app.py

import streamlit as st
import json


st.set_page_config(layout="wide")
m = st.markdown(
    """
<style>
div.stButton > button:first-child {
    background-color: #006400;
    color:#ffffff;
}
</style>""",
    unsafe_allow_html=True,
)

# Load JSON data from file
with open("sentinel_datasets.json") as f:
    data = json.load(f)

# Display title
st.title("Sentinel Dataset Selector")

# Step 1: Select main dataset category
main_selection = st.selectbox("Select Sentinel Dataset Category", list(data.keys()))

# Step 2: Display sub-options based on main selection
if main_selection:
    sub_options = data[main_selection]["sub_options"]
    sub_selection = st.selectbox("Select Specific Dataset ID", list(sub_options.keys()))

    # Step 3: Display band selection based on sub-selection with max 3 selections
    if sub_selection:
        bands = sub_options[sub_selection]
        st.write("Select up to 3 bands:")
        
        # Create a list to store selected bands
        selected_bands = []
        
        # Display checkboxes for each band with a maximum selection limit of 3
        for band in bands:
            if st.checkbox(band, key=band):
                selected_bands.append(band)
            # Limit selection to a maximum of 3 bands
            if len(selected_bands) == 3:
                break
        
        # Show a warning if more than 3 bands are selected
        if len(selected_bands) > 3:
            st.warning("You can select a maximum of 3 bands.")
        
        # Display selected bands
        st.write("Selected Bands:", selected_bands)