automatic months

app.js

@@ -876,8 +876,15 @@ async function loadAvailableMonths() {
     // Load TinyColor first
     await loadTinyColor();
 
-    // Include all available months
+    // Fetch available months from server
-    const months = ['2025-01', '2025-02'];
+    const response = await fetch('/api/months');
+    const months = await response.json();
+
+    if (months.length === 0) {
+        console.error('No month data files found');
+        return;
+    }
+
     const select = document.getElementById('month-select');
     
     // Clear existing options

server.js

@@ -13,6 +13,31 @@ const MIME_TYPES = {
 };
 
 const server = http.createServer((req, res) => {
+    // API endpoint to list available months
+    if (req.url === '/api/months') {
+        fs.readdir('.', (err, files) => {
+            if (err) {
+                res.writeHead(500, { 'Content-Type': 'application/json' });
+                res.end(JSON.stringify({ error: 'Failed to read directory' }));
+                return;
+            }
+
+            // Find CSV files matching altcats-YYYY-MM.csv pattern
+            const monthPattern = /^altcats-(\d{4}-\d{2})\.csv$/;
+            const months = files
+                .map(file => {
+                    const match = file.match(monthPattern);
+                    return match ? match[1] : null;
+                })
+                .filter(Boolean)
+                .sort();
+
+            res.writeHead(200, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify(months));
+        });
+        return;
+    }
+
     // Handle URL
     let filePath = '.' + req.url;
     if (filePath === './') {