app.py

import streamlit as st
import os
import json
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 random
import asyncio
from datetime import datetime
from PyPDF2 import PdfReader
import threading
from PIL import Image
from streamlit_javascript import st_javascript

# ==============================================================================
# Configuration & Constants
# ==============================================================================

nest_asyncio.apply()

st.set_page_config(
    page_title="🤖🏗️ Shared World Builder 🏆",
    page_icon="🏗️",
    layout="wide",
    initial_sidebar_state="expanded"
)

icons = '🤖🏗️🗣️💾'
Site_Name = '🤖🏗️ Shared World Builder 🗣️'
START_ROOM = "World Lobby 🌍"
MEDIA_DIR = "."
STATE_FILE = "user_state.txt"

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_CACHE_DIR = "audio_cache"
AUDIO_DIR = "audio_logs"
SAVED_WORLDS_DIR = "saved_worlds"
HISTORY_LOG_DIR = "history_logs"
PLOT_WIDTH = 50.0
PLOT_DEPTH = 50.0
WORLD_STATE_FILE = os.path.join(SAVED_WORLDS_DIR, "history.json")
PLAYER_TIMEOUT_SECONDS = 15 * 60  # 15 minutes

FILE_EMOJIS = {"md": "📝", "mp3": "🎵", "png": "🖼️", "mp4": "🎥", "zip": "📦", "json": "📄"}

PRIMITIVE_MAP = {
    "🌳": "Tree", "🗿": "Rock", "🏛️": "Simple House", "🌲": "Pine Tree", "🧱": "Brick Wall",
    "🔵": "Sphere", "📦": "Cube", "🧴": "Cylinder", "🍦": "Cone", "🍩": "Torus",
    "🍄": "Mushroom", "🌵": "Cactus", "🔥": "Campfire", "⭐": "Star", "💎": "Gem",
    "🗼": "Tower", "🚧": "Barrier", "⛲": "Fountain", "🏮": "Lantern", "🪧": "Sign Post"
}

for d in [CHAT_DIR, AUDIO_DIR, AUDIO_CACHE_DIR, SAVED_WORLDS_DIR, HISTORY_LOG_DIR]:
    os.makedirs(d, exist_ok=True)

state_lock = threading.Lock()

# ==============================================================================
# Utility Functions
# ==============================================================================

def get_current_time_str(tz='UTC'):
    try:
        timezone = pytz.timezone(tz)
        now_aware = datetime.now(timezone)
    except pytz.UnknownTimeZoneError:
        now_aware = datetime.now(pytz.utc)
    return now_aware.strftime('%Y%m%d_%H%M%S')

def clean_filename_part(text, max_len=30):
    if not isinstance(text, str):
        text = "invalid_name"
    text = re.sub(r'\s+', '_', text)
    text = re.sub(r'[^\w\-.]', '', text)
    return text[:max_len]

def ensure_dir(dir_path):
    os.makedirs(dir_path, exist_ok=True)

def generate_filename(content, username, extension):
    timestamp = get_current_time_str()
    content_hash = hashlib.md5(content[:150].encode()).hexdigest()[:6]
    clean_username = clean_filename_part(username)
    return f"{clean_username}_{timestamp}_{content_hash}.{extension}"

# ==============================================================================
# History File Management
# ==============================================================================

def initialize_history_file():
    ensure_dir(SAVED_WORLDS_DIR)
    if not os.path.exists(WORLD_STATE_FILE):
        initial_state = {"objects": {}, "players": {}}
        with open(WORLD_STATE_FILE, 'w', encoding='utf-8') as f:
            json.dump(initial_state, f, indent=2)

def read_history_file():
    initialize_history_file()
    try:
        with open(WORLD_STATE_FILE, 'r', encoding='utf-8') as f:
            return json.load(f)
    except Exception as e:
        print(f"Error reading history file: {e}")
        return {"objects": {}, "players": {}}

def write_history_file(state):
    with state_lock:
        try:
            with open(WORLD_STATE_FILE, 'w', encoding='utf-8') as f:
                json.dump(state, f, indent=2)
        except Exception as e:
            print(f"Error writing history file: {e}")

def prune_inactive_players(state):
    current_time = time.time()
    players = state.get("players", {})
    updated_players = {}
    for username, data in players.items():
        last_action = data.get("last_action_timestamp", 0)
        if current_time - last_action <= PLAYER_TIMEOUT_SECONDS:
            updated_players[username] = data
    state["players"] = updated_players
    return state

def update_player_state(username, position=None):
    state = read_history_file()
    state = prune_inactive_players(state)
    players = state.get("players", {})
    if username not in players:
        players[username] = {"position": position or {"x": PLOT_WIDTH / 2, "y": 0.5, "z": PLOT_DEPTH / 2}, "last_action_timestamp": time.time()}
    else:
        if position:
            players[username]["position"] = position
        players[username]["last_action_timestamp"] = time.time()
    state["players"] = players
    write_history_file(state)
    return state

def add_object_to_state(obj_data, username):
    state = read_history_file()
    state = prune_inactive_players(state)
    state["objects"][obj_data["obj_id"]] = obj_data
    write_history_file(state)
    log_action(username, "place", obj_data)
    return state

def remove_object_from_state(obj_id, username):
    state = read_history_file()
    state = prune_inactive_players(state)
    if obj_id in state["objects"]:
        obj_data = state["objects"][obj_id]
        del state["objects"][obj_id]
        write_history_file(state)
        log_action(username, "delete", {"obj_id": obj_id})
        return state, obj_data
    return state, None

def log_action(username, action_type, data):
    timestamp = get_current_time_str()
    log_entry = {
        "timestamp": timestamp,
        "username": username,
        "action": action_type,
        "data": data
    }
    shared_log_file = os.path.join(HISTORY_LOG_DIR, "shared_history.jsonl")
    try:
        with open(shared_log_file, 'a', encoding='utf-8') as f:
            f.write(json.dumps(log_entry) + '\n')
    except Exception as e:
        print(f"Error writing to shared history log: {e}")
    clean_username = clean_filename_part(username)
    player_log_file = os.path.join(HISTORY_LOG_DIR, f"{clean_username}_history.jsonl")
    try:
        with open(player_log_file, 'a', encoding='utf-8') as f:
            f.write(json.dumps(log_entry) + '\n')
    except Exception as e:
        print(f"Error writing to player history log {player_log_file}: {e}")

# ==============================================================================
# JavaScript Message Handling
# ==============================================================================

def handle_js_messages():
    message = st_javascript("""
        window.addEventListener('message', (event) => {
            return JSON.stringify(event.data);
        }, {once: true});
        return null;
    """)
    if message:
        try:
            data = json.loads(message)
            action = data.get("type")
            payload = data.get("payload", {})
            username = payload.get("username", st.session_state.username)
            if action == "place_object":
                state = add_object_to_state(payload["object_data"], username)
                st.session_state.world_state = state
                st.rerun()
            elif action == "delete_object":
                state, obj_data = remove_object_from_state(payload["obj_id"], username)
                st.session_state.world_state = state
                st.rerun()
            elif action == "move_player":
                state = update_player_state(username, payload["position"])
                log_action(username, "move", payload["position"])
                st.session_state.world_state = state
                st.rerun()
        except json.JSONDecodeError:
            print(f"Invalid JS message: {message}")
        except Exception as e:
            print(f"Error handling JS message: {e}")

# ==============================================================================
# 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():
    defaults = {
        'message_counter': 0,
        'audio_cache': {},
        'tts_voice': "en-US-AriaNeural",
        'chat_history': [],
        'enable_audio': True,
        'download_link_cache': {},
        'username': None,
        'autosend': False,
        'last_message': "",
        'selected_object': 'None',
        'paste_image_base64': "",
        'new_world_name': "MyWorld",
        'world_state': {"objects": {}, "players": {}}
    }
    for k, v in defaults.items():
        if k not in st.session_state:
            st.session_state[k] = v
    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 = {}
    if 'username' not in st.session_state or not st.session_state.username:
        st.session_state.username = random.choice(list(FUN_USERNAMES.keys()))
        save_username(st.session_state.username)
    update_player_state(st.session_state.username)

# ==============================================================================
# Audio / TTS / Chat / File Handling 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)
        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>")

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}")

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)
    if 'chat_history' not in st.session_state:
        st.session_state.chat_history = []
    st.session_state.chat_history.append(entry)
    audio_file = None
    if st.session_state.get('enable_audio', True):
        tts_message = message
        audio_file = await async_edge_tts_generate(tts_message, voice, username)
    log_action(username, "chat", {"message": message})
    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:
        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

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 = get_current_time_str()
    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", WORLD_STATE_FILE]
    if exclude_files:
        protected.extend(exclude_files)
    deleted_count = 0
    errors = 0
    for pattern in file_patterns:
        pattern_path = pattern
        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) if errors > 0 else st.success(msg) if deleted_count > 0 else st.info("No matching files found to delete.")
    st.session_state['download_link_cache'] = {}
    st.session_state['audio_cache'] = {}

async def save_pasted_image(image, username):
    if not image:
        return None
    try:
        img_hash = hashlib.md5(image.tobytes()).hexdigest()[:8]
        timestamp = get_current_time_str()
        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
    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"):
        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 pasted_img

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")
    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:
                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}")

        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}")

        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
            time.sleep(0.5)
        progress_bar.progress(1.0, text="Processing complete.")

        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)

# ==============================================================================
# Streamlit UI Layout Functions
# ==============================================================================

def render_sidebar():
    with st.sidebar:
        st.header("💾 World State")
        st.caption("Manage the shared world state.")

        state = read_history_file()
        players = state.get("players", {})
        st.subheader("Active Players")
        current_time = time.time()
        for username, data in players.items():
            last_action = data.get("last_action_timestamp", 0)
            minutes_ago = (current_time - last_action) / 60
            st.write(f"{username}: Last active {minutes_ago:.1f} minutes ago")

        st.markdown("---")
        st.header("🏗️ Build Tools")
        st.caption("Select an object to place.")

        # CSS for tool buttons
        st.markdown("""
        <style>
            .tool-button {
                width: 40px;
                height: 40px;
                margin: 2px;
                font-size: 20px;
                cursor: pointer;
                border: 2px solid #ccc;
                background-color: #f9f9f9;
            }
            .tool-button:hover {
                background-color: #e0e0e0;
            }
            .tool-button.selected {
                border-color: #007bff;
                background-color: #e7f3ff;
            }
            .tool-grid {
                display: grid;
                grid-template-columns: repeat(5, 1fr);
                gap: 2px;
            }
        </style>
        """, unsafe_allow_html=True)

        # Tool buttons
        current_tool = st.session_state.get('selected_object', 'None')
        cols = st.columns(5)
        col_idx = 0
        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.selected_object != name:
                    st.session_state.selected_object = name
                    update_player_state(st.session_state.username)
                    st.rerun()
            col_idx += 1
        st.markdown("---")
        if st.button("🚫 Clear Tool", key="clear_tool", use_container_width=True):
            if st.session_state.selected_object != 'None':
                st.session_state.selected_object = 'None'
                update_player_state(st.session_state.username)
                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
            state = read_history_file()
            if old_username in state["players"]:
                state["players"][new_username] = state["players"].pop(old_username)
                write_history_file(state)
            st.session_state.username = new_username
            st.session_state.tts_voice = FUN_USERNAMES[new_username]
            save_username(st.session_state.username)
            update_player_state(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():
    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"])

    with tab_world:
        st.header("Shared 3D World")
        st.caption("Click to place objects with the selected tool, or click to move player. Right-click to delete. State is saved in history.json.")
        state = read_history_file()
        st.session_state.world_state = state
        html_file_path = 'index.html'
        try:
            with open(html_file_path, 'r', encoding='utf-8') as f:
                html_template = f.read()
            js_injection_script = f"""<script>
    window.USERNAME = {json.dumps(st.session_state.username)};
    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)};
    window.WORLD_STATE = {json.dumps(state)};
    console.log("Streamlit State Injected:", {{ username: window.USERNAME, selectedObject: window.SELECTED_OBJECT_TYPE, worldState: window.WORLD_STATE }});
</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)
            handle_js_messages()
        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)

    with tab_chat:
        st.header(f"{START_ROOM} Chat")
        chat_history_task = asyncio.run(load_chat_history())
        chat_container = st.container(height=500)
        with chat_container:
            if chat_history_task:
                st.markdown("----\n".join(reversed(chat_history_task[-50:])))
            else:
                st.caption("No chat messages yet.")

        message_value = st.text_input("Your Message:", key=f"message_input_{st.session_state.get('message_counter', 0)}", 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")
                asyncio.run(save_chat_entry(st.session_state.username, message_to_send, voice))
                update_player_state(st.session_state.username)
                st.session_state.message_counter = st.session_state.get('message_counter', 0) + 1
                st.rerun()
            elif send_button_clicked:
                st.toast("Message empty or same as last.")
        st.checkbox("Autosend Chat", key="autosend")

    with tab_files:
        st.header("📂 Files & Settings")
        st.subheader("💾 World State Management")
        if st.button("Clear World State", key="clear_world_state"):
            state = {"objects": {}, "players": {}}
            write_history_file(state)
            st.session_state.world_state = state
            st.success("World state cleared!")
            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([WORLD_STATE_FILE], "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:
            st.caption("No zip archives found.")

# ==============================================================================
# Main Execution Logic
# ==============================================================================

if __name__ == "__main__":
    init_session_state()
    render_sidebar()
    render_main_content()