// ─── Media.net Marketing Collaterals Library — Apps Script ───────
// Paste this into Extensions → Apps Script in your Google Sheet.
// Sheet must have two tabs named exactly: "Demand" and "Supply"
// Columns: A=Category  B=Item  C=Link  D=Tags (comma-separated)  E=MENU_GROUP (optional)
//
// MENU_GROUP (Column E) lets you explicitly assign any row to a
// specific menu section in the dashboard. Accepted values:
//   Verticals
//   Products & Solutions (Demand)
//   Products & Solutions (Supply)
//   Partnerships
//   Case Studies
//   Integration Guides
//   RFIs & Pitches
//   Personalized Partner Newsletters
//   Other Tags
//
// Leave column E blank to use automatic category-based routing.

function doGet(e) {
  const params = (e && e.parameter) ? e.parameter : {};
  const tab = params.tab || 'Demand';
  let payload;

  try {
    const ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(tab);
    if (!ws) {
      payload = { error: 'Tab not found: ' + tab };
    } else {
      const rows = ws.getDataRange().getValues();
      // Skip header row (row 1), skip rows with no Item value
      payload = { data: rows.slice(1).filter(r => r[1]).map(r => ({
        category:  String(r[0] || '').trim(),
        item:      String(r[1] || '').trim(),
        link:      String(r[2] || '').trim(),
        tags:      r[3] ? String(r[3]).split(',').map(t => t.trim()).filter(Boolean) : [],
        menuGroup: r[4] ? String(r[4]).trim() : ''   // optional explicit menu section
      })) };
    }
  } catch (err) {
    payload = { error: String(err) };
  }

  return reply(payload, params.callback);
}

// Add + delete from the dashboard. The page posts form-encoded with
// mode:'no-cors' and never reads the reply, so failures here are invisible
// to it — check Executions in the Apps Script editor when debugging.
function doPost(e) {
  const p = (e && e.parameter) ? e.parameter : {};
  const lock = LockService.getScriptLock();
  lock.waitLock(20000);
  try {
    const ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(p.tab || 'Demand');
    if (!ws) return reply({ ok: false, error: 'Tab not found: ' + p.tab });

    if (p.action === 'add') {
      ws.appendRow([p.category || '', p.item || '', p.link || '', p.tags || '', p.menuGroup || '']);
    } else if (p.action === 'delete') {
      const rows = ws.getDataRange().getValues();
      for (let i = rows.length - 1; i >= 1; i--) {
        if (String(rows[i][1]).trim() === String(p.item).trim()) { ws.deleteRow(i + 1); break; }
      }
    }
    return reply({ ok: true });
  } catch (err) {
    return reply({ ok: false, error: String(err) });
  } finally {
    lock.releaseLock();
  }
}

// Returns JSONP when a ?callback= is present, plain JSON otherwise.
// The dashboard reads via JSONP because Apps Script cannot set CORS headers,
// so a normal fetch() breaks the moment the /exec redirect returns anything
// other than clean JSON.
function reply(obj, callback) {
  const json = JSON.stringify(obj);
  if (callback) {
    return ContentService
      .createTextOutput(callback + '(' + json + ');')
      .setMimeType(ContentService.MimeType.JAVASCRIPT);
  }
  return ContentService
    .createTextOutput(json)
    .setMimeType(ContentService.MimeType.JSON);
}