# import gradio as gr
# from huggingface_hub import InferenceClient

# """
# For more information on `huggingface_hub` Inference API support, please check the docs: https://huggingface.co/docs/huggingface_hub/v0.22.2/en/guides/inference
# """
# client = InferenceClient("HuggingFaceH4/zephyr-7b-beta")


# def respond(
#     message,
#     history: list[tuple[str, str]],
#     system_message,
#     max_tokens,
#     temperature,
#     top_p,
# ):
#     messages = [{"role": "system", "content": system_message}]

#     for val in history:
#         if val[0]:
#             messages.append({"role": "user", "content": val[0]})
#         if val[1]:
#             messages.append({"role": "assistant", "content": val[1]})

#     messages.append({"role": "user", "content": message})

#     response = ""

#     for message in client.chat_completion(
#         messages,
#         max_tokens=max_tokens,
#         stream=True,
#         temperature=temperature,
#         top_p=top_p,
#     ):
#         token = message.choices[0].delta.content

#         response += token
#         yield response

# """
# For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface
# """
# demo = gr.ChatInterface(
#     respond,
#     additional_inputs=[
#         gr.Textbox(value="You are a friendly Chatbot.", label="System message"),
#         gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max new tokens"),
#         gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature"),
#         gr.Slider(
#             minimum=0.1,
#             maximum=1.0,
#             value=0.95,
#             step=0.05,
#             label="Top-p (nucleus sampling)",
#         ),
#     ],
# )


# if __name__ == "__main__":
#     demo.launch()



import gradio as gr
import torch
from transformers import RagRetriever, RagSequenceForGeneration, AutoTokenizer

"""
For more information on `huggingface_hub` Inference API support, please check the docs: https://huggingface.co/docs/huggingface_hub/v0.22.2/en/guides/inference
"""

def strip_title(title):
    if title.startswith('"'):
        title = title[1:]
    if title.endswith('"'):
        title = title[:-1]
    return title

def retrieved_info(rag_model, query):
    # Tokenize query
    retriever_input_ids = rag_model.retriever.question_encoder_tokenizer.batch_encode_plus(
        [query],
        return_tensors="pt",
        padding=True,
        truncation=True,
    )["input_ids"].to(device)

    # Retrieve documents
    question_enc_outputs = rag_model.rag.question_encoder(retriever_input_ids)
    question_enc_pool_output = question_enc_outputs[0]

    result = rag_model.retriever(
        retriever_input_ids,
        question_enc_pool_output.cpu().detach().to(torch.float32).numpy(),
        prefix=rag_model.rag.generator.config.prefix,
        n_docs=rag_model.config.n_docs,
        return_tensors="pt",
    )

    # Display retrieved documents including URLs
    all_docs = rag_model.retriever.index.get_doc_dicts(result.doc_ids)
    retrieved_context = []
    for docs in all_docs:
        titles = [strip_title(title) for title in docs["title"]]
        texts = docs["text"]
        for title, text in zip(titles, texts):
            #print(f"Title: {title}")
            #print(f"Context: {text}")
            retrieved_context.append(f"{title}: {text}")

    answer = retrieved_context




def respond(
    message,
    history: list[tuple[str, str]],
    system_message,
    max_tokens = None,
    temperature = None,
    top_p = None,
):
    # Load model
    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
    
    dataset_path = "./IndexedDataFiles/my_knowledge_dataset"
    index_path = "./IndexedDataFiles/my_knowledge_dataset_hnsw_index.faiss"
    
    tokenizer = AutoTokenizer.from_pretrained("facebook/rag-sequence-nq")
    retriever = RagRetriever.from_pretrained("facebook/rag-sequence-nq", index_name="custom",
                                             passages_path = dataset_path,
                                             index_path = index_path,
                                             n_docs = 1)
    rag_model = RagSequenceForGeneration.from_pretrained('facebook/rag-sequence-nq', retriever=retriever)
    rag_model.retriever.init_retrieval()
    rag_model.to(device)

    if message:  # If there's a user query
        response = retrieved_info(rag_model, message)  # Get the answer from your local FAISS and Q&A model
        return response

    # In case no message, return an empty string
    return ""
    
    

"""
For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface
"""
demo = gr.ChatInterface(
    respond,
    additional_inputs=[
        gr.Textbox(value="You are a friendly Chatbot.", label="System message"),
        gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max new tokens"),
        gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature"),
        gr.Slider(
            minimum=0.1,
            maximum=1.0,
            value=0.95,
            step=0.05,
            label="Top-p (nucleus sampling)",
        ),
    ],
)


if __name__ == "__main__":
    demo.launch()