * current_width / (9 * patches_height**2))
        if ratio > 1.1:
            unpadded_features = int(current_height // ratio) * int(current_width // ratio)
            newline_features = int(current_height // ratio)

        return (unpadded_features, newline_features)

    # Copied from transformers.models.clip.processing_clip.CLIPProcessor.batch_decode with CLIP->Llama
    def batch_decode(self, *args, **kwargs):
        """
        This method forwards all its arguments to LlamaTokenizerFast's [`~PreTrainedTokenizer.batch_decode`]. Please
        refer to the docstring of this method for more information.
        """
        return self.tokenizer.batch_decode(*args, **kwargs)

    # Copied from transformers.models.clip.processing_clip.CLIPProcessor.decode with CLIP->Llama
    def decode(self, *args, **kwargs):
        """
        This method forwards all its arguments to LlamaTokenizerFast's [`~PreTrainedTokenizer.decode`]. Please refer to
        the docstring of this method for more information.
        """
        return self.tokenizer.decode(*args, **kwargs)

    @property
    # Copied from transformers.models.clip.processing_clip.CLIPProcessor.model_input_names
    def model_input_names(self):
        tokenizer_input_names = self.tokenizer.model_input_names
        image_processor_input_names = self.image_processor.model_input_names
        return list(dict.fromkeys(tokenizer_input_names + image_processor_input_names))

    # override to save video-config in a separate config file
    def save_pretrained(self, save_directory, **kwargs):
        if os.path.isfile(save_directory):
            raise ValueError(f"Provided path ({save_directory}) should be a directory, not a file")
        os.makedirs(save_directory, exist_ok=True)
        video_processor_path = os.path.join(save_directory, "video_processor")
        self.video_processor.save_pretrained(video_processor_path)

        video_processor_present = "video_processor" in self.attributes
        if video_processor_present:
            self.attributes.remove("video_processor")

        outputs = super().save_pretrained(save_directory, **kwargs)

        if video_processor_present:
            self.attributes += ["video_processor"]
        return outputs

    # override to load video-config from a separate config file
    @classmethod
    def from_pretrained(cls, pretrained_model_name_or_path, **kwargs):
        processor = super().from_pretrained(pretrained_model_name_or_path, **kwargs)

        # if return_unused_kwargs a tuple is returned where the second element is 'unused_kwargs'
        if isinstance(processor, tuple):
            processor = processor[0]

        try:
            video_processor = AutoImageProcessor.from_pretrained(
                pretrained_model_name_or_path, subfolder="video_processor"
            )
            processor.video_processor = video_processor
        except EnvironmentError:
            # this means users are using prev version of saved processor where we had only one preprocessor_config.json
            # for loading back that should work and load a LlavaOnevisionVideoProcessor class
            logger.info(
                "You are loading `LlavaOnevisionProcessor` but the indicated `path` doesn't contain a folder called "
                "`video_processor`. It is strongly recommended to load and save the processor again so the video processor is saved "
                "in a separate config."
            )

        return processor


__all__ = ["LlavaOnevisionProcessor"]
