from typing import Dict, List, Any
from PIL import Image
from io import BytesIO
from transformers import CLIPProcessor, CLIPModel
import base64
import torch

class EndpointHandler():
    def __init__(self, path="."):
        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
     
        self.model = CLIPModel.from_pretrained(path).to(self.device).eval()
        self.processor = CLIPProcessor.from_pretrained(path)
    
    def __call__(self, data: Dict[str, Any]) -> List[Dict[str, Any]]:
        """
       data args:
            images (:obj:`PIL.Image`)
            candiates (:obj:`list`)
      Return:
            A :obj:`list`:. The list contains items that are dicts should be liked {"label": "XXX", "score": 0.82}
        """
        inputs = data.pop("inputs", data)

        # decode base64 image to PIL
        image = Image.open(BytesIO(base64.b64decode(inputs['image'])))
        txt = inputs['text']
        # preprocess image
        txt = self.processor(text=txt, return_tensors="pt",padding=True).to(self.device)
        image = self.processor(images=image, return_tensors="pt",padding=True).to(self.device)
        with torch.no_grad():
            txt_features = self.model.get_text_features(**txt)
            image_features = self.model.get_image_features(**image)
        img = image_features.tolist()
        txt = txt_features.tolist()
        pred = {"image": img, "text": txt}

        return pred