from typing import Dict, Any
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftConfig, PeftModel, AutoPeftModelForCausalLM
import torch.cuda

device = "cuda" if torch.cuda.is_available() else "cpu"

class EndpointHandler():
    def __init__(self, path=""):
        # config = PeftConfig.from_pretrained(path)
        # model = AutoModelForCausalLM.from_pretrained(config.base_model_name_or_path, device_map="auto")#, load_in_8bit=True, device_map='auto')
        self.tokenizer = AutoTokenizer.from_pretrained("EleutherAI/gpt-j-6b")
        self.model = AutoPeftModelForCausalLM.from_pretrained("ksee/testgptj")

    def __call__(self, data: Dict[str, Any]) -> Dict[str, Any]:
        """
        Args:
            data (Dict): The payload with the text prompt 
        and generation parameters.
        """
        # Get inputs
        prompt = data.pop("inputs", None)
        parameters = data.pop("parameters", None)
        if prompt is None:
            raise ValueError("Missing prompt.")
        # Preprocess
        input_ids = self.tokenizer(prompt, return_tensors="pt")["input_ids"].to(device)
        # Forward
        # if parameters is not None:
        #     output = self.model.generate(input_ids=input_ids, **parameters)
        # else:
        #     output = self.model.generate(input_ids=input_ids)
        output = self.model.generate(input_ids, temperature=0.9, max_new_tokens=50)
        # Postprocess
        prediction = self.tokenizer.batch_decode(outputs.detach().cpu().numpy(), skip_special_tokens=True)[0]
        return {"generated_text": prediction}