package dev;

import dev.service.StudentManager;
import dev.thread.StudentLoader;
import dev.utils.FileManager;

import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(System.in);
        StudentManager manager = new StudentManager();

        while (true) {
            System.out.println("""
                    1.Load students
                    2.Search student
                    3.Remove student
                    4.Print students
                    5.Exit""");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1 -> {
                    List<String> data = FileManager.loadStudents("students.txt");

                    int size = data.size();
                    int part1Size = size / 3;
                    int part2Size = 2 * size / 3;

                    List<String> part1 = data.subList(0, part1Size);
                    List<String> part2 = data.subList(part1Size, part2Size);
                    List<String> part3 = data.subList(part2Size, size);

                    StudentLoader t1 = new StudentLoader(part1);
                    StudentLoader t2 = new StudentLoader(part2);
                    StudentLoader t3 = new StudentLoader(part3);

                    t1.start();
                    t2.start();
                    t3.start();

                    t1.join();
                    t2.join();
                    t3.join();

                    manager.addStudents(t1.getStudents());
                    manager.addStudents(t2.getStudents());
                    manager.addStudents(t3.getStudents());

                    System.out.println("Students loaded successfully.");
                }

                case 2 -> {
                    System.out.print("ID: ");
                    int id = scanner.nextInt();
                    System.out.println(manager.searchStudent(id));
                }

                case 3 -> {
                    System.out.print("ID: ");
                    int id = scanner.nextInt();
                    boolean removed = manager.removeStudent(id);
                    System.out.println(removed);
                }

                case 4 -> manager.printStudents();

                case 5 -> {
                    return;
                }
            }
        }
    }
}