(function () {
  const form = document.getElementById('contactForm');
  if (!form) return;

  const dropzone    = document.getElementById('dropzone');
  const photoInput  = document.getElementById('photoInput');
  const photoPreview = document.getElementById('photoPreview');
  const photoError  = document.getElementById('photoError');
  const formAlert   = document.getElementById('formAlert');
  const submitBtn   = document.getElementById('submitBtn');
  const textarea    = form.querySelector('textarea[name="message"]');
  const phoneInput  = form.querySelector('input[name="phone"]');
  let selectedFiles = [];

  // Textarea auto-resize
  textarea.style.overflow = 'hidden';
  textarea.addEventListener('input', function () {
    this.style.height = 'auto';
    this.style.height = this.scrollHeight + 'px';
  });

  // Phone auto-format
  phoneInput.addEventListener('input', function () {
    const digits = this.value.replace(/\D/g, '').slice(0, 10);
    if (digits.length >= 7)      this.value = '(' + digits.slice(0,3) + ') ' + digits.slice(3,6) + '-' + digits.slice(6);
    else if (digits.length >= 4) this.value = '(' + digits.slice(0,3) + ') ' + digits.slice(3);
    else                         this.value = digits;
  });

  // Clear inline errors on input
  form.querySelectorAll('.input, .textarea').forEach(el => {
    el.addEventListener('input', () => clearErr(el));
  });

  function setErr(input, msg) {
    input.classList.add('is-danger');
    const el = document.getElementById('err-' + input.name);
    if (el) { el.textContent = msg; el.style.display = ''; }
  }

  function clearErr(input) {
    input.classList.remove('is-danger');
    const el = document.getElementById('err-' + input.name);
    if (el) el.style.display = 'none';
  }

  function validate() {
    let ok = true;

    const firstName = form.querySelector('[name="firstName"]');
    if (!firstName.value.trim()) { setErr(firstName, 'Please enter your first name.'); ok = false; }
    else clearErr(firstName);

    const lastName = form.querySelector('[name="lastName"]');
    if (!lastName.value.trim()) { setErr(lastName, 'Please enter your last name.'); ok = false; }
    else clearErr(lastName);

    const email = form.querySelector('[name="email"]');
    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email.value.trim())) {
      setErr(email, 'Please enter a valid email address.'); ok = false;
    } else clearErr(email);

    const phone = form.querySelector('[name="phone"]');
    if (phone.value.replace(/\D/g, '').length < 10) {
      setErr(phone, 'Please enter a valid 10-digit phone number.'); ok = false;
    } else clearErr(phone);

    const msg = form.querySelector('[name="message"]');
    if (!msg.value.trim()) { setErr(msg, 'Please enter a message.'); ok = false; }
    else clearErr(msg);

    return ok;
  }

  // Dropzone
  dropzone.addEventListener('click', () => photoInput.click());
  dropzone.addEventListener('dragover', e => { e.preventDefault(); dropzone.classList.add('drag-over'); });
  dropzone.addEventListener('dragleave', () => dropzone.classList.remove('drag-over'));
  dropzone.addEventListener('drop', e => {
    e.preventDefault();
    dropzone.classList.remove('drag-over');
    addFiles(Array.from(e.dataTransfer.files));
  });
  photoInput.addEventListener('change', () => {
    addFiles(Array.from(photoInput.files));
    photoInput.value = '';
  });

  function addFiles(newFiles) {
    const images = newFiles.filter(f => f.type.startsWith('image/'));
    const tooBig = images.filter(f => f.size > 10 * 1024 * 1024);
    if (tooBig.length) showAlert('One or more photos exceed 10 MB and were skipped.', 'is-warning');
    const ok = images.filter(f => f.size <= 10 * 1024 * 1024);
    const combined = [...selectedFiles, ...ok];
    photoError.style.display = combined.length > 3 ? '' : 'none';
    selectedFiles = combined.slice(0, 3);
    renderPreviews();
  }

  function renderPreviews() {
    photoPreview.innerHTML = '';
    selectedFiles.forEach((file, i) => {
      const url = URL.createObjectURL(file);
      const wrap = document.createElement('div');
      wrap.className = 'preview-wrap';
      const img = document.createElement('img');
      img.src = url;
      const btn = document.createElement('button');
      btn.type = 'button';
      btn.className = 'remove-btn';
      btn.innerHTML = '&times;';
      btn.addEventListener('click', () => {
        URL.revokeObjectURL(url);
        selectedFiles.splice(i, 1);
        photoError.style.display = 'none';
        renderPreviews();
      });
      wrap.appendChild(img);
      wrap.appendChild(btn);
      photoPreview.appendChild(wrap);
    });
  }

  // Submit
  form.addEventListener('submit', async e => {
    e.preventDefault();
    formAlert.style.display = 'none';

    if (!validate()) {
      showAlert('Please correct the errors below.', 'is-danger');
      // Scroll to first error
      const first = form.querySelector('.is-danger');
      if (first) first.scrollIntoView({ behavior: 'smooth', block: 'center' });
      return;
    }

    const fd = new FormData();
    fd.append('firstName', form.querySelector('[name="firstName"]').value.trim());
    fd.append('lastName',  form.querySelector('[name="lastName"]').value.trim());
    fd.append('email',   form.querySelector('[name="email"]').value.trim());
    fd.append('phone',   form.querySelector('[name="phone"]').value.trim());
    fd.append('message', form.querySelector('[name="message"]').value.trim());
    const et = form.querySelector('[name="eventType"]');
    if (et)  fd.append('eventType',  et.value);
    const ed = form.querySelector('[name="eventDate"]');
    if (ed)  fd.append('eventDate',  ed.value);
    const hp = form.querySelector('[name="website"]');
    if (hp)  fd.append('website',    hp.value);
    selectedFiles.forEach(f => fd.append('photos', f));

    submitBtn.classList.add('is-loading');
    submitBtn.disabled = true;

    try {
      const res  = await fetch('/api/contact', { method: 'POST', body: fd });
      const data = await res.json();
      if (data.success) {
        showAlert("Message sent! We’ll get back to you soon. Check your email for a confirmation.", 'is-success');
        form.reset();
        selectedFiles = [];
        renderPreviews();
        textarea.style.height = 'auto';
      } else {
        showAlert(data.message || 'Something went wrong. Please try again.', 'is-danger');
      }
    } catch {
      showAlert('Network error. Please try again or email us directly.', 'is-danger');
    } finally {
      submitBtn.classList.remove('is-loading');
      submitBtn.disabled = false;
    }
  });

  function showAlert(msg, cls) {
    formAlert.className  = 'notification ' + cls;
    formAlert.textContent = msg;
    formAlert.style.display = '';
    formAlert.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
  }
})();