From dbbf62b793a4fe6c7d2511e6c5b887234fe64e9c Mon Sep 17 00:00:00 2001
From: Julian Freeman <freemanjulian372@gmail.com>
Date: Wed, 11 Mar 2026 13:01:18 -0400
Subject: [PATCH] support custom sheet and create headers

---
 google-script.js | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/google-script.js b/google-script.js
index 38b606a..7f2ef39 100644
--- a/google-script.js
+++ b/google-script.js
@@ -24,21 +24,32 @@ function doPost(e) {
       sheet = ss.getActiveSheet();
     }
     
-    // 2. Get headers
-    var lastCol = sheet.getLastColumn();
     var headers = [];
-    if (lastCol > 0) {
-      headers = sheet.getRange(1, 1, 1, lastCol).getValues()[0];
-    }
-
-    // 3. If sheet is empty, set headers from JSON keys
-    if (headers.length === 0 || headers[0] === "") {
-      headers = Object.keys(data);
+    
+    // 2. If sheet is brand new (no rows), create headers first
+    if (sheet.getLastRow() === 0) {
+      // Extract keys from data, excluding 'sheetName' which is a control parameter
+      headers = Object.keys(data).filter(function(key) {
+        return key !== "sheetName";
+      });
       sheet.appendRow(headers);
+    } else {
+      // 3. If sheet already exists, get existing headers from the first row
+      var lastCol = sheet.getLastColumn();
+      if (lastCol > 0) {
+        headers = sheet.getRange(1, 1, 1, lastCol).getValues()[0];
+      } else {
+        // Fallback for edge cases where lastRow > 0 but lastCol is 0
+        headers = Object.keys(data).filter(function(key) {
+          return key !== "sheetName";
+        });
+        sheet.appendRow(headers);
+      }
     }
     
-    // 4. Map data to headers
+    // 4. Map data to the determined headers
     var row = headers.map(function(header) {
+      // data[header] might be undefined for some rows if schema changes
       return data[header] !== undefined ? data[header] : "N/A";
     });