#!/usr/bin/env python3
"""
Dev LMS Startup Script
======================

This script provides an easy way to start the Dev LMS application.
It handles dependency checking and provides helpful information.
"""

import subprocess
import sys
import os

def check_dependencies():
    """Check if required dependencies are installed"""
    required_packages = [
        'streamlit',
        'streamlit_authenticator',
        'PyPDF2',
        'yaml',
        'bcrypt'
    ]
    
    missing_packages = []
    
    for package in required_packages:
        try:
            __import__(package.replace('-', '_'))
        except ImportError:
            missing_packages.append(package)
    
    return missing_packages

def install_dependencies():
    """Install missing dependencies"""
    print("Installing missing dependencies...")
    try:
        subprocess.check_call([sys.executable, '-m', 'pip', 'install', '-r', 'requirements.txt'])
        print("✅ Dependencies installed successfully!")
        return True
    except subprocess.CalledProcessError:
        print("❌ Failed to install dependencies. Please install them manually:")
        print("   pip install -r requirements.txt")
        return False

def main():
    print("🚀 Dev LMS - Learning Management System")
    print("=" * 50)
    
    # Check if we're in the right directory
    if not os.path.exists('src/streamlit_app.py'):
        print("❌ Error: Please run this script from the project root directory")
        print("   (where src/streamlit_app.py is located)")
        sys.exit(1)
    
    # Check dependencies
    print("🔍 Checking dependencies...")
    missing = check_dependencies()
    
    if missing:
        print(f"❌ Missing dependencies: {', '.join(missing)}")
        response = input("Would you like to install them now? (y/n): ")
        if response.lower() in ['y', 'yes']:
            if not install_dependencies():
                sys.exit(1)
        else:
            print("Please install dependencies manually and try again.")
            sys.exit(1)
    else:
        print("✅ All dependencies are installed!")
    
    print("\n🎯 Starting Dev LMS...")
    print("📖 Default login credentials:")
    print("   - Admin: admin / admin123")
    print("   - Teacher: teacher / teacher123")
    print("   - Student: student / student123")
    print("\n🌐 The application will open in your browser at: http://localhost:8501")
    print("⏹️  Press Ctrl+C to stop the application")
    print("=" * 50)
    
    try:
        # Start the Streamlit app
        subprocess.run([
            sys.executable, '-m', 'streamlit', 'run', 
            'src/streamlit_app.py',
            '--server.port=8501',
            '--server.headless=true'
        ])
    except KeyboardInterrupt:
        print("\n👋 Dev LMS stopped. Goodbye!")
    except Exception as e:
        print(f"❌ Error starting application: {e}")
        sys.exit(1)

if __name__ == "__main__":
    main()