(function () {
  'use strict';

  const API = 'https://hermes.squaremcp.com/api/chat';
  const BRAND = '#6c47ff';
  const BRAND_DARK = '#5535e0';

  const css = `
    #smcp-btn {
      position: fixed; bottom: 24px; right: 24px; z-index: 9998;
      width: 56px; height: 56px; border-radius: 50%;
      background: ${BRAND}; border: none; cursor: pointer;
      box-shadow: 0 4px 16px rgba(0,0,0,0.18);
      display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    #smcp-btn:hover { background: ${BRAND_DARK}; }
    #smcp-btn svg { width: 26px; height: 26px; }
    #smcp-window {
      position: fixed; bottom: 92px; right: 24px; z-index: 9999;
      width: 360px; height: 520px; border-radius: 16px;
      background: #fff; box-shadow: 0 8px 40px rgba(0,0,0,0.18);
      display: flex; flex-direction: column; overflow: hidden;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      font-size: 14px;
    }
    #smcp-window.hidden { display: none; }
    #smcp-header {
      background: ${BRAND}; color: #fff;
      padding: 14px 16px; display: flex; align-items: center; gap: 10px;
      font-weight: 600; font-size: 15px; flex-shrink: 0;
    }
    #smcp-header span { flex: 1; }
    #smcp-close {
      background: none; border: none; color: #fff; cursor: pointer;
      font-size: 20px; line-height: 1; padding: 0;
    }
    #smcp-messages {
      flex: 1; overflow-y: auto; padding: 16px;
      display: flex; flex-direction: column; gap: 10px;
    }
    .smcp-msg {
      max-width: 80%; padding: 9px 13px; border-radius: 12px;
      line-height: 1.45; word-break: break-word;
    }
    .smcp-msg.bot {
      background: #f1f0fe; color: #1a1a2e; border-bottom-left-radius: 4px; align-self: flex-start;
    }
    .smcp-msg.user {
      background: ${BRAND}; color: #fff; border-bottom-right-radius: 4px; align-self: flex-end;
    }
    .smcp-msg.typing { color: #888; font-style: italic; }
    #smcp-input-row {
      padding: 10px 12px; border-top: 1px solid #eee;
      display: flex; gap: 8px; flex-shrink: 0;
    }
    #smcp-input {
      flex: 1; border: 1px solid #ddd; border-radius: 8px;
      padding: 8px 12px; font-size: 14px; outline: none;
      font-family: inherit; resize: none; line-height: 1.4;
    }
    #smcp-input:focus { border-color: ${BRAND}; }
    #smcp-send {
      background: ${BRAND}; color: #fff; border: none;
      border-radius: 8px; padding: 0 14px; cursor: pointer;
      font-size: 18px; transition: background 0.2s;
    }
    #smcp-send:hover { background: ${BRAND_DARK}; }
    #smcp-send:disabled { background: #ccc; cursor: default; }
    @media (max-width: 420px) {
      #smcp-window { width: calc(100vw - 24px); right: 12px; bottom: 80px; }
    }
  `;

  const WELCOME = "Hi! I'm the SquareMCP assistant. Ask me anything about connecting your AI agent to social platforms.";

  function inject() {
    const style = document.createElement('style');
    style.textContent = css;
    document.head.appendChild(style);

    document.body.insertAdjacentHTML('beforeend', `
      <button id="smcp-btn" aria-label="Chat with SquareMCP">
        <svg viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
          <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>
        </svg>
      </button>
      <div id="smcp-window" class="hidden">
        <div id="smcp-header">
          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>
          </svg>
          <span>SquareMCP Support</span>
          <button id="smcp-close">&times;</button>
        </div>
        <div id="smcp-messages"></div>
        <div id="smcp-input-row">
          <textarea id="smcp-input" rows="1" placeholder="Ask a question…"></textarea>
          <button id="smcp-send">&#9658;</button>
        </div>
      </div>
    `);

    const win = document.getElementById('smcp-window');
    const btn = document.getElementById('smcp-btn');
    const closeBtn = document.getElementById('smcp-close');
    const messages = document.getElementById('smcp-messages');
    const input = document.getElementById('smcp-input');
    const send = document.getElementById('smcp-send');

    const history = [];
    let busy = false;

    function addMsg(text, role, typing) {
      const div = document.createElement('div');
      div.className = 'smcp-msg ' + role + (typing ? ' typing' : '');
      div.textContent = text;
      messages.appendChild(div);
      messages.scrollTop = messages.scrollHeight;
      return div;
    }

    addMsg(WELCOME, 'bot');

    btn.addEventListener('click', () => {
      win.classList.toggle('hidden');
      if (!win.classList.contains('hidden')) input.focus();
    });
    closeBtn.addEventListener('click', () => win.classList.add('hidden'));

    async function submit() {
      const text = input.value.trim();
      if (!text || busy) return;
      busy = true;
      send.disabled = true;
      input.value = '';
      input.style.height = '';

      addMsg(text, 'user');
      history.push({ role: 'user', content: text });

      const indicator = addMsg('Typing…', 'bot', true);

      try {
        const res = await fetch(API, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ messages: history }),
        });
        const data = await res.json();
        const reply = data.reply || 'Sorry, something went wrong. Try again.';
        indicator.textContent = reply;
        indicator.classList.remove('typing');
        history.push({ role: 'assistant', content: reply });
      } catch {
        indicator.textContent = 'Network error. Please try again.';
        indicator.classList.remove('typing');
      }

      busy = false;
      send.disabled = false;
      messages.scrollTop = messages.scrollHeight;
    }

    send.addEventListener('click', submit);
    input.addEventListener('keydown', (e) => {
      if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); submit(); }
    });
    input.addEventListener('input', () => {
      input.style.height = '';
      input.style.height = Math.min(input.scrollHeight, 96) + 'px';
    });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', inject);
  } else {
    inject();
  }
})();