inference.py

from huggingface_hub import InferenceClient
from PIL import Image
import io
import config


class DiffusionInference:
    def __init__(self, api_key=None):
        """
        Initialize the inference client with the Hugging Face API token.
        """
        self.api_key = api_key or config.HF_TOKEN
        self.client = InferenceClient(
            provider="hf-inference",
            api_key=self.api_key,
        )

    def text_to_image(self, prompt, model_name=None, negative_prompt=None, **kwargs):
        """
        Generate an image from a text prompt.
        
        Args:
            prompt (str): The text prompt to guide image generation
            model_name (str, optional): The model to use for inference
            negative_prompt (str, optional): What not to include in the image
            **kwargs: Additional parameters to pass to the model
            
        Returns:
            PIL.Image: The generated image
        """
        model = model_name or config.DEFAULT_TEXT2IMG_MODEL
        
        # Create parameters dictionary for all keyword arguments
        params = {
            "prompt": prompt,
            "model": model
        }
        
        # Add negative prompt if provided
        if negative_prompt is not None:
            params["negative_prompt"] = negative_prompt
        
        # Add any other parameters
        for k, v in kwargs.items():
            if k not in ["prompt", "model", "negative_prompt"]:
                params[k] = v
        
        try:
            # Call the API with all parameters as kwargs
            image = self.client.text_to_image(**params)
            return image
        except Exception as e:
            print(f"Error generating image: {e}")
            print(f"Model: {model}")
            print(f"Prompt: {prompt}")
            raise

    def image_to_image(self, image, prompt=None, model_name=None, negative_prompt=None, **kwargs):
        """
        Generate a new image from an input image and optional prompt.
        
        Args:
            image (PIL.Image or str): Input image or path to image
            prompt (str, optional): Text prompt to guide the transformation
            model_name (str, optional): The model to use for inference
            negative_prompt (str, optional): What not to include in the image
            **kwargs: Additional parameters to pass to the model
            
        Returns:
            PIL.Image: The generated image
        """
        import tempfile
        import os
        
        model = model_name or config.DEFAULT_IMG2IMG_MODEL
        
        # Create a temporary file for the image if it's a PIL Image
        temp_file = None
        try:
            # Handle different image input types
            if isinstance(image, str):
                # If it's already a file path, use it directly
                image_path = image
            elif isinstance(image, Image.Image):
                # If it's a PIL Image, save it to a temporary file
                temp_dir = tempfile.gettempdir()
                temp_file = os.path.join(temp_dir, "temp_image.png")
                image.save(temp_file, format="PNG")
                image_path = temp_file
            else:
                # If it's something else, try to convert it to a PIL Image first
                try:
                    pil_image = Image.fromarray(image)
                    temp_dir = tempfile.gettempdir()
                    temp_file = os.path.join(temp_dir, "temp_image.png")
                    pil_image.save(temp_file, format="PNG")
                    image_path = temp_file
                except Exception as e:
                    raise ValueError(f"Unsupported image type: {type(image)}. Error: {e}")
            
            # Create a NEW InferenceClient for this call to avoid any potential state issues
            client = InferenceClient(
                provider="hf-inference",
                api_key=self.api_key,
            )
            
            # Create the parameter dict with only the non-None values
            params = {}
            # Only add parameters that are not None
            if model is not None:
                params["model"] = model
            if prompt is not None:
                params["prompt"] = prompt
            if negative_prompt is not None:
                params["negative_prompt"] = negative_prompt
            
            # Add additional kwargs, but filter out any that might create conflicts
            for k, v in kwargs.items():
                if v is not None and k not in ["image", "prompt", "model", "negative_prompt"]:
                    params[k] = v
                    
            # Debug the parameters we're sending
            print(f"DEBUG: Calling image_to_image with:")
            print(f"- Image path: {image_path}")
            print(f"- Parameters: {params}")
            
            # Make the API call
            result = client.image_to_image(image_path, **params)
            return result
            
        except Exception as e:
            print(f"Error transforming image: {e}")
            print(f"Image type: {type(image)}")
            print(f"Model: {model}")
            print(f"Prompt: {prompt}")
            raise
            
        finally:
            # Clean up the temporary file if it was created
            if temp_file and os.path.exists(temp_file):
                try:
                    os.remove(temp_file)
                except Exception as e:
                    print(f"Warning: Could not delete temporary file {temp_file}: {e}")