import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Scanner;


public class Application {

	public static void main(String[] args) {
		try (
			BufferedReader reader = new BufferedReader ( new FileReader("people.txt")))
		{
			String line = reader.readLine();
			Scanner scan = null;
			String surname = null;
			String firstName = null;
			double salary = 0.0;
			List<Person> list = new ArrayList<>();

			while(line != null)
			{
				scan = new Scanner(line);
				surname = scan.next();
				firstName = scan.next();
				salary = scan.nextDouble();
				list.add(new Person(surname, firstName,salary));
				line = reader.readLine();
			}

			System.out.println("Original persons list:");
			System.out.println("Surname  \tFirstName\tSalary");
			for(int i = 0; i< list.size();i++)
			{
				System.out.print(list.get(i).getSurname() + "   " + "\t" + list.get(i).getFirstName() + "\t\t" + list.get(i).getSalary() + "\n");
			}

			System.out.println("\n"+"Enter whether you would like the list sorted by 'Name' or 'Salary'");
			Scanner scan1 = new Scanner(System.in);
			String option = scan1.next().toLowerCase();

			if(option.equals("name"))
			{
			Collections.sort(list);						//sorts by name
			System.out.println("\n" + "Sorted by surname then by first name:");
			}

			else if(option.equals("salary"))
			{
			Collections.sort(list, new PersonComparator()); //sorts by salary
			System.out.println("\n" + "Sorted by salary:");
			}

			else
			{
				System.out.println("Invalid option");
				System.exit(0);
			}

			System.out.println("Surname  \tFirstName\tSalary");
			for(int i = 0; i< list.size();i++)
			{
				System.out.print(list.get(i).getSurname() + "   " + "\t" + list.get(i).getFirstName() + "\t\t" + list.get(i).getSalary());
				System.out.println();
			}
			scan1.close();
		}

		catch(FileNotFoundException e)
		{
			System.out.println(e);
		}
		catch(IOException e)
		{
			System.out.println(e);
		}
		catch(NoSuchElementException e)
		{
			System.out.println("One of the lines in the text file doesn't have all the required fields");
		}
	}

}