async function apiFetch(url, options = {}) {
  const token = localStorage.getItem('fa_token');
  const headers = { 'Content-Type': 'application/json', ...(options.headers || {}) };
  if (token) headers['Authorization'] = 'Bearer ' + token;

  const res = await fetch(url, { ...options, headers });

  if (res.status === 401) {
    localStorage.clear();
    window.location.href = '/login.html?sessao=expirada';
    return;
  }

  const data = await res.json();
  if (!res.ok) throw new Error(data.message || 'Erro desconhecido');
  return data;
}

function showToast(mensagem, tipo = 'info') {
  const existing = document.querySelector('.fa-toast');
  if (existing) existing.remove();

  const styleId = 'fa-toast-style';
  if (!document.getElementById(styleId)) {
    const style = document.createElement('style');
    style.id = styleId;
    style.textContent = `
      .fa-toast {
        position: fixed; bottom: 24px; right: 24px; z-index: 99999;
        padding: 12px 18px; border-radius: 8px; font-size: 14px;
        font-family: 'Poppins', sans-serif; max-width: 340px;
        animation: faSlideIn 0.3s ease forwards;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      }
      .fa-toast.fa-toast-sai { animation: faSlideOut 0.3s ease forwards; }
      .fa-toast-sucesso { background: #114455; color: #fff; }
      .fa-toast-erro { background: #c0392b; color: #fff; }
      .fa-toast-info { background: #f5f5f5; color: #1f2937; border: 1px solid #c0392b; }
      @keyframes faSlideIn { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
      @keyframes faSlideOut { from { transform: translateY(0); opacity: 1; } to { transform: translateY(30px); opacity: 0; } }
    `;
    document.head.appendChild(style);
  }

  const toast = document.createElement('div');
  toast.className = 'fa-toast fa-toast-' + tipo;
  toast.textContent = mensagem;
  document.body.appendChild(toast);

  setTimeout(() => {
    toast.classList.add('fa-toast-sai');
    toast.addEventListener('animationend', () => toast.remove());
  }, 3000);
}

function setButtonLoading(btn, loading, textoOriginal) {
  if (loading) {
    btn.disabled = true;
    btn.dataset.textoOriginal = textoOriginal || btn.textContent;
    btn.textContent = 'Salvando...';
  } else {
    btn.disabled = false;
    if (btn.dataset.textoOriginal) {
      btn.textContent = btn.dataset.textoOriginal;
    }
  }
}

(function() {
  window.addEventListener('offline', () => {
    let banner = document.getElementById('fa-offline-banner');
    if (!banner) {
      banner = document.createElement('div');
      banner.id = 'fa-offline-banner';
      banner.textContent = 'Sem conexao — algumas funcoes podem nao funcionar';
      banner.style.cssText = 'position:fixed;top:0;left:0;width:100%;background:#c0392b;color:#fff;text-align:center;padding:10px;font-family:Poppins,sans-serif;font-size:14px;z-index:9999;';
      document.body.prepend(banner);
    }
  });
  window.addEventListener('online', () => {
    document.getElementById('fa-offline-banner')?.remove();
  });
})();