fix buttom button

app.py

@@ -74,6 +74,16 @@ with st.expander("Advanced Controls", expanded=False):
 
 geometry_gdf = input_gdf[input_gdf.index == input_geometry_idx]
 
+
+def check_valid_geometry(geometry_gdf):
+    geometry = geometry_gdf.geometry.item()
+    if geometry.type != "Polygon":
+        st.error(f"Selected geometry is of type '{geometry.type}'. Please provide a 'Polygon' geometry.")
+        st.stop()
+
+
+check_valid_geometry(geometry_gdf)
+
 m = leafmap.Map()
 
 st.markdown(
@@ -165,13 +175,45 @@ print(type(stats_df["Points"].item()))
 csv = stats_df.T.to_csv(index=True)
 st.download_button("Download Geometry Metrics", csv, f"{file_url}_metrics.csv", "text/csv", use_container_width=True)
 
-# Add HTML button to open in Google Earth
-st.markdown(
-    f"""
-<div style="display: flex; justify-content: center;">
-    <a href="https://huggingface.co/spaces/SustainabilityLabIITGN/NDVI_PERG?file_url={file_url}" target="_blank">
-        <button>Click for NDVI Timeseries</button>
-    </a>
-""",
-    unsafe_allow_html=True,
-)
+
+if isinstance(file_url, str):
+    st.markdown(
+        f"""
+        <div style="display: flex; justify-content: center;">
+            <a href="https://huggingface.co/spaces/SustainabilityLabIITGN/NDVI_PERG?file_url={file_url}" target="_blank">
+                <button style="
+                    background-color: #006400; /* Green background */
+                    color: white; /* White text */
+                    padding: 10px 20px;
+                    font-size: 16px;
+                    border: none;
+                    border-radius: 5px;
+                    cursor: pointer;
+                ">
+                    Click for NDVI Timeseries
+                </button>
+            </a>
+        </div>
+        """,
+        unsafe_allow_html=True,
+    )
+else:
+    st.markdown(
+        f"""
+        <div style="display: flex; justify-content: center;">
+                <button style="
+                    background-color: #FF0000; /* Green background */
+                    color: white; /* White text */
+                    padding: 10px 20px;
+                    font-size: 16px;
+                    border: none;
+                    border-radius: 5px;
+                    cursor: pointer;
+                ">
+                    Click for NDVI Timeseries (This button will be enabled when you provide a file via `?file_url=`)
+                </button>
+            </a>
+        </div>
+        """,
+        unsafe_allow_html=True,
+    )