update index histogram to csv

app.py

@@ -898,14 +898,27 @@ def compute_index_histogram(file_url: str, index_name: str, start_date: str, end
     histogram, _ = get_histogram(index_name, mosaic.select(index_name), ee_geometry, bins)
 
     total = histogram.sum()
-    result = {f'mean': mean_val}
+    
+    # result = {f'mean': mean_val}
+    # for i in range(len(bins) - 1):
+    #     label = f"{bins[i]}-{bins[i+1]}"
+    #     pct = (histogram[i] / total * 100) if total > 0 else 0
+    #     result[label] = round(pct, 2)
+
+
+    output_parts = [f'mean, {round(mean_val, 4)}']
+
     for i in range(len(bins) - 1):
         label = f"{bins[i]}-{bins[i+1]}"
         pct = (histogram[i] / total * 100) if total > 0 else 0
-        result[label] = round(pct, 2)
+        # Append each key-value pair string to the list
+        output_parts.append(f'{label}, {round(pct, 2)}')
 
-    return result
+    # Join all parts into a single comma-separated string
+    final_string = ", ".join(output_parts)
 
+    # Return the string as a plain text response
+    return Response(content=final_string, media_type="text/plain")
 
 # Register endpoints for multiple indices with date range
 for idx in ["NDVI", "EVI", "EVI2", "RandomForest", "CI", "GujVDI"]: