app.py

import os
import sys
import random
import gradio as gr
from datetime import datetime

# Add `src` directory to Python path
sys.path.append(os.path.join(os.path.dirname(__file__), "src"))

# Import your agent class from src/txagent/txagent.py
from txagent.txagent import TxAgent

# ==== Environment Setup ====
current_dir = os.path.dirname(os.path.abspath(__file__))
os.environ["MKL_THREADING_LAYER"] = "GNU"
os.environ["TOKENIZERS_PARALLELISM"] = "false"

# ==== UI Content ====
DESCRIPTION = '''
<div>
<h1 style="text-align: center;">TxAgent: An AI Agent for Therapeutic Reasoning Across a Universe of Tools </h1>
</div>
'''
INTRO = "Precision therapeutics require multimodal adaptive models..."
LICENSE = "DISCLAIMER: THIS WEBSITE DOES NOT PROVIDE MEDICAL ADVICE..."

PLACEHOLDER = '''
<div style="padding: 30px; text-align: center;">
   <h1 style="font-size: 28px; margin-bottom: 2px; opacity: 0.55;">TxAgent</h1>
   <p style="font-size: 18px;">Click clear 🗑️ before asking a new question.</p>
   <p style="font-size: 18px;">Click retry 🔄 to see another answer.</p>
</div>
'''

css = """
h1 { text-align: center; }
#duplicate-button {
  margin: auto;
  color: white;
  background: #1565c0;
  border-radius: 100vh;
}
.gradio-accordion {
    margin-top: 0px !important;
    margin-bottom: 0px !important;
}
"""

chat_css = """
.gr-button { font-size: 20px !important; }
.gr-button svg { width: 32px !important; height: 32px !important; }
"""

# ==== Model Settings ====
model_name = "mims-harvard/TxAgent-T1-Llama-3.1-8B"
rag_model_name = "mims-harvard/ToolRAG-T1-GTE-Qwen2-1.5B"
new_tool_files = {
    "new_tool": os.path.join(current_dir, "data", "new_tool.json")
}

question_examples = [
    ["Given a 50-year-old patient experiencing severe acute pain and considering the use of the newly approved medication, Journavx, how should the dosage be adjusted considering moderate hepatic impairment?"],
    ["A 30-year-old patient is on Prozac for depression and now diagnosed with WHIM syndrome. Is Xolremdi suitable?"]
]

# === Initialize the model ===
agent = TxAgent(
    model_name,
    rag_model_name,
    tool_files_dict=new_tool_files,
    force_finish=True,
    enable_checker=True,
    step_rag_num=10,
    seed=100,
    additional_default_tools=["DirectResponse", "RequireClarification"]
)
agent.init_model()

# === Gradio interface logic ===
def handle_chat(message, history, temperature, max_new_tokens, max_tokens, multi_agent, conversation, max_round):
    return agent.run_gradio_chat(message, history, temperature, max_new_tokens, max_tokens, multi_agent, conversation, max_round)

def update_seed():
    seed = random.randint(0, 10000)
    return agent.update_parameters(seed=seed)

# ✅ FIXED: handle_retry with return, no yield
def handle_retry(history, retry_data, temperature, max_new_tokens, max_tokens, multi_agent, conversation, max_round):
    update_seed()
    new_history = history[:retry_data.index]
    previous_prompt = history[retry_data.index]["content"]
    result = agent.run_gradio_chat(
        new_history + [{"role": "user", "content": previous_prompt}],
        temperature, max_new_tokens, max_tokens, multi_agent, conversation, max_round
    )
    # If it's a generator, convert to list to avoid Gradio errors
    if hasattr(result, "__iter__") and not isinstance(result, (str, dict, list)):
        result = list(result)
    return result

# ===== Build Gradio Interface =====
with gr.Blocks(css=css) as demo:
    gr.Markdown(DESCRIPTION)
    gr.Markdown(INTRO)

    temperature = gr.Slider(0, 1, step=0.1, value=0.3, label="Temperature")
    max_new_tokens = gr.Slider(128, 4096, step=1, value=1024, label="Max New Tokens")
    max_tokens = gr.Slider(128, 32000, step=1, value=8192, label="Max Total Tokens")
    max_round = gr.Slider(1, 50, step=1, value=30, label="Max Rounds")
    multi_agent = gr.Checkbox(label="Enable Multi-agent Reasoning", value=False)
    conversation_state = gr.State([])

    chatbot = gr.Chatbot(
        label="TxAgent",
        placeholder=PLACEHOLDER,
        height=700,
        type="messages",
        show_copy_button=True
    )

    # ✅ Retry logic added safely
    chatbot.retry(
        handle_retry,
        chatbot, chatbot,
        temperature, max_new_tokens, max_tokens,
        multi_agent, conversation_state, max_round
    )

    gr.ChatInterface(
        fn=handle_chat,
        chatbot=chatbot,
        additional_inputs=[
            temperature, max_new_tokens, max_tokens,
            multi_agent, conversation_state, max_round
        ],
        examples=question_examples,
        css=chat_css,
        cache_examples=False,
        fill_height=True,
        fill_width=True,
        stop_btn=True
    )

    gr.Markdown(LICENSE)

# ✅ Ensure launch works on Hugging Face Spaces
demo.launch()