Update app.py

app.py

@@ -1,306 +1,952 @@
-# app.py
+# app.py (Refactored & Consolidated)
 import streamlit as st
-import streamlit.components.v1 as components
+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 pandas as pd
-import uuid
-import math # For floor function
-# from PIL import Image, ImageDraw # No longer needed for minimap
-from streamlit_js_eval import streamlit_js_eval # For JS communication
-
-# --- Constants ---
-SAVE_DIR = "saved_worlds"
-PLOT_WIDTH = 50.0 # Width of each plot in 3D space
-PLOT_DEPTH = 50.0 # Depth of each plot (can be same as width)
-CSV_COLUMNS = ['obj_id', 'type', 'pos_x', 'pos_y', 'pos_z', 'rot_x', 'rot_y', 'rot_z', 'rot_order']
-
-# --- Ensure Save Directory Exists ---
-os.makedirs(SAVE_DIR, exist_ok=True)
-
-# --- Helper Functions ---
-
-@st.cache_data(ttl=3600) # Cache plot list
-def load_plot_metadata():
-    """Scans save dir for plot_X*_Z*.csv, sorts, calculates metadata."""
-    plots = []
-    plot_files = []
+import zipfile
+from dotenv import load_dotenv
+from streamlit_marquee import streamlit_marquee
+from collections import defaultdict, Counter
+import pandas as pd # Still used for fallback CSV load? Keep for now.
+from streamlit_js_eval import streamlit_js_eval
+from PIL import Image
+
+# ==============================================================================
+# 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": "📄"}
+
+# API Keys (Load from .env or secrets)
+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', ""))
+
+# Mapping Emojis to Primitive Types
+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"
+}
+
+# ==============================================================================
+# Global State & Locks
+# ==============================================================================
+
+# Thread lock for accessing shared world state
+world_objects_lock = threading.Lock()
+# In-memory world state {obj_id: data} - Use defaultdict for convenience
+world_objects = defaultdict(dict)
+# Set of active WebSocket client IDs
+connected_clients = set()
+
+# ==============================================================================
+# Utility Functions
+# ==============================================================================
+
+def get_current_time_str(tz='UTC'):
+    """Gets formatted timestamp string in specified timezone (default UTC)."""
     try:
-        plot_files = [f for f in os.listdir(SAVE_DIR) if f.endswith(".csv") and f.startswith("plot_X")]
-    except FileNotFoundError:
-        st.error(f"Save directory '{SAVE_DIR}' not found.")
-        return []
+        timezone = pytz.timezone(tz)
+        # Get current datetime localized to the specified timezone
+        now_aware = datetime.now(timezone)
+    except pytz.UnknownTimeZoneError:
+        # Fallback to UTC if timezone is unknown
+        now_aware = datetime.now(pytz.utc)
     except Exception as e:
-        st.error(f"Error listing save directory '{SAVE_DIR}': {e}")
-        return []
+         # General fallback if timezone localization fails
+         print(f"Timezone error ({tz}), using UTC. Error: {e}")
+         now_aware = datetime.now(pytz.utc)
 
-    # Parse filenames to get grid coordinates
-    parsed_plots = []
-    for filename in plot_files:
-        try:
-            parts = filename[:-4].split('_') # Remove .csv
-            grid_x = int(parts[1][1:]) # Extract number after X
-            grid_z = int(parts[2][1:]) # Extract number after Z
-            # Extract name if present (parts after Z coordinate)
-            plot_name = " ".join(parts[3:]) if len(parts) > 3 else f"Plot ({grid_x},{grid_z})"
-
-            parsed_plots.append({
-                'id': filename[:-4], # Use filename base as unique ID
-                'filename': filename,
-                'grid_x': grid_x,
-                'grid_z': grid_z,
-                'name': plot_name,
-                'x_offset': grid_x * PLOT_WIDTH,
-                'z_offset': grid_z * PLOT_DEPTH # Use PLOT_DEPTH for Z offset
-            })
-        except (IndexError, ValueError):
-            st.warning(f"Could not parse grid coordinates from filename: {filename}. Skipping.")
-            continue
-
-    # Sort primarily by X, then by Z
-    parsed_plots.sort(key=lambda p: (p['grid_x'], p['grid_z']))
-
-    return parsed_plots
-
-def load_plot_objects(filename, x_offset, z_offset):
-    """Loads objects from a CSV, applying the plot's world offsets."""
-    file_path = os.path.join(SAVE_DIR, filename)
-    objects = []
-    try:
-        df = pd.read_csv(file_path)
-        # Check required columns
-        if not all(col in df.columns for col in ['type', 'pos_x', 'pos_y', 'pos_z']):
-             st.warning(f"CSV '{filename}' missing essential columns. Skipping.")
-             return []
-        # Add defaults for optional columns
-        df['obj_id'] = df.get('obj_id', pd.Series([str(uuid.uuid4()) for _ in range(len(df))]))
-        for col, default in [('rot_x', 0.0), ('rot_y', 0.0), ('rot_z', 0.0), ('rot_order', 'XYZ')]:
-             if col not in df.columns: df[col] = default
-
-        for _, row in df.iterrows():
-            obj_data = row.to_dict()
-            # Apply world offset
-            obj_data['pos_x'] += x_offset
-            obj_data['pos_z'] += z_offset # Apply Z offset too
-            objects.append(obj_data)
-        return objects
-    except FileNotFoundError:
-        st.error(f"File not found during object load: {filename}")
-        return []
-    except pd.errors.EmptyDataError:
-         return [] # Empty file is valid
-    except Exception as e:
-        st.error(f"Error loading objects from {filename}: {e}")
-        return []
-
-def save_plot_data(filename, objects_data_list, plot_x_offset, plot_z_offset):
-    """Saves object data list to a CSV, making positions relative to plot origin."""
-    file_path = os.path.join(SAVE_DIR, filename)
-    relative_objects = []
-    if not isinstance(objects_data_list, list):
-        st.error("Invalid data format received for saving (expected a list).")
-        return False
+    return now_aware.strftime('%Y%m%d_%H%M%S')
 
-    for obj in objects_data_list:
-        pos = obj.get('position', {})
-        rot = obj.get('rotation', {})
-        obj_type = obj.get('type', 'Unknown')
-        obj_id = obj.get('obj_id', str(uuid.uuid4()))
-
-        if not all(k in pos for k in ['x', 'y', 'z']) or obj_type == 'Unknown':
-            print(f"Skipping malformed object during save prep: {obj}")
-            continue
-
-        relative_obj = {
-            'obj_id': obj_id, 'type': obj_type,
-            'pos_x': pos.get('x', 0.0) - plot_x_offset, # Make relative X
-            'pos_y': pos.get('y', 0.0),
-            'pos_z': pos.get('z', 0.0) - plot_z_offset, # Make relative Z
-            'rot_x': rot.get('_x', 0.0), 'rot_y': rot.get('_y', 0.0), 'rot_z': rot.get('_z', 0.0),
-            'rot_order': rot.get('_order', 'XYZ')
-        }
-        relative_objects.append(relative_obj)
 
+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."""
     try:
-        df = pd.DataFrame(relative_objects, columns=CSV_COLUMNS)
-        df.to_csv(file_path, index=False)
-        st.success(f"Saved {len(relative_objects)} objects to {filename}")
-        return True
+        loop = asyncio.get_running_loop()
+        # Schedule as task if loop is running
+        return loop.create_task(async_func(*args, **kwargs))
+    except RuntimeError: # No running loop
+        # Run in a new loop (blocks until completion)
+        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 # Indicate error or failure
     except Exception as e:
-        st.error(f"Failed to save plot data to {filename}: {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)
+    # Ensure prefix and suffix are correct
+    if basename.startswith(WORLD_STATE_FILE_MD_PREFIX) and basename.endswith(".md"):
+        parts = basename[len(WORLD_STATE_FILE_MD_PREFIX):-3].split('_') # Remove prefix and suffix before split
+        if len(parts) >= 3: # Expecting Name_Timestamp_Hash
+            timestamp_str = parts[-2]
+            name = " ".join(parts[:-2]) # Join potentially multiple parts for name
+            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 since generated with UTC
+            except (ValueError, pytz.exceptions.AmbiguousTimeError, pytz.exceptions.NonExistentTimeError):
+                dt_obj = None # Parsing failed or timezone issue
+            return {"name": name or "Untitled", "timestamp": timestamp_str, "dt": dt_obj, "filename": filename}
+
+    # Fallback for unknown format or parsing failure
+    dt_fallback = None
+    try:
+         mtime = os.path.getmtime(filename)
+         dt_fallback = datetime.fromtimestamp(mtime, tz=pytz.utc)
+    except Exception: pass # Ignore errors getting mtime
+    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 {len(world_objects)} objects to: {save_path}...")
+    success = False
+    with world_objects_lock:
+        world_data_dict = dict(world_objects) # Create copy inside lock
+        print(f"Saving {len(world_data_dict)} objects...")
+        parsed_info = parse_world_filename(target_filename_base) # Use original filename for info
+        timestamp_save = get_current_time_str()
+        md_content = f"""# World State: {parsed_info['name']}
+* **File Saved:** {timestamp_save} (UTC)
+* **Original Timestamp:** {parsed_info['timestamp']}
+* **Objects:** {len(world_data_dict)}
+
+```json
+{json.dumps(world_data_dict, indent=2)}
+```"""
+        try:
+            ensure_dir(SAVED_WORLDS_DIR) # Ensure dir exists
+            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}")
+            # Avoid st.error in potentially non-main thread
+    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
 
-# --- Page Config ---
-st.set_page_config( page_title="Infinite World Builder", layout="wide")
-
-# --- Initialize Session State ---
-if 'selected_object' not in st.session_state: st.session_state.selected_object = 'None'
-if 'new_plot_name' not in st.session_state: st.session_state.new_plot_name = "" # No longer used for filename
-if 'js_save_data_result' not in st.session_state: st.session_state.js_save_data_result = None
-
-# --- Load Plot Metadata ---
-# This is now the source of truth for saved plots
-plots_metadata = load_plot_metadata()
-
-# --- Load ALL Objects for Rendering ---
-all_initial_objects = []
-for plot in plots_metadata:
-    all_initial_objects.extend(load_plot_objects(plot['filename'], plot['x_offset'], plot['z_offset']))
-
-# --- Sidebar ---
-with st.sidebar:
-    st.title("🏗️ World Controls")
-
-    st.header("Navigation (Plots)")
-    st.caption("Click to teleport player to a plot.")
-    max_cols = 2 # Adjust columns for potentially more buttons
-    cols = st.columns(max_cols)
-    col_idx = 0
-    # Sort buttons by grid coords for logical layout
-    sorted_plots_for_nav = sorted(plots_metadata, key=lambda p: (p['grid_x'], p['grid_z']))
-    for plot in sorted_plots_for_nav:
-        button_label = f"➡️ {plot.get('name', plot['id'])} ({plot['grid_x']},{plot['grid_z']})"
-        if cols[col_idx].button(button_label, key=f"nav_{plot['id']}"):
-            target_x = plot['x_offset']
-            target_z = plot['z_offset'] # Use Z offset too
-            try:
-                # Tell JS where to teleport (center of plot approx)
-                js_code = f"teleportPlayer({target_x + PLOT_WIDTH/2}, {target_z + PLOT_DEPTH/2});"
-                streamlit_js_eval(js_code=js_code, key=f"teleport_{plot['id']}")
-            except Exception as e:
-                 st.error(f"Failed to send teleport command: {e}")
-        col_idx = (col_idx + 1) % max_cols
-
-    st.markdown("---")
-
-    # --- Object Placement ---
-    st.header("Place Objects")
-    object_types = ["None", "Simple House", "Tree", "Rock", "Fence Post"]
-    current_object_index = object_types.index(st.session_state.selected_object) if st.session_state.selected_object in object_types else 0
-    selected_object_type_widget = st.selectbox(
-        "Select Object:", options=object_types, index=current_object_index, key="selected_object_widget"
-    )
-    if selected_object_type_widget != st.session_state.selected_object:
-         st.session_state.selected_object = selected_object_type_widget
-         # Rerun will happen, JS reloads state via sessionStorage, Python injects new selection
-
-    st.markdown("---")
-
-    # --- Saving ---
-    st.header("Save Work")
-    st.caption("Saves newly placed objects to the plot the player is currently in. If it's a new area, a new plot file is created.")
-    if st.button("💾 Save Current Work", key="save_button"):
-        # Trigger JS to get data AND player position
-        js_get_data_code = "getSaveDataAndPosition();" # JS function needs update
-        streamlit_js_eval(js_code=js_get_data_code, key="js_save_processor")
-        st.rerun() # Rerun to process result
-
-
-# --- Process Save Data ---
-save_data_from_js = st.session_state.get("js_save_processor", None)
-
-if save_data_from_js is not None:
-    st.info("Received save data from client...")
-    save_processed_successfully = False
     try:
-        # Expecting { playerPosition: {x,y,z}, objectsToSave: [...] }
-        payload = json.loads(save_data_from_js) if isinstance(save_data_from_js, str) else save_data_from_js
-
-        if isinstance(payload, dict) and 'playerPosition' in payload and 'objectsToSave' in payload:
-            player_pos = payload['playerPosition']
-            objects_to_save = payload['objectsToSave']
-
-            if isinstance(objects_to_save, list): # Allow saving empty list (clears new objects)
-                # Determine target plot based on player position
-                target_grid_x = math.floor(player_pos.get('x', 0.0) / PLOT_WIDTH)
-                target_grid_z = math.floor(player_pos.get('z', 0.0) / PLOT_DEPTH) # Use Z pos too
-
-                target_filename = f"plot_X{target_grid_x}_Z{target_grid_z}.csv"
-                target_plot_x_offset = target_grid_x * PLOT_WIDTH
-                target_plot_z_offset = target_grid_z * PLOT_DEPTH
-
-                st.write(f"Attempting to save plot: {target_filename} (Player at: x={player_pos.get('x', 0):.1f}, z={player_pos.get('z', 0):.1f})")
-
-                # Check if this plot already exists in metadata (for logging/future logic)
-                is_new_plot_file = not os.path.exists(os.path.join(SAVE_DIR, target_filename))
-
-                save_ok = save_plot_data(target_filename, objects_to_save, target_plot_x_offset, target_plot_z_offset)
-
-                if save_ok:
-                    load_plot_metadata.clear() # Clear cache to force reload metadata
-                    try: # Tell JS to clear its unsaved state
-                         streamlit_js_eval(js_code="resetNewlyPlacedObjects();", key="reset_js_state")
-                    except Exception as js_e:
-                         st.warning(f"Could not reset JS state after save: {js_e}")
-
-                    if is_new_plot_file:
-                        st.success(f"New plot created and saved: {target_filename}")
-                    else:
-                        st.success(f"Updated existing plot: {target_filename}")
-                    save_processed_successfully = True
-                else:
-                    st.error(f"Failed to save plot data to file: {target_filename}")
-            else:
-                st.error("Invalid 'objectsToSave' format received (expected list).")
-        else:
-            st.error("Invalid save payload structure received from client.")
-            print("Received payload:", payload) # Log for debugging
-
-    except json.JSONDecodeError:
-        st.error("Failed to decode save data from client.")
-        print("Received raw data:", save_data_from_js)
-    except Exception as e:
-        st.error(f"Error processing save: {e}")
-        st.exception(e)
-
-    # Clear the trigger data from session state
-    st.session_state.js_save_processor = None
-    # Rerun after processing to reflect changes
-    if save_processed_successfully:
-        st.rerun()
+        with open(load_path, 'r', encoding='utf-8') as f: content = f.read()
+        json_match = re.search(r"```json\s*(\{.*?\})\s*```", content, re.DOTALL | re.IGNORECASE)
+        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() # Clear previous state
+             for k, v in world_data_dict.items(): world_objects[str(k)] = v # Update with loaded data
+             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
 
-# --- Main Area ---
-st.header("Infinite Shared 3D World")
-st.caption("Move to empty areas to expand the world. Use sidebar 'Save' to save work to current plot.")
+def get_saved_worlds():
+    """Scans the saved worlds directory for 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]
+        # Sort by datetime object if available (newest first)
+        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 []
 
-# --- Load and Prepare HTML ---
-html_file_path = 'index.html'
-html_content_with_state = None
+# ==============================================================================
+# User State & Session Init
+# ==============================================================================
 
-try:
-    with open(html_file_path, 'r', encoding='utf-8') as f:
-        html_template = f.read()
+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}")
 
-    # --- Inject Python state into JavaScript ---
-    js_injection_script = f"""
-<script>
-    window.ALL_INITIAL_OBJECTS = {json.dumps(all_initial_objects)};
-    window.PLOTS_METADATA = {json.dumps(plots_metadata)}; // Send plot info to JS
+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) # Remove markdown links, keep text
+    text = re.sub(r'[#*_`!]', '', text) # Remove some markdown chars
+    text = ' '.join(text.split()) # Normalize whitespace
+    return text[:250] or "No text"
+
+def create_file(content, username, file_type="md", save_path=None):
+    if not save_path:
+         # Generate filename if specific path not given
+         filename = generate_filename(content, username, file_type)
+         save_path = os.path.join(MEDIA_DIR, filename) # Save to base dir by default
+    ensure_dir(os.path.dirname(save_path)) # Ensure directory exists
+    try:
+        with open(save_path, 'w', encoding='utf-8') as f: f.write(content)
+        print(f"Created file: {save_path}"); 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"):
+    """Generates a base64 download link for a given file."""
+    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}">{FILE_EMOJIS.get(file_type, "📄")} DL</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):
+    """Generates TTS audio using EdgeTTS and caches the result."""
+    if not text: return None
+    # Cache key based on text hash and voice
+    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):
+    """Displays audio player and download link in Streamlit."""
+    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: {e}")
+    else: st.warning(f"Audio file not found: {os.path.basename(file_path) if file_path else 'N/A'}")
+
+# --- Chat ---
+async def save_chat_entry(username, message, voice, is_markdown=False):
+    """Saves chat entry to a file and session state, generates audio."""
+    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)
+    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():
+    """Loads chat history from files if session state is empty."""
+    if 'chat_history' not in st.session_state: st.session_state.chat_history = []
+    if not st.session_state.chat_history:
+        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
+        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))
+                 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):
+    protected = [STATE_FILE, "app.py", "index.html", "requirements.txt", "README.md"]
+    # Dynamically protect all currently saved world files unless explicitly targeted
+    try:
+        current_worlds = [os.path.basename(w['filename']) for w in get_saved_worlds()]
+        protected.extend(current_worlds)
+    except Exception: pass # Ignore if world listing fails
+    if exclude_files: protected.extend(exclude_files)
+
+    deleted_count = 0; errors = 0
+    for pattern in file_patterns:
+         pattern_path = os.path.join(MEDIA_DIR, pattern) # Assume relative to app dir
+         try:
+              files_to_delete = glob.glob(pattern_path)
+              if not files_to_delete: continue
+              for f_path in files_to_delete:
+                   basename = os.path.basename(f_path)
+                   # Check if it's a file and NOT protected
+                   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"Err matching {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.")
+    # Clear relevant caches
+    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
+      with st.form(key="paste_form"):
+           paste_input = st.text_area("Paste Image Data Here (Ctrl+V)", key="paste_input_area", height=50); submit_button = st.form_submit_button("Paste Image 📋")
+           if submit_button and 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 = ""
+           elif submit_button: st.warning("No valid img data."); st.session_state.paste_image_base64 = ""
+      # Return the image object if successfully pasted and submitted
+      return pasted_img if submit_button and pasted_img else None
+
+
+# --- PDF Processing ---
+# Note: Depends on PyPDF2 and potentially AudioProcessor class if generating audio
+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=f"{self.cache_dir}/{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")
+      if pdf_file is None:
+           st.info("Upload a PDF file to begin.")
+           return
+      audio_processor = AudioProcessor() # Instance for this run
+      try:
+          reader=PdfReader(pdf_file); 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):
+              # Runs async audio generation in a separate thread
+              async def run_async_audio(): return await audio_processor.create_audio(page_text, voice)
+              try: audio_path = asyncio.run(run_async_audio());
+                   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):
+               text=reader.pages[i].extract_text();
+               if text: 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]"
+
+          # Display results as they become available (or after join)
+          st.progress(0) # Placeholder for progress
+          # Wait for threads and display - consider using st.empty() for updates
+          for thread in page_threads: thread.join()
+
+          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 pending.")
+
+      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):
+     """Wrapper to send message and handle potential connection errors."""
+     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):
+    """Sends a message to all connected clients except the excluded one."""
+    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) # Gather results/exceptions
+
+async def broadcast_world_update():
+    """Broadcasts the current world state to all clients."""
+    with world_objects_lock: current_state_payload = dict(world_objects)
+    update_msg = json.dumps({"type": "initial_state", "payload": current_state_payload}) # Force full refresh
+    print(f"Broadcasting full world update ({len(current_state_payload)} objects)...")
+    await broadcast_message(update_msg)
+
+async def websocket_handler(websocket, path):
+    """Handles WebSocket connections and messages."""
+    await register_client(websocket); client_id = str(websocket.id);
+    username = st.session_state.get('username', f"User_{client_id[:4]}") # Get username for this session
+    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", {});
+                # Use username from payload if provided, otherwise session username
+                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"));
+                    # Schedule save/TTS, but broadcast immediately
+                    run_async(save_chat_entry, sender_username, chat_text, voice) # Fire and forget save
+                    await broadcast_message(message, exclude_id=client_id) # Forward original msg
+
+                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") # Optionally include 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)
+
+                # Add more handlers here
+
+            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():
+    """Coroutine to run the 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() # Keep running
+    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():
+    """Starts the WebSocket server in a separate thread if not already running."""
+    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 = asyncio.new_event_loop(); asyncio.set_event_loop(loop)
+        try: loop.run_until_complete(run_websocket_server())
+        finally: loop.close(); print("Server thread loop closed.")
+    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
+# ==============================================================================
+
+def render_sidebar():
+    """Renders the Streamlit sidebar contents."""
+    with st.sidebar:
+        st.header("💾 World Versions")
+        st.caption("Load or save named world states.")
+
+        # World Selector
+        saved_worlds = get_saved_worlds()
+        # Create display text mapping filename to formatted string
+        world_options = {w['filename']: f"{w['name']} ({w['timestamp']})" for w in saved_worlds}
+        # Get the currently selected filename (basename) from session state
+        current_selection_basename = st.session_state.get('current_world_file', None)
+
+        # Prepare options for radio button: None first, then filenames
+        radio_options_list = [None] + [w['filename'] for w in saved_worlds] # Store full path initially? No, use basename.
+        radio_options_basenames = [None] + [os.path.basename(w['filename']) for w in saved_worlds]
+
+        # Find the index of the current selection in the options list
+        current_radio_index = 0 # Default to "Live State"
+        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 # Fallback if filename somehow not in list
+
+        # Display radio buttons
+        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.get(os.path.join(SAVED_WORLDS_DIR, x), x), # Format using full path to get name/time? complex
+             key="world_selector_radio"
+         )
+
+        # Handle selection change
+        if selected_basename != current_selection_basename:
+             st.session_state.current_world_file = selected_basename # Store basename
+             if selected_basename:
+                  with st.spinner(f"Loading {selected_basename}..."):
+                      if load_world_state_from_md(selected_basename):
+                          run_async(broadcast_world_update) # Broadcast new state
+                          st.toast("World loaded!", icon="✅")
+                      else:
+                          st.error("Failed to load world."); st.session_state.current_world_file = None # Reset on failure
+             else:
+                  print("Switched to live state.")
+                  # Optionally clear world or just stop tracking file? Stop tracking.
+                  # Maybe broadcast current live state if switching TO live?
+                  # run_async(broadcast_world_update) # Broadcast current live state
+                  st.toast("Switched to Live State.")
+             st.rerun()
+
+        # Display download links
+        st.caption("Download:")
+        cols = st.columns([3, 1]) # Columns for name and download button
+        with cols[0]: st.write("**Name**")
+        with cols[1]: st.write("**Link**")
+        for world_info in saved_worlds:
+            f_basename = os.path.basename(world_info['filename'])
+            f_fullpath = world_info['filename'] # Full path needed for reading file
+            display_name = world_info.get('name', f_basename)
+            timestamp = world_info.get('timestamp', 'N/A')
+            col1, col2 = st.columns([3, 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("---")
+
+        # Save New Version moved to Files Tab
+
+        # Build Tools section
+        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: streamlit_js_eval(f"updateSelectedObjectType({json.dumps(name)});", key=f"update_tool_js_{name}")) # Fire-and-forget JS update
+                    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()
+
+        # Voice/User section
+        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 = st.session_state.get('current_world_file', None)
+        if current_file: parsed = parse_world_filename(current_file); st.info(f"Current World: **{parsed['name']}** (`{os.path.basename(current_file)}`)")
+        else: st.info("Live State Active (Unsaved changes will be lost unless saved as new version)")
+
+        # Embed HTML Component
+        html_file_path = 'index.html'
+        try:
+            with open(html_file_path, 'r', encoding='utf-8') as f: html_template = f.read()
+            try: # Get WS URL
+                 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: ws_url = "ws://localhost:8765"
+
+            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:", {{
-        selectedObject: window.SELECTED_OBJECT_TYPE,
-        initialObjectsCount: window.ALL_INITIAL_OBJECTS ? window.ALL_INITIAL_OBJECTS.length : 0,
-        plotCount: window.PLOTS_METADATA ? window.PLOTS_METADATA.length : 0,
-        plotWidth: window.PLOT_WIDTH,
-        plotDepth: window.PLOT_DEPTH
-    }});
-</script>
-"""
-    html_content_with_state = html_template.replace('</head>', js_injection_script + '\n</head>', 1)
-
-    # --- Embed HTML Component ---
-    components.html(
-        html_content_with_state,
-        height=750,
-        scrolling=False
-    )
-
-except FileNotFoundError:
-    st.error(f"CRITICAL ERROR: Could not find the file '{html_file_path}'.")
-    st.warning(f"Make sure `{html_file_path}` is in the same directory as `app.py` and `{SAVE_DIR}` exists.")
-except Exception as e:
-    st.error(f"An critical error occurred during HTML preparation or component rendering: {e}")
-    st.exception(e)
+    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 = run_async(load_chat_history).result() if 'chat_history' not in st.session_state else st.session_state.chat_history # Load sync if needed
+        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.")
+
+        # Chat Input Area
+        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) # Send via WS
+                run_async(save_chat_entry, st.session_state.username, message_to_send, voice) # Save locally
+                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") # Toggle 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") # Limit pages
+         if pdf_file:
+              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 = st.session_state.get('current_world_file', None)
+
+        # Save Current Version Button
+        if current_file:
+             parsed = parse_world_filename(current_file); save_label = f"Save Changes to '{parsed['name']}'"
+             if st.button(save_label, key="save_current_world", help=f"Overwrite '{os.path.basename(current_file)}' with current live state."):
+                 with st.spinner(f"Overwriting {os.path.basename(current_file)}..."):
+                     if save_world_state_to_md(current_file): st.success("Current world version saved!")
+                     else: st.error("Failed to save world state.")
+         else:
+             st.info("Load a world version from the sidebar or use 'Save New Version' below to save the current live state.")
+
+        # Save As New Version Section
+        st.subheader("Save As New Version")
+        new_name_files = st.text_input("New World Name:", key="new_world_name_files") # Use different key from sidebar one if kept there
+        if st.button("💾 Save Live State as New Version", key="save_new_version_files"):
+             if new_name_files.strip():
+                  new_filename = generate_world_save_filename(new_name_files) # Generates basename
+                  with st.spinner(f"Saving new version '{new_name_files}'..."):
+                      if save_world_state_to_md(new_filename): # Pass basename
+                          st.success(f"Saved as {new_filename}")
+                          st.session_state.current_world_file = new_filename # Switch to new file automatically
+                          st.session_state.new_world_name_files = "" # Reset input
+                          st.rerun()
+                      else: st.error("Failed to save new version.")
+             else: st.warning("Please enter a name for the new world version.")
+
+        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))
+
+        # File Deletion
+        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", help="Deletes world save files (.md) in saved_worlds"): 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", help="Deletes Chats, Audio, Worlds, Zips"): 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()
+
+        # Download Archives
+        st.subheader("📦 Download Archives")
+        zip_files = sorted(glob.glob("*.zip"), key=os.path.getmtime, reverse=True)
+        if zip_files:
+             for zip_file in zip_files: st.markdown(get_download_link(zip_file, "zip"), unsafe_allow_html=True)
+        else: st.caption("No zip archives found.")
+
+
+# ==============================================================================
+# Main Execution Logic
+# ==============================================================================
+
+def initialize_world():
+    """Loads initial world state (most recent) if not already loaded."""
+    if not st.session_state.get('initial_world_state_loaded', False):
+        print("Performing initial world load...")
+        saved_worlds = get_saved_worlds()
+        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}")
+             load_world_state_from_md(latest_world_file_basename) # This updates global state and sets session state 'current_world_file'
+         else:
+              print("No saved worlds found, starting with empty state.")
+              with world_objects_lock: world_objects.clear() # Ensure empty state
+              st.session_state.current_world_file = None # Ensure no file is marked as loaded
+         st.session_state.initial_world_state_loaded = True
+         print("Initial world load complete.")
+
+
+if __name__ == "__main__":
+    # 1. Initialize session state first
+    init_session_state()
+
+    # 2. Start WebSocket server thread if needed
+    # Use server_running_flag to prevent multiple start attempts within one session
+    if not st.session_state.get('server_running_flag', False):
+         if 'server_task' not in st.session_state or not st.session_state.server_task.is_alive():
+              start_websocket_server_thread()
+         else:
+              # If task exists but flag is false, maybe update flag?
+              if st.session_state.server_task.is_alive():
+                  st.session_state.server_running_flag = True
+                  print("Corrected server_running_flag based on alive thread.")
+
+
+    # 3. Load initial world state from disk if needed
+    initialize_world()
+
+    # 4. Render the UI (Sidebar and Main Content)
+    render_sidebar()
+    render_main_content()