/* Browser-local cart recovery. Files are stored only for an unfinished cart, for 24h.
   Only the items are kept: the customer's details and address are typed again
   after a reload or a closed tab, so nothing personal stays in the browser. */
(() => {
  // A browser may put back what was typed before the reload without telling
  // the page, which then shows values it does not know and cannot pay with.
  const CAMPOS=['fCnpj','fZap','fMail','cepIn','eNome','eRua','eNum','eComp','eBairro','eCidade','eUf'];
  for(const id of CAMPOS)if($(id))$(id).value='';
  let database,scope,timer,restoring=true;
  let signedOut=false;
  window.addEventListener('dtf-private-data-cleared',()=>{signedOut=true;clearTimeout(timer);pedido=[];itemAtual=null;folhas=[];artes=[];});
  const notice=document.createElement('p');notice.className='carrAviso';
  document.getElementById('carr').prepend(notice);
  function transaction(mode,fn){return new Promise((resolve,reject)=>{const tx=database.transaction('cart',mode);const request=fn(tx.objectStore('cart'));let result;request.onsuccess=()=>result=request.result;tx.oncomplete=()=>resolve(result);tx.onerror=()=>reject(tx.error);tx.onabort=()=>reject(tx.error);});}
  async function save(){
    if(signedOut||restoring||!database||!scope)return;
    const items=[...pedido,...(itemAtual?[itemAtual]:[])];
    try{
      if(!items.length){await transaction('readwrite',store=>store.delete(scope));return;}
      await transaction('readwrite',store=>store.put({items,expires:Date.now()+86400000},scope));
      notice.textContent='Carrinho salvo neste navegador por 24 horas. Você pode remover itens e adicionar outros após recarregar.';
    }catch(error){notice.textContent='Não foi possível salvar o carrinho neste navegador. Mantenha esta página aberta até enviar o pedido.';}
  }
  window.dtfClearCart=async()=>{clearTimeout(timer);if(database&&scope)await transaction('readwrite',store=>store.delete(scope));notice.textContent='';};
  window.addEventListener('dtf-cart-changed',()=>{clearTimeout(timer);timer=setTimeout(save,400);});
  window.addEventListener('pagehide',()=>{clearTimeout(timer);save();});
  setInterval(async()=>{
    if(!database||signedOut)return;
    try{const keys=await transaction('readonly',s=>s.getAllKeys());for(const key of keys){const value=await transaction('readonly',s=>s.get(key));if(value&&value.expires<Date.now())await transaction('readwrite',s=>s.delete(key));}}catch{/* Browser may close storage during navigation. */}
  },60000);
  (async()=>{
    try{
      scope=(await window.dtfSessionReady).cart_scope;
      database=await new Promise((resolve,reject)=>{const req=indexedDB.open('dtf-local-cart',1);req.onupgradeneeded=()=>req.result.createObjectStore('cart');req.onsuccess=()=>resolve(req.result);req.onerror=()=>reject(req.error);});
      const records=await transaction('readonly',store=>store.getAllKeys());
      for(const key of records){const value=await transaction('readonly',store=>store.get(key));if(value.expires<Date.now())await transaction('readwrite',store=>store.delete(key));}
      const saved=await transaction('readonly',store=>store.get(scope));
      if(saved && !pedido.length && !itemAtual){
        pedido=saved.items;
        $('atual').style.display='none';pintaEntrega();
        notice.textContent='Carrinho recuperado. Remova e adicione novamente um item se precisar alterar sua montagem.';
      }else{
        const account=await window.dtfApi('/account/me');
        if(account.customer && !cliente.mail){cliente={...account.customer};for(const [id,key] of [['fCnpj','cnpj'],['fZap','zap'],['fMail','mail']])$(id).value=cliente[key];pintaEntrega();}
      }
    }catch(error){notice.textContent='Recuperação de carrinho indisponível; o pedido ainda pode ser feito nesta sessão.';}
    finally{restoring=false;}
  })();
})();