# app.py
import streamlit as st
from utils.metrics import get_login_attempts_counter
from views import show_login_page, show_dashboard, show_add_account_page, show_heir_management_page, show_security_settings_page
from models import initialize_database
from creator import Creator
import sqlite3
import os
from prometheus_client import REGISTRY
import logging
from config import init_app
import re
from typing import Tuple  # Add this import at the top
from utils.security import log_security_event 

from views import (
    show_login_page,
    show_dashboard,
    show_add_account_page,
    show_heir_management_page,
    show_security_settings_page
)

from models import initialize_database
from dashboard_components import apply_custom_css

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

CREATOR_INFO = {
    "name": "MUHAMMAD SHAHEER",
    "version": "1.0.0",
    "description": "Advanced Digital Asset Management & Inheritance"
}

if 'login_attempts_counter' not in st.session_state:
    st.session_state['login_attempts_counter'] = get_login_attempts_counter()

def initialize_app():
    """Initialize the application."""
    # Clear any existing metrics from previous sessions
    try:
        REGISTRY.unregister(REGISTRY._names_to_collectors['login_attempts_total'])
    except KeyError:
        pass

def initialize_session_state():
    """Initialize all required session state variables"""
    if 'initialized' not in st.session_state:
        try:
            # Clear any existing metrics first
            if 'login_attempts_counter' in st.session_state:
                del st.session_state['login_attempts_counter']
            
            # Initialize basic session state variables
            st.session_state.initialized = False
            st.session_state.page = 'login'
            st.session_state.user = None
            st.session_state.login_attempts = {}
            
            # Initialize database connection
            if 'db' not in st.session_state:
                st.session_state.db = sqlite3.connect('digital_heir.db', check_same_thread=False)
            
            # Initialize metrics
            from utils.metrics import get_login_attempts_counter
            st.session_state.login_attempts_counter = get_login_attempts_counter()
            
            # Initialize database tables
            initialize_database()
            
            st.session_state.initialized = True
            return True
        except Exception as e:
            logger.error(f"Initialization error: {str(e)}")
            st.error(f"Failed to initialize: {str(e)}")
            return False
    return True

def validate_inputs(data: dict) -> Tuple[bool, str]:
    """Validate user inputs"""
    if not all(data.values()):
        return False, "All fields are required"
    
    if 'email' in data and not re.match(r"[^@]+@[^@]+\.[^@]+", data['email']):
        return False, "Invalid email format"
    
    if 'username' in data and len(data['username']) < 3:
        return False, "Username must be at least 3 characters"
    
    return True, "Validation successful"

def handle_database_error(e: Exception, operation: str):
    """Handle database errors"""
    error_msg = f"Database error during {operation}: {str(e)}"
    logging.error(error_msg)
    st.error(error_msg)
    return False

def main():
    """Main application entry point"""
    # Initialize session state first
    init_success = initialize_session_state()
    
    if not init_success:
        st.error("Failed to initialize application. Please try again.")
        return
    
    # Check if user is logged in
    if 'user' not in st.session_state or st.session_state.user is None:
        show_login_page()
    else:
        # Define available pages
        pages = {
            'dashboard': show_dashboard,
            'add_account': show_add_account_page,
            'manage_heirs': show_heir_management_page,
            'security': show_security_settings_page
        }
        
        # Get current page from session state, default to dashboard
        current_page = st.session_state.get('page', 'dashboard')
        
        # Show the current page
        pages.get(current_page, show_dashboard)()

if __name__ == "__main__":
    st.set_page_config(
        page_title="Digital Inheritance System",
        page_icon="🔐",
        layout="wide"
    )
    if 'db' not in st.session_state:
        st.session_state.db = sqlite3.connect('digital_heir.db', check_same_thread=False)
    main()