#!/usr/bin/env python3

import os
import sys
import subprocess

# It is assumed that the following scripts exist in the same directory:
# - manage_clients.py
# - track_time.py
# - create_invoice.py
# These modules will be run as separate processes.

def run_script_from_file(script_name):
    """
    Runs a Python script as a subprocess.

    Args:
        script_name (str): The name of the Python file to run.
    """
    # Check if the file exists
    if not os.path.exists(script_name):
        print(f"Error: The script '{script_name}' was not found.")
        print("Please ensure all required script files are in the same directory.")
        return

    try:
        # Run the script using subprocess.run
        # This will execute the script's top-level code (including any code in
        # its 'if __name__ == "__main__":' block).
        print(f"\n--- Running {script_name} ---")
        subprocess.run(['python3', script_name], check=True)
        print(f"--- {script_name} completed ---")
    except subprocess.CalledProcessError as e:
        print(f"An error occurred while trying to run '{script_name}': {e}")
    except Exception as e:
        print(f"An unexpected error occurred: {e}")

def main_menu():
    """
    Displays the main menu and handles user input to run different scripts.
    """
    while True:
        print("\n" + "="*40)
        print("  TIME TRACKER MAIN MENU")
        print("="*40)
        print("1. Manage Clients")
        print("2. Track Time")
        print("3. Create Invoice")
        print("4. Reports")
        print("0. Exit")  # Changed Exit option to 0
        print("="*40)
        
        choice = input("Enter your choice (1-3, or 0): ") # Updated prompt
        
        if choice == '1':
            run_script_from_file('manage_clients.py')
        elif choice == '2':
            run_script_from_file('track_time.py')
        elif choice == '3':
            run_script_from_file('create_invoice.py')
        elif choice == '4':
            run_script_from_file('reports.py')
        elif choice == '0': # Updated logic for the new exit choice
            print("Exiting the Time Tracker. Goodbye!")
            break
        else:
            print("Invalid choice. Please enter a number between 1 and 3, or 0 to exit.")

if __name__ == "__main__":
    main_menu()