"""
Supply Roster Optimization Tool - Streamlit App
Simplified version with configuration and optimization results
"""

import streamlit as st
import sys
import os

# Add src directory to path for imports
sys.path.append(os.path.join(os.path.dirname(__file__), 'src'))

# Set page config
st.set_page_config(
    page_title="Supply Roster Optimization Tool",
    page_icon="📦",
    layout="wide",
    initial_sidebar_state="expanded"
)

# Sidebar navigation
st.sidebar.title("📦 Supply Roster Tool")
st.sidebar.markdown("---")

# Navigation
page = st.sidebar.selectbox(
    "Navigate to:",
    ["⚙️ Settings", "📊 Optimization Results", "📋 Demand Validation"],
    index=0
)

# Main app content
if page == "⚙️ Settings":
    # Import and render the config page
    from config_page import render_config_page
    
    st.title("📦 Supply Roster Optimization Tool")
    st.markdown("---")
    
    render_config_page()

elif page == "📊 Optimization Results":
    # Import and render the optimization results page
    from optimization_results import display_optimization_results
    
    # Check if we have results in session state
    if 'optimization_results' in st.session_state and st.session_state.optimization_results:
        
        display_optimization_results(st.session_state.optimization_results)
        
    else:
        st.title("📊 Optimization Results")
        st.info("🔄 No optimization results available yet.")
        st.markdown("Please run an optimization from the **⚙️ Settings** page first to see results here.")
        
        
        # Add helpful instructions
        st.markdown("### 📋 How to Get Results:")
        st.markdown("1. Go to **⚙️ Settings** page")
        st.markdown("2. Configure your optimization parameters")
        st.markdown("3. Click **🚀 Optimize Schedule**")
        st.markdown("4. Return here to view detailed results and input data inspection")

elif page == "📋 Demand Validation":
    # Import and render the demand validation page
    try:
        from src.demand_validation_viz import display_demand_validation
        
        st.title("📋 Demand Data Validation")
        st.markdown("---")
        
        display_demand_validation()
        
    except ImportError as e:
        st.error(f"❌ Error loading demand validation module: {str(e)}")
        st.info("💡 Please ensure the demand validation module is properly installed.")
    except Exception as e:
        st.error(f"❌ Error in demand validation: {str(e)}")
        st.info("💡 Please check the data files and configuration.")