function showState(state) {
  ['signupInitial', 'signupLoading', 'signupResult'].forEach(function(id) {
    document.getElementById(id).classList.remove('active');
  });
  document.getElementById(state).classList.add('active');
}

function openSignup() {
  document.getElementById('signupModal').classList.add('active');
  showState('signupInitial');
  document.getElementById('signupError').style.display = 'none';
}

function closeSignup() {
  document.getElementById('signupModal').classList.remove('active');
}

async function submitSignup() {
  var errEl = document.getElementById('signupError');
  var btn = document.getElementById('signupBtn');
  errEl.style.display = 'none';
  btn.disabled = true;
  showState('signupLoading');

  try {
    var res = await fetch('/v1/signup/free', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({})
    });
    var data = await res.json();

    if (!res.ok) {
      showState('signupInitial');
      errEl.textContent = data.error || 'Something went wrong. Please try again.';
      errEl.style.display = 'block';
      btn.disabled = false;
      return;
    }

    document.getElementById('apiKeyText').textContent = data.apiKey;
    showState('signupResult');
  } catch (err) {
    showState('signupInitial');
    errEl.textContent = 'Network error. Please try again.';
    errEl.style.display = 'block';
    btn.disabled = false;
  }
}

function copyKey() {
  var key = document.getElementById('apiKeyText').textContent;
  var btn = document.getElementById('copyBtn');
  function showCopied() {
    btn.textContent = '✓ Copied!';
    setTimeout(function() { btn.textContent = 'Copy'; }, 2000);
  }
  try {
    navigator.clipboard.writeText(key).then(showCopied).catch(function() {
      var ta = document.createElement('textarea');
      ta.value = key; ta.style.position = 'fixed'; ta.style.opacity = '0';
      document.body.appendChild(ta); ta.select();
      document.execCommand('copy');
      document.body.removeChild(ta);
      showCopied();
    });
  } catch(e) {
    showCopied();
  }
}

async function checkout() {
  try {
    var res = await fetch('/v1/billing/checkout', { method: 'POST' });
    var data = await res.json();
    if (data.url) window.location.href = data.url;
    else alert('Checkout is not available yet. Please try again later.');
  } catch (err) {
    alert('Something went wrong. Please try again.');
  }
}

document.addEventListener('DOMContentLoaded', function() {
  document.getElementById('btn-signup').addEventListener('click', openSignup);
  document.getElementById('btn-signup-2').addEventListener('click', openSignup);
  document.getElementById('btn-checkout').addEventListener('click', checkout);
  document.getElementById('btn-close-signup').addEventListener('click', closeSignup);
  document.getElementById('signupBtn').addEventListener('click', submitSignup);
  document.getElementById('copyBtn').addEventListener('click', copyKey);
  document.getElementById('signupModal').addEventListener('click', function(e) {
    if (e.target === this) closeSignup();
  });
  // Smooth scroll for nav links
  document.querySelectorAll('a[href^="#"]').forEach(function(a) {
    a.addEventListener('click', function(e) {
      e.preventDefault();
      var el = document.querySelector(this.getAttribute('href'));
      if (el) el.scrollIntoView({ behavior: 'smooth' });
    });
  });
});