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");

                    // TODO:

                    // Split data into 3 parts

                    int size = data.size();
                    int chunk = (size + 2) / 3;

                    List<String> part1 = data.subList(0, Math.min(chunk, size));

                    List<String> part2 = data.subList(Math.min(chunk, size), Math.min(2 * chunk, size));

                    List<String> part3 = data.subList(Math.min(2 * chunk, size), size);

                    // TODO:

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

                    // TODO:
                    t1.start();
                    t2.start();
                    t3.start();

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

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

                }

                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;
                }

            }

        }

    }

}