streamlit_app.py

# Minimal Streamlit + Folium app for selecting a point on a map and calling core.get_location_properties
# Usage:
# 1) python -m venv venv; source venv/bin/activate
# 2) pip install -r requirements.txt
# 3) streamlit run streamlit_app.py

import streamlit as st
from streamlit_folium import st_folium
import folium
from core import get_location_properties

st.set_page_config(page_title="LocationWizard — OsdagBridge Starter", layout="wide")
st.title("LocationWizard — OsdagBridge (Starter)")

st.markdown(
    """
    **Purpose:** click a point on the map (India) and the app will query **local** Survey-of-India shapefiles
    to return seismic & basic wind information for that location.

    **IMPORTANT:** The app expects SoI shapefiles placed under `data/`:
    - data/soi_seismic_zones.shp (+ .shx, .dbf, ...)
    - data/soi_wind_regions.shp (+ .shx, .dbf, ...)
    """
)

col1, col2 = st.columns([2, 1])

with col1:
    # Center map on India
    m = folium.Map(location=[22.0, 78.0], zoom_start=5, tiles="OpenStreetMap")
    folium.LatLngPopup().add_to(m)
    st.write("Click anywhere on the map. Selected coordinates will appear and be queried.")
    map_data = st_folium(m, height=650)

with col2:
    st.header("Selected location / results")
    if map_data and map_data.get("last_clicked"):
        lat = map_data["last_clicked"]["lat"]
        lon = map_data["last_clicked"]["lng"]
        st.write(f"**Coordinates:** {lat:.6f}, {lon:.6f}")
        try:
            props = get_location_properties(lat, lon)
            st.json(props)
        except FileNotFoundError as e:
            st.error(str(e))
        except Exception as e:
            st.error(f"Lookup error: {e}")
    else:
        st.info("Click on the map to select a point.")