app.py

"""
Main Streamlit Application
"""
import streamlit as st
import sys
import os
from datetime import datetime
import logging

# Add the current directory to Python path
current_dir = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, current_dir)

print(f"===== Application Startup at {datetime.now().strftime('%Y-%m-%d %H:%M:%S')} =====")

try:
    from pages.dashboard import create_dashboard_page
    from utils.error_handling import handle_data_exceptions, log_error, display_error
    from utils.storage import init_session_state, get_session_state, set_session_state
except ImportError as e:
    st.error(f"Import Error: {e}")
    st.stop()


# Configure Streamlit page
st.set_page_config(
    page_title="Dashboard App",
    page_icon="📊",
    layout="wide",
    initial_sidebar_state="expanded",
    menu_items={
        'Get Help': 'https://www.streamlit.io/community',
        'Report a bug': None,
        'About': "# Dashboard App\nBuilt with Streamlit"
    }
)


def main():
    """
    Main application function
    """
    # Initialize session state
    init_session_state('current_page', 'dashboard')
    init_session_state('user_settings', {})
    init_session_state('app_initialized', False)
    
    # App initialization
    if not get_session_state('app_initialized'):
        initialize_app()
        set_session_state('app_initialized', True)
    
    # Create sidebar navigation
    create_sidebar()
    
    # Main content area
    current_page = get_session_state('current_page', 'dashboard')
    
    if current_page == 'dashboard':
        create_dashboard_page()
    else:
        st.error("Page not found!")


def initialize_app():
    """
    Initialize the application
    """
    # Create necessary directories
    os.makedirs('data', exist_ok=True)
    os.makedirs('cache', exist_ok=True)
    os.makedirs('logs', exist_ok=True)
    
    # Configure logging
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
        handlers=[
            logging.FileHandler('logs/app.log'),
            logging.StreamHandler()
        ]
    )
    
    logging.info("Application initialized successfully")


def create_sidebar():
    """
    Create sidebar navigation
    """
    with st.sidebar:
        st.title("🏠 Navigation")
        
        # Page navigation
        page_options = {
            'dashboard': '📊 Dashboard',
            # Add more pages here as needed
        }
        
        current_page = st.radio(
            "Select Page",
            options=list(page_options.keys()),
            format_func=lambda x: page_options[x],
            index=0
        )
        
        set_session_state('current_page', current_page)
        
        st.markdown("---")
        
        # App info
        st.subheader("ℹ️ App Info")
        st.info(f"**Version:** 1.0.0\n**Last Updated:** {datetime.now().strftime('%Y-%m-%d')}")
        
        # Settings
        st.subheader("⚙️ Settings")
        
        # Theme toggle (placeholder)
        theme = st.selectbox("Theme", ["Light", "Dark"], index=0)
        
        # Auto-refresh toggle
        auto_refresh = st.checkbox("Auto Refresh", value=False)
        if auto_refresh:
            refresh_interval = st.slider("Refresh Interval (seconds)", 30, 300, 60)
            st.session_state.refresh_interval = refresh_interval
        
        # Save settings
        user_settings = {
            'theme': theme,
            'auto_refresh': auto_refresh,
            'refresh_interval': st.session_state.get('refresh_interval', 60)
        }
        set_session_state('user_settings', user_settings)
        
        st.markdown("---")
        
        # Debug info (only show in development)
        if st.checkbox("Show Debug Info"):
            st.subheader("🐛 Debug Info")
            st.json({
                'Current Page': current_page,
                'Session State Keys': list(st.session_state.keys()),
                'User Settings': get_session_state('user_settings', {}),
                'App Initialized': get_session_state('app_initialized', False)
            })


@handle_data_exceptions
def handle_error_boundary():
    """
    Global error handler for the application
    """
    try:
        main()
    except Exception as e:
        log_error("Critical application error", e)
        st.error("A critical error occurred. Please refresh the page.")
        
        # Show error details in expander
        with st.expander("Error Details"):
            st.exception(e)


# Health check endpoint
def health_check():
    """
    Simple health check for the application
    """
    return {
        'status': 'healthy',
        'timestamp': datetime.now().isoformat(),
        'version': '1.0.0'
    }


if __name__ == "__main__":
    try:
        handle_error_boundary()
    except Exception as e:
        print(f"Fatal error: {e}")
        import traceback
        traceback.print_exc()