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from __future__ import annotations
from . import __version__ as version
from typing import Iterable, Tuple, Optional
import streamlit as st
import streamlit.components.v1 as components

import matplotlib.pyplot as plt
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib import colors as mcolors
import tempfile
import os
from PIL import Image
import numpy as np
import time
from datetime import datetime

from .generator import generate_puzzle, sort_word_file
from .logic import build_letter_map, reveal_cell, guess_word, is_game_over, compute_tier, auto_mark_completed_words, hidden_word_display
from .models import Coord, GameState, Puzzle
from .word_loader import get_wordlist_files, load_word_list, compute_word_difficulties
from .version_info import versions_html  # version info footer
from .audio import (
    _get_music_dir,
    get_audio_tracks,
    _load_audio_data_url,
    _mount_background_audio,
    _inject_audio_control_sync,
    play_sound_effect,
)
from .game_storage import load_game_from_sid, save_game_to_hf, get_shareable_url, add_user_result_to_game

st.set_page_config(initial_sidebar_state="collapsed")

# PWA (Progressive Web App) Support
# Enables installing BattleWords as a native-feeling mobile app
# Note: PWA meta tags are injected into <head> via Docker build (inject-pwa-head.sh)
# This ensures proper PWA detection by browsers
pwa_service_worker = """
<script>
// Register service worker for offline functionality
// Note: Using inline Blob URL to bypass Streamlit's text/plain content-type for .js files
if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    // Service worker code as string (inline to avoid MIME type issues)
    const swCode = `
const CACHE_NAME = 'battlewords-v0.2.29';
const RUNTIME_CACHE = 'battlewords-runtime';

const PRECACHE_URLS = [
  '/',
  '/app/static/manifest.json',
  '/app/static/icon-192.png',
  '/app/static/icon-512.png'
];

self.addEventListener('install', event => {
  console.log('[ServiceWorker] Installing...');
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        console.log('[ServiceWorker] Precaching app shell');
        return cache.addAll(PRECACHE_URLS);
      })
      .then(() => self.skipWaiting())
  );
});

self.addEventListener('activate', event => {
  console.log('[ServiceWorker] Activating...');
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames.map(cacheName => {
          if (cacheName !== CACHE_NAME && cacheName !== RUNTIME_CACHE) {
            console.log('[ServiceWorker] Deleting old cache:', cacheName);
            return caches.delete(cacheName);
          }
        })
      );
    }).then(() => self.clients.claim())
  );
});

self.addEventListener('fetch', event => {
  if (event.request.method !== 'GET') return;
  if (!event.request.url.startsWith('http')) return;

  event.respondWith(
    caches.open(RUNTIME_CACHE).then(cache => {
      return fetch(event.request)
        .then(response => {
          if (response.status === 200) {
            cache.put(event.request, response.clone());
          }
          return response;
        })
        .catch(() => {
          return caches.match(event.request).then(cachedResponse => {
            if (cachedResponse) {
              console.log('[ServiceWorker] Serving from cache:', event.request.url);
              return cachedResponse;
            }
            return new Response('Offline - Please check your connection', {
              status: 503,
              statusText: 'Service Unavailable',
              headers: new Headers({'Content-Type': 'text/plain'})
            });
          });
        });
    })
  );
});

self.addEventListener('message', event => {
  if (event.data.action === 'skipWaiting') {
    self.skipWaiting();
  }
});
`;

    // Create Blob URL for service worker
    const blob = new Blob([swCode], { type: 'application/javascript' });
    const swUrl = URL.createObjectURL(blob);

    navigator.serviceWorker.register(swUrl)
      .then(registration => {
        console.log('[PWA] Service Worker registered successfully:', registration.scope);

        registration.addEventListener('updatefound', () => {
          const newWorker = registration.installing;
          newWorker.addEventListener('statechange', () => {
            if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
              console.log('[PWA] New version available! Refresh to update.');
            }
          });
        });
      })
      .catch(error => {
        console.log('[PWA] Service Worker registration failed:', error);
      });
  });
}

// Prompt user to install PWA (for browsers that support it)
let deferredPrompt;
window.addEventListener('beforeinstallprompt', (e) => {
  console.log('[PWA] Install prompt available');
  e.preventDefault();
  deferredPrompt = e;
  // Could show custom install button here if desired
});

// Track when user installs the app
window.addEventListener('appinstalled', () => {
  console.log('[PWA] BattleWords installed successfully!');
  deferredPrompt = null;
});
</script>
"""

CoordLike = Tuple[int, int]

def fig_to_pil_rgba(fig):
    canvas = FigureCanvas(fig)
    canvas.draw()
    w, h = fig.canvas.get_width_height()
    img = np.frombuffer(canvas.buffer_rgba(), dtype=np.uint8).reshape(h, w, 4)
    return Image.fromarray(img, mode="RGBA")

def _coord_to_xy(c) -> CoordLike:
    # Supports dataclass Coord(x, y) or a 2-tuple/list.
    if hasattr(c, "x") and hasattr(c, "y"):
        return int(c.x), int(c.y)
    if isinstance(c, (tuple, list)) and len(c) == 2:
        return int(c[0]), int(c[1])
    raise TypeError(f"Unsupported Coord type: {type(c)!r}")


def _normalize_revealed(revealed: Iterable) -> set[CoordLike]:
    return {(_coord_to_xy(c) if not (isinstance(c, tuple) and len(c) == 2 and isinstance(c[0], int)) else c) for c in revealed}


def _build_letter_map(puzzle) -> dict[CoordLike, str]:
    letters: dict[CoordLike, str] = {}
    for w in getattr(puzzle, "words", []):
        text = getattr(w, "text", "")
        cells = getattr(w, "cells", [])
        for i, c in enumerate(cells):
            xy = _coord_to_xy(c)
            if 0 <= i < len(text):
                letters[xy] = text[i]
    return letters

ocean_background_css = """
<style>
:root {
  --water-deep: #0b2a4a;
  --water-mid:  #0f3968;
  --water-lite: #165ba8;
  --water-sky:  #1d64c8;
  --foam:       rgba(255,255,255,0.18);
}

.stAppHeader{
    opacity:0.6;
}

.stApp {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;  /* prevent scrollbars from animated layers */
  background-attachment: scroll;
  position: relative;

  /* Static base gradient */
  background-image:
    linear-gradient(180deg, var(--water-sky) 0%, var(--water-lite) 35%, var(--water-mid) 70%, var(--water-deep) 100%);
  background-size: 100% 100%;
  background-position: 50% 50%;

  animation: none !important;
  will-change: background-position;
}

/* Animated overlay waves (under bg layers) */
.stApp::before {
  content: "";
  position: absolute;
  inset: -10% -10%;
  z-index: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.10) 0 2px, transparent 2px 22px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.06) 0 1px, transparent 1px 18px);
  mix-blend-mode: screen;
  opacity: 0.10;
  /*animation: waveOverlayScroll 16s linear infinite;*/
}
.stIFrame {
    margin-bottom:25px;
}

@keyframes waveOverlayScroll {
  0%   { background-position:   0px   0px,   0px   0px; }
  100% { background-position: -800px   0px,   0px -600px; }
}

/* Keep Streamlit content above background/overlay */
.stApp > div { position: relative; z-index: 5; }

/* Slower, more subtle animations */
@keyframes oceanHighlight {
  0%   { background-position: 50% 0%; }
  50%  { background-position: 60% 8%; }
  100% { background-position: 50% 0%; }
}

@keyframes oceanLong {
  0%   { background-position: 0% 50%; }
  100% { background-position: -100% 50%; }
}

@keyframes oceanMid {
  0%   { background-position: 100% 50%; }
  100% { background-position: 200% 50%; }
}

@keyframes oceanFine {
  0%   { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .stApp, .stApp::before { animation: none; }
}
</style>
"""

def inject_ocean_layers() -> None:
    st.markdown(
        """
        <style>
          .bw-bg-container {
            position: fixed;     /* fixed to viewport, not stApp */
            inset: 0;
            z-index: 1;          /* below content (z=5) but above ::before (z=0) */
            pointer-events: none;
            overflow: hidden;    /* clip children */
          }
          .bw-bg-layer {
            position: absolute;
            inset: 0;
            width: 100vw;
            height: 100vh;
            pointer-events: none;
          }
          /* Explicit stacking order with slower animations */
          .bw-bg-highlight { 
            z-index: 11; 
            background: radial-gradient(150% 100% at 50% -20%, rgba(255,255,255,0.10) 0%, transparent 60%); 
            background-size: 150% 150%;  /* reduced from 300% */
            /* animation: oceanHighlight 12s ease-in-out infinite; */ /* doubled from 6s */
          }
          .bw-bg-long { 
            z-index: 12; 
            background: repeating-linear-gradient(-6deg, rgba(255,255,255,0.08) 0px, rgba(255,255,255,0.08) 18px, rgba(0,0,0,0.04) 18px, rgba(0,0,0,0.04) 48px); 
            background-size: 150% 150%;  /* reduced from 320% */
            /* animation: oceanLong 36s linear infinite; */  /* doubled from 18s */
            opacity: 0.2; 
          }
          .bw-bg-mid { 
            z-index: 13; 
            background: repeating-linear-gradient(-12deg, rgba(255,255,255,0.10) 0px, rgba(255,255,255,0.10) 10px, rgba(0,0,0,0.05) 10px, rgba(0,0,0,0.05) 26px); 
            background-size: 150% 150%;  /* reduced from 260% */
            /* animation: oceanMid 24s linear infinite; */  /* doubled from 12s */
            opacity: 0.2; 
          }
          .bw-bg-fine { 
            z-index: 14; 
            background: repeating-linear-gradient(-18deg, var(--foam) 0px, var(--foam) 4px, transparent 4px, transparent 12px); 
            background-size: 120% 120%;  /* reduced from 200% */
            animation: oceanFine 14s linear infinite;  /* doubled from 7s */
            opacity: 0.15; 
          }
        </style>
        <div class="bw-bg-container">
          <div class="bw-bg-layer bw-bg-highlight"></div>
          <div class="bw-bg-layer bw-bg-long"></div>
          <div class="bw-bg-layer bw-bg-mid"></div>
          <div class="bw-bg-layer bw-bg-fine"></div>
        </div>
        """,
        unsafe_allow_html=True,
    )

def inject_styles() -> None:
    st.markdown(
        """
        <style>
            /* Center main content and limit width */
            # .stApp, body {
            #     background: rgba(29, 100, 200, 0.5);
            # }
           .stMainBlockContainer {
            max-width: 1100px;
           }
           .stHeading {
                margin-bottom: -1.5rem !important;
                margin-top: -1.5rem !important;
                # font-size: 1.75rem !important; /* Title */
                line-height: 1.1 !important;
           }
          /* Base grid cell visuals */
          .bw-row { display: flex; gap: 0.1rem; flex-wrap: nowrap; min-height: 48px;}
          .bw-cell {
            width: 100%;
            gap: 0.1rem;
            aspect-ratio: 1 / 1;
            line-height: 1.6;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #1d64c8;
            border-radius: 0;
            font-weight: 700;
            user-select: none;
            padding: 0.5rem 0.75rem;
            font-size: 1.4rem;
            min-height: 2.5rem;
            min-width: 1.25em;
            transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
            background: #1d64c8;   /* Base cell color */
            color: #FFFFFF;         /* Base text color for contrast */
          }
          /* Found letter cells */
          .bw-cell.letter { background: #d7faff; color: #050057; }
          /* Optional empty state if ever used */
          .bw-cell.empty  { background: #3a3a3a; color: #ffffff;}
          /* Completed word cells */
          .bw-cell.bw-cell-complete { background: #050057 !important; color: #d7faff !important; }

          /* Final score style */
          .bw-final-score { color: #1ca41c !important; font-weight: 800; }
          .stExpander {z-index: 10;width: 50%;}
          div[data-testid="stToastContainer"], div[data-testid="stToast"] {
            margin: 0 auto;
          }

          /* Make grid buttons square and fill their column */
          div[data-testid="stButton"]{
            margin: 0 auto;
            text-align: center;
          }
          div[data-testid="stButton"] button { max-width: 100%; aspect-ratio: 1 / 1; border-radius: 0; background: #1d64c8; color: #ffffff; font-weight: 700; padding: 0.5rem 0.75rem; min-height: 2.5rem; min-width: 2.5rem;}
          .st-key-new_game_btn, .st-key-sort_wordlist_btn { margin: 0 auto; aspect-ratio: unset; }
          .st-key-new_game_btn > div[data-testid="stButton"] button, .st-key-sort_wordlist_btn > div[data-testid="stButton"] button { aspect-ratio: unset; text-align:center; height: auto;}

          div[data-testid="column"], .st-emotion-cache-zh2fnc { width: auto !important; flex: 1 1 auto !important; min-width: 100% !important; max-width: 100% !important; }
          .st-emotion-cache-1permvm, .st-emotion-cache-1n6tfoc { gap:0.15rem !important; min-height: 2.5rem; min-width: 2.5rem;}          

          .bw-grid-row-anchor + div[data-testid="stHorizontalBlock"] { flex-wrap: nowrap !important; overflow-x: auto !important; margin: 2px 0 !important; }
          .bw-grid-row-anchor + div[data-testid="stHorizontalBlock"] > div[data-testid="column"] { flex: 0 0 auto !important; }
          .bw-grid-row-anchor { height: 0; margin: 0; padding: 0; }
          .st-emotion-cache-1n6tfoc { background: linear-gradient(-45deg, #a1a1a1, #ffffff, #a1a1a1, #666666); gap: 0.1rem !important; color: white; border-radius:15px; padding: 10px 10px 10px 5px; }
          .st-emotion-cache-1n6tfoc::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; border-radius: 10px; margin: 5px;}
          .st-key-guess_input, .st-key-guess_submit { flex-direction: row; display: flex; flex-wrap: wrap; justify-content: flex-start; align-items: flex-end; }

          /* grid adjustments */
          @media (min-width: 560px){
           div[data-testid="stButton"] button { max-width: 100%; aspect-ratio: 1 / 1; min-height: calc(100% + 20px) !important;}           
           .st-key-new_game_btn > div[data-testid="stButton"] button, .st-key-sort_wordlist_btn > div[data-testid="stButton"] button { min-height: calc(100% + 20px) !important;}
           .st-emotion-cache-ckafi0 { gap:0.1rem !important; min-height: calc(100% + 20px) !important; aspect-ratio: 1 / 1; width: auto !important;  flex: 1 1 auto !important;  min-width: 100% !important;  max-width: 100% !important;}
           /*.st-emotion-cache-1n6tfoc { aspect-ratio: 1 / 1; min-height: calc(100% + 20px) !important;}*/
           .st-emotion-cache-1n6tfoc::before { min-height: calc(100% + 20px) !important; }

          }
          div[data-testid="stElementToolbarButtonContainer"], button[data-testid="stBaseButton-elementToolbar"], button[data-testid="stBaseButton-elementToolbar"]:hover {
               display: none;
          }

          /* Mobile styles */
          @media (max-width: 640px) {
            .bw-cell, div[data-testid="stButton"] button, .st-emotion-cache-1permvm {min-width: 1.5rem; min-height:40px;}
            #bw-main-anchor + div[data-testid="stHorizontalBlock"] { flex-direction: column-reverse !important; width: 100% !important; max-width: 100vw !important; }
            #bw-main-anchor + div[data-testid="stHorizontalBlock"] > div[data-testid="column"] { width: 100% !important; min-width: 100% !important; max-width: 100% !important; flex: 1 1 100% !important; }
            .bw-grid-row-anchor + div[data-testid="stHorizontalBlock"] { flex-wrap: nowrap !important; overflow-x: auto !important; margin: 2px 0 !important; }
            .st-emotion-cache-17i4tbh { min-width: calc(8.33333% - 1rem); }
          }

          .bold-text { font-weight: 700; }
          .blue-background { background:#1d64c8; opacity:0.9; }
          .metal-border { position: relative; padding: 20px; background: #333; color: white; border: 4px solid; border-image: linear-gradient(45deg, #a1a1a1, #ffffff, #a1a1a1, #666666) 1; border-radius: 8px; }
          .shiny-border { position: relative; padding: 12px; background: #333; color: white; border-radius: 1.25rem; overflow: hidden; }
          .shiny-border::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent); transition: left 0.5s; }
          .bw-score-panel-container { height: 100%; overflow: hidden; text-align:center;}
          .bw-score-panel-container table tbody tr h3 {display: flex;flex-direction: row;justify-content: space-evenly;flex-wrap: wrap;}
          .shiny-border:hover::before { left: 100%; }

          .bw-radio-group { display:flex; align-items:flex-start; gap: 10px; flex-flow: row; }
          .bw-radio-item { display:flex; flex-direction:column; align-items:center; gap:6px; text-align:center;}
          .bw-radio-circle { width: 45px; height: 45px; border-radius: 50%; border: 4px solid; background: rgba(255,255,255,0.06); display: grid; place-items: center; color:#fff; font-weight:700; }
          .bw-radio-circle .dot { width: 14px; height: 14px; border-radius: 50%; background:#777; box-shadow: inset 0 0 0 2px rgba(255,255,255,0.25); }
          .bw-radio-circle.active.hit { background: linear-gradient(135deg, rgba(0,255,127,0.18), rgba(0,128,64,0.38)); }
          .bw-radio-circle.active.hit .dot { background:#20d46c; box-shadow: 0 0 10px rgba(32,212,108,0.85); }
          .bw-radio-circle.active.miss { background: linear-gradient(135deg, rgba(255,0,0,0.18), rgba(128,0,0,0.38)); }
          .bw-radio-circle.active.miss .dot { background:#ff4b4b; box-shadow: 0 0 10px rgba(255,75,75,0.85); }
          .bw-radio-caption { font-size: 0.8rem; color:#fff; opacity:0.85; letter-spacing:0.5px; }
          @media (max-width:1000px) and (min-width:641px) {
            .bw-radio-group { flex-wrap:wrap; gap: 5px; margin-bottom: 5px;}
            .bw-radio-item {margin: 0 auto;}
          }
          @media (max-width:640px) {
            .bw-radio-item { margin:unset;}
          }

          /* Make the sidebar scrollable */
          section[data-testid="stSidebar"] {
              max-height: 100vh;
              overflow-y: auto;
              overflow-x: hidden;
              scrollbar-width: thin;
              scrollbar-color: transparent transparent;
              opacity:0.75;
          }

         .st-emotion-cache-wp60of {
             width: 720px;
             position: absolute;     
             max-width:100%;
          }
         .stImage {max-width:300px;}
         [id^="text_input"] {
          background-color:#fff;
          color:#000;
          caret-color:#333;}
        
         @media (min-width:720px) {         
          .st-emotion-cache-wp60of {
            left: calc(calc(100% - 720px) / 2);
          }
         }

          /* Helper to absolutely/fixed position Streamlit component wrapper when showing modal */
          .bw-component-abs { position: fixed !important; inset: 0 !important; z-index: 99999 !important; width: 100vw !important; height: 100vh !important; margin: 0 !important; padding: 0 !important; }
          /* Generic hide utility */
          .hide { display: none !important; pointer-events: none !important; }
        </style>
        """,
        unsafe_allow_html=True,
    )

def _init_session() -> None:
    if "initialized" in st.session_state and st.session_state.initialized:
        return
    # --- Preserve music settings ---

    # Check if we're loading a shared game
    shared_settings = st.session_state.get("shared_game_settings")

    # Ensure a default selection exists before creating the puzzle
    files = get_wordlist_files()
    if "selected_wordlist" not in st.session_state and files:
        st.session_state.selected_wordlist = "classic.txt"
    if "game_mode" not in st.session_state:
        st.session_state.game_mode = "classic"

    # Generate puzzle with shared game settings if available
    if shared_settings:
        # Each user gets different random words from the same wordlist source
        wordlist_source = shared_settings.get("wordlist_source", "classic.txt")
        spacer = shared_settings["puzzle_options"].get("spacer", 1)
        may_overlap = shared_settings["puzzle_options"].get("may_overlap", False)
        game_mode = shared_settings.get("game_mode", "classic")

        # Override selected wordlist to match challenge
        st.session_state.selected_wordlist = wordlist_source

        # Generate puzzle with random words from the challenge's wordlist
        words = load_word_list(wordlist_source)
        puzzle = generate_puzzle(
            grid_size=12,
            words_by_len=words,
            spacer=spacer,
            may_overlap=may_overlap
        )
        st.session_state.game_mode = game_mode
        st.session_state.spacer = spacer

        # Users will see leaderboard showing all players' results
        # Each player has their own uid and word_list in the users array
    else:
        # Normal game generation
        words = load_word_list(st.session_state.get("selected_wordlist"))
        puzzle = generate_puzzle(grid_size=12, words_by_len=words)

    st.session_state.puzzle = puzzle
    st.session_state.grid_size = 12
    st.session_state.revealed = set()
    st.session_state.guessed = set()
    st.session_state.score = 0
    st.session_state.last_action = "Welcome to Battlewords! Reveal a cell to begin."
    st.session_state.can_guess = False
    st.session_state.points_by_word = {}
    st.session_state.letter_map = build_letter_map(puzzle)
    st.session_state.initialized = True
    st.session_state.radar_gif_path = None
    st.session_state.start_time = datetime.now()  # Set timer on first game
    st.session_state.end_time = None
    # Ensure game_mode is set
    if "game_mode" not in st.session_state:
        st.session_state.game_mode = "classic"
    # Initialize incorrect guesses tracking
    if "incorrect_guesses" not in st.session_state:
        st.session_state.incorrect_guesses = []
    # Initialize show_incorrect_guesses to True by default
    if "show_incorrect_guesses" not in st.session_state:
        st.session_state.show_incorrect_guesses = True

    # NEW: Initialize Show Challenge Share Links (default OFF)
    if "show_challenge_share_links" not in st.session_state:
        st.session_state.show_challenge_share_links = False

def _new_game() -> None:
 selected = st.session_state.get("selected_wordlist")
 mode = st.session_state.get("game_mode")
 show_grid_ticks = st.session_state.get("show_grid_ticks", False)
 spacer = st.session_state.get("spacer",1)
 show_incorrect_guesses = st.session_state.get("show_incorrect_guesses", False)
 # --- Preserve music and effects settings ---
 music_enabled = st.session_state.get("music_enabled", False)
 music_track_path = st.session_state.get("music_track_path")
 music_volume = st.session_state.get("music_volume",15)
 effects_volume = st.session_state.get("effects_volume",25)
 enable_sound_effects = st.session_state.get("enable_sound_effects", True)
 # NEW: Preserve Show Challenge Share Links
 show_challenge_share_links = st.session_state.get("show_challenge_share_links", False)

 st.session_state.clear()
 if selected:
    st.session_state.selected_wordlist = selected
 if mode:
    st.session_state.game_mode = mode
 st.session_state.show_grid_ticks = show_grid_ticks
 st.session_state.spacer = spacer
 st.session_state.show_incorrect_guesses = show_incorrect_guesses
 # --- Restore music/effects settings ---
 st.session_state.music_enabled = music_enabled
 if music_track_path:
    st.session_state.music_track_path = music_track_path
 st.session_state.music_volume = music_volume
 st.session_state.effects_volume = effects_volume
 st.session_state.enable_sound_effects = enable_sound_effects
 # NEW: Restore Show Challenge Share Links
 st.session_state.show_challenge_share_links = show_challenge_share_links

 st.session_state.radar_gif_path = None
 st.session_state.radar_gif_signature = None
 st.session_state.start_time = datetime.now() # Reset timer on new game
 st.session_state.end_time = None
 st.session_state.incorrect_guesses = [] # Clear incorrect guesses for new game
 _init_session()


def _to_state() -> GameState:
    return GameState(
        grid_size=st.session_state.grid_size,
        puzzle=st.session_state.puzzle,
        revealed=st.session_state.revealed,
        guessed=st.session_state.guessed,
        score=st.session_state.score,
        last_action=st.session_state.last_action,
        can_guess=st.session_state.can_guess,
        game_mode=st.session_state.get("game_mode", "classic"),
        points_by_word=st.session_state.points_by_word,
        start_time=st.session_state.get("start_time"),
        end_time=st.session_state.get("end_time"),
    )


def _sync_back(state: GameState) -> None:
    st.session_state.revealed = state.revealed
    st.session_state.guessed = state.guessed
    st.session_state.score = state.score
    st.session_state.last_action = state.last_action
    st.session_state.can_guess = state.can_guess
    st.session_state.points_by_word = state.points_by_word


def _render_header():
    st.title(f"Battlewords v{version}")

    st.subheader("Reveal letters in cells, then guess the words!")

    # Only show Challenge Mode expander if in challenge mode and game_id is present
    params = st.query_params if hasattr(st, "query_params") else {}
    is_challenge_mode = "shared_game_settings" in st.session_state and "game_id" in params

    if is_challenge_mode:
        with st.expander("🎯 Challenge Mode (click to expand/collapse)", expanded=True):
            shared_settings = st.session_state.get("shared_game_settings")
            if shared_settings:
                users = shared_settings.get("users", [])

                if users:
                    # Sort users by score (descending), then by time (ascending), then by difficulty (descending)
                    def leaderboard_sort_key(u):
                        # Use -score for descending, time for ascending, -difficulty for descending (default 0 if missing)
                        diff = u.get("word_list_difficulty", 0)
                        return (-u["score"], u["time"], -diff)

                    sorted_users = sorted(users, key=leaderboard_sort_key)
                    best_user = sorted_users[0]
                    best_score = best_user["score"]
                    best_time = best_user["time"]
                    mins, secs = divmod(best_time, 60)
                    best_time_str = f"{mins:02d}:{secs:02d}"

                    # Build leaderboard HTML
                    leaderboard_rows = []
                    for i, user in enumerate(sorted_users[:5], 1):  # Top 5
                        u_mins, u_secs = divmod(user["time"], 60)
                        u_time_str = f"{u_mins:02d}:{u_secs:02d}"
                        medal = ["🥇", "🥈", "🥉"][i-1] if i <= 3 else f"{i}."
                        # show optional difficulty if present
                        diff_str = ""
                        if "word_list_difficulty" in user:
                            try:
                                diff_str = f" • diff {float(user['word_list_difficulty']):.2f}"
                            except Exception:
                                diff_str = ""
                        leaderboard_rows.append(
                            f"<div style='padding:0.25rem; font-size:0.85rem;'>{medal} {user['username']}: {user['score']} pts in {u_time_str}{diff_str}</div>"
                        )
                    leaderboard_html = "".join(leaderboard_rows)

                    # Get the challenge SID from session state
                    sid = st.session_state.get("loaded_game_sid")
                    share_html = ""
                    # NEW: Only render share link when setting enabled
                    if sid and st.session_state.get("show_challenge_share_links", False):
                        share_url = get_shareable_url(sid)
                        share_html = f"<div style='margin-top:1rem;margin-bottom:0.5rem;font-size: 0.9rem;'><a href='{share_url}' target='_blank' style='color:#FFF;text-decoration:underline;'><strong>🔗 Share this challenge</a></strong<br/><br/><span style='font-size:0.85em;color:#ddd;'>{share_url}</span>"

                    st.markdown(
                        f"""
                        <div style="
                            background: linear-gradient(90deg, #1d64c8 0%, #165ba8 100%);
                            color: white;
                            padding: 1rem;
                            border-radius: 0.5rem;
                            margin-bottom: 1rem;
                            text-align: center;
                            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
                        ">
                            🎯 <strong>CHALLENGE MODE</strong> 🎯<br/>
                            <span style="font-size: 0.9rem;">
                                Beat the best: <strong>{best_score} points</strong> in <strong>{best_time_str}</strong> by <strong>{best_user['username']}</strong>
                            </span>
                            <div style="margin-top:0.75rem; border-top: 1px solid rgba(255,255,255,0.3); padding-top:0.5rem;">
                                <strong style="font-size:0.9rem;">🏆 Leaderboard</strong>
                                {leaderboard_html}
                            </div>
                            {share_html}
                        </div>
                        """,
                        unsafe_allow_html=True
                    )
                else:
                    st.markdown(
                        """
                        <div style="
                            background: linear-gradient(90deg, #1d64c8 0%, #165ba8 100%);
                            color: white;
                            padding: 1rem;
                            border-radius: 0.5rem;
                            margin-bottom: 1rem;
                            text-align: center;
                            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
                        ">
                            🎯 <strong>CHALLENGE MODE</strong> 🎯<br/>
                            <span style="font-size: 0.9rem;">
                                Be the first to complete this challenge!
                            </span>
                        </div>
                        """,
                        unsafe_allow_html=True
                    )


    inject_styles()

def _render_sidebar():
    with st.sidebar:
        st.header("SETTINGS")        

        st.header("Game Mode")
        game_modes = ["classic", "too easy"]
        default_mode = "classic"
        if "game_mode" not in st.session_state:
            st.session_state.game_mode = default_mode
        current_mode = st.session_state.game_mode
        st.selectbox(
            "Select game mode",
            options=game_modes,
            index=game_modes.index(current_mode) if current_mode in game_modes else 0,
            key="game_mode",
            on_change=_on_game_option_change,  # was _new_game
        )

        st.header("Wordlist Controls")
        wordlist_files = get_wordlist_files()

        if wordlist_files:
            # Ensure current selection is valid
            if st.session_state.get("selected_wordlist") not in wordlist_files:
                st.session_state.selected_wordlist = wordlist_files[0]

            # Use filenames as options, show without extension
            current_index = wordlist_files.index(st.session_state.selected_wordlist)
            st.selectbox(
                "Select list",
                options=wordlist_files,
                index=current_index,
                format_func=lambda f: f.rsplit(".", 1)[0],
                key="selected_wordlist",
                on_change=_on_game_option_change,  # was _new_game
            )

            if st.button("Sort Wordlist", width=125, key="sort_wordlist_btn"):
                _sort_wordlist(st.session_state.selected_wordlist)
        else:
            st.info("No word lists found in words/ directory. Using built-in fallback.")
        
        # Add Show Grid ticks option
        if "show_grid_ticks" not in st.session_state:
            st.session_state.show_grid_ticks = False
        st.checkbox("Show Grid ticks", value=st.session_state.show_grid_ticks, key="show_grid_ticks")
        
        # Add Spacer option
        spacer_options = [0,1,2]
        if "spacer" not in st.session_state:
            st.session_state.spacer = 1
        st.selectbox(
            "Spacer (space between words)",
            options=spacer_options,
            index=spacer_options.index(st.session_state.spacer),
            key="spacer",
            on_change=_on_game_option_change,  # add callback
        )

        # Add Show Incorrect Guesses option - now enabled by default
        if "show_incorrect_guesses" not in st.session_state:
            st.session_state.show_incorrect_guesses = True
        st.checkbox("Show incorrect guesses", value=st.session_state.show_incorrect_guesses, key="show_incorrect_guesses")

        # NEW: Add Show Challenge Share Links option - default OFF
        if "show_challenge_share_links" not in st.session_state:
            st.session_state.show_challenge_share_links = False
        st.checkbox("Show Challenge Share Links", value=st.session_state.show_challenge_share_links, key="show_challenge_share_links")

        # Audio settings
        st.header("Audio")
        tracks = get_audio_tracks()
        st.caption(f"{len(tracks)} audio file{'s' if len(tracks) != 1 else ''} found in battlewords/assets/audio/music")

        if "music_enabled" not in st.session_state:
            st.session_state.music_enabled = False
        if "music_volume" not in st.session_state:
            st.session_state.music_volume = 15
        # --- Add sound effects volume ---
        if "effects_volume" not in st.session_state:
            st.session_state.effects_volume = 25
        # --- Add enable sound effects ---
        if "enable_sound_effects" not in st.session_state:
            st.session_state.enable_sound_effects = True
        st.checkbox("Enable Sound Effects", value=st.session_state.enable_sound_effects, key="enable_sound_effects")

        enabled = st.checkbox("Enable music", value=st.session_state.music_enabled, key="music_enabled")

        st.slider(
            "Volume",
        0,
        100,
         value=int(st.session_state.music_volume),
         step=1,
         key="music_volume",
         disabled=not (enabled and bool(tracks)),
         )

                # --- Add sound effects volume slider ---
        st.slider(
                    "Sound Effects Volume",
        0,
        100,
         value=int(st.session_state.effects_volume),
         step=1,
         key="effects_volume",
         )

        selected_path = None
        if tracks:
            options = [p for _, p in tracks]
            # Default to first track if none chosen yet
            if "music_track_path" not in st.session_state or st.session_state.music_track_path not in options:
                st.session_state.music_track_path = options[0]

            def _fmt(p: str) -> str:
                # Find friendly label for path
                for name, path in tracks:
                    if path == p:
                        return name
                return os.path.splitext(os.path.basename(p))[0]

            selected_path = st.selectbox(
                "Track",
                options=options,
                index=options.index(st.session_state.music_track_path),
                format_func=_fmt,
                key="music_track_path",
                disabled=not enabled,
            )
            src_url = _load_audio_data_url(selected_path) if enabled else None
            _mount_background_audio(enabled, src_url, (st.session_state.music_volume or 0) / 100)
        else:
            st.caption("Place .mp3 files in battlewords/assets/audio/music to enable music.")
            _mount_background_audio(False, None, 0.0)

        _inject_audio_control_sync()
        st.markdown(versions_html(), unsafe_allow_html=True)

def get_scope_image(uid: str, size=4, bgcolor="none", scope_color="green", img_name="scope_blue.png"):
    """
    Return a per-puzzle pre-rendered scope image by UID.
    1. Check for cached/generated image in temp dir.
    2. If not found, use assets/scope.gif.
    3. If neither exists, generate and save a new image.
    """
    base_dir = os.path.join(tempfile.gettempdir(), "battlewords_scopes")
    os.makedirs(base_dir, exist_ok=True)
    scope_path = os.path.join(base_dir, f"scope_{uid}.png")

    # 1. Use cached/generated image if it exists
    if os.path.exists(scope_path):
        return Image.open(scope_path)

    # 2. Fallback to assets/scope.gif if available
    assets_scope_path = os.path.join(os.path.dirname(__file__), "assets", img_name)
    if os.path.exists(assets_scope_path):
        return Image.open(assets_scope_path)

    # 3. Otherwise, generate and save a new image
    fig, ax = _create_radar_scope(size=size, bgcolor=bgcolor, scope_color=scope_color)
    imgscope = fig_to_pil_rgba(fig)
    imgscope.save(scope_path)
    plt.close(fig)
    return imgscope

def _create_radar_scope(size=4, bgcolor="none", scope_color="green"):
    fig, ax = plt.subplots(figsize=(size, size), dpi=144)
    ax.set_facecolor(bgcolor)
    fig.patch.set_alpha(0.5)
    ax.set_zorder(0)
    
    
    # Hide decorations but keep patch/frame on
    for spine in ax.spines.values():
        spine.set_visible(False)
    ax.set_xticks([])
    ax.set_yticks([])
    
    # Center lines
    ax.axhline(0, color=scope_color, alpha=0.8, zorder=1)
    ax.axvline(0, color=scope_color, alpha=0.8, zorder=1)
    # ax.set_xticks(range(1, size + 1))
    # ax.set_yticks(range(1, size + 1))
    
    # Circles at 25% and 50% radius
    for radius in [0.33, 0.66, 1.0]:
        circle = plt.Circle((0, 0), radius, fill=False, color=scope_color, alpha=0.8, zorder=1)
        ax.add_patch(circle)
    
    # Radial lines at 0, 30, 45, 90 degrees
    angles = [0, 30, 60, 120, 150, 210, 240, 300, 330]
    for angle in angles:
        rad = np.deg2rad(angle)
        x = np.cos(rad)
        y = np.sin(rad)
        ax.plot([0, x], [0, y], color=scope_color, alpha=0.5, zorder=1)
    
    # Set limits and remove axes
    ax.set_xlim(-0.5, 0.5)
    ax.set_ylim(-0.5, 0.5)
    ax.set_aspect('equal', adjustable='box')
    ax.axis('off')
    
    return fig, ax

def _render_radar(puzzle: Puzzle, size: int, r_max: float = 0.8, max_frames: int = 30, sinusoid_expand: bool = True, stagger_radar: bool = False, show_ticks: bool = True):
    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib.animation import FuncAnimation, PillowWriter
    from matplotlib.patches import Circle
    from matplotlib import colors as mcolors
    import tempfile
    import os

    xs = np.array([c.y + 1 for c in puzzle.radar])
    ys = np.array([c.x + 1 for c in puzzle.radar])
    n_points = len(xs)

    r_min = 0.15
    min_x = min(xs - 0.5) - r_max
    max_x = max(xs - 0.5) + r_max
    min_y = min(ys - 0.5) - r_max  # Note: ys are inverted in plot
    max_y = max(ys - 0.5) + r_max
    ring_linewidth = 3

    rgba_labels = mcolors.to_rgba("#FFFFFF", 0.7)
    rgba_ticks  = mcolors.to_rgba("#FFFFFF", 0.66) 
    bgcolor="#4b7bc4"
    scope_size=3
    scope_color="#ffffff"

    # Determine which rings correspond to already-guessed words (hide them)
    guessed_words = set(st.session_state.get("guessed", set()))
    guessed_by_index = [w.text in guessed_words for w in puzzle.words]

    # GIF cache signature: puzzle uid + guessed words snapshot
    gif_signature = (getattr(puzzle, "uid", None), tuple(sorted(guessed_words)))

    # Use per-puzzle scope image keyed by puzzle.uid
    imgscope = get_scope_image(uid=puzzle.uid, size=scope_size, bgcolor=bgcolor, scope_color=scope_color)

    # Build figure with explicit axes occupying full canvas to avoid browser-specific padding
    fig = plt.figure(figsize=(scope_size, scope_size), dpi=144)
    # Background gradient covering full figure
    bg_ax = fig.add_axes([0, 0, 1, 1], zorder=0)
    fig.canvas.draw()  # ensure size
    fig_w, fig_h = [int(v) for v in fig.canvas.get_width_height()]

    def _make_linear_gradient(width: int, height: int, angle_deg: float,
                              colors_hex: list[str], stops: list[float]) -> np.ndarray:
        yy, xx = np.meshgrid(np.linspace(0, 1, height), np.linspace(0, 1, width), indexing='ij')
        theta = np.deg2rad(angle_deg)
        proj = np.cos(theta) * xx + np.sin(theta) * yy
        corners = np.array([[0, 0], [1, 0], [0, 1], [1, 1]], dtype=float)
        pc = np.cos(theta) * corners[:, 0] + np.sin(theta) * corners[:, 1]
        proj = (proj - pc.min()) / (pc.max() - pc.min() + 1e-12)
        proj = np.clip(proj, 0.0, 1.0)

        stop_arr = np.asarray(stops, dtype=float)
        cols = np.asarray([mcolors.to_rgb(c) for c in colors_hex], dtype=float)

        j = np.clip(np.searchsorted(stop_arr, proj, side='right') - 1, 0, len(stop_arr) - 2)
        a = stop_arr[j]
        b = stop_arr[j + 1]
        w = ((proj - a) / (b - a + 1e-12))[..., None]
        c0 = cols[j]
        c1 = cols[j + 1]
        img = (1.0 - w) * c0 + w * c1
        return img

    grad_img = _make_linear_gradient(
        width=fig_w,
        height=fig_h,
        angle_deg=-45.0,
        colors_hex=['#a1a1a1', '#ffffff', '#a1a1a1', '#666666'],
        stops=[0.0, 1.0 / 3.0, 2.0 / 3.0, 1.0],
    )
    bg_ax.imshow(grad_img, aspect='auto', interpolation='bilinear')
    bg_ax.axis('off')

    # Decorative scope image as overlay (does not affect coordinates)
    scope_ax = fig.add_axes([0, 0, 1, 1], zorder=1)
    scope_ax.imshow(imgscope, aspect='auto', interpolation='lanczos')
    scope_ax.axis('off')

    # Main axes for rings and ticks with fixed limits to stabilize layout across browsers
    ax = fig.add_axes([0, 0, 1, 1], zorder=2)
    ax.set_facecolor('none')
    ax.set_xlim(0.5, size + 0.5)
    ax.set_ylim(size + 0.5, 0.5)  # Inverted for grid coordinates

    if show_ticks:
        ax.set_xticks(range(1, size + 1))
        ax.set_yticks(range(1, size + 1))
        ax.tick_params(axis="both", which="both", labelcolor=rgba_labels)
        ax.tick_params(axis="both", which="both", colors=rgba_ticks)
    else:
        ax.set_xticks([])
        ax.set_yticks([])

    ax.set_aspect('equal', adjustable='box')
    for spine in ax.spines.values():
        spine.set_visible(False)

    # Build rings centered on exact cell centers (integer coords)
    rings: list[Circle] = []
    for x, y in zip(xs, ys):
        ring = Circle((x, y), radius=r_min, fill=False, edgecolor='#9ceffe', linewidth=ring_linewidth, alpha=1.0, zorder=3)
        ax.add_patch(ring)
        rings.append(ring)

    def update(frame):
        # Hide rings for guessed words
        for idx, ring in enumerate(rings):
            ring.set_visible(not guessed_by_index[idx])
        if sinusoid_expand:
            phase = 2 * np.pi * frame / max_frames
            r = r_min + (r_max - r_min) * (0.5 + 0.5 * np.sin(phase))
            alpha = 0.5 + 0.5 * np.cos(phase)
            for idx, ring in enumerate(rings):
                if not guessed_by_index[idx]:
                    ring.set_radius(r)
                    ring.set_alpha(alpha)
        else:
            base_t = (frame % max_frames) / max_frames
            offset = max(1, max_frames // max(1, n_points)) if stagger_radar else 0
            for idx, ring in enumerate(rings):
                if guessed_by_index[idx]:
                    continue
                t_i = ((frame + idx * offset) % max_frames) / max_frames if stagger_radar else base_t
                r_i = r_min + (r_max - r_min) * t_i
                alpha_i = 1.0 - t_i
                ring.set_radius(r_i)
                ring.set_alpha(alpha_i)
        return rings

    # Use persistent GIF if available and matches current signature
    cached_path = st.session_state.get("radar_gif_path")
    cached_sig = st.session_state.get("radar_gif_signature")
    if cached_path and os.path.exists(cached_path) and cached_sig == gif_signature:
        with open(cached_path, "rb") as f:
            gif_bytes = f.read()
        st.image(gif_bytes, width='stretch',)
        plt.close(fig)
        return

    # Otherwise, generate and persist
    with tempfile.NamedTemporaryFile(suffix=".gif", delete=False) as tmpfile:
        ani = FuncAnimation(fig, update, frames=max_frames, interval=50, blit=True)
        ani.save(tmpfile.name, writer=PillowWriter(fps=20))
        plt.close(fig)
        tmpfile.seek(0)
        gif_bytes = tmpfile.read()
        st.session_state.radar_gif_path = tmpfile.name  # Save path for reuse
        st.session_state.radar_gif_signature = gif_signature  # Save signature to detect changes
    st.image(gif_bytes, width='stretch')

def _render_grid(state: GameState, letter_map, show_grid_ticks: bool = True):
    size = state.grid_size
    clicked: Optional[Coord] = None

    # Determine if the game is over to reveal all remaining tiles as blanks
    game_over = is_game_over(state)

    # Inject CSS for grid lines
    st.markdown(
        """
        <style>
        div[data-testid="column"] {
            padding: 0 !important;
        }
        button[data-testid="stButton"] {
            width: 32px !important;
            height: 32px !important;
            min-width: 32px !important;
            min-height: 32px !important;
            padding: 0 !important;
            margin: 0 !important;
            border: 1px solid #1d64c8 !important;
            border-radius: 0 !important;
            background: #1d64c8 !important;
            color: #ffffff !important;
            font-weight: bold;
            font-size: 1.4rem;
        }
        /* Further tighten vertical spacing between rows inside the grid container */
        .bw-grid-row-anchor + div[data-testid="stHorizontalBlock"] {
            margin: 2px 0 !important;
        }
        .st-emotion-cache-14d5v98 {
            position:relative;
        }
        .st-emotion-cache-7czcpc > img {
            border-radius: 1.25rem;
            max-width:300px !important;
            margin: 0 auto !important;
        }
        .st-emotion-cache-ig7yu6 {
            width: calc(30% - 1rem);
            flex: 1 1 calc(20% - 1rem);
        }
        @media (max-width: 640px) {
            .stImage {max-width:100%; width:100%;}
            .stImage img {max-width:360px !important; margin:0 auto;}
            .st-emotion-cache-p75nl5 {width:100%;}
            .st-emotion-cache-1s1xxaz {
                min-width: calc(33% - 1.5rem);
            }
            .st-emotion-cache-ig7yu6 {
                min-width: calc(30% - 1.5rem);
            }
            .st-emotion-cache-15oaysa, .st-emotion-cache-8ocv8  {
                min-width: calc(8.33333% - 1rem);
            }
        }
        </style>
        """,
        unsafe_allow_html=True,
    )

    grid_container = st.container()
    with grid_container:        
        for r in range(size):
            st.markdown('<div class="bw-grid-row-anchor"></div>', unsafe_allow_html=True)
            cols = st.columns(size, gap="small")
            for c in range(size):
                coord = Coord(r, c)
                # Treat all cells as revealed once the game is over
                revealed = (coord in state.revealed) or game_over
                label = letter_map.get(coord, " ") if revealed else " "

                is_completed_cell = False
                if revealed:
                    for w in state.puzzle.words:
                        if w.text in state.guessed and coord in w.cells:
                            is_completed_cell = True
                            break

                key = f"cell_{r}_{c}"
                tooltip = f"({r+1},{c+1})" if show_grid_ticks else ""

                if is_completed_cell:
                    safe_label = (label or " ")
                    if show_grid_ticks:
                        cols[c].markdown(
                            f'<div class="bw-cell bw-cell-complete" title="{tooltip}">{safe_label}</div>',
                            unsafe_allow_html=True,
                        )
                    else:
                        cols[c].markdown(
                            f'<div class="bw-cell bw-cell-complete">{safe_label}</div>',
                            unsafe_allow_html=True,
                        )
                elif revealed:
                    safe_label = (label or " ")
                    has_letter = safe_label.strip() != ""
                    cell_class = "letter" if has_letter else "empty"
                    display = safe_label if has_letter else "&nbsp;"
                    if show_grid_ticks:
                        cols[c].markdown(
                            f'<div class="bw-cell {cell_class}" title="{tooltip}">{display}</div>',
                            unsafe_allow_html=True,
                        )
                    else:
                        cols[c].markdown(
                            f'<div class="bw-cell {cell_class}">{display}</div>',
                            unsafe_allow_html=True,
                        )
                else:
                    # Unrevealed: render a button to allow click/reveal with tooltip
                    if show_grid_ticks:
                        if cols[c].button(" ", key=key, help=tooltip):
                            clicked = coord
                    else:
                        if cols[c].button(" ", key=key):
                            clicked = coord
        
    if clicked is not None:
        reveal_cell(state, letter_map, clicked)
        # Auto-mark and award base points for any fully revealed words
        if auto_mark_completed_words(state):
            # Invalidate radar GIF cache to hide completed rings
            st.session_state.radar_gif_path = None
            st.session_state.radar_gif_signature = None
        # Note: letter_map is static and built once in _init_session(), no need to rebuild
        _sync_back(state)

        # Play sound effect based on hit or miss
        action = (state.last_action or "").strip()
        if action.startswith("Revealed '"):
            play_sound_effect("hit", volume=(st.session_state.get("effects_volume", 50) / 100))
        elif action.startswith("Revealed empty"):
            play_sound_effect("miss", volume=(st.session_state.get("effects_volume", 50) / 100))

        st.rerun()

def _sort_wordlist(filename):
    import os
    import time  # Add this import

    WORDS_DIR = os.path.join(os.path.dirname(__file__), "words")
    filepath = os.path.join(WORDS_DIR, filename)
    sorted_words = sort_word_file(filepath)
    # Optionally, write sorted words back to file
    with open(filepath, "w", encoding="utf-8") as f:
        # Re-add header if needed
        f.write("# Optional: place a large A–Z word list here (one word per line).\n")
        f.write("# The app falls back to built-in pools if fewer than 500 words per length are found.\n")
        for word in sorted_words:
            f.write(f"{word}\n")
    # Show a message in Streamlit
    st.success(f"{filename} sorted by length and alphabetically. Starting new game in 5 seconds...")
    time.sleep(5)  # 5 second delay before starting new game
    _new_game()

def _render_hit_miss(state: GameState):
    # Determine last reveal outcome from last_action string
    action = (state.last_action or "").strip()
    is_hit = action.startswith("Revealed '")
    is_miss = action.startswith("Revealed empty")

    # Render as a circular radio group, side-by-side
    st.markdown(
        f"""
        <div class=\"bw-radio-group\" role=\"radiogroup\" aria-label=\"Hit or Miss\">\n          <div class=\"bw-radio-item\">\n            <div class=\"bw-radio-circle {'active hit' if is_hit else ''}\" role=\"radio\" aria-checked=\"{'true' if is_hit else 'false'}\" aria-label=\"Hit\">\n              <span class=\"dot\"></span>\n            </div>\n            <div class=\"bw-radio-caption\">HIT</div>\n          </div>\n          <div class=\"bw-radio-item\">\n            <div class=\"bw-radio-circle {'active miss' if is_miss else ''}\" role=\"radio\" aria-checked=\"{'true' if is_miss else 'false'}\" aria-label=\"Miss\">\n              <span class=\"dot\"></span>\n            </div>\n            <div class=\"bw-radio-caption\">MISS</div>\n          </div>\n        </div>
        """,
        unsafe_allow_html=True,
    )


def _render_correct_try_again(state: GameState):
    # Determine last guess outcome from last_action string
    action = (state.last_action or "").strip()
    is_correct = action.startswith("Correct!")
    is_try_again = action.startswith("Try Again!")

    st.markdown(
        """
        <style>
        .bw-radio-caption.inactive { display: none !important; }
        </style>
        """,
        unsafe_allow_html=True,
    )

    st.markdown(
        f"""
        <div class=\"bw-radio-group\" role=\"radiogroup\" aria-label=\"Correct or Try Again\">\n          <div class=\"bw-radio-item\">\n            <div class=\"bw-radio-circle {'active hit' if is_correct else ''}\" role=\"radio\" aria-checked=\"{'true' if is_correct else 'false'}\" aria-label=\"Correct\">\n              <span class=\"dot\"></span>\n            </div>\n            <div class=\"bw-radio-caption{' inactive' if not is_correct else ''}\">CORRECT!</div>\n          </div>\n          <div class=\"bw-radio-item\">\n            <div class=\"bw-radio-circle {'active miss' if is_try_again else ''}\" role=\"radio\" aria-checked=\"{'true' if is_try_again else 'false'}\" aria-label=\"Try Again\">\n              <span class=\"dot\"></span>\n            </div>\n            <div class=\"bw-radio-caption{' inactive' if not is_try_again else ''}\">TRY AGAIN</div>\n          </div>\n        </div>
        """,
        unsafe_allow_html=True,
    )


def _render_guess_form(state: GameState):    
    # Initialize incorrect guesses list in session state (safety check)
    if "incorrect_guesses" not in st.session_state:
        st.session_state.incorrect_guesses = []

    # Prepare tooltip text for native browser tooltip (stack vertically)
    recent_incorrect = st.session_state.incorrect_guesses[-10:]
    if st.session_state.get("show_incorrect_guesses", True) and recent_incorrect:
        if recent_incorrect:
            # Build a bullet list so items stack vertically inside the tooltip
            bullets = "\n".join(f"• {g}" for g in recent_incorrect)
            tooltip_text = "Recent incorrect guesses:\n" + bullets
        else:
            tooltip_text = "No incorrect guesses yet"
    else:
        tooltip_text = None
    
    # Add CSS for the incorrect guesses display
    st.markdown(
        """
        <style>
        .bw-incorrect-guesses {
            font-size: 0.7rem;
            color: #ff9999;
            margin-top: -10px;
            font-style: italic;
        }
        /* Reposition tooltip anchor under the input */
        .st-key-guess_input .stTooltipIcon {
            position: absolute;
            left: 0;
            bottom: -26px; /* slight nudge down so the tooltip appears below input */
            width: auto !important;
        }
        /* Ensure tooltip content wraps and preserves newlines for vertical stacking */
        div[data-testid="stTooltipContent"], div[role="tooltip"] {
            white-space: pre-wrap !important;
            text-align: left !important;
            max-width: 320px !important;
            line-height: 1.2;
            margin-bottom: 35px;            
        }
        /* Nudge tooltip popover below the trigger when possible */
        div[data-testid="stTooltipPopover"] {
            margin-top: 8px !important;
        }

        /* Hide the default SVG info icon */
        .st-key-guess_input .stTooltipIcon svg.icon {
            display: none !important;
        }
        /* Make the tooltip trigger look like a link reading "incorrect guesses" */
        .st-key-guess_input .stTooltipIcon .stTooltipHoverTarget {
            display: inline-flex;
            align-items: center;
            width: auto;
            min-width: 100px;
        }
        .st-key-guess_input .stTooltipIcon .stTooltipHoverTarget::after {
            content: "incorrect guesses";
            color: #FFFFFF;
            text-decoration: underline;
            font-size: 0.8rem;
            cursor: help;
        }
        .st-key-guess_input .stTooltipIcon .stTooltipHoverTarget:hover::after {
            color: #ff9999;
        }

        .stForm { padding-bottom: 30px; }

        @media (max-width: 640px) {
            .st-emotion-cache-1xwdq91, .st-emotion-cache-1r70o5b {
                max-width: max-content; min-width:33%;
            }
        }
        </style>
        """,
        unsafe_allow_html=True,
    )
    
    with st.form("guess_form", width=300, clear_on_submit=True):
        col1, col2 = st.columns([2, 1], vertical_alignment="bottom")
        with col1:
            guess_text = st.text_input(
                "Your Guess", 
                value="", 
                max_chars=10, 
                width=200, 
                key="guess_input",
                help=tooltip_text,  # Use Streamlit's built-in help parameter for tooltip                
            )
        with col2:
            submitted = st.form_submit_button("OK", disabled=not state.can_guess, width=100, key="guess_submit")
        
        # Show compact list below input if setting is enabled
        #if st.session_state.get("show_incorrect_guesses", True) and recent_incorrect:
        #    st.markdown(
        #        f'<div class="bw-incorrect-guesses">Recent: {", ".join(recent_incorrect)}</div>',
        #        unsafe_allow_html=True,
        #    )
        
        if submitted:
            correct, _ = guess_word(state, guess_text)
            _sync_back(state)
            # Invalidate radar GIF cache if guess changed the set of guessed words
            if correct:
                st.session_state.radar_gif_path = None
                st.session_state.radar_gif_signature = None
                play_sound_effect("correct_guess", volume=(st.session_state.get("effects_volume", 50) / 100))
            else:
                # Update incorrect guesses list - keep only last 10
                st.session_state.incorrect_guesses.append(guess_text)
                st.session_state.incorrect_guesses = st.session_state.incorrect_guesses[-10:]
                play_sound_effect("incorrect_guess", volume=(st.session_state.get("effects_volume", 50) / 100))
            st.rerun()


# -------------------- Score Panel --------------------
def _render_score_panel(state: GameState):
    # Always render the score table (overlay handled separately)
    rows_html = []
    header_html = (
        "<tr>"
        "<th class=\"blue-background bold-text\">Word</th>"
        "<th class=\"blue-background bold-text\">Letters</th>"
        "<th class=\"blue-background bold-text\">Extra</th>"
        "</tr>"
    )
    rows_html.append(header_html)

    for w in state.puzzle.words:
        pts = state.points_by_word.get(w.text, 0)
        letters_display = len(w.text)
        if pts > 0 or state.game_mode == "too easy":            
            # Extra = total points for the word minus its length (bonus earned)
            extra_pts = max(0, pts - letters_display)
            row_html = (
                "<tr>"
                f"<td class=\"blue-background \">{w.text}</td>"
                f"<td class=\"blue-background \">{letters_display}</td>"
                f"<td class=\"blue-background \">{extra_pts}</td>"
                "</tr>"
            )
            rows_html.append(row_html)
        else:
            # Hide unguessed words in classic mode
            row_html = (
                "<tr>"
                f"<td class=\"blue-background \">{hidden_word_display(letters_display,'_')}</td>"
                f"<td class=\"blue-background \">{letters_display}</td>"
                f"<td class=\"blue-background \">_</td>"
                "</tr>"
            )
            rows_html.append(row_html)

    # Initial time shown from server; JS will tick client-side
    now = datetime.now()
    start = state.start_time or now
    end = state.end_time or (now if is_game_over(state) else None)
    elapsed = (end or now) - start
    mins, secs = divmod(int(elapsed.total_seconds()), 60)
    timer_str = f"{mins:02d}:{secs:02d}"

    span_id = f"bw-timer-{getattr(state.puzzle, 'uid', 'default')}"
    timer_span_html = f"<span id=\"{span_id}\" style='font-size:1rem; color:#ffffff;'>&nbsp;⏱ {timer_str}</span>"

    total_row_html = (
        f"<tr class=\"blue-background\"><td colspan='3'>"
        f"<h3 class=\"bold-text\">Total: {state.score} {timer_span_html}</h3>"
        f"</td></tr>"
    )
    rows_html.append(total_row_html)

    # Build a self-contained HTML document so JS runs inside the component iframe
    start_ms = int(start.timestamp() * 1000)
    end_ms = int(end.timestamp() * 1000) if end else None

    table_inner = "".join(rows_html)
    html_doc = f"""
    <div class='bw-score-panel-container'>
      <style>
        .bold-text {{ font-weight: 700; }}
        .blue-background {{ background:#1d64c8; opacity:0.9; color:#fff; }}
        .shiny-border {{ position: relative; padding: 12px; background: #333; color: white; border-radius: 1.25rem; overflow: hidden; }}
        .bw-score-panel-container {{ height: 100%; overflow: hidden; text-align:center;}}
        .bw-score-panel-container table tbody tr h3 {{display: flex;flex-direction: row;justify-content: space-evenly;flex-wrap: wrap;}}
        table {{ width: 100%; margin: 0 auto; border-collapse: separate; border-spacing: 0; }}
        th, td {{ padding: 6px 8px; }}
      </style>
      <table class='shiny-border' style="background: linear-gradient(-45deg, #a1a1a1, #ffffff, #a1a1a1, #666666);">
        {table_inner}
      </table>
      <script>
        (function() {{
          try {{
            var span = document.getElementById("{span_id}");
            if (!span) return;
            var startMs = {start_ms};
            var endMs = {"null" if end_ms is None else end_ms};

            function fmt(ms) {{
              var total = Math.max(0, Math.floor(ms / 1000));
              var m = Math.floor(total / 60);
              var s = total % 60;
              return (m < 10 ? "0" : "") + m + ":" + (s < 10 ? "0" : "") + s;
            }}

            function render(ms) {{
              if (endMs !== null) {{
                span.textContent = "⏱ " + fmt(endMs - startMs);
                return;
              }}
              var now = Date.now();
              span.textContent = "⏱ " + fmt(Math.max(0, now - startMs));
            }}

            function tick() {{
              if (endMs !== null) {{
                render(endMs - startMs);
                return;
              }}
              var now = Date.now();
              render(Math.max(0, now - startMs));
            }}

            tick();
            if (endMs === null) {{
              setInterval(tick, 1000);
            }}
          }} catch (e) {{
            // no-op
          }}
        }})();
      </script>
    </div>
    """

    # Height heuristic to avoid layout jumps
    num_rows = len(rows_html)
    height = 40 + (num_rows * 36)
    components.html(html_doc, height=height, scrolling=False)

# -------------------- Game Over Dialog --------------------

def _game_over_content(state: GameState) -> None:
    # Play congratulations music (not sound effect) as background if enabled
    music_dir = _get_music_dir()
    congrats_music_path = os.path.join(music_dir, "congratulations.mp3")
    if st.session_state.get("music_enabled", False) and os.path.exists(congrats_music_path):
        src_url = _load_audio_data_url(congrats_music_path)
        # Play once (no loop) at configured volume
        _mount_background_audio(enabled=True, src_data_url=src_url, volume=(st.session_state.get("music_volume", 100)) / 100, loop=False)
    else:
        _mount_background_audio(False, None, 0.0)

    # Set end_time if not already set
    if state.end_time is None:
        st.session_state.end_time = datetime.now()
        state.end_time = st.session_state.end_time

    # Timer calculation
    start = state.start_time or state.end_time or datetime.now()
    end = state.end_time or datetime.now()
    elapsed = end - start
    elapsed_seconds = int(elapsed.total_seconds())
    mins, secs = divmod(elapsed_seconds, 60)
    timer_str = f"{mins:02d}:{secs:02d}"

    # Compute optional word list difficulty for current run
    difficulty_value = None
    try:
        wordlist_source = st.session_state.get("selected_wordlist")
        if wordlist_source:
            words_dir = os.path.join(os.path.dirname(__file__), "words")
            wordlist_path = os.path.join(words_dir, wordlist_source)
            if os.path.exists(wordlist_path):
                current_words = [w.text for w in state.puzzle.words]
                total_diff, _ = compute_word_difficulties(wordlist_path, words_array=current_words)
                difficulty_value = float(total_diff)
    except Exception:
        difficulty_value = None

    # Render difficulty line only if we have a value
    difficulty_html = (
        f'<tr><td colspan=\"3\"><h5 class=\"m-2\">Word list difficulty: {difficulty_value:.2f}</h5></td></tr>'
        if difficulty_value is not None else ""
    )

    # Build table body HTML for dialog content
    word_rows = []
    for w in state.puzzle.words:
        pts = st.session_state.points_by_word.get(w.text, 0)
        extra_pts = max(0, pts - len(w.text))
        word_rows.append(
            f"<tr><td class=\"blue-background\">{w.text}</td><td class=\"blue-background\">{len(w.text)}</td><td class=\"blue-background\">{extra_pts}</td></tr>"
        )

    table_html = (
        "<table class=\"shiny-border\" style=\"border-radius:0.75rem; overflow:hidden; width:100%; margin:0 auto; border-collapse:separate; border-spacing: 0;\">"
        "<thead><tr>"
        "<th scope=\"col\">Word</th>"
        "<th scope=\"col\">Letters</th>"
        "<th scope=\"col\">Extra</th>"
        "</tr></thead>"
        f"<tbody>{''.join(word_rows)}"
        f"<tr><td colspan=\"3\"><h5 class=\"m-2\">Total: {state.score} <span style='font-size:1.25rem; color:#1d64c8;'>&nbsp;⏱ {timer_str}</span></h5></td></tr>"
        f"{difficulty_html}"
        "</tbody>"
        "</table>"
    )

    # Optional extra styles for this dialog content
    st.markdown(
        """
        <style>
          .bw-dialog-container {
            border-radius: 1rem;
            box-shadow: 0 0 32px #1d64c8;
            background: linear-gradient(-45deg, #1d64c8, #ffffff, #1d64c8, #666666);
            color: #fff;
            padding: 16px;
          }
          .bw-dialog-header { display:flex; justify-content: space-between; align-items:center; }
          .bw-dialog-title, .st-emotion-cache-11elpad p { margin: 0; font-weight: bold;font-size: 1.5rem;text-align: center;flex: auto;filter:drop-shadow(1px 1px 2px #003);} 
          .text-success { color: #20d46c;font-weight: bold;font-size: 1.5rem;text-align: center;flex: auto;filter:drop-shadow(1px 1px 2px #003); }
          .st-key-new_game_btn_dialog, .st-key-close_game_over { width: 50% !important;
              height: auto;
              min-width: unset !important;
              margin: 25px auto 0;
           }
           .m-2 {display: flex;flex-direction: row;justify-content: space-evenly;flex-wrap: wrap;font-size: 1.25rem; font-weight: bold;}
           .st-key-new_game_btn_dialog button, .st-key-close_game_over button {
            height: 50px !important;
           }
           .st-key-new_game_btn_dialog:hover, .st-key-close_game_over:hover{
              /*background: linear-gradient(-45deg, #1d64c8, #ffffff, #1d64c8, #666666);*/
              background: #1d64c8 !important;
              /*filter:drop-shadow(1px 1px 2px #003);*/
              /*filter: invert(1);*/
           }
           .st-bb {background-color: rgba(29, 100, 200, 0.5);} 
           .st-key-generate_share_link div[data-testid="stButton"] button { aspect-ratio: auto;} 
           .st-key-generate_share_link div[data-testid="stButton"] button:hover { color: #1d64c8;}
        </style>
        """,
        unsafe_allow_html=True,
    )

    st.markdown(
        f"""
        <div class="bw-dialog-container shiny-border">
          <div class="p-3 pt-2">
            <div class="mb-2">Congratulations!</div>
            <div class="mb-2">Final score: <strong class="text-success">{state.score}</strong></div>
            <div class="mb-2">Time: <strong>{timer_str}</strong></div>            
            <div class="mb-2">Tier: <strong>{compute_tier(state.score)}</strong></div>
            <div class="mb-2">Game Mode: <strong>{state.game_mode}</strong></div>
            <div class="mb-2">Wordlist: <strong>{st.session_state.get('selected_wordlist', '')}</strong></div>
            <div class="mb-0">{table_html}</div>            
          </div>
        </div>
        """,
        unsafe_allow_html=True,
    )

    # Ensure the popup is in view by scrolling the parent window to the main anchor (or top as fallback)
    components.html(
        """
        <script>
        (function() {
          try {
            var parentDoc = window.parent && window.parent.document ? window.parent.document : document;
            var anchor = parentDoc.getElementById('bw-main-anchor');
            if (anchor && anchor.scrollIntoView) {
              anchor.scrollIntoView({ behavior: 'smooth', block: 'start' });
            } else if (window.parent && window.parent.scrollTo) {
              window.parent.scrollTo({ top: 0, behavior: 'smooth' });
            } else {
              window.scrollTo({ top: 0, behavior: 'smooth' });
            }
          } catch (e) { /* no-op */ }
        })();
        </script>
        """,
        height=0,
    )

    # Share Challenge Button
    st.markdown("---")

    # Style the containing Streamlit block via CSS :has() using an anchor inside this container
    with st.container():
        st.markdown(
            """
            <style>
              /* Apply the dialog background to the Streamlit block that contains our anchor */
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) {
                border-radius: 1rem;
                box-shadow: 0 0 32px #1d64c8;
                background: linear-gradient(-45deg, #1d64c8, #ffffff, #1d64c8, #666666);
                color: #fff;
                padding: 16px;
              }
              /* Improve inner text contrast inside the styled block */
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) h3,
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) label,
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) p {
                color: #fff !important;
              }
              /* Ensure code block is readable */
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) pre,
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) code {
                background: rgba(0,0,0,0.25) !important;
                color: #fff !important;
              }
              /* Buttons hover contrast */
              div[data-testid="stVerticalBlock"]:has(#bw-share-anchor) button:hover {
                filter: brightness(1.1);
              }
            </style>
            <div id="bw-share-anchor"></div>
            """,
            unsafe_allow_html=True,
        )

        st.markdown("### 🎮 Share Your Challenge")

        # Check if this is a shared game being completed
        is_shared_game = st.session_state.get("loaded_game_sid") is not None
        existing_sid = st.session_state.get("loaded_game_sid")

        # Username input
        if "player_username" not in st.session_state:
            st.session_state["player_username"] = ""

        username = st.text_input(
            "Enter your name (optional)",
            value=st.session_state.get("player_username", ""),
            key="username_input",
            placeholder="Anonymous"
        )
        if username:
            st.session_state["player_username"] = username
        else:
            username = "Anonymous"

        # Check if share URL already generated
        if "share_url" not in st.session_state or st.session_state.get("share_url") is None:
            button_text = "📊 Submit Your Result" if is_shared_game else "🔗 Generate Share Link"

            if st.button(button_text, key="generate_share_link", use_container_width=True):
                try:
                    # Extract game data
                    word_list = [w.text for w in state.puzzle.words]
                    spacer = state.puzzle.spacer
                    may_overlap = state.puzzle.may_overlap
                    wordlist_source = st.session_state.get("selected_wordlist", "unknown")

                    if is_shared_game and existing_sid:
                        # Add result to existing game
                        success = add_user_result_to_game(
                            sid=existing_sid,
                            username=username,
                            word_list=word_list,  # Each user gets different words
                            score=state.score,
                            time_seconds=elapsed_seconds
                        )

                        if success:
                            share_url = get_shareable_url(existing_sid)
                            st.session_state["share_url"] = share_url
                            st.session_state["share_sid"] = existing_sid
                            st.success(f"✅ Result submitted for {username}!")
                            st.rerun()
                        else:
                            st.error("Failed to submit result")
                    else:
                        # Create new game
                        challenge_id, full_url, sid = save_game_to_hf(
                            word_list=word_list,
                            username=username,
                            score=state.score,
                            time_seconds=elapsed_seconds,
                            game_mode=state.game_mode,
                            grid_size=state.grid_size,
                            spacer=spacer,
                            may_overlap=may_overlap,
                            wordlist_source=wordlist_source
                        )

                        if sid:
                            share_url = get_shareable_url(sid)
                            st.session_state["share_url"] = share_url
                            st.session_state["share_sid"] = sid
                            st.rerun()
                        else:
                            st.error("Failed to generate short URL")

                except Exception as e:
                    st.error(f"Failed to save game: {e}")
        else:
            # Conditionally display the generated share URL
            if st.session_state.get("show_challenge_share_links", False):
                # Display generated share URL
                share_url = st.session_state["share_url"]
                st.success("✅ Share link generated!")
                st.code(share_url, language=None)

                # More robust copy-to-clipboard implementation with fallbacks
                import json as _json
                import html as _html

                _share_url_json = _json.dumps(share_url)  # safe for JS
                _share_url_attr = _html.escape(share_url, quote=True)  # safe for HTML attribute
                _share_url_text = _html.escape(share_url)

                components.html(
                    f"""
                    <div id="bw-copy-container" style="
                        display:flex;
                        gap:8px;
                        width:100%;
                        align-items:center;
                        margin-top:6px;
                        justify-content:center;
                    ">
                    
                    <strong><a href="{_share_url_attr}"
                        target="_blank" 
                        rel="noopener noreferrer"
                        style="text-decoration: underline; color: #fff; word-break: break-all; filter: drop-shadow(1px 1px 2px #003);">
                    {_share_url_text}
                    </a></strong>
                    </div>
                    """,
                    height=80
                )
            else:
                # Do not display the share URL, but confirm it’s saved/submitted
                st.success("✅ Your result has been saved.")

    st.markdown("---")

    # Dialog actions
    if st.button("Close", key="close_game_over"):
        st.session_state["show_gameover_overlay"] = False
        st.session_state["remount_background_audio"] = True  # <-- set flag
        st.rerun()

# Prefer st.dialog/experimental_dialog; fallback to st.modal if unavailable
_Dialog = getattr(st, "dialog", getattr(st, "experimental_dialog", None))
if _Dialog:
    @_Dialog("Game Over")
    def _game_over_dialog(state: GameState):
        _game_over_content(state)
else:
    def _game_over_dialog(state: GameState):
        modal_ctx = getattr(st, "modal", None)
        if callable(modal_ctx):
            with modal_ctx("Game Over"):
                _game_over_content(state)
        else:
            # Last-resort inline render
            st.subheader("Game Over")
            _game_over_content(state)

def _render_game_over(state: GameState):
    visible = bool(st.session_state.get("show_gameover_overlay", True)) and is_game_over(state)
    music_dir = _get_music_dir()
    if visible:
        # Mount congratulations music (play once, do not loop) only if music is enabled
        congrats_music_path = os.path.join(music_dir, "congratulations.mp3")
        if st.session_state.get("music_enabled", False) and os.path.exists(congrats_music_path):
            src_url = _load_audio_data_url(congrats_music_path)
            _mount_background_audio(enabled=True, src_data_url=src_url, volume=(st.session_state.get("music_volume", 100)) / 100, loop=False)
        else:
            _mount_background_audio(False, None, 0.0)
        _game_over_dialog(state)
    else:
        # Only play background music if music is enabled
        if st.session_state.get("music_enabled", False):
            # Prefer user-selected track
            track_path = st.session_state.get("music_track_path")
            if track_path and os.path.exists(track_path):
                src_url = _load_audio_data_url(track_path)
                _mount_background_audio(True, src_url, (st.session_state.get("music_volume", 100)) / 100)
            else:
                # Fallback to a default background track if available
                background_path = os.path.join(music_dir, "background.mp3")
                if os.path.exists(background_path):
                    src_url = _load_audio_data_url(background_path)
                    _mount_background_audio(True, src_url, (st.session_state.get("music_volume", 100)) / 100)
                else:
                    _mount_background_audio(False, None, 0.0)

def run_app():
    # Render PWA service worker registration (meta tags in <head> via Docker)
    st.markdown(pwa_service_worker, unsafe_allow_html=True)

    # Handle query params using new API
    try:
        params = st.query_params
    except Exception:
        params = {}

    # Handle overlay dismissal
    if params.get("overlay") == "0":
        # Clear param and remember to hide overlay this session
        try:
            st.query_params.clear()
        except Exception:
            pass
        st.session_state["hide_gameover_overlay"] = True

    # Handle game_id for loading shared games
    if "game_id" in params and "shared_game_loaded" not in st.session_state:
        sid = params.get("game_id")
        try:
            settings = load_game_from_sid(sid)
            if settings:
                # Store loaded settings and sid for initialization
                st.session_state["shared_game_settings"] = settings
                st.session_state["loaded_game_sid"] = sid  # Store sid for adding results later
                st.session_state["shared_game_loaded"] = True

                # Get best score and time from users array
                users = settings.get("users", [])
                if users:
                    best_score = max(u["score"] for u in users)
                    best_time = min(u["time"] for u in users)
                    st.toast(
                        f"🎯 Loading shared challenge (Best: {best_score} pts in {best_time}s by {len(users)} player(s))",
                        icon="ℹ️"
                    )
                else:
                    st.toast("🎯 Loading shared challenge", icon="ℹ️")
            else:
                st.warning(f"No shared game found for ID: {sid}. Starting a normal game.")
                st.session_state["shared_game_loaded"] = True  # Prevent repeated attempts
        except Exception as e:
            st.error(f"❌ Error loading shared game: {e}")
            st.session_state["shared_game_loaded"] = True  # Prevent repeated attempts

    _init_session()
    st.markdown(ocean_background_css, unsafe_allow_html=True)
    inject_ocean_layers()  # <-- add the animated layers
    _render_header()
    _render_sidebar()

    state = _to_state()

    # Anchor to target the main two-column layout for mobile reversal
    st.markdown('<div id="bw-main-anchor"></div>', unsafe_allow_html=True)
    left, right = st.columns([3, 2], gap="medium")
    with right:
        _render_radar(state.puzzle, size=state.grid_size, r_max=0.8, max_frames=25, sinusoid_expand=True, stagger_radar=False, show_ticks=st.session_state.get("show_grid_ticks", False))
        one, two = st.columns([1, 2], gap="medium")
        with one:
            _render_correct_try_again(state)
            #_render_hit_miss(state)
        with two:              
            _render_guess_form(state)
        #st.divider()        
        _render_score_panel(state)
    with left:
        _render_grid(state, st.session_state.letter_map, show_grid_ticks=st.session_state.get("show_grid_ticks", True))
        st.button("New Game", width=125, on_click=_new_game, key="new_game_btn")

    # End condition (only show overlay if dismissed)
    state = _to_state()
    if is_game_over(state) and not st.session_state.get("hide_gameover_overlay", False):
        _render_game_over(state)

def _on_game_option_change() -> None:
    """
    Unified callback for game option changes.
    If currently in a loaded challenge, break the link by resetting challenge state
    and removing the game_id query param. Then start a new game with the updated options.
    """
    try:
        # Remove challenge-specific query param if present
        if hasattr(st, "query_params"):
            qp = st.query_params
            # st.query_params may be a Mapping; pop safely if supported
            try:
                if "game_id" in qp:
                    qp.pop("game_id")
            except Exception:
                # Fallback: clear all params if pop not supported
                try:
                    st.query_params.clear()
                except Exception:
                    pass
    except Exception:
        pass

    # Clear challenge session flags and links
    if st.session_state.get("loaded_game_sid") is not None:
        st.session_state.loaded_game_sid = None
    # Remove loaded challenge settings so UI no longer treats session as challenge mode
    st.session_state.pop("shared_game_settings", None)
    # Ensure the loader won't auto-reload challenge on rerun within this session
    st.session_state["shared_game_loaded"] = True

    # Clear any existing generated share link tied to the previous challenge
    st.session_state.pop("share_url", None)
    st.session_state.pop("share_sid", None)

    # Start a fresh game with updated options
    _new_game()