(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 STORAGE_KEY = 'paradiz_web_chat_history_v1';
    const CLIENT_ID_KEY = 'paradiz_web_chat_client_id_v1';
    const MAX_MESSAGES = 80;

    const getClientId = () => {
      try {
        let id = localStorage.getItem(CLIENT_ID_KEY);
        if(!id){
          id = 'c_' + Date.now().toString(36) + '_' + Math.random().toString(36).slice(2, 10);
          localStorage.setItem(CLIENT_ID_KEY, id);
        }
        return id;
      } catch(_) {
        return 'c_fallback';
      }
    };

    const saveHistory = () => {
      try {
        const items = Array.from(log.querySelectorAll('.paradiz-msg')).map((el) => ({
          text: el.textContent || '',
          type: el.classList.contains('paradiz-user') ? 'user' : 'bot'
        }));
        const trimmed = items.slice(-MAX_MESSAGES);
        localStorage.setItem(STORAGE_KEY, JSON.stringify(trimmed));
      } catch(_) {}
    };

    const restoreHistory = () => {
      try {
        const raw = localStorage.getItem(STORAGE_KEY);
        if(!raw) return false;
        const arr = JSON.parse(raw);
        if(!Array.isArray(arr) || !arr.length) return false;
        log.innerHTML = '';
        for(const item of arr){
          const p = document.createElement('p');
          p.className = 'paradiz-msg ' + (item.type === 'user' ? 'paradiz-user' : 'paradiz-bot');
          p.textContent = String(item.text || '');
          log.appendChild(p);
        }
        log.scrollTop = log.scrollHeight;
        return true;
      } catch(_) {
        return false;
      }
    };

    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;
      saveHistory();
    };

    restoreHistory();

    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 = '';
      const typingEl = document.createElement('p');
      typingEl.className = 'paradiz-msg paradiz-bot';
      typingEl.textContent = 'Печатают…';
      log.appendChild(typingEl);
      log.scrollTop = log.scrollHeight;

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

        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(typingEl && typingEl.parentNode) typingEl.parentNode.removeChild(typingEl);
        if(data && data.success){
          addMsg((data.data && data.data.answer) ? data.data.answer : 'Нет ответа', 'bot');
          const b64 = data?.data?.booking_doc_base64 || '';
          const name = data?.data?.booking_doc_name || 'booking.docx';
          if(b64){
            addMsg('Лист предварительной брони сформирован. Скачайте файл ниже 👇', 'bot');
            const a = document.createElement('a');
            a.href = 'data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,' + b64;
            a.download = name;
            a.textContent = '📄 Скачать лист предварительной брони';
            a.style.display = 'block';
            a.style.marginBottom = '8px';
            log.appendChild(a);
            saveHistory();
          }
        } else {
          addMsg((data && data.data && data.data.message) ? data.data.message : 'Ошибка', 'bot');
        }
      } catch (e) {
        if(typingEl && typingEl.parentNode) typingEl.parentNode.removeChild(typingEl);
        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();
  }
})();