(function(){

const form = document.getElementById('leadForm');
if(!form) return;
let formSubmitting = false;
function isValidEmail(email){
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
}

function isValidPhone(phone){
  return /^[2-9][0-9]{9}$/.test(phone);
}

function isNumeric(value){
  return !isNaN(value) && value.trim() !== '';
}

form.addEventListener('submit', function(e){

  /* Prevent double submit in same page instance */
  if(formSubmitting){
    e.preventDefault();
    return;
  }

  const firstName = form.firstName.value.trim();
  const lastName = form.lastName.value.trim();
  const email = form.businessEmail.value.trim().toLowerCase();
  const phone = form.phoneNumber.value.trim();
  const carrier = form.carrier.value;
  const monthlyBudget = form.monthlyBudget.value.trim();
  const dailyVolume = form.dailyVolume.value.trim();
  const producers = form.producers.value;
  const location = form.location.value;
  const multiState = form.multiState.value;
  const startDateValue = form.startDate.value;

  /* ===== Required Field Check ===== */

  if(!firstName || !lastName || !email || !phone ||
     !carrier || !monthlyBudget || !dailyVolume ||
     !producers || !location || !multiState || !startDateValue){

    alert('Please complete all required fields.');
    e.preventDefault();
    return;
  }

  /* ===== Email Validation ===== */

  if(!isValidEmail(email) || email.endsWith('@mailinator.com')){
    alert('Please enter a valid business email address.');
    e.preventDefault();
    return;
  }

  /* ===== Phone Validation ===== */

  if(!isValidPhone(phone)){
    alert('Please enter a valid 10-digit phone number that does not start with 0 or 1.');
    e.preventDefault();
    return;
  }

  /* ===== Numeric Validation ===== */

  if(!isNumeric(monthlyBudget)){
    alert('Monthly budget must be a valid number.');
    e.preventDefault();
    return;
  }

  if(!isNumeric(dailyVolume)){
    alert('Daily volume must be a valid number.');
    e.preventDefault();
    return;
  }

  /* ===== Date Validation (No Past Dates) ===== */

  const selectedDate = new Date(startDateValue + 'T00:00:00');
  const today = new Date();
  today.setHours(0,0,0,0);

  if(selectedDate < today){
    alert('Preferred Go-Live Date cannot be in the past.');
    e.preventDefault();
    return;
  }

  /* ===== Carrier-Specific Validation ===== */

  if(carrier === 'Allstate' &&
     (!email.startsWith('a0') || !email.endsWith('@allstate.com'))){
    alert('Allstate requires an email starting with "a0" and ending with "@allstate.com".');
    e.preventDefault();
    return;
  }

  if(carrier === 'State Farm' &&
     !email.endsWith('@statefarm.com')){
    alert('State Farm requires an email ending with "@statefarm.com".');
    e.preventDefault();
    return;
  }

  if(carrier === 'Farmers Insurance' &&
     !(email.endsWith('@farmersagent.com') || email.endsWith('@farmersagency.com'))){
    alert('Farmers Insurance requires @farmersagent.com or @farmersagency.com email.');
    e.preventDefault();
    return;
  }

  /* ===== Gmail Confirmation ===== */
  if(email.endsWith('@gmail.com')){
    const userConfirmed = confirm('You have entered a Gmail address. For optimal communication and support, we recommend not using gmail. Do you want to proceed with this email?');

    if(!userConfirmed){
      e.preventDefault(); // Prevents form submission if user cancels
      return;
    }
  }

  /* ===== Lock form after all validation passes ===== */
  formSubmitting = true;

  const submitBtn = form.querySelector('button[type="submit"], input[type="submit"]');
  const loader = form.querySelector('#loader, [data-qw-loader]');

  if(submitBtn){
    submitBtn.disabled = true;

    if(submitBtn.tagName.toLowerCase() === 'button'){
      submitBtn.dataset.originalText = submitBtn.textContent;
      submitBtn.textContent = 'Submitting...';
    } else {
      submitBtn.dataset.originalText = submitBtn.value;
      submitBtn.value = 'Submitting...';
    }
  }

  if(loader){
    loader.style.display = 'block';
  }

});

})();