export function buildEmail(data) {
  const name=String(data.name||'').trim(), email=String(data.email||'').trim(), message=String(data.message||'').trim();
  if (!name || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email) || !message) throw new Error('Please enter your name, a valid email and your project requirements.');
  const service=String(data.service||'General enquiry').replace(/[\r\n]/g,' ');
  const body=`Name: ${name}\nEmail: ${email}\nCompany: ${data.company||'Not specified'}\nService: ${service}\n\nProject requirements:\n${message}`;
  return `mailto:info@sgnuvetrix.com?subject=${encodeURIComponent('NUVETRIX enquiry: '+service)}&body=${encodeURIComponent(body)}`;
}

if (typeof document!=='undefined') {
 const menu=document.querySelector('.menu-toggle'), nav=document.querySelector('#site-nav');
 menu?.addEventListener('click',()=>{const open=menu.getAttribute('aria-expanded')!=='true';menu.setAttribute('aria-expanded',String(open));nav.classList.toggle('is-open',open);});
 document.addEventListener('keydown',e=>{if(e.key==='Escape'&&menu){menu.setAttribute('aria-expanded','false');nav.classList.remove('is-open');menu.focus();}});
 const form=document.querySelector('#enquiry-form');
 if(form){
  const service=new URLSearchParams(location.search).get('service');
  if(service && [...form.elements.service.options].some(o=>o.value===service)) form.elements.service.value=service;
  const panel=document.querySelector('#draft-result');
  form.addEventListener('input',()=>{panel.hidden=true;});
  form.addEventListener('submit',e=>{
   e.preventDefault();
   if(!form.reportValidity())return;
   try{const href=buildEmail(Object.fromEntries(new FormData(form)));document.querySelector('#open-draft').href=href;panel.hidden=false;panel.focus();}
   catch(error){document.querySelector('#form-status').textContent=error.message;}
  });
 }
}