// Enhanced form protection for ClientSurgeAI contact form
let formStartTime = null;
let submitButton = null;
let formElement = null;

function init() {
  // Record when the form loads
  formStartTime = Date.now();
  formElement = document.querySelector('[data-landingsite-contact-form]');
  submitButton = formElement?.querySelector('button[type="submit"]');
  
  if (formElement) {
    // Set the hidden start time field
    const startTimeField = document.getElementById('form_start_time');
    if (startTimeField) {
      startTimeField.value = formStartTime.toString();
    }
    
    // Add form submit protection
    formElement.addEventListener('submit', handleFormSubmit);
    
    // Add real-time validation
    addInputValidation();
  }
}

function handleFormSubmit(event) {
  const currentTime = Date.now();
  const timeSpent = (currentTime - formStartTime) / 1000; // seconds
  
  // Prevent submission if completed too quickly (likely a bot)
  if (timeSpent < 10) {
    event.preventDefault();
    showError('Please take a moment to review your information before submitting.');
    return false;
  }
  
  // Check honeypot field
  const honeypot = formElement.querySelector('input[name="website"]');
  if (honeypot && honeypot.value) {
    event.preventDefault();
    return false; // Silent fail for bots
  }
  
  // Validate required fields have meaningful content
  if (!validateFormContent()) {
    event.preventDefault();
    return false;
  }
  
  // Disable submit button to prevent double submission
  if (submitButton) {
    submitButton.disabled = true;
    submitButton.innerHTML = '<i class="fas fa-spinner fa-spin mr-2"></i>Submitting...';
  }
  
  return true;
}

function validateFormContent() {
  const firstName = document.getElementById('firstName').value.trim();
  const lastName = document.getElementById('lastName').value.trim();
  const email = document.getElementById('email').value.trim();
  const company = document.getElementById('company').value.trim();
  const message = document.getElementById('message').value.trim();
  
  // Check for obvious fake content
  const suspiciousPatterns = [
    /test/i,
    /fake/i,
    /spam/i,
    /^[a-z]+$/,  // all lowercase single word
    /^[A-Z]+$/,  // all uppercase single word
    /^\d+$/,     // only numbers
  ];
  
  const fieldsToCheck = [firstName, lastName, company];
  
  for (const field of fieldsToCheck) {
    for (const pattern of suspiciousPatterns) {
      if (pattern.test(field)) {
        showError('Please provide legitimate business information.');
        return false;
      }
    }
  }
  
  // Validate email domain
  if (!isValidBusinessEmail(email)) {
    showError('Please use a business email address.');
    return false;
  }
  
  // Check message quality
  if (message.length < 20 || /^[a-zA-Z\s]+$/.test(message) && message.split(' ').length < 5) {
    showError('Please provide more details about your business needs.');
    return false;
  }
  
  return true;
}

function isValidBusinessEmail(email) {
  // Block common temporary/disposable email domains
  const blockedDomains = [
    'gmail.com',  // Consider removing if you want to allow Gmail
    '10minutemail.com',
    'tempmail.org',
    'guerrillamail.com',
    'mailinator.com',
    'temp-mail.org'
  ];
  
  const domain = email.split('@')[1]?.toLowerCase();
  
  // For now, let's allow Gmail but flag other suspicious domains
  const suspiciousDomains = [
    '10minutemail.com',
    'tempmail.org', 
    'guerrillamail.com',
    'mailinator.com',
    'temp-mail.org',
    'throwaway.email'
  ];
  
  return !suspiciousDomains.includes(domain);
}

function addInputValidation() {
  // Real-time validation for name fields
  const nameFields = ['firstName', 'lastName'];
  nameFields.forEach(fieldId => {
    const field = document.getElementById(fieldId);
    if (field) {
      field.addEventListener('input', function() {
        // Remove numbers and special characters
        this.value = this.value.replace(/[^A-Za-z\s]/g, '');
        
        // Limit consecutive spaces
        this.value = this.value.replace(/\s+/g, ' ');
      });
    }
  });
  
  // Email validation
  const emailField = document.getElementById('email');
  if (emailField) {
    emailField.addEventListener('blur', function() {
      if (this.value && !isValidBusinessEmail(this.value)) {
        this.setCustomValidity('Please use a business email address');
      } else {
        this.setCustomValidity('');
      }
    });
  }
  
  // Message field validation
  const messageField = document.getElementById('message');
  if (messageField) {
    messageField.addEventListener('input', function() {
      const remaining = 1000 - this.value.length;
      const label = document.querySelector('label[for="message"]');
      if (label && remaining < 100) {
        label.textContent = `Tell us about your business and goals * (${remaining} characters remaining)`;
      }
    });
  }
}

function showError(message) {
  // Remove existing error message
  const existingError = document.getElementById('form-error-message');
  if (existingError) {
    existingError.remove();
  }
  
  // Create error message
  const errorDiv = document.createElement('div');
  errorDiv.id = 'form-error-message';
  errorDiv.className = 'bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg mb-4';
  errorDiv.innerHTML = `<i class="fas fa-exclamation-triangle mr-2"></i>${message}`;
  
  // Insert before form
  if (formElement) {
    formElement.parentNode.insertBefore(errorDiv, formElement);
    
    // Scroll to error
    errorDiv.scrollIntoView({ behavior: 'smooth', block: 'center' });
    
    // Remove error after 5 seconds
    setTimeout(() => {
      if (errorDiv.parentNode) {
        errorDiv.remove();
      }
    }, 5000);
  }
}

function teardown() {
  if (formElement) {
    formElement.removeEventListener('submit', handleFormSubmit);
  }
}

// Export the required functions
export { init, teardown };