# Copyright 2023 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 Pix2Struct.
"""

from ...feature_extraction_utils import BatchFeature
from ...processing_utils import ProcessingKwargs, ProcessorMixin, Unpack
from ...tokenization_utils_base import BatchEncoding, PreTokenizedInput, TextInput
from ...utils import auto_docstring, logging


class Pix2StructProcessorKwargs(ProcessingKwargs, total=False):
    _defaults = {
        "text_kwargs": {
            "add_special_tokens": True,
            "padding": False,
            "stride": 0,
            "return_overflowing_tokens": False,
            "return_special_tokens_mask": False,
            "return_offsets_mapping": False,
            "return_token_type_ids": False,
            "return_length": False,
            "verbose": True,
        },
        "images_kwargs": {
            "max_patches": 2048,
        },
    }


logger = logging.get_logger(__name__)


@auto_docstring
class Pix2StructProcessor(ProcessorMixin):
    def __init__(self, image_processor, tokenizer):
        tokenizer.return_token_type_ids = False
        super().__init__(image_processor, tokenizer)

    @auto_docstring
    def __call__(
        self,
        images=None,
        text: TextInput | PreTokenizedInput | list[TextInput] | list[PreTokenizedInput] = None,
        **kwargs: Unpack[Pix2StructProcessorKwargs],
    ) -> BatchEncoding | BatchFeature:
        if images is None and text is None:
            raise ValueError("You have to specify either images or text.")

        output_kwargs = self._merge_kwargs(
            Pix2StructProcessorKwargs,
            tokenizer_init_kwargs=self.tokenizer.init_kwargs,
            **kwargs,
        )
        add_special_tokens = output_kwargs["text_kwargs"].pop("add_special_tokens", None)
        # Get only text
        if images is None and not self.image_processor.is_vqa:
            output_kwargs["text_kwargs"]["add_special_tokens"] = (
                add_special_tokens if add_special_tokens is not None else True
            )
            text_encoding = self.tokenizer(text=text, **output_kwargs["text_kwargs"])
            return text_encoding

        if not self.image_processor.is_vqa:
            # add pixel_values
            encoding_image_processor = self.image_processor(images, **output_kwargs["images_kwargs"])
        else:
            # add pixel_values and bbox
            output_kwargs["images_kwargs"].setdefault("header_text", text)
            encoding_image_processor = self.image_processor(images, **output_kwargs["images_kwargs"])

        if text is not None and not self.image_processor.is_vqa:
            output_kwargs["text_kwargs"]["add_special_tokens"] = (
                add_special_tokens if add_special_tokens is not None else False
            )
            text_encoding = self.tokenizer(text=text, **output_kwargs["text_kwargs"])

            if "attention_mask" in text_encoding:
                text_encoding["decoder_attention_mask"] = text_encoding.pop("attention_mask")
            if "input_ids" in text_encoding:
                text_encoding["decoder_input_ids"] = text_encoding.pop("input_ids")
        else:
            text_encoding = None

        if text_encoding is not None:
            encoding_image_processor.update(text_encoding)

        return encoding_image_processor

    @property
    def model_input_names(self):
        image_processor_input_names = self.image_processor.model_input_names
        decoder_ids = ["decoder_attention_mask", "decoder_input_ids"]
        return image_processor_input_names + decoder_ids


__all__ = ["Pix2StructProcessor"]