import streamlit as st

from functions_ui import search_cas_number

# Configure page
st.set_page_config(
    page_title="LMB App",
    page_icon="🔬",
    layout="wide"
)

# Password protection
def check_password():
    """Returns `True` if the user had the correct password."""

    def password_entered():
        """Checks whether a password entered by the user is correct."""
        if st.session_state["password"] == st.secrets["passwords"]["app_password"]:
            st.session_state["password_correct"] = True
            del st.session_state["password"]  # Don't store password
        else:
            st.session_state["password_correct"] = False

    # First run, show input for password
    if "password_correct" not in st.session_state:
        st.text_input(
            "Password", type="password", on_change=password_entered, key="password"
        )
        return False
    # Password not correct, show input + error
    elif not st.session_state["password_correct"]:
        st.text_input(
            "Password", type="password", on_change=password_entered, key="password"
        )
        st.error("😕 Password incorrect")
        return False
    # Password correct
    else:
        return True

if not check_password():
    st.stop()

# Define home page function
def home():
    st.title("LMB App: PIF & Toxicological Data Viewer")

    # Inizializza session_state per il CAS number se non esiste
    if 'selected_cas' not in st.session_state:
        st.session_state.selected_cas = None

    input = st.text_input("Enter CAS Number:", "")
    if input:
        st.caption(f"Ricerca per {input}: trovati i seguenti ingredienti.")
        results = search_cas_number(input)

        if results:
            # Crea le stringhe per la selectbox: "CAS - INCI"
            display_options = [f"{cas} - {inci}" for cas, inci in results]

            # Selectbox con i risultati formattati
            selected_display = st.selectbox("Results", options=[""] + display_options, key="cas_selectbox")

            # Salva solo il CAS selezionato nel session_state (estrae la parte prima del " - ")
            if selected_display and selected_display != "":
                selected_cas = selected_display.split(" - ")[0]
                st.session_state.selected_cas = selected_cas
                st.success(f"CAS Number selezionato: {selected_cas}")
        else:
            # Nessun risultato trovato: permetti di usare l'input manuale
            st.warning("Nessun risultato trovato nel database.")
            if st.button("Usa questo CAS Number"):
                st.session_state.selected_cas = input
                st.success(f"CAS Number salvato: {input}")

    # Mostra il CAS attualmente selezionato
    if st.session_state.selected_cas:
        st.info(f"CAS Number corrente: {st.session_state.selected_cas}")

# Navigation
home_page = st.Page(home, title="Home", icon="🏠", default=True)
echa_page = st.Page("pages/echa.py", title="ECHA Database", icon="🧪")
cosing_page = st.Page("pages/cosing.py", title="CosIng", icon="💄")
#pubchem_page = st.Page("pages/pubchem.py", title="PubChem", icon="🧬")
#cir_page = st.Page("pages/cir.py", title="CIR", icon="📊")


pg = st.navigation({
    "Ricerca": [home_page],
    "Database": [echa_page, cosing_page]
})

pg.run()