import os
import sys
import streamlit as st
from dotenv import load_dotenv

load_dotenv()
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from modules.home import main as semantic_filter_main
from modules.cluster_page import main as cluster_main


def load_credentials() -> dict:
    users = {}
    for i in range(1, 4):
        entry = os.getenv(f"LOGIN_USER{i}", "")
        if ":" in entry:
            username, password = entry.split(":", 1)
            users[username] = password
    return users


def show_login() -> None:
    st.title("🔒 Accesso")
    with st.form("login_form"):
        username = st.text_input("Username")
        password = st.text_input("Password", type="password")
        submitted = st.form_submit_button("Accedi")
    if submitted:
        credentials = load_credentials()
        if username in credentials and credentials[username] == password:
            st.session_state.authenticated = True
            st.session_state.username = username
            st.rerun()
        else:
            st.error("Credenziali non valide. Riprova.")


def main() -> None:
    st.sidebar.title("🏛️ PNRR Data Processor")
    st.sidebar.markdown("---")

    page = st.sidebar.radio(
        "Seleziona una funzione:",
        ["🔍 Filtro Semantico", "🎯 Analisi Cluster"],
        format_func=lambda x: x
    )

    st.sidebar.markdown("---")
    st.sidebar.markdown("""
    ### ℹ️ Informazioni

    **Filtro Semantico**: Filtra i progetti PNRR basandosi su query testuali usando ricerca semantica.

    **Analisi Cluster**: Raggruppa automaticamente i progetti in cluster tematici per identificare pattern ricorrenti.
    """)

    if st.sidebar.button("🚪 Logout"):
        st.session_state.authenticated = False
        st.rerun()

    if page == "🔍 Filtro Semantico":
        semantic_filter_main()
    elif page == "🎯 Analisi Cluster":
        cluster_main()


if __name__ == "__main__":
    st.set_page_config(
        page_title="PNRR Data Processor",
        page_icon="🏛️",
        layout="wide",
        initial_sidebar_state="expanded"
    )
    if not st.session_state.get("authenticated", False):
        show_login()
    else:
        main()