// 24/7 assistant widget: floating bubble, slide-up panel, /api/chat.
(function () {
  const root = document.createElement('div');
  root.id = 'iapChat';
  root.innerHTML = '<button id="iapChatBtn" aria-label="Chat with us" type="button">💬</button>'
    + '<div id="iapChatPanel" hidden>'
    + '<div class="ch-head"><b>Ask anything</b><span class="ch-sub">Real answers, around the clock</span>'
    + '<button id="iapChatClose" aria-label="Close chat" type="button">×</button></div>'
    + '<div class="ch-msgs" id="iapChatMsgs">'
    + '<div class="ch-m bot">Hey. Ask me how the payments work, what the packages buy, or anything else. Straight answers only, no income hype.</div>'
    + '</div>'
    + '<div class="ch-input"><input id="iapChatIn" placeholder="Type your question…" maxlength="600">'
    + '<button id="iapChatSend" type="button">Send</button></div>'
    + '</div>';
  document.body.appendChild(root);

  const $ = id => document.getElementById(id);
  const msgs = $('iapChatMsgs');
  const input = $('iapChatIn');
  let history = [];

  const add = (text, who) => {
    const d = document.createElement('div');
    d.className = 'ch-m ' + who;
    // linkify plain URLs
    d.innerHTML = String(text).replace(/[&<>]/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;' }[c]))
      .replace(/(https?:\/\/[^\s]+)/g, '<a href="$1" target="_blank" rel="noopener">$1</a>');
    msgs.appendChild(d);
    msgs.scrollTop = msgs.scrollHeight;
    return d;
  };
  async function send() {
    const q = input.value.trim();
    if (!q) return;
    input.value = '';
    add(q, 'me');
    const wait = add('…', 'bot');
    try {
      const r = await (await fetch('/api/chat', { method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: q, history: history.slice(-4).join(' | ') }) })).json();
      wait.remove();
      add(r.reply || r.error || 'No answer came back. Try again.', 'bot');
      history.push('Q: ' + q, 'A: ' + (r.reply || ''));
    } catch (e) {
      wait.remove();
      add('Connection hiccup. Try that again.', 'bot');
    }
  }
  $('iapChatBtn').addEventListener('click', () => {
    const p = $('iapChatPanel');
    p.hidden = !p.hidden;
    if (!p.hidden) input.focus();
  });
  $('iapChatClose').addEventListener('click', () => { $('iapChatPanel').hidden = true; });
  $('iapChatSend').addEventListener('click', send);
  input.addEventListener('keydown', e => { if (e.key === 'Enter') send(); });
})();