app.py

import gradio as gr
import transformers
import torch
from PIL import Image

import os
from huggingface_hub import login

# Get token from environment variable
hf_token = os.getenv("hf_token")
if hf_token is None:
    raise ValueError("Please set HF_TOKEN environment variable with your Hugging Face token")

# Login with the token
login(token=hf_token)
# Chargement des modèles
translator = transformers.pipeline("translation", model="facebook/nllb-200-distilled-600M")
text_gen_pipeline = transformers.pipeline(
    "text-generation",
    # model = "ruslanmv/Medical-Llama3-v2",
    model="ContactDoctor/Bio-Medical-Llama-3-2-1B-CoT-012025",
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

# Message système initial
system_message = {
    "role": "system",
    "content": (
        "You are a helpful, respectful, and knowledgeable medical assistant developed by the AI team at AfriAI Solutions, Senegal. "
        "Provide brief, clear definitions when answering medical questions. After giving a concise response, ask the user if they would like more information about symptoms, causes, or treatments. "
        "Always encourage users to consult healthcare professionals for personalized advice."
    )
}

messages = [system_message]
max_history = 10

# Expressions reconnues
salutations = ["bonjour", "salut", "bonsoir", "coucou"]
remerciements = ["merci", "je vous remercie", "thanks"]
au_revoir = ["au revoir", "à bientôt", "bye", "bonne journée", "à la prochaine"]

def detect_smalltalk(user_input):
    lower_input = user_input.lower().strip()

    if any(phrase in lower_input for phrase in salutations):
        return "Bonjour ! Comment puis-je vous aider aujourd'hui ?", True
    if any(phrase in lower_input for phrase in remerciements):
        return "Avec plaisir ! Souhaitez-vous poser une autre question médicale ?", True
    if any(phrase in lower_input for phrase in au_revoir):
        return "Au revoir ! Prenez soin de votre santé et n'hésitez pas à revenir si besoin.", True

    return "", False

def medical_chatbot(user_input):
    global messages

    # Gestion des interactions sociales
    smalltalk_response, handled = detect_smalltalk(user_input)
    if handled:
        return smalltalk_response

    # Traduction français -> anglais
    translated = translator(user_input, src_lang="fra_Latn", tgt_lang="eng_Latn")[0]['translation_text']
    
    messages.append({"role": "user", "content": translated})
    if len(messages) > max_history * 2:
        messages = [system_message] + messages[-max_history * 2:]

    # Préparation du prompt
    prompt = text_gen_pipeline.tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=False)

    # Génération
    response = text_gen_pipeline(
        prompt,
        max_new_tokens=512,
        do_sample=True,
        temperature=0.4,
        top_k=150,
        top_p=0.75,
        eos_token_id=[
            text_gen_pipeline.tokenizer.eos_token_id,
            text_gen_pipeline.tokenizer.convert_tokens_to_ids("<|eot_id|>")
        ]
    )
    
    output = response[0]['generated_text'][len(prompt):].strip()

    # Traduction anglais -> français
    translated_back = translator(output, src_lang="eng_Latn", tgt_lang="fra_Latn")[0]['translation_text']
    
    messages.append({"role": "assistant", "content": translated_back})
    return translated_back

# Chargement du logo
logo = Image.open("AfriAI Solutions.jpg")

# Interface Gradio
with gr.Blocks(theme=gr.themes.Soft(primary_hue="indigo")) as demo:
    with gr.Row():
        gr.Image(value=logo, show_label=False, show_download_button=False, interactive=False, height=150)

    gr.Markdown(
        """
        # 🤖 Chatbot Médical AfriAI Solutions
        **Posez votre question médicale en français.**  
        Le chatbot vous répondra brièvement et avec bienveillance, puis vous demandera si vous souhaitez plus de détails.
        """,
        elem_id="title"
    )

    chatbot = gr.Chatbot(label="Chat avec le Médecin Virtuel", height=400)
    msg = gr.Textbox(label="Votre question", placeholder="Exemple : Quels sont les symptômes du paludisme ?")

    clear = gr.Button("Effacer la conversation", variant="secondary")

    def respond(message, history):
        response = medical_chatbot(message)
        history = history or []
        history.append((message, response))
        return "", history

    msg.submit(respond, [msg, chatbot], [msg, chatbot])
    clear.click(lambda: ("", []), None, [msg, chatbot])

demo.launch()