# 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
#
#     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.
"""
Processor class for Pixtral.
"""

import numpy as np

from ...processing_utils import (
    MultiModalData,
    ProcessingKwargs,
    ProcessorMixin,
)
from ...utils import auto_docstring, is_vision_available, logging
from ...utils.import_utils import requires


if is_vision_available():
    from .image_processing_pixtral import get_resize_output_image_size


logger = logging.get_logger(__name__)


class PixtralProcessorKwargs(ProcessingKwargs, total=False):
    _defaults = {
        "text_kwargs": {
            "padding": False,
            "return_mm_token_type_ids": False,
        },
        "common_kwargs": {
            "return_tensors": "pt",
        },
    }


@auto_docstring
@requires(backends=("torchvision", "torch"))
class PixtralProcessor(ProcessorMixin):
    valid_processor_kwargs = PixtralProcessorKwargs

    def __init__(
        self,
        image_processor=None,
        tokenizer=None,
        patch_size: int = 16,
        spatial_merge_size: int = 1,
        chat_template=None,
        image_token="[IMG]",  # set the default and let users change if they have peculiar special tokens in rare cases
        image_break_token="[IMG_BREAK]",
        image_end_token="[IMG_END]",
        **kwargs,
    ):
        r"""
        patch_size (`int`, *optional*, defaults to 16):
            Patch size from the vision tower.
        spatial_merge_size (`int`, *optional*, defaults to 1):
            The downsampling factor for the spatial merge operation.
        image_token (`str`, *optional*, defaults to `"[IMG]"`):
            Special token used to denote image location.
        image_break_token (`str`, *optional*, defaults to `"[IMG_BREAK]"`):
            Special token used to denote the end of a line of pixels in an image.
        image_end_token (`str`, *optional*, defaults to `"[IMG_END]"`):
            Special token used to denote the end of an image input.
        """
        super().__init__(image_processor, tokenizer, chat_template=chat_template)

        self.patch_size = patch_size
        self.spatial_merge_size = spatial_merge_size
        self.image_token = image_token
        self.image_token_id = tokenizer.convert_tokens_to_ids(self.image_token)
        self.image_break_token = image_break_token
        self.image_end_token = image_end_token
        self.image_token_id = tokenizer.convert_tokens_to_ids(self.image_token)
        self.image_break_token_id = tokenizer.convert_tokens_to_ids(self.image_break_token)
        self.image_end_token_id = tokenizer.convert_tokens_to_ids(self.image_end_token)

    @property
    def image_token_ids(self) -> list[int]:
        return [self.image_token_id, self.image_break_token_id, self.image_end_token_id]

    def _process_images(self, images, **images_kwargs):
        images_kwargs["patch_size"] = self.patch_size * self.spatial_merge_size
        return super()._process_images(images, **images_kwargs)

    def replace_image_token(self, image_inputs: dict, image_idx: int, **kwargs) -> str:
        patch_size = self.patch_size * self.spatial_merge_size
        height, width = image_inputs["image_sizes"][image_idx]
        num_height_tokens = height // patch_size
        num_width_tokens = width // patch_size
        replace_tokens = [[self.image_token] * num_width_tokens + [self.image_break_token]] * num_height_tokens
        replace_tokens = [item for sublist in replace_tokens for item in sublist]
        replace_tokens[-1] = self.image_end_token
        return "".join(replace_tokens)

    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 = PixtralProcessorKwargs._defaults.get("images_kwargs", {})
            images_kwargs.update(kwargs)

            size = images_kwargs.get("size", None) or self.image_processor.size
            patch_size = self.patch_size * self.spatial_merge_size

            num_image_tokens = []
            for height, width in image_sizes:
                resized_height, resized_width = get_resize_output_image_size(
                    np.zeros((height, width, 3)),
                    size=(size["longest_edge"], size["longest_edge"]),
                    patch_size=(patch_size, patch_size),
                )
                num_height_tokens = resized_height // patch_size
                num_width_tokens = resized_width // patch_size
                num_image_tokens.append((num_width_tokens + 1) * num_height_tokens)

            num_image_patches = [1] * len(image_sizes)
            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
        return tokenizer_input_names + image_processor_input_names + ["image_sizes"]


__all__ = ["PixtralProcessor"]