"""Authentication handling for the application"""
import streamlit as st
from typing import Optional, Dict

def check_authentication() -> bool:
    """Check if user is authenticated"""
    if 'user' not in st.session_state:
        show_login()
        return False
    return True

def show_login() -> None:
    """Display login form"""
    st.title("🔐 Login")
    
    with st.form("login_form"):
        # Default to test@example.com for easy testing
        email = st.text_input("Email", value="test@example.com")
        submitted = st.form_submit_button("Login")
        
        if submitted:
            authenticate_user(email)

def authenticate_user(email: str) -> None:
    """Authenticate user and set up session"""
    db_service = st.session_state.services['db']
    
    user = db_service.get_user_by_email(email)
    if user:
        st.session_state.user = user
        # Get user's accounts immediately after login
        accounts = db_service.get_user_accounts(user['id'])
        st.session_state.user_accounts = accounts
        st.success(f"Welcome back, {user['name']}!")
        st.rerun()
    else:
        st.error("Invalid email. Please try again.")