<!-- Thailand DTV AI Chatbot Widget -->
<div id="dtv-chat-widget" style="position: fixed; bottom: 20px; right: 20px; z-index: 9999; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;">
  <!-- Chat Button Trigger -->
  <button id="dtv-chat-trigger" style="width: 60px; height: 60px; border-radius: 30px; background: linear-gradient(135deg, #f59e0b, #d97706); border: none; cursor: pointer; box-shadow: 0 4px 20px rgba(217, 119, 6, 0.3); display: flex; align-items: center; justify-content: center; transition: all 0.3s ease;">
    <svg xmlns="http://www.w3.org/2000/svg" width="26" height="26" 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"></path></svg>
  </button>

  <!-- Chat Window (Hidden by Default) -->
  <div id="dtv-chat-window" style="display: none; width: 380px; height: 500px; border-radius: 16px; background: #0f172a; border: 1px solid #1e293b; box-shadow: 0 10px 30px rgba(0,0,0,0.5); flex-direction: column; position: absolute; bottom: 80px; right: 0; overflow: hidden; transition: all 0.3s ease;">
    <!-- Header -->
    <div style="background: #1e293b; padding: 16px; display: flex; align-items: center; justify-content: space-between; border-b: 1px solid #334155;">
      <div style="display: flex; align-items: center; gap: 10px;">
        <span style="font-size: 20px;"></span>
        <div>
          <h4 style="margin: 0; color: #fff; font-size: 14px; font-weight: bold;">DTV AI Assistant</h4>
          <span style="font-size: 10px; color: #10b981; display: flex; align-items: center; gap: 4px;">
            <span style="width: 6px; height: 6px; background: #10b981; border-radius: 50%; display: inline-block;"></span> Online
          </span>
        </div>
      </div>
      <button id="dtv-chat-close" style="background: none; border: none; color: #94a3b8; cursor: pointer; font-size: 18px;">&times;</button>
    </div>

    <!-- Messages Container -->
    <div id="dtv-chat-messages" style="flex: 1; padding: 16px; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; background: #090d16;">
      <div style="align-self: flex-start; background: #1e293b; color: #cbd5e1; padding: 10px 14px; border-radius: 12px 12px 12px 0; font-size: 13px; max-width: 80%; line-height: 1.4;">
        Sawasdee khrap! Welcome to the Thailand DTV Visa Portal. I am your specialized AI Assistant. How can I assist you with your 5-year Destination Thailand Visa (DTV) today?
      </div>
    </div>

    <!-- Input Area -->
    <div style="padding: 12px; border-top: 1px solid #1e293b; display: flex; gap: 8px; background: #0f172a;">
      <input id="dtv-chat-input" type="text" placeholder="Ask about costs, 500k THB proof, stay rules..." style="flex: 1; padding: 10px 14px; border-radius: 8px; border: 1px solid #334155; background: #020617; color: #fff; font-size: 13px; outline: none;" />
      <button id="dtv-chat-send" style="background: #d97706; border: none; border-radius: 8px; padding: 0 14px; cursor: pointer; display: flex; align-items: center; justify-content: center;">
        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"></line><polygon points="22 2 15 22 11 13 2 9 22 2"></polygon></svg>
      </button>
    </div>
  </div>
</div>

<script>
  (function() {
    const trigger = document.getElementById('dtv-chat-trigger');
    const windowEl = document.getElementById('dtv-chat-window');
    const closeBtn = document.getElementById('dtv-chat-close');
    const sendBtn = document.getElementById('dtv-chat-send');
    const inputEl = document.getElementById('dtv-chat-input');
    const messagesContainer = document.getElementById('dtv-chat-messages');

    // Create a stable session ID for the browser session
    let sessionId = sessionStorage.getItem('dtv_chat_session_id');
    if (!sessionId) {
      sessionId = 'web_' + Math.random().toString(36).substring(2, 11);
      sessionStorage.setItem('dtv_chat_session_id', sessionId);
    }

    let chatHistory = [];

    // Toggle Chat Window
    trigger.addEventListener('click', () => {
      const isHidden = windowEl.style.display === 'none';
      windowEl.style.display = isHidden ? 'flex' : 'none';
      if (isHidden) inputEl.focus();
    });

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

    // Send Message logic
    async function sendMessage() {
      const text = inputEl.value.trim();
      if (!text) return;

      inputEl.value = '';

      // Render User Message
      appendMessage(text, 'user');
      
      // Render typing loader
      const loaderId = appendTypingIndicator();

      try {
        const response = await fetch('https://ais-pre-ua5vfaf4oipf7xysfyk33p-867092543159.asia-southeast1.run.app/api/chat', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            sessionId: sessionId,
            message: text,
            history: chatHistory
          })
        });

        const data = await response.json();
        removeTypingIndicator(loaderId);

        if (data.reply) {
          appendMessage(data.reply, 'model');
          chatHistory.push({ role: 'user', text: text });
          chatHistory.push({ role: 'model', text: data.reply });
        } else {
          appendMessage("I am having trouble connecting to the service. Please try again.", 'model');
        }
      } catch (err) {
        removeTypingIndicator(loaderId);
        appendMessage("Connection error. Please try again.", 'model');
      }
    }

    sendBtn.addEventListener('click', sendMessage);
    inputEl.addEventListener('keypress', (e) => {
      if (e.key === 'Enter') sendMessage();
    });

    function appendMessage(text, sender) {
      const div = document.createElement('div');
      div.style.alignSelf = sender === 'user' ? 'flex-end' : 'flex-start';
      div.style.background = sender === 'user' ? '#d97706' : '#1e293b';
      div.style.color = sender === 'user' ? '#000' : '#cbd5e1';
      div.style.fontWeight = sender === 'user' ? '600' : 'normal';
      div.style.padding = '10px 14px';
      div.style.borderRadius = sender === 'user' ? '12px 12px 0 12px' : '12px 12px 12px 0';
      div.style.fontSize = '13px';
      div.style.maxWidth = '80%';
      div.style.lineHeight = '1.4';
      div.style.wordBreak = 'break-word';
      div.innerText = text;
      messagesContainer.appendChild(div);
      messagesContainer.scrollTop = messagesContainer.scrollHeight;
    }

    function appendTypingIndicator() {
      const id = 'loader_' + Date.now();
      const div = document.createElement('div');
      div.id = id;
      div.style.alignSelf = 'flex-start';
      div.style.background = '#1e293b';
      div.style.color = '#94a3b8';
      div.style.padding = '10px 14px';
      div.style.borderRadius = '12px 12px 12px 0';
      div.style.fontSize = '12px';
      div.innerText = "DTV Assistant is typing...";
      messagesContainer.appendChild(div);
      messagesContainer.scrollTop = messagesContainer.scrollHeight;
      return id;
    }

    function removeTypingIndicator(id) {
      const el = document.getElementById(id);
      if (el) el.remove();
    }
  })();
</script>