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import gradio as gr
import google.generativeai as genai
import datetime
import uuid
import os
import tempfile
import pymongo
import sqlite3
import certifi
from bson.objectid import ObjectId

# --- 1. ํ•˜์ด๋ธŒ๋ฆฌ๋“œ DB ์„ค์ • ---
MONGO_URI = os.environ.get("MONGO_URI")
USE_MONGO = False # ๊ธฐ๋ณธ๊ฐ’์€ False, ์—ฐ๊ฒฐ ์„ฑ๊ณต ์‹œ True๋กœ ๋ณ€๊ฒฝ

# 1-1. MongoDB ์—ฐ๊ฒฐ ์‹œ๋„
if MONGO_URI:
    try:
        print("๐Ÿ”Œ MongoDB ์—ฐ๊ฒฐ ์‹œ๋„ ์ค‘...")
        client = pymongo.MongoClient(
            MONGO_URI,
            serverSelectionTimeoutMS=3000, # 3์ดˆ ๋‚ด ์‘๋‹ต ์—†์œผ๋ฉด ํฌ๊ธฐ
            tls=True,
            tlsAllowInvalidCertificates=True,
            tlsAllowInvalidHostnames=True
        )
        client.admin.command('ping')
        USE_MONGO = True
        print("โœ… MongoDB ์—ฐ๊ฒฐ ์„ฑ๊ณต! (์›๊ฒฉ ์ €์žฅ์†Œ ์‚ฌ์šฉ)")
        db = client.story_assistant_db
        interactions_col = db.interactions
        summaries_col = db.summaries
    except Exception as e:
        print(f"โš ๏ธ MongoDB ์—ฐ๊ฒฐ ์‹คํŒจ: {e}")
        print("๐Ÿ”€ SQLite ๋กœ์ปฌ ์ €์žฅ์†Œ๋กœ ์ „ํ™˜ํ•ฉ๋‹ˆ๋‹ค.")
        USE_MONGO = False
else:
    print("โ„น๏ธ MONGO_URI๊ฐ€ ์—†์Šต๋‹ˆ๋‹ค. SQLite ๋กœ์ปฌ ์ €์žฅ์†Œ๋ฅผ ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค.")

# 1-2. SQLite ์„ค์ • (MongoDB ์‹คํŒจ ์‹œ ๋ฐฑ์—…์šฉ)
if not USE_MONGO:
    # Hugging Face Spaces์˜ ์˜๊ตฌ ์ €์žฅ์†Œ ๊ฒฝ๋กœ(/data)๊ฐ€ ์žˆ์œผ๋ฉด ๊ฑฐ๊ธฐ ์ €์žฅ, ์—†์œผ๋ฉด ์ผ๋ฐ˜ ํŒŒ์ผ
    DB_PATH = os.path.join("/data", "logs.db") if os.path.exists("/data") else "logs.db"
    print(f"๐Ÿ“‚ SQLite ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๊ฒฝ๋กœ: {DB_PATH}")
    
    conn = sqlite3.connect(DB_PATH, check_same_thread=False)
    cursor = conn.cursor()
    cursor.execute('''
    CREATE TABLE IF NOT EXISTS interactions (
        session_id TEXT, user_id TEXT, timestamp TEXT, role TEXT, content TEXT
    )
    ''')
    cursor.execute('''
    CREATE TABLE IF NOT EXISTS summaries (
        session_id TEXT, user_id TEXT, timestamp TEXT, summary TEXT
    )
    ''')
    conn.commit()

# --- 2. ํ†ตํ•ฉ DB ํ•จ์ˆ˜๋“ค (ํ•˜์ด๋ธŒ๋ฆฌ๋“œ) ---
def log_interaction(session_id, user_id, role, content):
    timestamp = datetime.datetime.now().isoformat()
    if USE_MONGO:
        try:
            interactions_col.insert_one({
                "session_id": session_id, "user_id": user_id,
                "timestamp": timestamp, "role": role, "content": content
            })
        except Exception as e: print(f"DB Log Error (Mongo): {e}")
    else:
        try:
            cursor.execute("INSERT INTO interactions VALUES (?, ?, ?, ?, ?)", 
                          (session_id, user_id, timestamp, role, content))
            conn.commit()
        except Exception as e: print(f"DB Log Error (SQLite): {e}")

def log_summary(session_id, user_id, summary_text):
    timestamp = datetime.datetime.now().isoformat()
    if USE_MONGO:
        try:
            summaries_col.insert_one({
                "session_id": session_id, "user_id": user_id,
                "timestamp": timestamp, "summary": summary_text
            })
        except Exception as e: print(f"DB Summary Error (Mongo): {e}")
    else:
        try:
            cursor.execute("INSERT INTO summaries VALUES (?, ?, ?, ?)", 
                          (session_id, user_id, timestamp, summary_text))
            conn.commit()
        except Exception as e: print(f"DB Summary Error (SQLite): {e}")

def fetch_history(session_id):
    if USE_MONGO:
        try:
            cursor_mongo = interactions_col.find({"session_id": session_id}).sort("timestamp", 1)
            return [(doc["role"], doc["content"], doc["timestamp"]) for doc in cursor_mongo]
        except Exception as e:
            print(f"DB Fetch Error (Mongo): {e}")
            return []
    else:
        try:
            cursor.execute("SELECT role, content, timestamp FROM interactions WHERE session_id=? ORDER BY timestamp", (session_id,))
            return cursor.fetchall()
        except Exception as e:
            print(f"DB Fetch Error (SQLite): {e}")
            return []

# --- 3. LLM API ์„ค์ • ---
api_key = os.environ.get("GEMINI_API_KEY")
if not api_key:
    try:
        with open("api_key.txt", "r") as f: api_key = f.read().strip()
    except: pass
if not api_key: print("โš ๏ธ GEMINI_API_KEY๊ฐ€ ์„ค์ •๋˜์ง€ ์•Š์•˜์Šต๋‹ˆ๋‹ค.")

genai.configure(api_key=api_key)

try:
    with open("system_prompt.txt", "r", encoding="utf-8") as f: SYSTEM_PROMPT = f.read()
except: SYSTEM_PROMPT = "๋‹น์‹ ์€ ์นœ์ ˆํ•œ ์ฑ—๋ด‡์ž…๋‹ˆ๋‹ค."

# ๋ชจ๋ธ๋ช… ์žฌํ™•์ธ (gemini-1.5-flash)
model = genai.GenerativeModel(model_name='gemini-2.5-flash', system_instruction=SYSTEM_PROMPT)

WELCOME_MESSAGE = (
    "์•ˆ๋…•ํ•˜์„ธ์š”, ์„ ์ƒ๋‹˜. '์ด์•ผ๊ธฐ ๋น„์„œ'์ž…๋‹ˆ๋‹ค.\n"
    "์˜ค๋Š˜ ์ž์„œ์ „์˜ ์ฒซ ์ฑ•ํ„ฐ๋ฅผ ์œ„ํ•ด, **๊ฐ€์žฅ ๋จผ์ € ๋– ์˜ค๋ฅด๋Š” ์ด์•ผ๊ธฐ**๋ฅผ ๋“ค๋ ค์ฃผ์‹œ๊ฒ ์–ด์š”?\n\n"
    "1. **์œ ๋…„ ์‹œ์ ˆ**์˜ ์ถ”์–ต\n2. ์ธ์ƒ **์ตœ๊ณ ์˜ ์Œ์‹**\n3. **์ฒซ ์ง์žฅ**์˜ ๊ธฐ์–ต\n4. **๋ฐฐ์šฐ์ž**์™€์˜ ์ฒซ ๋งŒ๋‚จ\n\n"
    "์œ„ ์ฃผ์ œ ์ค‘ ํ•˜๋‚˜๋ฅผ ๊ณจ๋ผ์ฃผ์‹œ๊ฑฐ๋‚˜, ํŽธํ•˜๊ฒŒ ๋‹ค๋ฅธ ๋ง์”€์„ ํ•ด์ฃผ์…”๋„ ์ข‹์Šต๋‹ˆ๋‹ค."
)

# --- 4. ํ•ต์‹ฌ ๋กœ์ง ---
def format_history_for_llm(history):
    llm_history = []
    for msg in history:
        if msg['role'] == 'user':
             llm_history.append({"role": "user", "parts": [{"text": msg['content']}]})
        elif msg['role'] == 'assistant':
             llm_history.append({"role": "model", "parts": [{"text": msg['content']}]})
    return llm_history

def chat(user_input, history, session_id, user_id):
    if not user_input.strip(): return "", history
    
    history.append({"role": "user", "content": user_input})
    log_interaction(session_id, user_id, 'user', user_input)
    yield "", history 
    
    llm_history = format_history_for_llm(history[:-1])
    chat_session = model.start_chat(history=llm_history)
    try:
        response = chat_session.send_message(user_input, stream=True)
        full_response = ""
        history.append({"role": "assistant", "content": ""})
        for chunk in response:
            full_response += chunk.text
            history[-1]['content'] = full_response
            yield "", history
        log_interaction(session_id, user_id, 'model', full_response)
    except Exception as e:
        history.append({"role": "assistant", "content": f"โš ๏ธ ์˜ค๋ฅ˜๊ฐ€ ๋ฐœ์ƒํ–ˆ์Šต๋‹ˆ๋‹ค: {str(e)}"})
        yield "", history

def change_topic(history, session_id, user_id):
    if not history: return history
    llm_history = format_history_for_llm(history)
    chat_session = model.start_chat(history=llm_history)
    summary_prompt = (
        "์ง€๊ธˆ๊นŒ์ง€ ๋‚˜๋ˆˆ ๋Œ€ํ™” ๋‚ด์šฉ์„ '์„ ์ƒ๋‹˜์€ ~ ๊ฒฝํ—˜์„ ํ•˜์…จ์Šต๋‹ˆ๋‹ค'์™€ ๊ฐ™์€ ๋ฌธ์ฒด๋กœ "
        "3๋ฌธ์žฅ ์ด๋‚ด๋กœ ๊ฐ„๋žตํ•˜๊ฒŒ ์š”์•ฝํ•ด์ค˜. ์ด ์š”์•ฝ์€ ๊ธฐ๋ก์„ ์œ„ํ•œ ๊ฒƒ์ด์•ผ."
    )
    try:
        response = chat_session.send_message(summary_prompt)
        summary_text = response.text
        log_summary(session_id, user_id, summary_text)
        end_message = f"\n\n[๊ธฐ๋ก ์™„๋ฃŒ] ์ง€๊ธˆ๊นŒ์ง€์˜ ์ด์•ผ๊ธฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์ž˜ ๊ธฐ๋กํ•ด ๋‘์—ˆ์Šต๋‹ˆ๋‹ค.\n\n๐Ÿ“ **์š”์•ฝ:** {summary_text}\n\n์ž, ๊ทธ๋Ÿผ ์ด์ œ ๋‹ค๋ฅธ ์ฃผ์ œ๋กœ ๋„˜์–ด๊ฐ€ ๋ณผ๊นŒ์š”? ์–ด๋–ค ์ด์•ผ๊ธฐ๋ฅผ ๋” ๋“ค๋ ค์ฃผ์‹œ๊ฒ ์–ด์š”?"
        history.append({"role": "assistant", "content": end_message})
        return history
    except Exception as e:
        history.append({"role": "assistant", "content": f"โš ๏ธ ์š”์•ฝ ์ค‘ ์˜ค๋ฅ˜๊ฐ€ ๋ฐœ์ƒํ–ˆ์Šต๋‹ˆ๋‹ค: {str(e)}"})
        return history

def export_chat_txt(session_id):
    data = fetch_history(session_id)
    if not data: return None
    text_content = f"์ž์„œ์ „ ์ธํ„ฐ๋ทฐ ๊ธฐ๋ก (Session: {session_id})\n์ €์žฅ ์ผ์‹œ: {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n" + "=" * 50 + "\n\n"
    for role, content, timestamp in data:
        speaker = "์„ ์ƒ๋‹˜" if role == 'user' else "์ด์•ผ๊ธฐ ๋น„์„œ"
        text_content += f"[{timestamp.split('T')[1][:5]}] {speaker}:\n{content}\n\n" + "-" * 20 + "\n\n"
    fd, path = tempfile.mkstemp(suffix=".txt", prefix=f"interview_{session_id[:8]}_")
    with os.fdopen(fd, 'w', encoding='utf-8') as f: f.write(text_content)
    return path

def export_chat_md(session_id):
    data = fetch_history(session_id)
    if not data: return None
    md_content = f"# ๐Ÿ“œ ์ž์„œ์ „ ์ธํ„ฐ๋ทฐ ๊ธฐ๋ก\n\n> **์„ธ์…˜ ID:** `{session_id}`<br>**์ €์žฅ ์ผ์‹œ:** {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n---\n\n"
    for role, content, timestamp in data:
        speaker = "๐Ÿง‘โ€๐Ÿซ ์„ ์ƒ๋‹˜" if role == 'user' else "๐Ÿค– ์ด์•ผ๊ธฐ ๋น„์„œ"
        md_content += f"### {speaker} <span style='color:gray;font-size:0.8em'>({timestamp.split('T')[1][:5]})</span>\n\n{content}\n\n"
    fd, path = tempfile.mkstemp(suffix=".md", prefix=f"interview_{session_id[:8]}_")
    with os.fdopen(fd, 'w', encoding='utf-8') as f: f.write(md_content)
    return path

# --- 5. UI ๊ตฌ์„ฑ ---
def start_chat(user_id_val):
    if not user_id_val.strip():
        return gr.update(visible=True), gr.update(visible=False), "โš ๏ธ ํ…Œ์Šคํ„ฐ ID๋ฅผ ์ž…๋ ฅํ•ด์ฃผ์„ธ์š”!"
    return gr.update(visible=False), gr.update(visible=True), ""

with gr.Blocks(theme=gr.themes.Soft()) as demo:
    session_id = gr.State(lambda: str(uuid.uuid4()))
    user_id = gr.State("")

    with gr.Group(visible=True) as login_view:
        gr.Markdown("# ๐Ÿ‘‹ ํ™˜์˜ํ•ฉ๋‹ˆ๋‹ค! ์ด์•ผ๊ธฐ ๋น„์„œ ํ…Œ์ŠคํŠธ๋ฅผ ์‹œ์ž‘ํ•ฉ๋‹ˆ๋‹ค.")
        gr.Markdown("์›ํ™œํ•œ ๊ธฐ๋ก์„ ์œ„ํ•ด ํ…Œ์Šคํ„ฐ ID(๋‹‰๋„ค์ž„)๋ฅผ ์ž…๋ ฅํ•ด์ฃผ์„ธ์š”.")
        with gr.Row():
            login_id_input = gr.Textbox(label="ํ…Œ์Šคํ„ฐ ID", placeholder="์˜ˆ: tester_hong, ํ–‰๋ณตํ•œํ•˜๋ฃจ", scale=3, autofocus=True)
            login_btn = gr.Button("๐Ÿš€ ์‹œ์ž‘ํ•˜๊ธฐ", variant="primary", scale=1)
        login_msg = gr.Markdown("", visible=True)

    with gr.Group(visible=False) as chat_view:
        gr.Markdown("# ๐Ÿ“ ์ด์•ผ๊ธฐ ๋น„์„œ (ํ”„๋กœํ† ํƒ€์ž…)")
        
        # DB ์ƒํƒœ ํ‘œ์‹œ (๋””๋ฒ„๊น…์šฉ)
        db_status = "๐ŸŸข MongoDB ์—ฐ๊ฒฐ๋จ" if USE_MONGO else "๐ŸŸ  SQLite ๋กœ์ปฌ ๋ชจ๋“œ (์ฃผ์˜: ์žฌ์‹œ์ž‘ ์‹œ ๋ฐ์ดํ„ฐ ์ดˆ๊ธฐํ™” ๊ฐ€๋Šฅ)"
        gr.Markdown(f"โ„น๏ธ ์‹œ์Šคํ…œ ์ƒํƒœ: {db_status}")

        with gr.Row():
            with gr.Column(scale=3):
                chatbot = gr.Chatbot(
                    value=[{"role": "assistant", "content": WELCOME_MESSAGE}],
                    height=650,
                    label="๋Œ€ํ™”์ฐฝ",
                    type="messages",
                    avatar_images=(None, "https://i.ibb.co/ZHrkBPm/ai-assistant.png")
                )
                with gr.Row():
                    msg_input = gr.Textbox(scale=4, show_label=False, placeholder="์—ฌ๊ธฐ์— ์ด์•ผ๊ธฐ๋ฅผ ์ž…๋ ฅํ•˜์„ธ์š”...", container=False)
                    submit_btn = gr.Button("์ „์†ก", scale=1, variant="primary")
                with gr.Row():
                    topic_change_btn = gr.Button("๐Ÿ”„ ์ด ์ฃผ์ œ ๋งˆ๋ฌด๋ฆฌํ•˜๊ณ  ๋‹ค๋ฅธ ์ด์•ผ๊ธฐ ํ•˜๊ธฐ", variant="secondary", scale=1)
            
            with gr.Column(scale=1):
                gr.Markdown("### ๐Ÿ› ๏ธ ํ…Œ์Šคํ„ฐ ์ •๋ณด")
                user_id_display = gr.Textbox(label="ํ˜„์žฌ ์ ‘์† ID", interactive=False)
                gr.Markdown("### ๐Ÿ’ก ์‚ฌ์šฉ ๊ฐ€์ด๋“œ")
                gr.Markdown("- **์ด์•ผ๊ธฐ ์‹œ์ž‘:** ๋ด‡์˜ ์งˆ๋ฌธ์— ํŽธํ•˜๊ฒŒ ๋‹ตํ•ด์ฃผ์„ธ์š”.\n- **์ฃผ์ œ ๋ณ€๊ฒฝ:** ์ฑ„ํŒ…์ฐฝ ์•„๋ž˜ **'๐Ÿ”„ ์ด ์ฃผ์ œ ๋งˆ๋ฌด๋ฆฌ...'** ๋ฒ„ํŠผ์„ ๋ˆŒ๋Ÿฌ์ฃผ์„ธ์š”.")
                gr.Markdown("### ๐Ÿ’พ ๋Œ€ํ™” ๋‚ด์šฉ ๋‚ด๋ณด๋‚ด๊ธฐ")
                with gr.Row():
                    export_txt_btn = gr.Button("๐Ÿ“„ TXT")
                    export_md_btn = gr.Button("๐Ÿ“ MD")
                download_file = gr.File(label="๋‹ค์šด๋กœ๋“œ", interactive=False, height=100)

    login_btn.click(start_chat, inputs=[login_id_input], outputs=[login_view, chat_view, login_msg]).then(
        lambda id_val: (id_val, id_val), inputs=[login_id_input], outputs=[user_id, user_id_display]
    )
    login_id_input.submit(start_chat, inputs=[login_id_input], outputs=[login_view, chat_view, login_msg]).then(
        lambda id_val: (id_val, id_val), inputs=[login_id_input], outputs=[user_id, user_id_display]
    )
    msg_input.submit(chat, [msg_input, chatbot, session_id, user_id], [msg_input, chatbot])
    submit_btn.click(chat, [msg_input, chatbot, session_id, user_id], [msg_input, chatbot])
    topic_change_btn.click(change_topic, [chatbot, session_id, user_id], [chatbot])
    export_txt_btn.click(export_chat_txt, inputs=[session_id], outputs=[download_file])
    export_md_btn.click(export_chat_md, inputs=[session_id], outputs=[download_file])

# --- 6. ์•ฑ ์‹คํ–‰ ---
app_password = os.environ.get("APP_PASSWORD")

if __name__ == "__main__":
    launch_kwargs = {
        "server_name": "0.0.0.0", 
        "server_port": 7860,
        "ssr_mode": False
    }
    if app_password:
        launch_kwargs["auth"] = ("team", app_password)

    print(f"๐Ÿš€ Launching Gradio with settings: {launch_kwargs}")
    demo.launch(**launch_kwargs)