"""DynaFLIP processor — combines image processor and tokenizer."""

from typing import List, Optional, Union

from transformers import AutoTokenizer
from transformers.processing_utils import ProcessorMixin
from transformers.image_processing_utils import BatchFeature


class DynaFLIPProcessor(ProcessorMixin):
    """Processor for DynaFLIP models.

    Combines DynaFLIPImageProcessor (for images) and T5Tokenizer (for text)
    into a single processor, similar to SiglipProcessor.

    Example:
        >>> processor = DynaFLIPProcessor.from_pretrained("username/dynaflip-base")
        >>> inputs = processor(images=img, text="pick up the cup", return_tensors="pt")
        >>> inputs.keys()  # dict_keys(['pixel_values', 'input_ids', 'attention_mask'])
    """

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

    def __init__(self, image_processor=None, tokenizer=None, **kwargs):
        super().__init__(image_processor=image_processor, tokenizer=tokenizer)

    def __call__(
        self,
        images=None,
        text: Optional[Union[str, List[str]]] = None,
        padding: Union[bool, str] = True,
        truncation: bool = True,
        max_length: int = 77,
        return_tensors: Optional[str] = None,
        **kwargs,
    ) -> BatchFeature:
        """Process images and/or text for DynaFLIP.

        Args:
            images: Single image or list of images.
            text: Single string or list of strings.
            padding: Tokenizer padding strategy.
            truncation: Whether to truncate text.
            max_length: Maximum text length.
            return_tensors: "pt" for PyTorch, "np" for numpy.
        Returns:
            BatchFeature with pixel_values and/or input_ids + attention_mask.
        """
        if images is None and text is None:
            raise ValueError("You must provide at least one of `images` or `text`.")

        encoding = BatchFeature()

        if images is not None:
            image_features = self.image_processor(
                images, return_tensors=return_tensors, **kwargs
            )
            encoding.update(image_features)

        if text is not None:
            if isinstance(text, str):
                text = [text]
            text_features = self.tokenizer(
                text,
                return_tensors=return_tensors,
                padding=padding,
                truncation=truncation,
                max_length=max_length,
            )
            encoding.update(text_features)

        return encoding

    def batch_decode(self, *args, **kwargs):
        return self.tokenizer.batch_decode(*args, **kwargs)

    def decode(self, *args, **kwargs):
        return self.tokenizer.decode(*args, **kwargs)

    @property
    def model_input_names(self):
        image_names = self.image_processor.model_input_names
        tokenizer_names = self.tokenizer.model_input_names
        return list(dict.fromkeys(image_names + tokenizer_names))