(function() {
  const AGENT_ID = "692da0151980498cdf0f59c3";
  const API_URL = "https://glav-bot.ru/api/functions";
  
  // Persist Visitor ID
  let VISITOR_ID = localStorage.getItem('chat_visitor_id_' + AGENT_ID);
  if (!VISITOR_ID) {
      VISITOR_ID = 'visitor_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
      localStorage.setItem('chat_visitor_id_' + AGENT_ID, VISITOR_ID);
  }
  
  const WIDGET_COLOR = "#0d0d0d";
  const WELCOME_MESSAGE = "Привет! Как могу помочь?";
  const AGENT_NAME = "Summator Support";
  
  console.log('ChatBot Init:', { AGENT_ID, API_URL }); // Debug log

  let isOpen = false;
  let messages = [];
  
  if (document.getElementById('chatbot-widget-root')) return;

  const root = document.createElement('div');
  root.id = 'chatbot-widget-root';
  document.body.appendChild(root);

  const style = document.createElement('style');
  style.textContent = `
    #chatbot-widget-root { font-family: system-ui, -apple-system, sans-serif; }
    #chatbot-widget-root * { box-sizing: border-box; }
    #chatbot-button { position: fixed; bottom: 20px; right: 20px; width: 60px; height: 60px; 
      border-radius: 50%; background: ${WIDGET_COLOR}; border: none; cursor: pointer; 
      box-shadow: 0 4px 12px rgba(0,0,0,0.15); z-index: 2147483646; display: flex; align-items: center; 
      justify-content: center; transition: transform 0.2s; }
    #chatbot-button:hover { transform: scale(1.05); }
    #chatbot-button svg { width: 28px; height: 28px; fill: white; }
    #chatbot-window { position: fixed; bottom: 90px; right: 20px; width: 380px; height: 600px; 
      max-height: calc(100vh - 110px);
      background: white; border-radius: 16px; box-shadow: 0 8px 32px rgba(0,0,0,0.15); 
      display: none; flex-direction: column; z-index: 2147483647; 
      opacity: 0; transform: translateY(20px); transition: opacity 0.3s, transform 0.3s; }
    #chatbot-window.open { display: flex; opacity: 1; transform: translateY(0); }
    #chatbot-header { background: ${WIDGET_COLOR}; color: white; padding: 16px; 
      border-radius: 16px 16px 0 0; font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
    #chatbot-close { background: none; border: none; color: white; cursor: pointer; opacity: 0.8; padding: 4px; }
    #chatbot-close:hover { opacity: 1; }
    #chatbot-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
    .message { max-width: 85%; padding: 10px 14px; font-size: 14px; line-height: 1.5; }
    .message.user { align-self: flex-end; background: #e5e7eb; color: #1f2937; 
      border-radius: 16px 16px 4px 16px; }
    .message.assistant { align-self: flex-start; background: #f3f4f6; color: #1f2937; 
      border-radius: 16px 16px 16px 4px; }
    .message.assistant strong { font-weight: 600; }
    .message.assistant p { margin: 0; }
    #chatbot-input-area { border-top: 1px solid #e5e7eb; padding: 12px; display: flex; gap: 8px; background: white; border-radius: 0 0 16px 16px; }
    #chatbot-input { flex: 1; border: 1px solid #e5e7eb; border-radius: 8px; padding: 10px; 
      outline: none; font-size: 14px; transition: border-color 0.2s; }
    #chatbot-input:focus { border-color: ${WIDGET_COLOR}; }
    #chatbot-send { background: ${WIDGET_COLOR}; color: white; border: none; 
      padding: 0 12px; border-radius: 8px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
    #chatbot-send:disabled { opacity: 0.5; cursor: not-allowed; }
    
    @media (max-width: 480px) {
      #chatbot-window { width: 100%; height: 100%; bottom: 0; right: 0; border-radius: 0; max-height: 100vh; }
      #chatbot-header { border-radius: 0; }
      #chatbot-button { bottom: 20px; right: 20px; }
    }
  `;
  document.head.appendChild(style);
  
  const button = document.createElement('button');
  button.id = 'chatbot-button';
  button.innerHTML = '<svg viewBox="0 0 24 24"><path d="M20 2H4c-1.1 0-2 .9-2 2v18l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2z"/></svg>';
  button.onclick = toggleChat;
  root.appendChild(button);
  
  const chatWindow = document.createElement('div');
  chatWindow.id = 'chatbot-window';
  chatWindow.innerHTML = `
    <div id="chatbot-header">
      <span>${AGENT_NAME}</span>
      <button id="chatbot-close">
        <svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
      </button>
    </div>
    <div id="chatbot-messages"></div>
    <div id="chatbot-input-area">
      <input id="chatbot-input" placeholder="Напишите сообщение..." autocomplete="off" />
      <button id="chatbot-send">
        <svg viewBox="0 0 24 24" width="20" height="20" fill="currentColor"><path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/></svg>
      </button>
    </div>
  `;
  root.appendChild(chatWindow);

  document.getElementById('chatbot-close').onclick = toggleChat;
  const input = document.getElementById('chatbot-input');
  const sendBtn = document.getElementById('chatbot-send');
  const messagesDiv = document.getElementById('chatbot-messages');
  
  let lastMessageTimestamp = null;
  let pollInterval = null;

  // Poll for new messages
  async function pollMessages() {
      if (!isOpen) return;
      try {
          const response = await fetch(API_URL + '/getWebsiteMessages', {
              method: 'POST',
              headers: { 'Content-Type': 'application/json' },
              body: JSON.stringify({ 
                  agentId: AGENT_ID, 
                  visitorId: VISITOR_ID, 
                  afterTimestamp: lastMessageTimestamp 
              })
          });
          const data = await response.json();
          if (data.messages && data.messages.length > 0) {
              data.messages.forEach(msg => {
                  // Update timestamp to latest
                  if (!lastMessageTimestamp || new Date(msg.timestamp) > new Date(lastMessageTimestamp)) {
                      lastMessageTimestamp = msg.timestamp;
                  }
                  
                  // Message Handling Logic
                  const msgContent = msg.content;
                  const msgRole = msg.role;

                  // Determine display role
                  const displayRole = (msgRole === 'operator' || msgRole === 'assistant') ? 'assistant' : 'user';

                  // Check for duplicates in recent history
                  // We compare against raw content if possible, but we only have display content in DOM/memory.
                  // Note: We modify operator content with prefix.
                  
                  const isOperator = msgRole === 'operator';
                  const contentToCheck = isOperator ? '👮 ' + msgContent : msgContent;

                  const isDuplicate = messages.slice(-10).some(m => m.content === contentToCheck && m.role === displayRole);

                  if (!isDuplicate) {
                      addMessage(displayRole, contentToCheck);
                  }
              });
          }
      } catch (e) {
          console.error('Poll error', e);
      }
  }

  function toggleChat() {
    isOpen = !isOpen;
    chatWindow.classList.toggle('open', isOpen);
    button.style.transform = isOpen ? 'scale(0)' : 'scale(1)';
    
    if (isOpen) {
        if (messages.length === 0) {
             // Initial load / Welcome
             pollMessages().then(() => {
                 if (messages.length === 0) addMessage('assistant', WELCOME_MESSAGE);
             });
        }
        pollInterval = setInterval(pollMessages, 3000);
        setTimeout(() => input.focus(), 100);
    } else {
        clearInterval(pollInterval);
    }
  }
  
  function addMessage(role, content) {
    messages.push({ role, content });
    const msgDiv = document.createElement('div');
    msgDiv.className = 'message ' + role;
    
    if (role === 'assistant') {
      let html = content
        .replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>')
        .replace(/\n/g, '<br>');
      msgDiv.innerHTML = html;
    } else {
      msgDiv.textContent = content;
    }
    
    messagesDiv.appendChild(msgDiv);
    messagesDiv.scrollTop = messagesDiv.scrollHeight;
  }
  
  async function sendMessage() {
    const message = input.value.trim();
    if (!message) return;
    
    const externalId = 'web_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
    
    input.value = '';
    input.disabled = true;
    sendBtn.disabled = true;
    
    addMessage('user', message);
    
    try {
      const response = await fetch(API_URL + '/sendWebsiteMessage', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ agentId: AGENT_ID, visitorId: VISITOR_ID, message, externalId })
      });
      
      if (!response.ok) {
        let errorDetails = response.status + ' ' + response.statusText;
        try {
            const errData = await response.json();
            if (errData.error) errorDetails = errData.error;
        } catch (e) {}
        throw new Error(errorDetails);
      }
      
      const data = await response.json();
      if (data.response) {
        addMessage('assistant', data.response);
      }
    } catch (error) {
      console.error('Chat error:', error);
      addMessage('assistant', 'Ошибка: ' + error.message + ' (' + API_URL + ')');
    } finally {
      input.disabled = false;
      sendBtn.disabled = false;
      input.focus();
    }
  }
  
  sendBtn.onclick = sendMessage;
  input.onkeypress = (e) => {
    if (e.key === 'Enter') sendMessage();
  };
})();