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Editing: init.php

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<?php
/*****************************************************************
 *  OpenAI helper  (v1.8) · BestDealOn · Aug 2025
 *  -------------------------------------------------------------
 *  • AES‑encrypted API‑key cookie
 *  • Re‑usable dark key‑bar  (save / delete / model / usage link)
 *  • ⚙ modal for per‑user defaults (temperature & max‑tokens)
 *  • Reads the list of *allowed* models from /cache/models.json
 *    ─── only entries with  "active": true  appear in the drop‑down
 *****************************************************************/
declare(strict_types=1);

/* ---------- 0. CONFIG -------------------------------------------------- */
const AI_COOKIE = 'openai_key';
const AI_SECRET = 'openai-shared-v1';              // keep identical everywhere
const AI_TTL    = 30 * 24 * 3600;                  // 30 days
const AI_MODEL_FILE = __DIR__ . '/../cache/models.json'; // editable list

$AI_ROOT = (static function (): string {
    $h = $_SERVER['HTTP_HOST'] ?? '';
    return (!filter_var($h, FILTER_VALIDATE_IP) &&
            preg_match('/([a-z0-9-]+\.[a-z]{2,})$/i', $h, $m))
           ? '.' . $m[1] : '';
})();

/* ---------- 1. CRYPTO --------------------------------------------------- */
function ai_enc(string $p): string {
    $algo = 'aes-128-ctr';
    $key  = substr(hash('sha256', AI_SECRET, true), 0, 16);
    $iv   = random_bytes(openssl_cipher_iv_length($algo));
    return base64_encode(openssl_encrypt($p, $algo, $key, 0, $iv) . "::{$iv}");
}
function ai_dec(string $c): string {
    [$ct, $iv] = explode('::', base64_decode($c), 2) + ['', ''];
    $algo = 'aes-128-ctr';
    $key  = substr(hash('sha256', AI_SECRET, true), 0, 16);
    return openssl_decrypt($ct, $algo, $key, 0, $iv) ?: '';
}

/* ---------- 2. COOKIE HELPERS ------------------------------------------ */
function ai_has_key(): bool   { return isset($_COOKIE[AI_COOKIE]) && ai_dec($_COOKIE[AI_COOKIE]); }
function ai_get_key(): string { return ai_has_key() ? ai_dec($_COOKIE[AI_COOKIE]) : ''; }

$AI_MSG = '';   // flash banner

/* ---------- 2½. AVAILABLE MODELS (from JSON) ---------------------------- */
function ai_available_models(): array
{
    static $cache = null;                   // keep in memory per request
    if ($cache !== null) return $cache;

if (!is_file(AI_MODEL_FILE)) {
        return $cache = ['gpt-3.5-turbo', 'gpt-4o-mini', 'gpt-4'];
    }
    $raw = json_decode(file_get_contents(AI_MODEL_FILE), true);
    if (!is_array($raw)) {
        return $cache = ['gpt-3.5-turbo', 'gpt-4o-mini', 'gpt-4'];
    }
    $out = [];
    foreach ($raw as $row) {
        if (is_array($row) && ($row['active'] ?? false) && !empty($row['id'])) {
            $out[] = $row['id'];
        }
    }
    return $cache = $out ?: ['gpt-3.5-turbo', 'gpt-4o-mini', 'gpt-4'];
}

/* ---------- 3. SAVE / DELETE KEY --------------------------------------- */
function ai_handle_key_post(): void {
    global $AI_ROOT, $AI_MSG;

/* save */
    if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['save_key'])) {
        setcookie(AI_COOKIE, '', time() - 3600, '/', $AI_ROOT, isset($_SERVER['HTTPS']), true);
        $raw = trim($_POST['api_key'] ?? '');
        if ($raw === '') { $AI_MSG = 'API key empty'; return; }

$ctx = stream_context_create(['http'=>[
            'method'=>'GET', 'header'=>"Authorization: Bearer $raw\r\n", 'timeout'=>6
        ]]);
        if (@file_get_contents('https://api.openai.com/v1/models', false, $ctx)) {
            setcookie(AI_COOKIE, ai_enc($raw), time() + AI_TTL,
                      '/', $AI_ROOT, isset($_SERVER['HTTPS']), true);
            header('Location: ' . $_SERVER['REQUEST_URI']);
            exit;
        }
        $AI_MSG = '❌ Invalid API key (or network error).';
        return;
    }

/* delete */
    if (isset($_GET['logout'])) {
        setcookie(AI_COOKIE, '', time() - 3600, '/', $AI_ROOT, isset($_SERVER['HTTPS']), true);
        header('Location: ' . $_SERVER['PHP_SELF']);
        exit;
    }
}

/* ---------- 4. KEY BAR + JS  ------------------------------------------ */
function ai_render_key_bar(): void {
    global $AI_MSG;
    $models = ai_available_models();           // <‑‑ from JSON
?>

<style>
.top-bar{background:#0d1117;padding:.25rem 1rem;display:flex;flex-wrap:wrap;align-items:center;
         justify-content:space-between;gap:.75rem;font-size:.9rem}
.top-bar .left,.top-bar .right{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.top-bar h1{margin:0;font-size:1rem;color:#ffb63b;display:flex;align-items:center;gap:.4rem}
.logout-btn{background:none;color:#e24d4b;font-size:1.1rem;font-weight:700;border:none;cursor:pointer}
.gear-btn {
  /* keep the flex centering you already have */
  display: flex;
  align-items: center;
  justify-content: center;

/* then bump it up 2px (or whatever looks right) */
  margin-top: -2px;

width: 36px;
  height: 36px;        /* ← match your inputs/selects */
  font-size: 1.05rem;

background: #1e2430;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.top-bar input[type=password],.top-bar select,.top-bar button[name=save_key]{
  height:34px;font-size:.9rem;border:none;border-radius:4px;padding:0 .8rem;line-height:1}
.top-bar input[type=password]{width:180px;background:#fff}
/* Inputs & dropdown all use flex centering */
.top-bar input[type="password"],
.top-bar select,
.top-bar button[name="save_key"] {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  font-size: 0.9rem;
  border: none;
  border-radius: 4px;
  padding: 0 0.8rem;
  box-sizing: border-box;
  line-height: 1;
  margin: 0;
}

.top-bar a{font-size:.85rem;color:#5af287;text-decoration:none;white-space:nowrap}
.top-bar select{background:#1e2430;color:#fff}
.top-bar select,
.top-bar input[type="password"],
.top-bar button[name="save_key"]{
    width:auto;
    padding:0 .8rem;
}
</style>

<div class="top-bar">
<?php if (!ai_has_key()): ?>
  <div class="left">
    <h1>Connect to OpenAI</h1>
    <a href="https://platform.openai.com/account/api-keys" target="_blank">Get an API key ↗</a>
  </div>
  <form method="post" autocomplete="off" class="right">
    <input type="password" name="api_key" placeholder="sk-…" required>
    <button name="save_key">Save Key</button>
  </form>
  <?php if($AI_MSG): ?><div style="width:100%;color:#e24d4b;font-weight:600;margin-top:.25rem"><?=$AI_MSG?></div><?php endif;?>
<?php else: ?>
  <div class="left">
    <h1>Connected to OpenAI <button class="logout-btn" onclick="location='?logout=1'" title="Delete key">×</button></h1>
  </div>
  <div class="right">
    <button id="aiGear" class="gear-btn" title="Advanced settings">⚙</button>

<select id="modelSel" name="model">
      <?php foreach($models as $m) echo "<option>$m</option>"; ?>
    </select>

<a href="https://platform.openai.com/account/usage" target="_blank">Check usage ↗</a>
    <?php if($AI_MSG): ?><span style="color:#e24d4b;font-weight:600"><?=$AI_MSG?></span><?php endif;?>
  </div>
<?php endif; ?>
</div>

<div id="aiModal" style="display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:9999">
  <div style="background:#fff;padding:1.6rem;border-radius:8px;max-width:320px;width:90%;margin:8% auto;
              font-size:.95rem;box-shadow:0 4px 18px rgba(0,0,0,.2)">
    <h3 style="margin-top:0">Advanced settings</h3>

<label for="aiTemp" style="display:block;margin:.7rem 0 .25rem;font-weight:600">Temperature (0–1)</label>
    <input id="aiTemp" type="number" min="0" max="1" step="0.01" value="0.7"
           style="width:100%;padding:.5rem .7rem;border:1px solid #ccd4e8;border-radius:6px">

<label for="aiTok" style="display:block;margin:.9rem 0 .25rem;font-weight:600">Max tokens (1–4096)</label>
    <input id="aiTok" type="number" min="1" max="4096" value="800"
           style="width:100%;padding:.5rem .7rem;border:1px solid #ccd4e8;border-radius:6px">

<div style="display:flex;gap:.8rem;margin-top:1.4rem;justify-content:flex-end">
      <button id="aiCancel" type="button"
              style="background:#e5e5e5;border:none;border-radius:6px;padding:.5rem 1rem;cursor:pointer">Cancel</button>
      <button id="aiSave" type="button"
              style="background:#004cff;color:#fff;border:none;border-radius:6px;padding:.5rem 1rem;font-weight:600;cursor:pointer">Save</button>
    </div>
  </div>
</div>

/* guard – if stored model vanished, reset to first option */
  if (![...ms.options].some(o=>o.value===ms.value)){
      ms.value = ms.options[0].value;
      localStorage.setItem('aiModel', ms.value);
  }

ms.addEventListener('change', e=>{
      localStorage.setItem('aiModel', e.target.value);
      document.querySelectorAll('input[name=model]').forEach(i=>i.value=e.target.value);
  });
}

/* ===== 2. TEMPERATURE / TOKENS  MODAL ============================ */
const gear=document.getElementById('aiGear'), modal=document.getElementById('aiModal');
if(gear&&modal){
  const tI=document.getElementById('aiTemp'),
        mI=document.getElementById('aiTok'),
        save=document.getElementById('aiSave'),
        cancel=document.getElementById('aiCancel');

try{
    const d=JSON.parse(localStorage.getItem('aiDefaults')||'{}');
    if(d.temp) tI.value=d.temp;
    if(d.max)  mI.value=d.max;
  }catch{}

gear.onclick   = ()=> modal.style.display='block';
  cancel.onclick = ()=> modal.style.display='none';
  modal.addEventListener('click',e=>{ if(e.target===modal) modal.style.display='none'; });

save.onclick = ()=>{
      const obj={ temp:Math.max(0,Math.min(1,parseFloat(tI.value)||0.7)),
                  max :Math.max(1,Math.min(4096,parseInt(mI.value,10)||800)) };
      localStorage.setItem('aiDefaults',JSON.stringify(obj));
      modal.style.display='none';
      dispatchEvent(new CustomEvent('ai-defaults-changed',{detail:obj}));
  };
}

/* ===== 3. INJECT HIDDEN INPUTS INTO FORMS ======================== */
function updateHidden(def={}){
  def.temp = def.temp ?? JSON.parse(localStorage.getItem('aiDefaults')||'{}').temp ?? 0.7;
  def.max  = def.max  ?? JSON.parse(localStorage.getItem('aiDefaults')||'{}').max  ?? 800;

document.querySelectorAll('form').forEach(f=>{
      if (!f.querySelector('textarea[name=prompt],textarea[id*=prompt]')) return;

['model','temperature','max_tokens'].forEach(n=>{
          if(!f.querySelector(`input[name=${n}]`)){
              const inp=document.createElement('input');
              inp.type='hidden'; inp.name=n; f.appendChild(inp);
          }
      });
      f.querySelector('input[name=model]').value =
          localStorage.getItem('aiModel') || (ms?ms.value:'gpt-3.5-turbo');
      f.querySelector('input[name=temperature]').value = def.temp;
      f.querySelector('input[name=max_tokens]').value  = def.max;

f.addEventListener('submit',()=>{
          f.querySelector('input[name=model]').value =
              localStorage.getItem('aiModel') || (ms?ms.value:'gpt-3.5-turbo');
      },{once:true});
  });
}
document.addEventListener('DOMContentLoaded', ()=>updateHidden());
addEventListener('ai-defaults-changed', e=>updateHidden(e.detail));
</script>
<?php
} /* ---------------- end ai_render_key_bar() ---------------- */

/* ---------- 5. ai_chat()  ----------------------------------------- */
function ai_chat(string $prompt, array $override=[]): string
{
    $key = ai_get_key();
    if (!$key) return '➡ (no API key)';

$temp  = $override['temperature']
             ?? floatval($_POST['temperature'] ?? 0.7);
    $max   = $override['max_tokens']
             ?? intval ($_POST['max_tokens']  ?? 800);
    $model = $override['model']
             ?? ($_POST['model'] ?? ($_POST['modelSel'] ?? 'gpt-3.5-turbo'));

$body=[
      'model'       =>$model,
      'messages'    =>[['role'=>'user','content'=>$prompt]],
      'temperature' =>$temp,
      'max_tokens'  =>$max
    ];

$ch=curl_init('https://api.openai.com/v1/chat/completions');
    curl_setopt_array($ch,[CURLOPT_RETURNTRANSFER=>1,CURLOPT_POST=>1,
        CURLOPT_HTTPHEADER=>['Authorization: Bearer '.$key,'Content-Type: application/json'],
        CURLOPT_POSTFIELDS=>json_encode($body),CURLOPT_TIMEOUT=>60]);
    $raw=curl_exec($ch); curl_close($ch);

return $raw
        ? (json_decode($raw,true)['choices'][0]['message']['content'] ?? '')
        : '⚠ no response';
}

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Editing: init.php

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