Update app.py

app.py

@@ -166,41 +166,35 @@ def fetch_solunar_tide_data(lat, lon, datetime_input):
         st.error(f"Error fetching Solunar and Tide data: {e}")  
         return None
 
-
-
 def save_openweather_historical_to_csv(openweather_historical_readings):  
-    """Save historical OpenWeather data to CSV."""  
+    """Save historical OpenWeather data to CSV for download."""  
     try:  
         # Validate input data  
         if not openweather_historical_readings:  
             raise ValueError("No historical data available.")  
         
         # Create a DataFrame from the readings  
-        df = pd.DataFrame(openweather_historical_readings)  
+        df = pd.DataFrame([openweather_historical_readings])  # Assuming a single row of data  
         
         # Ensure the DataFrame is not empty  
         if df.empty:  
             raise ValueError("DataFrame is empty.")  
         
-        # Create a timestamped file name  
-        file_name = f"openweather_historical_data_{datetime.now().strftime('%Y%m%d_%H%M%S')}.csv"  
-        
-        # Define a safe file path to save the CSV  
-        file_path = os.path.join("data", file_name)  
-        os.makedirs(os.path.dirname(file_path), exist_ok=True)  
-        
-        # Save the DataFrame to a CSV file  
-        df.to_csv(file_path, index=False)  
+        # Create a CSV buffer in memory  
+        csv_buffer = io.StringIO()  
+        df.to_csv(csv_buffer, index=False)  
         
-        print(f"Successfully saved historical data to {file_path}")  
-        return file_path  # Return the file path for verification  
+        # Return the CSV data as a string  
+        csv_data = csv_buffer.getvalue()  
+        return csv_data  
     
     except ValueError as ve:  
         print(f"Validation error: {ve}")  
         return None  
     except Exception as e:  
         print(f"Error saving historical data: {str(e)}")  
-        return None   
+        return None  
+  
 
 def save_stormglass_marine_to_csv():  
     """Save Stormglass marine data to CSV."""  
@@ -306,27 +300,22 @@ def main():
         
         # Download button for historical data  
         if st.button("Download Historical Weather Data"):  
-            file_path = save_openweather_historical_to_csv(openweather_historical_readings)  
+            csv_data = save_openweather_historical_to_csv(openweather_historical_readings)  
     
-            if file_path:  
+            if csv_data:  
                 try:  
-                    # Read the saved CSV file  
-                    with open(file_path, 'rb') as file:  
-                        csv_data = file.read()  
-            
-                    # Create a download button  
+            # Create a download button  
                     st.download_button(  
                         label="Download Historical Weather Data CSV",  
                         data=csv_data,  
-                        file_name=os.path.basename(file_path),  
+                        file_name=f"openweather_historical_data_{datetime.datetime.now().strftime('%Y%m%d_%H%M%S')}.csv",  
                         mime="text/csv",  
                     )  
                     st.success("Historical weather data saved and ready for download!")  
-            
                 except Exception as e:  
                     st.error(f"Error preparing download: {str(e)}")  
             else:  
-                st.error("No historical weather data available.")  
+                st.error("No historical weather data available.")