import random
import datetime
import sys

class StudentManagementSystem:
    def __init__(self):
        self.students = []
        self.courses = []
        self.passed_courses = []

    def add_student(self):
        first_name = input("Enter the first name of the student: ")
        last_name = input("Enter the last name of the student: ")
        major = input("Select student's major (CE, EE, ET, ME, SE): ")

        if not first_name.isalpha() or not last_name.isalpha() or not first_name.istitle() or not last_name.istitle():
            print("Names should contain only letters and start with capital letters.")
            return

        current_year = datetime.datetime.now().year
        student_id = random.randint(10000, 99999)

        email = f"{first_name.lower()}.{last_name.lower()}@lut.fi"
        student_data = (student_id, first_name, last_name, current_year, major, email)
        self.students.append(student_data)

        with open("students.txt", "a") as file:
            file.write(','.join(map(str, student_data)) + 'n')

        print("Student added successfully!")

    def search_items(self, file_path, search_term, item_type):
        if len(search_term) < 3:
            print("Search term should contain at least 3 characters.")
            return

        with open(file_path, "r") as file:
            items = file.readlines()

        matching_items = [item for item in items if search_term in item]
        if matching_items:
            print(f"Matching {item_type}s:")
            for item in matching_items:
                item_info = item.strip().split(",")
                print(f"ID: {item_info[0]}, {item_type.capitalize()}: {item_info[1]}")
        else:
            print(f"No matching {item_type}s found.")

    def search_student(self):
        search_term = input("Give at least 3 characters of the student's first or last name: ")
        self.search_items("students.txt", search_term, "student")

    def search_course(self):
        search_term = input("Give at least 3 characters of the course name or teacher's name: ")
        self.search_items("courses.txt", search_term, "course")

    def add_course_completion(self):
        # Functionality for adding course completion
        pass

    def show_student_record(self):
        # Functionality for displaying student records
        pass

    def main_menu(self):
        print("You may select one of the following:")
        print("1) Add student")
        print("2) Search student")
        print("3) Search course")
        print("4) Add course completion")
        print("5) Show student's record")
        print("0) Exit")
        choice = input("What is your selection? ")

        if choice == "1":
            self.add_student()
        elif choice == "2":
            self.search_student()
        elif choice == "3":
            self.search_course()
        elif choice == "4":
            self.add_course_completion()
        elif choice == "5":
            self.show_student_record()
        elif choice == "0":
            print("Exiting the program.")
            sys.exit()
        else:
            print("Invalid input. Please select a valid option.")

if __name__ == "__main__":
    system = StudentManagementSystem&#40;&#41;
    while True:
        system.main_menu()