Create backup2.app.py

backup2.app.py

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+import streamlit as st
+import asyncio
+import websockets
+import uuid
+from datetime import datetime
+import os
+import random
+import time
+import hashlib
+import glob
+import base64
+import io
+import streamlit.components.v1 as components
+import edge_tts
+import nest_asyncio
+import re
+import pytz
+import shutil
+from PyPDF2 import PdfReader
+import threading
+import json
+import zipfile
+from dotenv import load_dotenv
+from streamlit_marquee import streamlit_marquee # Keep import if used
+from collections import defaultdict, Counter
+import pandas as pd # Keep for potential fallback logic if needed
+from streamlit_js_eval import streamlit_js_eval
+from PIL import Image # Needed for paste_image_component
+
+# ==============================================================================
+# Configuration & Constants
+# ==============================================================================
+
+# 🛠️ Patch asyncio for nesting
+nest_asyncio.apply()
+
+# 🎨 Page Config
+st.set_page_config(
+    page_title="🤖🏗️ Shared World Builder 🏆",
+    page_icon="🏗️",
+    layout="wide",
+    initial_sidebar_state="expanded"
+)
+
+# General Constants
+icons = '🤖🏗️🗣️💾'
+Site_Name = '🤖🏗️ Shared World Builder 🗣️'
+START_ROOM = "World Lobby 🌍"
+MEDIA_DIR = "." # Base directory for general files
+STATE_FILE = "user_state.txt" # For remembering username
+
+# User/Chat Constants
+FUN_USERNAMES = {
+    "BuilderBot 🤖": "en-US-AriaNeural", "WorldWeaver 🕸️": "en-US-JennyNeural",
+    "Terraformer 🌱": "en-GB-SoniaNeural", "SkyArchitect ☁️": "en-AU-NatashaNeural",
+    "PixelPainter 🎨": "en-CA-ClaraNeural", "VoxelVortex 🌪️": "en-US-GuyNeural",
+    "CosmicCrafter ✨": "en-GB-RyanNeural", "GeoGuru 🗺️": "en-AU-WilliamNeural",
+    "BlockBard 🧱": "en-CA-LiamNeural", "SoundSculptor 🔊": "en-US-AnaNeural",
+}
+EDGE_TTS_VOICES = list(set(FUN_USERNAMES.values()))
+CHAT_DIR = "chat_logs"
+
+# Audio Constants
+AUDIO_CACHE_DIR = "audio_cache"
+AUDIO_DIR = "audio_logs"
+
+# World Builder Constants
+SAVED_WORLDS_DIR = "saved_worlds" # Directory for MD world files
+PLOT_WIDTH = 50.0 # Needed for JS injection
+PLOT_DEPTH = 50.0 # Needed for JS injection
+WORLD_STATE_FILE_MD_PREFIX = "🌍_" # Prefix for world save files
+
+# File Emojis
+FILE_EMOJIS = {"md": "📝", "mp3": "🎵", "png": "🖼️", "mp4": "🎥", "zip": "📦", "json": "📄"}
+
+# --- Mapping Emojis to Primitive Types ---
+# Ensure these types match the createPrimitiveMesh function keys in index.html
+PRIMITIVE_MAP = {
+    "🌳": "Tree", "🗿": "Rock", "🏛️": "Simple House", "🌲": "Pine Tree", "🧱": "Brick Wall",
+    "🔵": "Sphere", "📦": "Cube", "🧴": "Cylinder", "🍦": "Cone", "🍩": "Torus",
+    "🍄": "Mushroom", "🌵": "Cactus", "🔥": "Campfire", "⭐": "Star", "💎": "Gem",
+    "🗼": "Tower", "🚧": "Barrier", "⛲": "Fountain", "🏮": "Lantern", "팻": "Sign Post"
+    # Add more pairs up to ~20 if desired
+}
+
+# --- Directories ---
+for d in [CHAT_DIR, AUDIO_DIR, AUDIO_CACHE_DIR, SAVED_WORLDS_DIR]:
+    os.makedirs(d, exist_ok=True)
+
+# --- API Keys (Placeholder) ---
+load_dotenv()
+# ANTHROPIC_KEY = os.getenv('ANTHROPIC_API_KEY', st.secrets.get('ANTHROPIC_API_KEY', ""))
+# OPENAI_KEY = os.getenv('OPENAI_API_KEY', st.secrets.get('OPENAI_API_KEY', ""))
+
+# --- Global State & Locks ---
+world_objects_lock = threading.Lock()
+world_objects = defaultdict(dict) # In-memory world state {obj_id: data}
+connected_clients = set() # Holds client_id strings
+
+# ==============================================================================
+# Utility Functions
+# ==============================================================================
+
+def get_current_time_str(tz='UTC'):
+    """Gets formatted timestamp string in specified timezone (default UTC)."""
+    try:
+        timezone = pytz.timezone(tz)
+        now_aware = datetime.now(timezone)
+    except pytz.UnknownTimeZoneError:
+        now_aware = datetime.now(pytz.utc)
+    except Exception as e:
+         print(f"Timezone error ({tz}), using UTC. Error: {e}")
+         now_aware = datetime.now(pytz.utc)
+    return now_aware.strftime('%Y%m%d_%H%M%S')
+
+
+def clean_filename_part(text, max_len=30):
+    """Cleans a string part for use in a filename."""
+    if not isinstance(text, str): text = "invalid_name"
+    text = re.sub(r'\s+', '_', text) # Replace spaces
+    text = re.sub(r'[^\w\-.]', '', text) # Keep word chars, hyphen, period
+    return text[:max_len]
+
+def run_async(async_func, *args, **kwargs):
+    """Runs an async function safely from a sync context using create_task."""
+    try:
+        loop = asyncio.get_running_loop()
+        return loop.create_task(async_func(*args, **kwargs))
+    except RuntimeError: # No running loop in this thread
+        print(f"Warning: Running async func {async_func.__name__} in new event loop.")
+        try:
+            return asyncio.run(async_func(*args, **kwargs))
+        except Exception as e:
+            print(f"Error running async func {async_func.__name__} in new loop: {e}")
+            return None
+    except Exception as e:
+        print(f"Error scheduling async task {async_func.__name__}: {e}")
+        return None
+
+def ensure_dir(dir_path):
+     """Creates directory if it doesn't exist."""
+     os.makedirs(dir_path, exist_ok=True)
+
+# Ensure directories exist on startup
+for d in [CHAT_DIR, AUDIO_DIR, AUDIO_CACHE_DIR, SAVED_WORLDS_DIR]:
+    ensure_dir(d)
+
+# ==============================================================================
+# World State File Handling (Markdown + JSON)
+# ==============================================================================
+
+def generate_world_save_filename(name="World"):
+    """Generates a filename for saving world state MD files."""
+    timestamp = get_current_time_str() # Use UTC for consistency
+    clean_name = clean_filename_part(name)
+    rand_hash = hashlib.md5(str(time.time()).encode() + name.encode()).hexdigest()[:6] # Seed hash
+    return f"{WORLD_STATE_FILE_MD_PREFIX}{clean_name}_{timestamp}_{rand_hash}.md"
+
+def parse_world_filename(filename):
+    """Extracts info from filename if possible, otherwise returns defaults."""
+    basename = os.path.basename(filename)
+    # Check prefix and suffix
+    if basename.startswith(WORLD_STATE_FILE_MD_PREFIX) and basename.endswith(".md"):
+        core_name = basename[len(WORLD_STATE_FILE_MD_PREFIX):-3]
+        parts = core_name.split('_')
+        if len(parts) >= 3: # Expecting Name_Timestamp_Hash
+            timestamp_str = parts[-2]
+            name_parts = parts[:-2]; name = "_".join(name_parts) if name_parts else "Untitled"
+            dt_obj = None
+            try: # Try parsing timestamp
+                dt_obj = datetime.strptime(timestamp_str, '%Y%m%d_%H%M%S')
+                dt_obj = pytz.utc.localize(dt_obj) # Assume UTC
+            except (ValueError, pytz.exceptions.AmbiguousTimeError, pytz.exceptions.NonExistentTimeError): dt_obj = None
+            return {"name": name.replace('_', ' '), "timestamp": timestamp_str, "dt": dt_obj, "filename": filename}
+
+    # Fallback for unknown format
+    dt_fallback = None
+    try: mtime = os.path.getmtime(filename); dt_fallback = datetime.fromtimestamp(mtime, tz=pytz.utc)
+    except Exception: pass
+    return {"name": basename.replace('.md',''), "timestamp": "Unknown", "dt": dt_fallback, "filename": filename}
+
+
+def save_world_state_to_md(target_filename_base):
+    """Saves the current in-memory world state to a specific MD file (basename)."""
+    global world_objects
+    save_path = os.path.join(SAVED_WORLDS_DIR, target_filename_base)
+    print(f"Acquiring lock to save world state to: {save_path}...")
+    success = False
+    with world_objects_lock:
+        world_data_dict = dict(world_objects) # Convert defaultdict for saving
+        print(f"Saving {len(world_data_dict)} objects...")
+        parsed_info = parse_world_filename(save_path) # Parse the full path/intended name
+        timestamp_save = get_current_time_str()
+        md_content = f"""# World State: {parsed_info['name']}
+* **File Saved:** {timestamp_save} (UTC)
+* **Source Timestamp:** {parsed_info['timestamp']}
+* **Objects:** {len(world_data_dict)}
+
+```json
+{json.dumps(world_data_dict, indent=2)}
+```"""
+        try:
+            ensure_dir(SAVED_WORLDS_DIR)
+            with open(save_path, 'w', encoding='utf-8') as f: f.write(md_content)
+            print(f"World state saved successfully to {target_filename_base}")
+            success = True
+        except Exception as e:
+            print(f"Error saving world state to {save_path}: {e}")
+    return success
+
+
+def load_world_state_from_md(filename_base):
+    """Loads world state from an MD file (basename), updates global state, returns success bool."""
+    global world_objects
+    load_path = os.path.join(SAVED_WORLDS_DIR, filename_base)
+    print(f"Loading world state from MD file: {load_path}...")
+    if not os.path.exists(load_path): st.error(f"World file not found: {filename_base}"); return False
+
+    try:
+        with open(load_path, 'r', encoding='utf-8') as f: content = f.read()
+        json_match = re.search(r"```json\s*(\{[\s\S]*?\})\s*```", content, re.IGNORECASE) # More robust regex
+        if not json_match: st.error(f"Could not find valid JSON block in {filename_base}"); return False
+
+        world_data_dict = json.loads(json_match.group(1))
+
+        print(f"Acquiring lock to update world state from {filename_base}...")
+        with world_objects_lock:
+             world_objects.clear()
+             for k, v in world_data_dict.items(): world_objects[str(k)] = v
+             loaded_count = len(world_objects)
+        print(f"Loaded {loaded_count} objects from {filename_base}. Lock released.")
+        st.session_state.current_world_file = filename_base # Track loaded file (basename)
+        return True
+
+    except json.JSONDecodeError as e: st.error(f"Invalid JSON found in {filename_base}: {e}"); return False
+    except Exception as e: st.error(f"Error loading world state from {filename_base}: {e}"); st.exception(e); return False
+
+def get_saved_worlds():
+    """Scans the saved worlds directory for world MD files and parses them."""
+    try:
+        ensure_dir(SAVED_WORLDS_DIR)
+        world_files = glob.glob(os.path.join(SAVED_WORLDS_DIR, f"{WORLD_STATE_FILE_MD_PREFIX}*.md"))
+        parsed_worlds = [parse_world_filename(f) for f in world_files]
+        parsed_worlds.sort(key=lambda x: x['dt'] if x['dt'] else datetime.min.replace(tzinfo=pytz.utc), reverse=True)
+        return parsed_worlds
+    except Exception as e:
+         print(f"Error scanning saved worlds: {e}"); st.error(f"Could not scan saved worlds: {e}"); return []
+
+# ==============================================================================
+# User State & Session Init
+# ==============================================================================
+
+def save_username(username):
+    try:
+        with open(STATE_FILE, 'w') as f: f.write(username)
+    except Exception as e: print(f"Failed save username: {e}")
+
+def load_username():
+    if os.path.exists(STATE_FILE):
+        try:
+            with open(STATE_FILE, 'r') as f: return f.read().strip()
+        except Exception as e: print(f"Failed load username: {e}")
+    return None
+
+def init_session_state():
+    """Initializes Streamlit session state variables."""
+    defaults = {
+        'server_running_flag': False, 'server_instance': None, 'server_task': None,
+        'active_connections': defaultdict(dict), 'last_chat_update': 0, 'message_input': "",
+        'audio_cache': {}, 'tts_voice': "en-US-AriaNeural", 'chat_history': [],
+        'marquee_settings': {"background": "#1E1E1E", "color": "#FFFFFF", "font-size": "14px", "animationDuration": "20s", "width": "100%", "lineHeight": "35px"},
+        'enable_audio': True, 'download_link_cache': {}, 'username': None, 'autosend': False,
+        'last_message': "", 'timer_start': time.time(), 'last_sent_transcript': "",
+        'last_refresh': time.time(), 'auto_refresh': False, 'refresh_rate': 30,
+        'selected_object': 'None', 'initial_world_state_loaded': False,
+        'current_world_file': None, # Track loaded world filename (basename)
+        'operation_timings': {}, 'performance_metrics': defaultdict(list),
+        'paste_image_base64': "", 'new_world_name': "MyWorld"
+    }
+    for k, v in defaults.items():
+        if k not in st.session_state: st.session_state[k] = v
+    # Ensure complex types initialized correctly
+    if not isinstance(st.session_state.active_connections, defaultdict): st.session_state.active_connections = defaultdict(dict)
+    if not isinstance(st.session_state.chat_history, list): st.session_state.chat_history = []
+    if not isinstance(st.session_state.marquee_settings, dict): st.session_state.marquee_settings = defaults['marquee_settings']
+    if not isinstance(st.session_state.audio_cache, dict): st.session_state.audio_cache = {}
+    if not isinstance(st.session_state.download_link_cache, dict): st.session_state.download_link_cache = {}
+
+# ==============================================================================
+# Audio / TTS / Chat / File Handling Helpers
+# ==============================================================================
+
+# --- Text & File Helpers ---
+def clean_text_for_tts(text):
+    if not isinstance(text, str): return "No text"
+    text = re.sub(r'\[([^\]]+)\]\([^\)]+\)', r'\1', text); text = re.sub(r'[#*_`!]', '', text)
+    text = ' '.join(text.split()); return text[:250] or "No text"
+
+def create_file(content, username, file_type="md", save_path=None):
+    if not save_path: filename = generate_filename(content, username, file_type); save_path = os.path.join(MEDIA_DIR, filename)
+    ensure_dir(os.path.dirname(save_path))
+    try:
+        with open(save_path, 'w', encoding='utf-8') as f: f.write(content)
+        # print(f"Created file: {save_path}"); # Can be too verbose
+        return save_path
+    except Exception as e: print(f"Error creating file {save_path}: {e}"); return None
+
+def get_download_link(file_path, file_type="md"):
+    if not file_path or not os.path.exists(file_path): basename = os.path.basename(file_path) if file_path else "N/A"; return f"<small>Not found: {basename}</small>"
+    try: mtime = os.path.getmtime(file_path)
+    except OSError: mtime = 0
+    cache_key = f"dl_{file_path}_{mtime}";
+    if 'download_link_cache' not in st.session_state: st.session_state.download_link_cache = {}
+    if cache_key not in st.session_state.download_link_cache:
+        try:
+            with open(file_path, "rb") as f: b64 = base64.b64encode(f.read()).decode()
+            mime_types = {"md": "text/markdown", "mp3": "audio/mpeg", "png": "image/png", "mp4": "video/mp4", "zip": "application/zip", "json": "application/json"}
+            basename = os.path.basename(file_path)
+            link_html = f'<a href="data:{mime_types.get(file_type, "application/octet-stream")};base64,{b64}" download="{basename}" title="Download {basename}">{FILE_EMOJIS.get(file_type, "📄")}</a>'
+            st.session_state.download_link_cache[cache_key] = link_html
+        except Exception as e: print(f"Error generating DL link for {file_path}: {e}"); return f"<small>Err</small>"
+    return st.session_state.download_link_cache.get(cache_key, "<small>CacheErr</small>")
+
+# --- Audio / TTS ---
+async def async_edge_tts_generate(text, voice, username):
+    if not text: return None
+    cache_key = hashlib.md5(f"{text[:150]}_{voice}".encode()).hexdigest();
+    if 'audio_cache' not in st.session_state: st.session_state.audio_cache = {}
+    cached_path = st.session_state.audio_cache.get(cache_key);
+    if cached_path and os.path.exists(cached_path): return cached_path
+    text_cleaned = clean_text_for_tts(text);
+    if not text_cleaned or text_cleaned == "No text": return None
+    filename_base = generate_filename(text_cleaned, username, "mp3"); save_path = os.path.join(AUDIO_DIR, filename_base);
+    ensure_dir(AUDIO_DIR)
+    try:
+        communicate = edge_tts.Communicate(text_cleaned, voice); await communicate.save(save_path);
+        if os.path.exists(save_path) and os.path.getsize(save_path) > 0: st.session_state.audio_cache[cache_key] = save_path; return save_path
+        else: print(f"Audio file {save_path} failed generation."); return None
+    except Exception as e: print(f"Edge TTS Error: {e}"); return None
+
+def play_and_download_audio(file_path):
+    if file_path and os.path.exists(file_path):
+        try:
+             st.audio(file_path)
+             file_type = file_path.split('.')[-1]
+             st.markdown(get_download_link(file_path, file_type), unsafe_allow_html=True)
+        except Exception as e: st.error(f"Audio display error for {os.path.basename(file_path)}: {e}")
+
+# --- Chat ---
+async def save_chat_entry(username, message, voice, is_markdown=False):
+    if not message.strip(): return None, None
+    timestamp_str = get_current_time_str();
+    entry = f"[{timestamp_str}] {username} ({voice}): {message}" if not is_markdown else f"[{timestamp_str}] {username} ({voice}):\n```markdown\n{message}\n```"
+    md_filename_base = generate_filename(message, username, "md"); md_file_path = os.path.join(CHAT_DIR, md_filename_base);
+    md_file = create_file(entry, username, "md", save_path=md_file_path) # Save to file
+    if 'chat_history' not in st.session_state: st.session_state.chat_history = [];
+    st.session_state.chat_history.append(entry) # Add to live history
+    audio_file = None;
+    if st.session_state.get('enable_audio', True):
+         tts_message = message # Use original message for TTS
+         audio_file = await async_edge_tts_generate(tts_message, voice, username)
+    return md_file, audio_file
+
+async def load_chat_history():
+    if 'chat_history' not in st.session_state: st.session_state.chat_history = []
+    if not st.session_state.chat_history: # Only load from files if session state is empty
+        ensure_dir(CHAT_DIR)
+        print("Loading chat history from files...")
+        chat_files = sorted(glob.glob(os.path.join(CHAT_DIR, "*.md")), key=os.path.getmtime); loaded_count = 0
+        temp_history = []
+        for f_path in chat_files:
+             try:
+                  with open(f_path, 'r', encoding='utf-8') as file: temp_history.append(file.read().strip()); loaded_count += 1
+             except Exception as e: print(f"Err read chat {f_path}: {e}")
+        st.session_state.chat_history = temp_history # Assign loaded history
+        print(f"Loaded {loaded_count} chat entries from files.")
+    return st.session_state.chat_history
+
+# --- File Management ---
+def create_zip_of_files(files_to_zip, prefix="Archive"):
+    if not files_to_zip: st.warning("No files provided to zip."); return None
+    timestamp = format_timestamp_prefix(f"Zip_{prefix}"); zip_name = f"{prefix}_{timestamp}.zip"
+    try:
+        print(f"Creating zip: {zip_name}...");
+        with zipfile.ZipFile(zip_name, 'w', zipfile.ZIP_DEFLATED) as z:
+            for f in files_to_zip:
+                 if os.path.exists(f): z.write(f, os.path.basename(f)) # Use basename in archive
+                 else: print(f"Skip zip missing: {f}")
+        print("Zip success."); st.success(f"Created {zip_name}"); return zip_name
+    except Exception as e: print(f"Zip failed: {e}"); st.error(f"Zip failed: {e}"); return None
+
+def delete_files(file_patterns, exclude_files=None):
+    """Deletes files matching patterns, excluding protected/specified files."""
+    protected = [STATE_FILE, "app.py", "index.html", "requirements.txt", "README.md"]
+    # Don't automatically protect current world file during generic delete
+    if exclude_files: protected.extend(exclude_files)
+
+    deleted_count = 0; errors = 0
+    for pattern in file_patterns:
+         pattern_path = pattern # Assume pattern includes path from os.path.join
+         print(f"Attempting to delete files matching: {pattern_path}")
+         try:
+              files_to_delete = glob.glob(pattern_path)
+              if not files_to_delete: print(f"No files found for pattern: {pattern}"); continue
+              for f_path in files_to_delete:
+                   basename = os.path.basename(f_path)
+                   if os.path.isfile(f_path) and basename not in protected:
+                        try: os.remove(f_path); print(f"Deleted: {f_path}"); deleted_count += 1
+                        except Exception as e: print(f"Failed delete {f_path}: {e}"); errors += 1
+                   elif os.path.isdir(f_path): print(f"Skipping directory: {f_path}")
+         except Exception as glob_e: print(f"Error matching pattern {pattern}: {glob_e}"); errors += 1
+    msg = f"Deleted {deleted_count} files.";
+    if errors > 0: msg += f" Encountered {errors} errors."; st.warning(msg)
+    elif deleted_count > 0: st.success(msg)
+    else: st.info("No matching files found to delete.")
+    st.session_state['download_link_cache'] = {}; st.session_state['audio_cache'] = {}
+
+
+# --- Image Handling ---
+async def save_pasted_image(image, username):
+     if not image: return None
+     try:
+          img_hash = hashlib.md5(image.tobytes()).hexdigest()[:8]; timestamp = format_timestamp_prefix(username); filename = f"{timestamp}_pasted_{img_hash}.png"; filepath = os.path.join(MEDIA_DIR, filename)
+          image.save(filepath, "PNG"); print(f"Pasted image saved: {filepath}"); return filepath
+     except Exception as e: print(f"Failed image save: {e}"); return None
+
+def paste_image_component():
+      pasted_img = None; img_type = None
+      # Added default value to text_area to ensure key exists even if empty
+      paste_input = st.text_area("Paste Image Data Here", key="paste_input_area", height=50, value="")
+      if st.button("Process Pasted Image 📋", key="paste_form_button"): # Simplified trigger
+           if paste_input and paste_input.startswith('data:image'):
+               try:
+                   mime_type = paste_input.split(';')[0].split(':')[1]; base64_str = paste_input.split(',')[1]; img_bytes = base64.b64decode(base64_str); pasted_img = Image.open(io.BytesIO(img_bytes)); img_type = mime_type.split('/')[1]
+                   st.image(pasted_img, caption=f"Pasted ({img_type.upper()})", width=150); st.session_state.paste_image_base64 = base64_str
+               except ImportError: st.error("Pillow library needed for image pasting.")
+               except Exception as e: st.error(f"Img decode err: {e}"); st.session_state.paste_image_base64 = ""
+           else: st.warning("No valid image data pasted."); st.session_state.paste_image_base64 = ""
+      # Return image if processed successfully in this run
+      return pasted_img
+
+
+# --- PDF Processing ---
+class AudioProcessor:
+      def __init__(self): self.cache_dir=AUDIO_CACHE_DIR; ensure_dir(self.cache_dir); self.metadata=json.load(open(f"{self.cache_dir}/metadata.json", 'r')) if os.path.exists(f"{self.cache_dir}/metadata.json") else {}
+      def _save_metadata(self):
+            try:
+                 with open(f"{self.cache_dir}/metadata.json", 'w') as f: json.dump(self.metadata, f, indent=2)
+            except Exception as e: print(f"Failed metadata save: {e}")
+      async def create_audio(self, text, voice='en-US-AriaNeural'):
+            cache_key=hashlib.md5(f"{text[:150]}:{voice}".encode()).hexdigest(); cache_path=os.path.join(self.cache_dir, f"{cache_key}.mp3");
+            if cache_key in self.metadata and os.path.exists(cache_path): return cache_path
+            text_cleaned=clean_text_for_tts(text);
+            if not text_cleaned: return None
+            ensure_dir(os.path.dirname(cache_path))
+            try:
+                 communicate=edge_tts.Communicate(text_cleaned,voice); await communicate.save(cache_path)
+                 if os.path.exists(cache_path) and os.path.getsize(cache_path) > 0: self.metadata[cache_key]={'timestamp': datetime.now().isoformat(), 'text_length': len(text_cleaned), 'voice': voice}; self._save_metadata(); return cache_path
+                 else: return None
+            except Exception as e: print(f"TTS Create Audio Error: {e}"); return None
+
+def process_pdf_tab(pdf_file, max_pages, voice):
+    st.subheader("PDF Processing Results") # Change header
+    if pdf_file is None: st.info("Upload a PDF file and click 'Process PDF' to begin."); return
+    audio_processor = AudioProcessor()
+    try:
+        reader=PdfReader(pdf_file)
+        if reader.is_encrypted: st.warning("PDF is encrypted."); return
+        total_pages=min(len(reader.pages),max_pages);
+        st.write(f"Processing first {total_pages} pages of '{pdf_file.name}'...")
+        texts, audios={}, {}; page_threads = []; results_lock = threading.Lock()
+
+        def process_page_sync(page_num, page_text):
+            async def run_async_audio(): return await audio_processor.create_audio(page_text, voice)
+            try:
+                # asyncio.run can cause issues if called repeatedly in threads, use run_async helper
+                audio_path_future = run_async(run_async_audio)
+                # This needs careful handling. run_async might return a task or result.
+                # For simplicity here, let's assume it blocks or we retrieve result later.
+                # A better pattern uses concurrent.futures or manages event loop properly.
+                # Sticking to asyncio.run for now as run_async tries it.
+                audio_path = asyncio.run(run_async_audio()) # Revert to simpler asyncio.run for thread context
+                if audio_path:
+                     with results_lock: audios[page_num] = audio_path
+            except Exception as page_e: print(f"Err process page {page_num+1}: {page_e}")
+
+        # Start threads
+        for i in range(total_pages):
+             try:
+                 page = reader.pages[i]; text = page.extract_text();
+                 if text and text.strip(): texts[i]=text; thread = threading.Thread(target=process_page_sync, args=(i, text)); page_threads.append(thread); thread.start()
+                 else: texts[i] = "[No text extracted]"
+             except Exception as extract_e: texts[i] = f"[Error extract: {extract_e}]"; print(f"Error page {i+1} extract: {extract_e}")
+
+        # Wait for threads and display progress
+        progress_bar = st.progress(0.0, text="Processing pages...")
+        total_threads = len(page_threads)
+        start_join_time = time.time()
+        while any(t.is_alive() for t in page_threads):
+            completed_threads = total_threads - sum(t.is_alive() for t in page_threads)
+            progress = completed_threads / total_threads if total_threads > 0 else 1.0
+            progress_bar.progress(min(progress, 1.0), text=f"Processed {completed_threads}/{total_threads} pages...")
+            if time.time() - start_join_time > 600: print("PDF processing timed out."); break # 10 min timeout
+            time.sleep(0.5)
+        progress_bar.progress(1.0, text="Processing complete.")
+
+        # Display results
+        for i in range(total_pages):
+              with st.expander(f"Page {i+1}"):
+                   st.markdown(texts.get(i, "[Error getting text]"))
+                   audio_file = audios.get(i)
+                   if audio_file: play_and_download_audio(audio_file)
+                   else: st.caption("Audio generation failed or was skipped.")
+
+    except Exception as pdf_e: st.error(f"Err read PDF: {pdf_e}"); st.exception(pdf_e)
+
+# ==============================================================================
+# WebSocket Server Logic
+# ==============================================================================
+
+async def register_client(websocket):
+    client_id = str(websocket.id); connected_clients.add(client_id);
+    if 'active_connections' not in st.session_state: st.session_state.active_connections = defaultdict(dict);
+    st.session_state.active_connections[client_id] = websocket; print(f"Client registered: {client_id}. Total: {len(connected_clients)}")
+
+async def unregister_client(websocket):
+    client_id = str(websocket.id); connected_clients.discard(client_id);
+    if 'active_connections' in st.session_state: st.session_state.active_connections.pop(client_id, None);
+    print(f"Client unregistered: {client_id}. Remaining: {len(connected_clients)}")
+
+async def send_safely(websocket, message, client_id):
+     try: await websocket.send(message)
+     except websockets.ConnectionClosed: print(f"WS Send failed (Closed) client {client_id}"); raise
+     except RuntimeError as e: print(f"WS Send failed (Runtime {e}) client {client_id}"); raise
+     except Exception as e: print(f"WS Send failed (Other {e}) client {client_id}"); raise
+
+async def broadcast_message(message, exclude_id=None):
+    if not connected_clients: return
+    tasks = []; current_client_ids = list(connected_clients); active_connections_copy = st.session_state.active_connections.copy()
+    for client_id in current_client_ids:
+        if client_id == exclude_id: continue
+        websocket = active_connections_copy.get(client_id)
+        if websocket: tasks.append(asyncio.create_task(send_safely(websocket, message, client_id)))
+    if tasks: await asyncio.gather(*tasks, return_exceptions=True)
+
+async def broadcast_world_update():
+    with world_objects_lock: current_state_payload = dict(world_objects)
+    update_msg = json.dumps({"type": "initial_state", "payload": current_state_payload})
+    print(f"Broadcasting full world update ({len(current_state_payload)} objects)...")
+    await broadcast_message(update_msg)
+
+async def websocket_handler(websocket, path):
+    await register_client(websocket); client_id = str(websocket.id);
+    username = st.session_state.get('username', f"User_{client_id[:4]}")
+    try: # Send initial state
+        with world_objects_lock: initial_state_payload = dict(world_objects)
+        initial_state_msg = json.dumps({"type": "initial_state", "payload": initial_state_payload}); await websocket.send(initial_state_msg)
+        print(f"Sent initial state ({len(initial_state_payload)} objs) to {client_id}")
+        await broadcast_message(json.dumps({"type": "user_join", "payload": {"username": username, "id": client_id}}), exclude_id=client_id)
+    except Exception as e: print(f"Error initial phase {client_id}: {e}")
+
+    try: # Message loop
+        async for message in websocket:
+            try:
+                data = json.loads(message); msg_type = data.get("type"); payload = data.get("payload", {});
+                sender_username = payload.get("username", username)
+
+                if msg_type == "chat_message":
+                    chat_text = payload.get('message', ''); voice = payload.get('voice', FUN_USERNAMES.get(sender_username, "en-US-AriaNeural"));
+                    run_async(save_chat_entry, sender_username, chat_text, voice)
+                    await broadcast_message(message, exclude_id=client_id)
+
+                elif msg_type == "place_object":
+                    obj_data = payload.get("object_data");
+                    if obj_data and 'obj_id' in obj_data and 'type' in obj_data:
+                        with world_objects_lock: world_objects[obj_data['obj_id']] = obj_data
+                        broadcast_payload = json.dumps({"type": "object_placed", "payload": {"object_data": obj_data, "username": sender_username}});
+                        await broadcast_message(broadcast_payload, exclude_id=client_id)
+                    else: print(f"WS Invalid place_object payload: {payload}")
+
+                elif msg_type == "delete_object":
+                     obj_id = payload.get("obj_id"); removed = False
+                     if obj_id:
+                          with world_objects_lock:
+                              if obj_id in world_objects: del world_objects[obj_id]; removed = True
+                          if removed:
+                               broadcast_payload = json.dumps({"type": "object_deleted", "payload": {"obj_id": obj_id, "username": sender_username}});
+                               await broadcast_message(broadcast_payload, exclude_id=client_id)
+                     else: print(f"WS Invalid delete_object payload: {payload}")
+
+                elif msg_type == "player_position":
+                     pos_data = payload.get("position"); rot_data = payload.get("rotation")
+                     if pos_data:
+                          broadcast_payload = json.dumps({"type": "player_moved", "payload": {"username": sender_username, "id": client_id, "position": pos_data, "rotation": rot_data}});
+                          await broadcast_message(broadcast_payload, exclude_id=client_id)
+
+            except json.JSONDecodeError: print(f"WS Invalid JSON from {client_id}: {message[:100]}...")
+            except Exception as e: print(f"WS Error processing msg from {client_id}: {e}")
+    except websockets.ConnectionClosed: print(f"WS Client disconnected: {client_id} ({username})")
+    except Exception as e: print(f"WS Unexpected handler error {client_id}: {e}")
+    finally:
+         await broadcast_message(json.dumps({"type": "user_leave", "payload": {"username": username, "id": client_id}}), exclude_id=client_id);
+         await unregister_client(websocket)
+
+
+async def run_websocket_server():
+    if st.session_state.get('server_running_flag', False): return
+    st.session_state['server_running_flag'] = True; print("Attempting start WS server 0.0.0.0:8765...")
+    stop_event = asyncio.Event(); st.session_state['websocket_stop_event'] = stop_event
+    server = None
+    try:
+        server = await websockets.serve(websocket_handler, "0.0.0.0", 8765); st.session_state['server_instance'] = server
+        print(f"WS server started: {server.sockets[0].getsockname()}. Waiting for stop signal...")
+        await stop_event.wait()
+    except OSError as e: print(f"### FAILED START WS SERVER: {e}"); st.session_state['server_running_flag'] = False;
+    except Exception as e: print(f"### UNEXPECTED WS SERVER ERROR: {e}"); st.session_state['server_running_flag'] = False;
+    finally:
+        print("WS server task finishing...");
+        if server: server.close(); await server.wait_closed(); print("WS server closed.")
+        st.session_state['server_running_flag'] = False; st.session_state['server_instance'] = None; st.session_state['websocket_stop_event'] = None
+
+def start_websocket_server_thread():
+    if st.session_state.get('server_task') and st.session_state.server_task.is_alive(): return
+    if st.session_state.get('server_running_flag', False): return
+    print("Creating/starting new server thread.");
+    def run_loop():
+        loop = None
+        try: loop = asyncio.get_running_loop()
+        except RuntimeError: loop = asyncio.new_event_loop(); asyncio.set_event_loop(loop)
+        try: loop.run_until_complete(run_websocket_server())
+        finally:
+             if loop and not loop.is_closed():
+                tasks = asyncio.all_tasks(loop);
+                for task in tasks: task.cancel()
+                try: loop.run_until_complete(asyncio.gather(*tasks, return_exceptions=True))
+                except asyncio.CancelledError: pass
+                finally: loop.close(); print("Server thread loop closed.")
+             else: print("Server thread loop already closed or None.")
+    st.session_state.server_task = threading.Thread(target=run_loop, daemon=True); st.session_state.server_task.start(); time.sleep(1.5)
+    if not st.session_state.server_task.is_alive(): print("### Server thread failed to stay alive!")
+
+
+# ==============================================================================
+# Streamlit UI Layout Functions
+# ==============================================================================
+
+def render_sidebar():
+    """Renders the Streamlit sidebar contents."""
+    with st.sidebar:
+        st.header("💾 World Versions")
+        st.caption("Load or save named world states.")
+
+        saved_worlds = get_saved_worlds()
+        world_options_display = {os.path.basename(w['filename']): f"{w['name']} ({w['timestamp']})" for w in saved_worlds}
+        radio_options_basenames = [None] + [os.path.basename(w['filename']) for w in saved_worlds]
+        current_selection_basename = st.session_state.get('current_world_file', None)
+        current_radio_index = 0
+        if current_selection_basename and current_selection_basename in radio_options_basenames:
+             try: current_radio_index = radio_options_basenames.index(current_selection_basename)
+             except ValueError: current_radio_index = 0
+
+        selected_basename = st.radio(
+             "Load World:", options=radio_options_basenames, index=current_radio_index,
+             format_func=lambda x: "Live State (Unsaved)" if x is None else world_options_display.get(x, x),
+             key="world_selector_radio"
+         )
+
+        if selected_basename != current_selection_basename:
+             st.session_state.current_world_file = selected_basename
+             if selected_basename:
+                  with st.spinner(f"Loading {selected_basename}..."):
+                      if load_world_state_from_md(selected_basename):
+                          run_async(broadcast_world_update)
+                          st.toast("World loaded!", icon="✅")
+                      else: st.error("Failed to load world."); st.session_state.current_world_file = None
+             else:
+                  print("Switched to live state."); st.toast("Switched to Live State.")
+             st.rerun()
+
+        st.caption("Download:")
+        cols = st.columns([4, 1])
+        with cols[0]: st.write("**Name** (Timestamp)")
+        with cols[1]: st.write("**DL**")
+        display_limit = 10
+        for i, world_info in enumerate(saved_worlds):
+            if i >= display_limit and len(saved_worlds) > display_limit + 1: # Show expander after limit
+                 with st.expander(f"Show {len(saved_worlds)-display_limit} more..."):
+                      for world_info_more in saved_worlds[display_limit:]:
+                            f_basename = os.path.basename(world_info_more['filename']); f_fullpath = os.path.join(SAVED_WORLDS_DIR, f_basename); display_name = world_info_more.get('name', f_basename); timestamp = world_info_more.get('timestamp', 'N/A')
+                            colA, colB = st.columns([4, 1]);
+                            with colA: st.write(f"<small>{display_name} ({timestamp})</small>", unsafe_allow_html=True)
+                            with colB: st.markdown(get_download_link(f_fullpath, "md"), unsafe_allow_html=True)
+                 break # Stop outer loop after showing expander
+
+            f_basename = os.path.basename(world_info['filename']); f_fullpath = os.path.join(SAVED_WORLDS_DIR, f_basename); display_name = world_info.get('name', f_basename); timestamp = world_info.get('timestamp', 'N/A')
+            col1, col2 = st.columns([4, 1]);
+            with col1: st.write(f"<small>{display_name} ({timestamp})</small>", unsafe_allow_html=True)
+            with col2: st.markdown(get_download_link(f_fullpath, "md"), unsafe_allow_html=True)
+
+
+        st.markdown("---")
+        st.header("🏗️ Build Tools")
+        st.caption("Select an object to place.")
+        cols = st.columns(5)
+        col_idx = 0
+        current_tool = st.session_state.get('selected_object', 'None')
+        for emoji, name in PRIMITIVE_MAP.items():
+            button_key = f"primitive_{name}"; button_type = "primary" if current_tool == name else "secondary"
+            if cols[col_idx % 5].button(emoji, key=button_key, help=name, type=button_type, use_container_width=True):
+                if st.session_state.get('selected_object', 'None') != name:
+                    st.session_state.selected_object = name
+                    run_async(lambda name_arg=name: streamlit_js_eval(f"updateSelectedObjectType({json.dumps(name_arg)});", key=f"update_tool_js_{name_arg}"))
+                    st.rerun()
+            col_idx += 1
+        st.markdown("---")
+        if st.button("🚫 Clear Tool", key="clear_tool", use_container_width=True):
+             if st.session_state.get('selected_object', 'None') != 'None':
+                  st.session_state.selected_object = 'None';
+                  run_async(lambda: streamlit_js_eval("updateSelectedObjectType('None');", key="update_tool_js_none"))
+                  st.rerun()
+
+        st.markdown("---")
+        st.header("🗣️ Voice & User")
+        current_username = st.session_state.get('username', list(FUN_USERNAMES.keys())[0])
+        username_options = list(FUN_USERNAMES.keys()); current_index = 0
+        try: current_index = username_options.index(current_username)
+        except ValueError: current_index = 0
+        new_username = st.selectbox("Change Name/Voice", options=username_options, index=current_index, key="username_select", format_func=lambda x: x.split(" ")[0])
+        if new_username != st.session_state.username:
+            old_username = st.session_state.username
+            change_msg = json.dumps({"type":"user_rename", "payload": {"old_username": old_username, "new_username": new_username}})
+            run_async(broadcast_message, change_msg)
+            st.session_state.username = new_username; st.session_state.tts_voice = FUN_USERNAMES[new_username]; save_username(st.session_state.username)
+            st.rerun()
+        st.session_state['enable_audio'] = st.toggle("Enable TTS Audio", value=st.session_state.get('enable_audio', True))
+
+
+def render_main_content():
+    """Renders the main content area with tabs."""
+    st.title(f"{Site_Name} - User: {st.session_state.username}")
+
+    tab_world, tab_chat, tab_pdf, tab_files = st.tabs(["🏗️ World Builder", "🗣️ Chat", "📚 PDF Tools", "📂 Files & Settings"])
+
+    # --- World Builder Tab ---
+    with tab_world:
+        st.header("Shared 3D World")
+        st.caption("Place objects using the sidebar tools. Changes are shared live!")
+        current_file_basename = st.session_state.get('current_world_file', None)
+        if current_file_basename:
+             parsed = parse_world_filename(os.path.join(SAVED_WORLDS_DIR, current_file_basename)); st.info(f"Current World: **{parsed['name']}** (`{current_file_basename}`)")
+        else: st.info("Live State Active (Unsaved changes only persist if saved)")
+
+        # Embed HTML Component
+        html_file_path = 'index.html'
+        try:
+            with open(html_file_path, 'r', encoding='utf-8') as f: html_template = f.read()
+            ws_url = "ws://localhost:8765" # Default
+            try: # Get WS URL (Best effort)
+                 from streamlit.web.server.server import Server
+                 session_info = Server.get_current()._get_session_info(st.runtime.scriptrunner.get_script_run_ctx().session_id)
+                 server_host = session_info.ws.stream.request.host.split(':')[0]
+                 ws_url = f"ws://{server_host}:8765"
+            except Exception as e: print(f"WS URL detection failed ({e}), using localhost.")
+
+            js_injection_script = f"""<script>
+    window.USERNAME = {json.dumps(st.session_state.username)};
+    window.WEBSOCKET_URL = {json.dumps(ws_url)};
+    window.SELECTED_OBJECT_TYPE = {json.dumps(st.session_state.selected_object)};
+    window.PLOT_WIDTH = {json.dumps(PLOT_WIDTH)};
+    window.PLOT_DEPTH = {json.dumps(PLOT_DEPTH)};
+    console.log("Streamlit State Injected:", {{ username: window.USERNAME, websocketUrl: window.WEBSOCKET_URL, selectedObject: window.SELECTED_OBJECT_TYPE }});
+</script>"""
+            html_content_with_state = html_template.replace('</head>', js_injection_script + '\n</head>', 1)
+            components.html(html_content_with_state, height=700, scrolling=False)
+        except FileNotFoundError: st.error(f"CRITICAL ERROR: Could not find '{html_file_path}'.")
+        except Exception as e: st.error(f"Error loading 3D component: {e}"); st.exception(e)
+
+    # --- Chat Tab ---
+    with tab_chat:
+        st.header(f"{START_ROOM} Chat")
+        chat_history_task = run_async(load_chat_history) # Schedule load
+        chat_history = chat_history_task.result() if chat_history_task else st.session_state.chat_history # Get result if task ran sync, else use current state
+        chat_container = st.container(height=500)
+        with chat_container:
+             if chat_history: st.markdown("----\n".join(reversed(chat_history[-50:])))
+             else: st.caption("No chat messages yet.")
+
+        message_value = st.text_input("Your Message:", key="message_input", label_visibility="collapsed")
+        send_button_clicked = st.button("Send Chat 💬", key="send_chat_button")
+        should_autosend = st.session_state.get('autosend', False) and message_value
+
+        if send_button_clicked or should_autosend:
+            message_to_send = message_value
+            if message_to_send.strip() and message_to_send != st.session_state.get('last_message', ''):
+                st.session_state.last_message = message_to_send
+                voice = FUN_USERNAMES.get(st.session_state.username, "en-US-AriaNeural")
+                ws_message = json.dumps({"type": "chat_message", "payload": {"username": st.session_state.username, "message": message_to_send, "voice": voice}})
+                run_async(broadcast_message, ws_message)
+                run_async(save_chat_entry, st.session_state.username, message_to_send, voice)
+                st.session_state.message_input = "" # Clear state for next run
+                st.rerun()
+            elif send_button_clicked: st.toast("Message empty or same as last.")
+        st.checkbox("Autosend Chat", key="autosend")
+
+    # --- PDF Tab ---
+    with tab_pdf:
+         st.header("📚 PDF Tools")
+         pdf_file = st.file_uploader("Upload PDF for Audio Conversion", type="pdf", key="pdf_upload")
+         max_pages = st.slider('Max Pages to Process', 1, 50, 10, key="pdf_pages")
+         if pdf_file:
+              if st.button("Process PDF to Audio", key="process_pdf_button"):
+                   with st.spinner("Processing PDF... This may take time."):
+                        process_pdf_tab(pdf_file, max_pages, st.session_state.tts_voice)
+
+    # --- Files & Settings Tab ---
+    with tab_files:
+        st.header("📂 Files & Settings")
+        st.subheader("💾 World State Management")
+        current_file_basename = st.session_state.get('current_world_file', None)
+
+        if current_file_basename:
+             parsed = parse_world_filename(os.path.join(SAVED_WORLDS_DIR, current_file_basename))
+             save_label = f"Save Changes to '{parsed['name']}'"
+             if st.button(save_label, key="save_current_world", help=f"Overwrite '{current_file_basename}'"):
+                 with st.spinner(f"Overwriting {current_file_basename}..."):
+                     if save_world_state_to_md(current_file_basename): st.success("Current world saved!")
+                     else: st.error("Failed to save world state.")
+        else: 
+             st.info("Load a world from the sidebar to enable saving changes to it.")
+
+        st.subheader("Save As New Version")
+        new_name_files = st.text_input("New World Name:", key="new_world_name_files", value=st.session_state.get('new_world_name', 'MyWorld'))
+        if st.button("💾 Save Live State as New Version", key="save_new_version_files"):
+             if new_name_files.strip():
+                  new_filename_base = generate_world_save_filename(new_name_files)
+                  with st.spinner(f"Saving new version '{new_name_files}'..."):
+                      if save_world_state_to_md(new_filename_base):
+                          st.success(f"Saved as {new_filename_base}")
+                          st.session_state.current_world_file = new_filename_base; st.session_state.new_world_name = "MyWorld"; st.rerun()
+                      else: st.error("Failed to save new version.")
+             else: st.warning("Please enter a name.")
+
+        st.subheader("⚙️ Server Status")
+        col_ws, col_clients = st.columns(2)
+        with col_ws:
+             server_alive = st.session_state.get('server_task') and st.session_state.server_task.is_alive(); ws_status = "Running" if server_alive else "Stopped"; st.metric("WebSocket Server", ws_status)
+             if not server_alive and st.button("Restart Server Thread", key="restart_ws"): start_websocket_server_thread(); st.rerun()
+        with col_clients: st.metric("Connected Clients", len(connected_clients))
+
+        st.subheader("🗑️ Delete Files")
+        st.warning("Deletion is permanent!", icon="⚠️")
+        col_del1, col_del2, col_del3, col_del4 = st.columns(4)
+        with col_del1:
+             if st.button("🗑️ Chats", key="del_chat_md"): delete_files([os.path.join(CHAT_DIR, "*.md")]); st.session_state.chat_history = []; st.rerun()
+        with col_del2:
+            if st.button("🗑️ Audio", key="del_audio_mp3"): delete_files([os.path.join(AUDIO_DIR, "*.mp3"), os.path.join(AUDIO_CACHE_DIR, "*.mp3")]); st.session_state.audio_cache = {}; st.rerun()
+        with col_del3:
+            if st.button("🗑️ Worlds", key="del_worlds_md"): delete_files([os.path.join(SAVED_WORLDS_DIR, f"{WORLD_STATE_FILE_MD_PREFIX}*.md")]); st.session_state.current_world_file = None; st.rerun()
+        with col_del4:
+            if st.button("🗑️ All Gen", key="del_all_gen"): delete_files([os.path.join(CHAT_DIR, "*.md"), os.path.join(AUDIO_DIR, "*.mp3"), os.path.join(AUDIO_CACHE_DIR, "*.mp3"), os.path.join(SAVED_WORLDS_DIR, "*.md"), "*.zip"]); st.session_state.chat_history = []; st.session_state.audio_cache = {}; st.session_state.current_world_file = None; st.rerun()
+
+        st.subheader("📦 Download Archives")
+        zip_files = sorted(glob.glob(os.path.join(MEDIA_DIR,"*.zip")), key=os.path.getmtime, reverse=True)
+        if zip_files:
+             col_zip1, col_zip2, col_zip3 = st.columns(3)
+             with col_zip1:
+                  if st.button("Zip Worlds"): create_zip_of_files([w['filename'] for w in get_saved_worlds()], "Worlds")
+             with col_zip2:
+                   if st.button("Zip Chats"): create_zip_of_files(glob.glob(os.path.join(CHAT_DIR, "*.md")), "Chats")
+             with col_zip3:
+                   if st.button("Zip Audio"): create_zip_of_files(glob.glob(os.path.join(AUDIO_DIR, "*.mp3")) + glob.glob(os.path.join(AUDIO_CACHE_DIR, "*.mp3")), "Audio")
+
+             st.caption("Existing Zip Files:")
+             for zip_file in zip_files: st.markdown(get_download_link(zip_file, "zip"), unsafe_allow_html=True)
+        else:
+             # Ensure correct indentation here for the else block
+             st.caption("No zip archives found.")
+
+
+# ==============================================================================
+# Main Execution Logic
+# ==============================================================================
+
+def initialize_world():
+    """Loads initial world state (most recent) if not already done for this session."""
+    if not st.session_state.get('initial_world_state_loaded', False):
+        print("Performing initial world load for session...")
+        saved_worlds = get_saved_worlds()
+        loaded_successfully = False
+        if saved_worlds:
+             latest_world_file_basename = os.path.basename(saved_worlds[0]['filename'])
+             print(f"Loading most recent world on startup: {latest_world_file_basename}")
+             if load_world_state_from_md(latest_world_file_basename): loaded_successfully = True
+             else: print("Failed to load most recent world, starting empty.")
+        else: print("No saved worlds found, starting with empty state.")
+        if not loaded_successfully:
+             with world_objects_lock: world_objects.clear()
+             st.session_state.current_world_file = None
+        st.session_state.initial_world_state_loaded = True
+        print("Initial world load process complete.")
+
+if __name__ == "__main__":
+    # 1. Initialize session state
+    init_session_state()
+
+    # 2. Start WebSocket server thread if needed
+    server_thread = st.session_state.get('server_task'); server_alive = server_thread is not None and server_thread.is_alive()
+    if not st.session_state.get('server_running_flag', False) and not server_alive: start_websocket_server_thread()
+    elif server_alive and not st.session_state.get('server_running_flag', False): st.session_state.server_running_flag = True
+
+    # 3. Load initial world state (once per session)
+    initialize_world()
+
+    # 4. Render UI
+    render_sidebar()
+    render_main_content()