/* ── Tax Tables ── */
const TABLES = {
  1: [
    {max:180000, aliq:.04, ded:0},
    {max:360000, aliq:.073, ded:5940},
    {max:720000, aliq:.095, ded:13860},
    {max:1800000, aliq:.107, ded:22500},
    {max:3600000, aliq:.143, ded:87300},
    {max:4800000, aliq:.19, ded:378000}
  ],
  2: [
    {max:180000, aliq:.045, ded:0},
    {max:360000, aliq:.078, ded:5940},
    {max:720000, aliq:.10, ded:13860},
    {max:1800000, aliq:.112, ded:22500},
    {max:3600000, aliq:.147, ded:85500},
    {max:4800000, aliq:.30, ded:720000}
  ],
  3: [
    {max:180000, aliq:.06, ded:0},
    {max:360000, aliq:.112, ded:9360},
    {max:720000, aliq:.135, ded:17640},
    {max:1800000, aliq:.16, ded:35640},
    {max:3600000, aliq:.21, ded:125640},
    {max:4800000, aliq:.33, ded:648000}
  ],
  4: [
    {max:180000, aliq:.045, ded:0},
    {max:360000, aliq:.09, ded:8100},
    {max:720000, aliq:.102, ded:12420},
    {max:1800000, aliq:.14, ded:39780},
    {max:3600000, aliq:.22, ded:183780},
    {max:4800000, aliq:.33, ded:828000}
  ],
  5: [
    {max:180000, aliq:.155, ded:0},
    {max:360000, aliq:.18, ded:4500},
    {max:720000, aliq:.195, ded:9900},
    {max:1800000, aliq:.205, ded:17100},
    {max:3600000, aliq:.23, ded:62100},
    {max:4800000, aliq:.305, ded:540000}
  ]
};

/* ── Tab Switching ── */
function switchTab(n) {
  document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
  document.querySelectorAll('.tab-panel').forEach(p => p.classList.remove('active'));
  document.querySelector(`.tab-btn[data-tab="${n}"]`).classList.add('active');
  document.getElementById(`panel-${n}`).classList.add('active');
}

/* ── Accordion ── */
function toggleAccordion(trigger) {
  const body = trigger.nextElementSibling;
  const isOpen = trigger.classList.contains('open');

  // Close all
  document.querySelectorAll('.accordion-trigger').forEach(t => {
    t.classList.remove('open');
    t.nextElementSibling.style.maxHeight = null;
  });

  if (!isOpen) {
    trigger.classList.add('open');
    body.style.maxHeight = body.scrollHeight + 'px';
  }
}

/* ── Currency Formatting ── */
function parseVal(s) {
  if (!s) return 0;
  return parseFloat(s.replace(/\./g, '').replace(',', '.')) || 0;
}

function fmtBRL(v) {
  return v.toLocaleString('pt-BR', {minimumFractionDigits: 2, maximumFractionDigits: 2});
}

function rawCalcInput(el) {
  const v = parseVal(el.value);
  if (v > 0) el.value = v.toString().replace('.', ',');
}

function fmtCalcInput(el) {
  el.value = el.value.replace(/[^\d,]/g, '');
}

function fmtCalcBlur(el) {
  const v = parseVal(el.value);
  if (v > 0) el.value = fmtBRL(v);
  else el.value = '';
}

/* ── Calculate Effective Rate ── */
function calcEfetiva(anexo) {
  const input = document.getElementById(`calc-rbt-${anexo}`);
  const rbt = parseVal(input.value);
  const resultDiv = document.getElementById(`calc-result-${anexo}`);

  if (rbt <= 0 || rbt > 4800000) {
    resultDiv.classList.remove('show');
    return;
  }

  const table = TABLES[anexo];
  let faixa = null;
  let faixaNum = 0;

  for (let i = 0; i < table.length; i++) {
    if (rbt <= table[i].max) {
      faixa = table[i];
      faixaNum = i + 1;
      break;
    }
  }

  if (!faixa) return;

  const ae = (rbt * faixa.aliq - faixa.ded) / rbt;
  const dasMensal = (rbt / 12) * ae;

  document.getElementById(`res-faixa-${anexo}`).textContent = `${faixaNum}ª Faixa`;
  document.getElementById(`res-nominal-${anexo}`).textContent = (faixa.aliq * 100).toFixed(2).replace('.', ',') + '%';
  document.getElementById(`res-deduzir-${anexo}`).textContent = 'R$ ' + fmtBRL(faixa.ded);
  document.getElementById(`res-efetiva-${anexo}`).textContent = (ae * 100).toFixed(2).replace('.', ',') + '%';
  document.getElementById(`res-das-${anexo}`).textContent = 'R$ ' + fmtBRL(dasMensal);

  resultDiv.classList.add('show');
}

/* ── Enter key triggers calc ── */
document.querySelectorAll('[id^="calc-rbt-"]').forEach(input => {
  input.addEventListener('keydown', e => {
    if (e.key === 'Enter') {
      const anexo = input.id.split('-').pop();
      calcEfetiva(parseInt(anexo));
    }
  });
});