import torch
from transformers import DistilBertTokenizerFast, DistilBertForQuestionAnswering

model_name = "distilbert-base-cased"
tokenizer = DistilBertTokenizerFast.from_pretrained(model_name)
model = DistilBertForQuestionAnswering.from_pretrained(model_name)

def format_response(start_index, end_index, raw_answer):
    answer_tokens = tokenizer.convert_tokens_to_string([tokenizer.convert_ids_to_tokens(i)[0] for i in range(start_index, end_index+1)])
    return answer_tokens.strip()

def get_answers(question, context):
    inputs = tokenizer.encode_plus(question, context, return_tensors="pt")
    start_scores, end_scores = model(**inputs).values()
    start_index = torch.argmax(start_scores)
    end_index = torch.argmax(end_scores) + 1
    formatted_answer = format_response(start_index, end_index - 1, context[start_index:end_index].tolist())
    return formatted_answer

def main():
    print("Hi! I am a simple AI chatbot built using Hugging Face.")
    print("Type 'quit' to exit the program.")
    while True:
        query = input("Your Question: ")#.strip()
        if query.lower() == "quit":
            break
        else:
            if len(query) > 0:
                context = "The capital of France is Paris."
                try:
                    response = get_answers(query, context)
                    print(f"\nResponse: {response}\n")
                except Exception as e:
                    print(f"\nError occurred: {str(e)}\n")

if __name__ == "__main__":
    main()