app.py

# app.py — full version with memory + web search + datasets

import os
import json
import threading
import gradio as gr
from huggingface_hub import InferenceClient, snapshot_download
from datasets import load_dataset
from duckduckgo_search import DDGS


# ---------------- CONFIG ----------------
MODEL_ID = "openai/gpt-oss-120b"   # or granite
DATA_DIR = "/data" if os.path.isdir("/data") else "./data"
os.makedirs(DATA_DIR, exist_ok=True)

SHORT_TERM_LIMIT = 10
SUMMARY_MAX_TOKENS = 150
MEMORY_LOCK = threading.Lock()

# ---------------- dataset loading ----------------
# ⚠️ Heavy startup, comment out if running on free HF Space
folder = snapshot_download(
    "HuggingFaceFW/fineweb",
    repo_type="dataset",
    local_dir="./fineweb/",
    allow_patterns="sample/10BT/*",
)
ds1 = load_dataset("HuggingFaceH4/ultrachat_200k")
ds2 = load_dataset("Anthropic/hh-rlhf")

# ---------------- helpers: memory ----------------
def get_user_id(hf_token: gr.OAuthToken | None):
    if hf_token and getattr(hf_token, "token", None):
        return "user_" + hf_token.token[:12]
    return "anon"

def memory_file_path(user_id: str):
    return os.path.join(DATA_DIR, f"memory_{user_id}.json")

def load_memory(user_id: str):
    p = memory_file_path(user_id)
    if os.path.exists(p):
        try:
            with open(p, "r", encoding="utf-8") as f:
                mem = json.load(f)
                if isinstance(mem, dict) and "short_term" in mem and "long_term" in mem:
                    return mem
        except Exception as e:
            print("load_memory error:", e)
    return {"short_term": [], "long_term": ""}

def save_memory(user_id: str, memory: dict):
    p = memory_file_path(user_id)
    try:
        with MEMORY_LOCK:
            with open(p, "w", encoding="utf-8") as f:
                json.dump(memory, f, ensure_ascii=False, indent=2)
    except Exception as e:
        print("save_memory error:", e)

# ---------------- normalize history ----------------
def normalize_history(history):
    out = []
    if not history: return out
    for turn in history:
        if isinstance(turn, dict) and "role" in turn and "content" in turn:
            out.append({"role": turn["role"], "content": str(turn["content"])})
        elif isinstance(turn, (list, tuple)) and len(turn) == 2:
            user_msg, assistant_msg = turn
            out.append({"role": "user", "content": str(user_msg)})
            out.append({"role": "assistant", "content": str(assistant_msg)})
        elif isinstance(turn, str):
            out.append({"role": "user", "content": turn})
    return out

# ---------------- sync completion ----------------
def _get_chat_response_sync(client: InferenceClient, messages, max_tokens=SUMMARY_MAX_TOKENS, temperature=0.3, top_p=0.9):
    try:
        resp = client.chat_completion(messages, max_tokens=max_tokens, temperature=temperature, top_p=top_p, stream=False)
    except Exception as e:
        print("sync chat_completion error:", e)
        return ""

    try:
        choices = resp.get("choices") if isinstance(resp, dict) else getattr(resp, "choices", None)
        if choices:
            c0 = choices[0]
            msg = c0.get("message") if isinstance(c0, dict) else getattr(c0, "message", None)
            if isinstance(msg, dict):
                return msg.get("content", "")
            return getattr(msg, "content", "") or str(msg or "")
    except Exception:
        pass
    return ""

# ---------------- web search ----------------
def web_search(query, num_results=3):
    try:
        with DDGS() as ddgs:
            results = list(ddgs.text(query, max_results=num_results))
        search_context = "🔍 Web Search Results:\n\n"
        for i, r in enumerate(results, 1):
            title = r.get("title", "")[:200]
            body = r.get("body", "")[:200].replace("\n", " ")
            href = r.get("href", "")
            search_context += f"{i}. {title}\n{body}...\nSource: {href}\n\n"
        return search_context
    except Exception as e:
        return f"❌ Search error: {str(e)}"

# ---------------- summarization ----------------
def summarize_old_messages(client: InferenceClient, old_messages):
    text = "\n".join([f"{m['role']}: {m['content']}" for m in old_messages])
    system = {"role": "system", "content": "You are a summarizer. Summarize <=150 words."}
    user = {"role": "user", "content": text}
    return _get_chat_response_sync(client, [system, user])

# ---------------- memory tools ----------------
def show_memory(hf_token: gr.OAuthToken | None = None):
    user = get_user_id(hf_token)
    p = memory_file_path(user)
    if not os.path.exists(p):
        return "ℹ️ No memory file found for user: " + user
    with open(p, "r", encoding="utf-8") as f:
        return f.read()

def clear_memory(hf_token: gr.OAuthToken | None = None):
    user = get_user_id(hf_token)
    p = memory_file_path(user)
    if os.path.exists(p):
        os.remove(p)
        return f"✅ Memory cleared for {user}"
    return "ℹ️ No memory to clear."

# ---------------- main chat ----------------
def respond(message, history: list, system_message, max_tokens, temperature, top_p,
            enable_search, enable_persistent_memory, hf_token: gr.OAuthToken = None):

    client = InferenceClient(token=(hf_token.token if hf_token else None), model=MODEL_ID)
    user_id = get_user_id(hf_token)
    memory = load_memory(user_id) if enable_persistent_memory else {"short_term": [], "long_term": ""}

    session_history = normalize_history(history)
    combined = memory.get("short_term", []) + session_history

    if len(combined) > SHORT_TERM_LIMIT:
        to_summarize = combined[:len(combined) - SHORT_TERM_LIMIT]
        summary = summarize_old_messages(client, to_summarize)
        if summary:
            memory["long_term"] = (memory.get("long_term", "") + "\n" + summary).strip()
        combined = combined[-SHORT_TERM_LIMIT:]

    combined.append({"role": "user", "content": message})
    memory["short_term"] = combined
    if enable_persistent_memory:
        save_memory(user_id, memory)

    messages = [{"role": "system", "content": system_message}]
    if memory.get("long_term"):
        messages.append({"role": "system", "content": "Long-term memory:\n" + memory["long_term"]})
    messages.extend(memory["short_term"])

    if enable_search and any(k in message.lower() for k in ["search", "google", "tin tức", "news", "what is"]):
        sr = web_search(message)
        messages.append({"role": "user", "content": f"{sr}\n\nBased on search results, answer: {message}"})

    response = ""
    try:
        for chunk in client.chat_completion(messages, max_tokens=int(max_tokens),
                                            stream=True, temperature=float(temperature), top_p=float(top_p)):
            choices = chunk.get("choices") if isinstance(chunk, dict) else getattr(chunk, "choices", None)
            if not choices: continue
            c0 = choices[0]
            delta = c0.get("delta") if isinstance(c0, dict) else getattr(c0, "delta", None)
            token = None
            if delta and (delta.get("content") if isinstance(delta, dict) else getattr(delta, "content", None)):
                token = delta.get("content") if isinstance(delta, dict) else getattr(delta, "content", None)
            else:
                msg = c0.get("message") if isinstance(c0, dict) else getattr(c0, "message", None)
                if isinstance(msg, dict):
                    token = msg.get("content", "")
                else:
                    token = getattr(msg, "content", None) or str(msg or "")
            if token:
                response += token
                yield response
    except Exception as e:
        yield f"⚠️ Inference error: {e}"
        return

    memory["short_term"].append({"role": "assistant", "content": response})
    memory["short_term"] = memory["short_term"][-SHORT_TERM_LIMIT:]
    if enable_persistent_memory:
        save_memory(user_id, memory)

# ---------------- Gradio UI ----------------
chatbot = gr.ChatInterface(
    respond,
    type="messages",
    additional_inputs=[
        gr.Textbox(value="You are a helpful AI assistant.", label="System message"),
        gr.Slider(1, 2048, value=512, step=1, label="Max new tokens"),
        gr.Slider(0.1, 4.0, value=0.7, step=0.1, label="Temperature"),
        gr.Slider(0.1, 1.0, value=0.95, step=0.05, label="Top-p"),
        gr.Checkbox(value=True, label="Enable Web Search 🔍"),
        gr.Checkbox(value=True, label="Enable Persistent Memory"),
    ],
)

with gr.Blocks(title="AI Chatbot (full version)") as demo:
    gr.Markdown("# 🤖 AI Chatbot with Memory + Web Search + Datasets")
    with gr.Sidebar():
        gr.LoginButton()
        gr.Markdown("### Memory Tools")
        gr.Button("👀 Show Memory").click(show_memory, inputs=None, outputs=gr.Textbox(label="Memory"))
        gr.Button("🗑️ Clear Memory").click(clear_memory, inputs=None, outputs=gr.Textbox(label="Status"))
    chatbot.render()

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