// --- State ---
let sessionId = null;
let models = [];
let currentModel = null;

const REQUEST_LIMIT = 3;
const REQUEST_WINDOW_MS = 30 * 1000; // 1 minute
let requestTimestamps = [];

// --- DOM Elements ---
const modal = document.getElementById('modal');
const apiKeyInput = document.getElementById('apiKeyInput');
const loginBtn = document.getElementById('loginBtn');
const loginError = document.getElementById('loginError');
const app = document.getElementById('app');
const chatContainer = document.getElementById('chatContainer');
const toolToggle = document.getElementById('toolToggle');
const inputForm = document.getElementById('inputForm');
const userInput = document.getElementById('userInput');
const modelSelect = document.getElementById('modelSelect');
const logoutBtn = document.getElementById('logoutBtn');
const typingIndicator = document.getElementById('typingIndicator');

let toolUse = true;

// --- Helpers ---
function canSendRequest() {
    const now = Date.now();
    // Remove timestamps older than 1 minute
    requestTimestamps = requestTimestamps.filter(ts => now - ts < REQUEST_WINDOW_MS);
    return requestTimestamps.length < REQUEST_LIMIT;
  }
  
  function recordRequest() {
    requestTimestamps.push(Date.now());
  }

function scrollToBottom() {
  chatContainer.scrollTop = chatContainer.scrollHeight;
}

function addMessage(text, sender) {
  const msgDiv = document.createElement('div');
  msgDiv.className = 'message ' + sender;
  const bubble = document.createElement('div');
  bubble.className = 'bubble';
  bubble.textContent = text;
  msgDiv.appendChild(bubble);
  chatContainer.appendChild(msgDiv);
  scrollToBottom();
}

function setTyping(isTyping) {
  typingIndicator.classList.toggle('hidden', !isTyping);
  scrollToBottom();
}

function showError(msg) {
  loginError.textContent = msg || '';
}

toolToggle.addEventListener('change', function() {
    toolUse = toolToggle.checked;
  });

// --- Auth & Model Selection ---
loginBtn.onclick = async function () {
  const apiKey = apiKeyInput.value.trim();
  if (!apiKey) { showError('API key required.'); return; }
  loginBtn.disabled = true;
  showError('');
  try {
    const res = await fetch('/init', {
      method: 'POST',
      headers: {'Content-Type': 'application/json'},
      body: JSON.stringify({api_key: apiKey})
    });
    const data = await res.json();
    if (!data.success) { showError(data.error || 'Login failed.'); loginBtn.disabled = false; return; }
    sessionId = data.session_id;
    models = data.models || [];
    // Populate model dropdown
    modelSelect.innerHTML = '';
    models.forEach(m => {
      const opt = document.createElement('option');
      opt.value = m;
      opt.textContent = m;
      modelSelect.appendChild(opt);
    });
    currentModel = models[0];
    modelSelect.value = currentModel;
    // Show app, hide modal
    modal.classList.add('hidden');
    app.classList.remove('hidden');
    chatContainer.innerHTML = '';
    userInput.focus();
  } catch (e) {
    showError('Network error.');
    loginBtn.disabled = false;
  }
};

modelSelect.onchange = function () {
  currentModel = modelSelect.value;
};

// --- Chat Logic ---
inputForm.onsubmit = async function (e) {
    e.preventDefault();
    const text = userInput.value.trim();
    if (!text) return;

    if (!canSendRequest()) {
        addMessage('[Rate limit] Please wait: only 4 requests per minute allowed.', 'bot');
        return;
      }
      recordRequest();

    addMessage(text, 'user');
    userInput.value = '';
    setTyping(true);
    try {
      const res = await fetch('/chat', {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({
          session_id: sessionId,
          query: text,
          tool_use: toolUse, // <-- Use the toggle value here
          model: currentModel
        })
      });
      const data = await res.json();
      setTyping(false);
      if (data.error) {
        addMessage('[Error] ' + data.error, 'bot');
        return;
      }
      addMessage(data.output, 'bot');
    } catch (e) {
      setTyping(false);
      addMessage('[Network error]', 'bot');
    }
  };

// --- Logout Logic ---
logoutBtn.onclick = async function () {
  await logoutAndReset();
};

async function logoutAndReset() {
  if (sessionId) {
    try {
      await fetch('/logout', {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({session_id: sessionId})
      });
    } catch {}
    sessionId = null;
    models = [];
    currentModel = null;
  }
  app.classList.add('hidden');
  modal.classList.remove('hidden');
  apiKeyInput.value = '';
  chatContainer.innerHTML = '';
  showError('');
  loginBtn.disabled = false;
}

// --- Auto logout on exit ---
window.addEventListener('beforeunload', logoutAndReset);

// --- UX: Enter key in modal input triggers login ---
apiKeyInput.addEventListener('keyup', function(e) {
  if (e.key === 'Enter') loginBtn.click();
});