// Aria Chat Widget - Dealspace Product Assistant
(function() {
  'use strict';

  // Generate or retrieve session ID
  function getSessionId() {
    let sessionId = sessionStorage.getItem('aria_session_id');
    if (!sessionId) {
      sessionId = 'aria_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
      sessionStorage.setItem('aria_session_id', sessionId);
    }
    return sessionId;
  }

  // Chat state
  const state = {
    isOpen: false,
    isLoading: false,
    history: [],
    sessionId: getSessionId()
  };

  // Create chat widget HTML
  function createWidget() {
    // Chat button
    const button = document.createElement('button');
    button.id = 'aria-chat-button';
    button.setAttribute('aria-label', 'Open chat with Aria');
    button.innerHTML = `
      <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
        <path d="M20 2H4c-1.1 0-2 .9-2 2v18l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H6l-2 2V4h16v12z"/>
      </svg>
    `;

    // Chat panel
    const panel = document.createElement('div');
    panel.id = 'aria-chat-panel';
    panel.innerHTML = `
      <div id="aria-chat-header">
        <div id="aria-avatar"><span>A</span></div>
        <div id="aria-header-text">
          <h3>Aria</h3>
          <p>Dealspace Assistant</p>
        </div>
        <button id="aria-close-btn" aria-label="Close chat">&times;</button>
      </div>
      <div id="aria-chat-messages"></div>
      <div id="aria-chat-input">
        <input type="text" id="aria-message-input" placeholder="Ask about Dealspace..." autocomplete="off">
        <button id="aria-send-btn" aria-label="Send message">
          <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
            <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/>
          </svg>
        </button>
      </div>
    `;

    document.body.appendChild(button);
    document.body.appendChild(panel);

    // Event listeners
    button.addEventListener('click', toggleChat);
    document.getElementById('aria-close-btn').addEventListener('click', toggleChat);
    document.getElementById('aria-send-btn').addEventListener('click', sendMessage);
    document.getElementById('aria-message-input').addEventListener('keypress', function(e) {
      if (e.key === 'Enter' && !e.shiftKey) {
        e.preventDefault();
        sendMessage();
      }
    });
  }

  function toggleChat() {
    const panel = document.getElementById('aria-chat-panel');
    state.isOpen = !state.isOpen;
    
    if (state.isOpen) {
      panel.classList.add('open');
      // Show welcome message if no history
      if (state.history.length === 0) {
        addMessage("Hi, I'm Aria! I can answer questions about Dealspace — features, pricing, security, or how it works. What would you like to know?", 'assistant');
      }
      document.getElementById('aria-message-input').focus();
    } else {
      panel.classList.remove('open');
    }
  }

  function addMessage(content, role) {
    const messagesContainer = document.getElementById('aria-chat-messages');
    const messageDiv = document.createElement('div');
    messageDiv.className = 'aria-message ' + role;
    messageDiv.textContent = content;
    messagesContainer.appendChild(messageDiv);
    messagesContainer.scrollTop = messagesContainer.scrollHeight;

    // Store in history (exclude welcome message)
    if (role !== 'assistant' || state.history.length > 0 || content !== "Hi, I'm Aria! I can answer questions about Dealspace — features, pricing, security, or how it works. What would you like to know?") {
      state.history.push({ role: role, content: content });
      // Keep only last 6 messages
      if (state.history.length > 6) {
        state.history = state.history.slice(-6);
      }
    }
  }

  function showTyping() {
    const messagesContainer = document.getElementById('aria-chat-messages');
    const typingDiv = document.createElement('div');
    typingDiv.id = 'aria-typing-indicator';
    typingDiv.className = 'aria-typing';
    typingDiv.innerHTML = '<span></span><span></span><span></span>';
    messagesContainer.appendChild(typingDiv);
    messagesContainer.scrollTop = messagesContainer.scrollHeight;
  }

  function hideTyping() {
    const typingIndicator = document.getElementById('aria-typing-indicator');
    if (typingIndicator) {
      typingIndicator.remove();
    }
  }

  async function sendMessage() {
    const input = document.getElementById('aria-message-input');
    const sendBtn = document.getElementById('aria-send-btn');
    const message = input.value.trim();

    if (!message || state.isLoading) return;

    // Add user message
    addMessage(message, 'user');
    input.value = '';

    // Show loading state
    state.isLoading = true;
    sendBtn.disabled = true;
    showTyping();

    try {
      const response = await fetch('/api/chat', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({
          session_id: state.sessionId,
          message: message,
          history: state.history.slice(0, -1) // Exclude the message we just added
        })
      });

      hideTyping();

      if (!response.ok) {
        const error = await response.json();
        throw new Error(error.error || 'Something went wrong');
      }

      const data = await response.json();
      addMessage(data.reply, 'assistant');

    } catch (error) {
      hideTyping();
      console.error('Chat error:', error);
      addMessage("Sorry, I'm having trouble connecting. Please try again in a moment.", 'assistant');
    } finally {
      state.isLoading = false;
      sendBtn.disabled = false;
      input.focus();
    }
  }

  // Initialize when DOM is ready
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', createWidget);
  } else {
    createWidget();
  }
})();