import gradio as gr
from huggingface_hub import InferenceClient

# Function to return the appropriate client based on the model selected
def client_fn(model):
    model_map = {
        "Nous Hermes Mixtral 8x7B DPO": "NousResearch/Nous-Hermes-2-Mixtral-8x7B-DPO",
        "StarChat2 15b": "HuggingFaceH4/starchat2-15b-v0.1",
        "Mistral 7B v0.3": "mistralai/Mistral-7B-Instruct-v0.3",
        "Phi 3 mini": "microsoft/Phi-3-mini-4k-instruct",
        "Mixtral 8x7B": "mistralai/Mixtral-8x7B-Instruct-v0.1"
    }
    return InferenceClient(model_map.get(model, "mistralai/Mixtral-8x7B-Instruct-v0.1"))

system_instructions = ("[SYSTEM] You are a chat bot named 'NITHIYASRI'S CHATBOT'."
                       "Your task is to Answer the question."
                       "Keep conversation very short, clear and concise."
                       "Respond naturally and concisely to the user's queries. "
                       "The expectation is that you will avoid introductions and start answering the query directly, Only answer the question asked by user, Do not say unnecessary things."
                       "Begin with a greeting if the user initiates the conversation. "
                       "Here is the user's query:[QUESTION] ")

# Function to generate model responses
def models(text, model="Mixtral 8x7B"):
    client = client_fn(model)
    generate_kwargs = {
        "max_new_tokens": 100,
        "do_sample": True,
    }
    
    formatted_prompt = f"{system_instructions} {text} [ANSWER]"
    stream = client.text_generation(formatted_prompt, **generate_kwargs, stream=True, details=True, return_full_text=False)
    
    output = ""
    for response in stream:
        output += response.token.text
        if output.endswith("</s>"):
            output = output[:-4]
    return output

# Gradio interface description and configuration
description = """# NITHIYASRI'S CHATBOT-VIVEKANANDHA SCHOOL CBSE
### Inspired from ARTIFICIAL INTELLIGENCE"""

with gr.Blocks() as demo:
    gr.Markdown(description)
    
    text_input = gr.Textbox(label="Enter your message here:")
    dropdown = gr.Dropdown(['Mixtral 8x7B', 'Nous Hermes Mixtral 8x7B DPO', 'StarChat2 15b', 'Mistral 7B v0.3', 'Phi 3 mini'], value="Mistral 7B v0.3", label="Select Model")
    submit_btn = gr.Button("Send")
    output_text = gr.Textbox(label="Response")
    
    submit_btn.click(fn=models, inputs=[text_input, dropdown], outputs=output_text)

# Queue and launch configuration for Gradio
demo.queue(max_size=300000)
demo.launch()