// ═══════════════════════════════════════════════════════
// JSON ↔ CSV Converter
// ═══════════════════════════════════════════════════════
let lastJsoncsvType = 'csv'; // track last conversion type for download

async function jsonToCsv() {
  const input = document.getElementById('jsoncsvJsonInput').value.trim();
  if (!input) return setStatus('jsoncsvStatus', 'error', 'Paste some JSON first.');
  const d = await apiPost('/api/convert/json-to-csv', { json: input });
  if (d.success) {
    document.getElementById('jsoncsvOutput').value = d.result;
    lastJsoncsvType = 'csv';
    setStatus('jsoncsvStatus', 'success', `Converted ✓ — ${d.rows} rows, ${d.columns} columns`);
  } else setStatus('jsoncsvStatus', 'error', d.error);
}

async function csvToJson() {
  const input = document.getElementById('jsoncsvCsvInput').value.trim();
  if (!input) return setStatus('jsoncsvStatus', 'error', 'Paste some CSV first.');
  const d = await apiPost('/api/convert/csv-to-json', { csv: input });
  if (d.success) {
    document.getElementById('jsoncsvOutput').value = JSON.stringify(d.result, null, 2);
    lastJsoncsvType = 'json';
    setStatus('jsoncsvStatus', 'success', `Converted ✓ — ${d.result.length} records`);
  } else setStatus('jsoncsvStatus', 'error', d.error);
}

function downloadJsoncsvOutput() {
  const output = document.getElementById('jsoncsvOutput').value;
  if (!output) return setStatus('jsoncsvStatus', 'error', 'Nothing to download.');
  const ext = lastJsoncsvType === 'csv' ? 'csv' : 'json';
  const mime = lastJsoncsvType === 'csv' ? 'text/csv' : 'application/json';
  const blob = new Blob([output], { type: mime });
  const a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = `converted.${ext}`;
  a.click();
  URL.revokeObjectURL(a.href);
  setStatus('jsoncsvStatus', 'success', 'Downloaded ✓');
}