(function(){
  function init(){
    const fab = document.getElementById('paradiz-web-chat-fab');
    const modal = document.getElementById('paradiz-web-chat-modal');
    const closeBtn = document.getElementById('paradiz-web-chat-close');
    const sendBtn = document.getElementById('paradiz-web-chat-send');
    const input = document.getElementById('paradiz-web-chat-input');
    const log = document.getElementById('paradiz-web-chat-log');

    if(!fab || !modal || !closeBtn || !sendBtn || !input || !log) return;

    const addMsg = (text, type) => {
      const p = document.createElement('p');
      p.className = 'paradiz-msg ' + (type === 'user' ? 'paradiz-user' : 'paradiz-bot');
      p.textContent = text;
      log.appendChild(p);
      log.scrollTop = log.scrollHeight;
    };

    fab.addEventListener('click', () => {
      modal.style.display = (modal.style.display === 'block') ? 'none' : 'block';
      if(modal.style.display === 'block') input.focus();
    });

    closeBtn.addEventListener('click', () => {
      modal.style.display = 'none';
    });

    const sendQuestion = async () => {
      const q = input.value.trim();
      if(!q){
        addMsg('Введите вопрос.', 'bot');
        return;
      }

      addMsg('Вы: ' + q, 'user');
      input.value = '';
      addMsg('Печатают…', 'bot');

      try {
        const body = new URLSearchParams();
        body.set('action', 'paradiz_web_chat');
        body.set('nonce', (window.ParadizWebChatCfg && ParadizWebChatCfg.nonce) ? ParadizWebChatCfg.nonce : '');
        body.set('question', q);

        const resp = await fetch((window.ParadizWebChatCfg && ParadizWebChatCfg.ajaxUrl) ? ParadizWebChatCfg.ajaxUrl : '/wp-admin/admin-ajax.php', {
          method: 'POST',
          headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
          body: body.toString(),
          credentials: 'same-origin'
        });

        const data = await resp.json();
        if(data && data.success){
          addMsg((data.data && data.data.answer) ? data.data.answer : 'Нет ответа', 'bot');
        } else {
          addMsg((data && data.data && data.data.message) ? data.data.message : 'Ошибка', 'bot');
        }
      } catch (e) {
        addMsg('Сетевая ошибка: ' + (e && e.message ? e.message : 'unknown'), 'bot');
      }
    };

    sendBtn.addEventListener('click', sendQuestion);
    input.addEventListener('keydown', (e) => {
      if(e.key === 'Enter' && !e.shiftKey){
        e.preventDefault();
        sendQuestion();
      }
    });
  }

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