// CSE 143, Winter 2010, Marty Stepp
// This program hires and fires teaching assistants based on their experience.
// It demonstrates the PriorityQueue class.

import java.io.*;
import java.util.*;

public class FiringSquad {
    private static final int MIN_EXPERIENCE = 3;
    private static final String TAS_FILE = "tas.txt";
    private static final String REPLACEMENTS_FILE = "replacements.txt";

    public static void main(String[] args) throws IOException {
        // read TAs from file
        List<TA> taList = getTAsFromFile(TAS_FILE);
        System.out.println(taList);
        System.out.println();
        
        // load TAs into a priority queue
        Queue<TA> queue = new PriorityQueue<TA>();
        queue.addAll(taList);
        System.out.println(queue);
        
        // prompt for TAs to fire
        Scanner console = new Scanner(System.in);
        System.out.print("How many TAs to fire? ");
        int fire = console.nextInt();
        
        // fire the given number of TAs
        for (int i = 0; i < fire; i++) {
            queue.remove();
        }
                
        // Replace fired TAs with new ones from the replacements file
        List<TA> replacementList = getTAsFromFile(REPLACEMENTS_FILE);
        for (int i = 0; i < fire; i++) {
            queue.add(replacementList.get(i));
        }
        
        // print the remaining TAs in order of experience
        while (!queue.isEmpty()) {
            System.out.println(queue.remove());
        }
    }
    
    // Given a file name, attempts to read the names and experience levels of
    // TAs from that file. Each TAs data is inserted into a TA object, and the
    // lot are returned in a list.
    private static List<TA> getTAsFromFile(String filename) throws IOException {
        List<TA> list = new ArrayList<TA>();
        Scanner in = new Scanner(new File(filename));
        while (in.hasNext()) {
            String name = in.next();
            int exp = in.nextInt();
            TA ta = new TA(name, exp);
            list.add(ta);
        }
        return list;
    }
}